CN111525827A - Energy routing system - Google Patents
- ️Tue Aug 11 2020
CN111525827A - Energy routing system - Google Patents
Energy routing system Download PDFInfo
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Publication number
- CN111525827A CN111525827A CN202010298821.3A CN202010298821A CN111525827A CN 111525827 A CN111525827 A CN 111525827A CN 202010298821 A CN202010298821 A CN 202010298821A CN 111525827 A CN111525827 A CN 111525827A Authority
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- China Prior art keywords
- converter
- current
- voltage
- controller
- direct Prior art date
- 2020-04-16 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/66—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal
- H02M7/68—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters
- H02M7/72—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Dc-Dc Converters (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides an energy routing system, comprising: the alternating current end of the alternating current bidirectional converter is used for being connected with an alternating current source, an alternating current load or a direct current source; the first direct current end of the direct current bidirectional converter is connected with the direct current end of the alternating current bidirectional converter, the second direct current end of the direct current bidirectional converter is used for connecting a high-voltage battery, and the third direct current end of the direct current bidirectional converter is used for connecting a low-voltage direct current load; a first controller; a second controller; the first controller is used for controlling the alternating current bidirectional converter, and the second controller is used for controlling the direct current bidirectional converter so as to discharge the high-voltage battery to the low-voltage direct current load, the alternating current source or the alternating current load, or charge the high-voltage battery by the alternating current source or the direct current source. The system realizes the multidirectional flow of energy by respectively controlling the alternating current bidirectional converter and the direct current bidirectional converter, and meets the requirement of energy intercommunication.
Description
Technical Field
The invention relates to the technical field of energy, in particular to an energy routing system.
Background
In recent years, on one hand, with the severe requirement on the emission of CO2, new energy sources such as photovoltaic and wind power, which are green clean energy, have been rapidly developed, and the generation of a photovoltaic energy system is further promoted, and the photovoltaic energy system generally needs energy storage and inversion grid-connected feedback. On the other hand, with the further development of the electric vehicle technology, the vehicle charging technology is more and more popular, and further the requirements for the vehicle charging requirements are more and more diversified.
Therefore, how to provide an energy routing system that can satisfy both green clean energy and vehicle-mounted charging technology to realize energy intercommunication and multidirectional flow of energy is a problem that needs to be solved in the current energy technology field.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the invention aims to provide an energy routing system to realize the multi-directional flow of energy and meet the requirement of energy intercommunication by respectively controlling an alternating current bidirectional converter and a direct current bidirectional converter.
To achieve the above object, an embodiment of the present invention provides an energy routing system, including: the alternating current bidirectional converter is characterized in that an alternating current end of the alternating current bidirectional converter is used for being connected with an alternating current source, an alternating current load or a direct current source; the first direct current end of the direct current bidirectional converter is connected with the direct current end of the alternating current bidirectional converter, the second direct current end of the direct current bidirectional converter is used for connecting a high-voltage battery, and the third direct current end of the direct current bidirectional converter is used for connecting a low-voltage direct current load; the first controller is connected with the control end of the alternating current bidirectional converter; the second controller is connected with the control end of the direct current bidirectional converter, and is also respectively in communication connection with the first controller and the manager of the high-voltage battery;
the first controller is configured to control the ac bidirectional converter, and the second controller is configured to control the dc bidirectional converter, so as to discharge the high-voltage battery to the low-voltage dc load, the ac source, or the ac load, or charge the high-voltage battery to the ac source or the dc source.
According to the energy routing system provided by the embodiment of the invention, the alternating current bidirectional converter is controlled by the first controller, and the direct current bidirectional converter is controlled by the second controller, so that the high-voltage battery is discharged to the low-voltage direct current load, or the high-voltage battery is discharged to the alternating current source, or the high-voltage battery is discharged to the alternating current load, or the alternating current source charges the high-voltage battery, or the direct current source charges the high-voltage battery. Therefore, the energy can flow in multiple directions by respectively controlling the alternating current bidirectional converter and the direct current bidirectional converter, and the requirement of energy intercommunication is met.
In addition, the energy routing system according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the dc bi-directional converter includes: a transformer including a primary coil, a first secondary coil, and a second secondary coil; a first DC/AC converter, wherein a DC end of the first DC/AC converter is connected with a DC end of the alternating current bidirectional converter, an AC end of the first DC/AC converter is connected with the primary coil, and a control end of the first DC/AC converter is connected with the second controller; a second DC/AC converter, a DC terminal of which is used for connecting the high-voltage battery, an AC terminal of which is connected to the first secondary coil, and a control terminal of which is connected to the second controller; and the direct current end of the third DC/AC converter is used for connecting the low-voltage direct current load, the alternating current end of the third DC/AC converter is connected with the second secondary coil, and the control end of the third DC/AC converter is connected with the second controller.
According to an embodiment of the present invention, a first port of the AC terminals of the first DC/AC converter is connected to one terminal of the primary winding, and a first port of the AC terminals of the third DC/AC converter is connected to one terminal of the second secondary winding, the DC bi-directional converter further includes: and a first single-pole double-throw switch, a stationary contact of which is connected with the second port of the alternating current terminal of the first AC/DC converter and the second port of the alternating current terminal of the third DC/AC converter, respectively, a first movable contact of which is connected with the other end of the primary coil, a second movable contact of which is connected with the other end of the second secondary coil, and a control terminal of which is connected with the second controller.
According to one embodiment of the invention, the ac source comprises a single-phase ac grid and a three-phase ac grid, the bidirectional ac converter comprising: a fourth DC/AC converter having an AC terminal for connecting the AC source or the AC load, and a DC terminal connected to the DC terminal of the first DC/AC converter, wherein the AC terminal of the fourth DC/AC converter includes a first phase port, a second phase port, and a third phase port; a first controllable switch connected between the first phase port and the second phase port, a control terminal of the first controllable switch being connected to the first controller.
According to an embodiment of the invention, the bidirectional ac converter further comprises: a second single-pole double-throw switch, a fixed contact of which is connected with a first port of the direct-current end of the first DC/AC converter, a first movable contact of which is connected with a first port of the direct-current end of the fourth DC/AC converter, a second movable contact of which is used for connecting a positive terminal of a direct-current energy storage device, and a control terminal of which is connected with the first controller, wherein a second port of the direct-current end of the fourth DC/AC converter is connected with a second port of the direct-current end of the first DC/AC converter and used for connecting a negative terminal of the direct-current energy storage device; the first controller is further configured to control the first DC/AC converter, and the second controller is further configured to control the second DC/AC converter, so as to charge the high-voltage battery with the DC energy storage device.
According to an embodiment of the present invention, each of the first DC/AC converter and the second DC/AC converter employs an H-bridge inverter, the fourth DC/AC converter includes a first phase bridge arm, a second phase bridge arm, and a third phase bridge arm, the first phase bridge arm, the second phase bridge arm, and the third phase bridge arm are connected in parallel to form a first bus terminal and a second bus terminal, the first bus terminal is connected to the first movable contact of the second single-pole double-throw switch, the second bus terminal is grounded, a midpoint of the first phase bridge arm is connected to one end of the first controllable switch, a midpoint of the second phase bridge arm is connected to the other end of the first controllable switch, and a midpoint of the third phase bridge arm serves as the third phase port.
According to one embodiment of the invention, the third DC/AC converter comprises: a first end of the first switch tube is connected with one end of the second secondary coil, and a control end of the first switch tube is connected with the second controller; a second switch tube, a first end of the second switch tube is connected with a stationary contact of the first single-pole double-throw switch, a second end of the second switch tube is connected with a second end of the first switch tube and is used for connecting a negative pole end of the low-voltage direct-current load, and a control end of the second switch tube is connected with the second controller; one end of the first inductor is connected with one end of the second secondary coil, and the other end of the first inductor is used for being connected with the positive electrode end of the low-voltage direct-current load; and one end of the second inductor is connected with the stationary contact of the first single-pole double-throw switch, and the other end of the second inductor is connected with the other end of the first inductor.
According to one embodiment of the invention, when it is determined that the three-phase ac power grid is required to charge the high-voltage battery, the first controller controls the first controllable switch to be in an off state, and controls the static contact of the second single-pole double-throw switch to be connected with the first movable contact, the second controller controls the static contact of the first single-pole double-throw switch to be connected with the first movable contact, and the first controller controls the fourth DC/AC converter according to the voltage of the DC end of the second DC/AC converter and the voltage and the current of the AC end of the fourth DC/AC converter, the second controller respectively controls the first DC/AC converter and the second DC/AC converter according to the voltage and the current of the direct-current end of the second DC/AC converter so as to charge the high-voltage battery by the three-phase alternating-current power grid;
when the single-phase alternating current power grid or the direct current source is required to charge the high-voltage battery, the first controller controls the first controllable switch to be in a closed state, and controls the static contact of the second single-pole double-throw switch to be connected with the first movable contact, the second controller controls the static contact of the first single-pole double-throw switch to be connected with the first movable contact, and the first controller controls the fourth DC/AC converter according to the voltage of the DC end of the second DC/AC converter and the voltage and the current of the AC end of the fourth DC/AC converter, the second controller controls the first DC/AC converter and the second DC/AC converter according to the voltage and the current of the direct-current end of the second DC/AC converter respectively so as to charge the high-voltage battery by the single-phase alternating-current power grid or the direct-current source;
when it is determined that the direct-current energy storage device is required to charge the high-voltage battery, the first controller controls the first controllable switch to be in a closed state and controls the fixed contact of the second single-pole double-throw switch to be connected with the second movable contact, the second controller controls the fixed contact of the first single-pole double-throw switch to be connected with the first movable contact, the first controller controls the first DC/AC converter according to the voltage and the current of the direct-current end of the second DC/AC converter, and the second controller controls the second DC/AC converter according to the voltage and the current of the direct-current end of the second DC/AC converter, so that the direct-current energy storage device charges the high-voltage battery.
According to an embodiment of the present invention, when it is determined that the high voltage battery needs to be discharged to the single-phase AC power grid or the AC load, the first controller controls the first controllable switch to be in a closed state and controls the fixed contact of the second single-pole double-throw switch to be connected to the first movable contact, the second controller controls the fixed contact of the first single-pole double-throw switch to be connected to the first movable contact, and the first controller controls the fourth DC/AC converter according to the voltage of the DC terminal of the second DC/AC converter and the voltage and current of the AC terminal of the fourth DC/AC converter, and the second controller controls the first DC/AC converter and the second DC/AC converter according to the voltage and current of the DC terminal of the second DC/AC converter, to achieve discharge of the high voltage battery to the single phase ac grid or the ac load;
when it is determined that the high-voltage battery needs to discharge to the direct-current energy storage device, the first controller controls the first controllable switch to be in a closed state and controls the fixed contact of the second single-pole double-throw switch to be connected with the second movable contact, the second controller controls the fixed contact of the first single-pole double-throw switch to be connected with the first movable contact, the first controller controls the first DC/AC converter according to the voltage and the current of the direct-current end of the second DC/AC converter, and the second controller controls the second DC/AC converter according to the voltage and the current of the direct-current end of the second DC/AC converter, so that the high-voltage battery discharges to the direct-current energy storage device;
when it is determined that the high-voltage battery needs to discharge to the low-voltage direct-current load, the first controller controls the first controllable switch to be in a disconnected state and controls the fixed contact of the second single-pole double-throw switch to be connected with the first movable contact, the second controller controls the fixed contact of the first single-pole double-throw switch to be connected with the second movable contact, and the second controller controls the second DC/AC converter and the third DC/AC converter according to the voltage and the current of the direct-current end of the second DC/AC converter respectively so as to realize that the high-voltage battery discharges to the low-voltage direct-current load.
According to one embodiment of the invention, the voltage value of the high-voltage battery is 200-500V, the rated voltage of the low-voltage direct-current load is 12V/27V, the first controller and the second controller are in communication connection through an RS485 communication line, and the second controller and a manager of the high-voltage battery are connected through a CAN bus.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block schematic diagram of an energy routing system of an embodiment of the present invention;
FIG. 2 is a schematic diagram of an exemplary energy routing system of the present invention;
FIG. 3 is a schematic block diagram of another exemplary energy routing system of the present invention;
FIG. 4 is a schematic diagram of a system configuration for charging a high voltage battery from a three phase AC power grid in accordance with an exemplary embodiment of the present invention;
FIG. 5 is a schematic diagram of a system configuration for charging a high voltage battery from a single phase AC power grid or DC source, or discharging a high voltage battery from a single phase AC power grid or AC load, in accordance with an exemplary embodiment of the present invention;
FIG. 6 is a schematic diagram of a system configuration in which a DC energy storage device charges a high voltage battery or the high voltage battery discharges the DC energy storage device in accordance with an exemplary embodiment of the present invention;
FIG. 7 is a flow chart of an exemplary energy routing system of the present invention in a forward charging mode;
FIG. 8 is a schematic diagram of a charge mode algorithm according to an example of the present invention;
FIG. 9 is a schematic diagram of a system configuration for discharging a high voltage battery to a low voltage DC load in accordance with an exemplary embodiment of the present invention;
FIG. 10 is a flow chart of an exemplary energy routing system of the present invention in a reverse discharge mode;
FIG. 11 is a schematic diagram of a discharge mode algorithm according to an example of the present invention;
fig. 12 is a schematic diagram of an energy device connected to an energy routing system according to a specific example of the present invention;
fig. 13 is a schematic diagram of energy multidirectional flow for one particular example of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An energy routing system of an embodiment of the present invention is described below with reference to the drawings.
Fig. 1 is a block schematic diagram of an energy routing system of an embodiment of the present invention.
As shown in fig. 1, the energy routing system 100 includes: the controller comprises an alternating current
bidirectional converter10, a direct current
bidirectional converter20, a
first controller30 and a
second controller40.
The alternating-current end of the alternating-current
bidirectional converter10 is used for connecting an alternating-
current source1, an alternating-
current load2 or a direct-current source 3; a first direct current end of the direct current
bidirectional converter20 is connected with a direct current end of the alternating current
bidirectional converter10, a second direct current end of the direct current
bidirectional converter20 is used for connecting the high-voltage battery 4, and a third direct current end of the direct current bidirectional converter is used for connecting the low-voltage
direct current load5; the
first controller30 is connected with the control end of the alternating current
bidirectional converter10; the
second controller40 is connected with the control end of the direct current
bidirectional converter20, and the
second controller40 is also respectively connected with the
first controller30 and the manager of the high-voltage battery 4 in a communication way; the
first controller30 is configured to control the ac
bidirectional converter10, and the
second controller40 is configured to control the dc
bidirectional converter20, so as to discharge the high-voltage battery 4 to the low-
voltage dc load5, the
ac source1, or the
ac load2, or charge the high-voltage battery 4 from the
ac source1 or the dc source 3.
In one embodiment, the voltage value of the high-voltage battery 4 may be 200-500V, the rated voltage of the low-
voltage dc load5 may be 12V/27V, the
first Controller30 and the
second Controller40 may be connected by an RS485 communication line, and the
second Controller40 and the manager of the high-voltage battery 4 are connected by a CAN (Controller Area Network) bus.
Specifically, in practical applications, when the high-voltage battery 4 is required to discharge to the low-
voltage dc load5 through the energy routing system 100, and the
second controller40 detects that the electric quantity of the high-voltage battery 4 is sufficient through the manager, the
second controller40 may control the dc
bidirectional converter20 to convert the high-voltage dc output by the high-voltage battery 4 into low-voltage dc and output the low-voltage dc to the low-
voltage dc load5, so as to discharge the high-voltage battery 4 to the low-
voltage dc load5; when it is required to discharge the high-voltage battery 4 to the
ac source1 or the
ac load2 through the energy routing system 100, and the
second controller40 detects that the electric quantity of the high-voltage battery 4 is sufficient through the manager, the
second controller40 may control the dc
bidirectional converter20 to convert the high-voltage dc output by the high-voltage battery 4 into low-voltage dc and output the low-voltage dc to the ac
bidirectional converter10, so that the
first controller20 controls the ac
bidirectional converter10 to convert the dc into ac and output the ac to the ac source 1 (e.g., a three-phase ac power grid, a single-phase ac power grid) or the ac load 2 (e.g., a household appliance) to discharge the high-voltage battery 4 to the
ac source1 or the
ac load2.
When the
ac source1 needs to charge the high-voltage battery 4 through the energy routing system 100, for example, the
second controller40 detects that the electric quantity of the high-voltage battery 4 is low through the manager, and needs to charge in time, the
second controller40 may send a charging instruction to the
first controller30, so that the
first controller30 controls the ac
bidirectional converter10 to convert the ac output by the
ac source1 into dc and output the dc to the dc
bidirectional converter20, so that the dc
bidirectional converter20 performs conversion (for example, boosting) between the dc and outputs the dc to the high-voltage battery 4, so as to charge the high-voltage battery 4 through the
ac source1; when the direct current source 3 is required to charge the high-voltage battery 4 through the energy routing system 100, the
first controller30 controls the alternating current
bidirectional converter10 to convert the direct current output by the direct current source 3 (e.g., photovoltaic, wind power) into alternating current, and output the alternating current to the direct current
bidirectional converter20, so that the direct current
bidirectional converter20 converts the alternating current into direct current and outputs the direct current to the high-voltage battery 4, thereby charging the high-voltage battery 4 by the direct current source 3.
It is understood that, during the charging and discharging process of the high voltage battery 4, the manager of the high voltage battery 4 may monitor the operating state of the high voltage battery 4 in real time and send the operating state to the
second controller40, so as to prevent the high voltage battery 4 from being damaged by excessive charging and discharging.
Therefore, the energy routing system of the embodiment of the invention realizes the multi-directional flow of energy by respectively controlling the alternating current bidirectional converter and the direct current bidirectional converter, and meets the requirement of energy intercommunication.
In one embodiment of the present invention, as shown in fig. 2, the
dc bi-directional converter20 includes: a
transformer21, a first DC/
AC converter22, a second DC/
AC converter23 and a third DC/
AC converter24.
Wherein the
transformer21 includes a primary coil W0, a first secondary coil W1, and a second secondary coil W2; the direct current end of the first DC/
AC converter22 is connected to the direct current end of the alternating current
bidirectional converter10, the alternating current end of the first DC/
AC converter22 is connected to the primary winding W0, and the control end of the first DC/
AC converter22 is connected to the
second controller40; the direct current end of the second DC/
AC converter23 is used for connecting the high-voltage battery 4, the alternating current end of the second DC/
AC converter23 is connected with the first secondary coil W1, and the control end of the second DC/
AC converter23 is connected with the
second controller40; the DC terminal of the third DC/
AC converter24 is used for connecting the low-
voltage DC load5, the AC terminal of the third DC/
AC converter24 is connected to the second secondary winding W2, and the control terminal of the third DC/
AC converter24 is connected to the
second controller40.
It can be understood that, in this embodiment, referring to fig. 2, the first DC/
AC converter22 may include a third switching tube Q3, a fourth switching tube Q4, a fifth switching tube Q5 and a sixth switching tube Q6, wherein a control terminal G3, G4, G5 and G6 of each switching tube are respectively connected to the
second controller40, so that the
second controller40 controls the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5 and the sixth switching tube Q6, thereby controlling the first DC/
AC converter22 by the
second controller40; the second DC/
AC converter23 may include a seventh switch Q7, an eighth switch Q8, a ninth switch Q9 and a tenth switch Q10, wherein each switch has a corresponding control terminal G7, G8, G9 and G10 respectively connected to the
second controller40, so that the
second controller40 controls the seventh switch Q7, the eighth switch Q8, the ninth switch Q9 and the tenth switch Q10, thereby controlling the second DC/
AC converter23 by the
second controller40.
In one example, referring to fig. 2, the first port of the AC terminal of the first DC/
AC converter22 is connected to one terminal of the primary winding W0, and the first port of the AC terminal of the third DC/
AC converter24 is connected to one terminal of the second secondary winding W2, and the
DC bi-directional converter20 may further include: a first single pole double
throw switch SW1. The stationary contacts of the first single-pole double-throw switch SW1 are connected to the second port of the AC terminal of the first AC/
DC converter22 and the second port of the AC terminal of the third DC/
AC converter24, respectively, the first movable contact of the first single-pole double-throw switch SW1 is connected to the other end of the primary winding W0, the second movable contact of the first single-pole double-throw switch SW1 is connected to the other end of the second secondary winding W2, and the control terminal of the first single-pole double-throw switch SW1 is connected to the second controller 40 (not shown in the figure).
Further, with reference to fig. 2, the
ac source1 may comprise a single-phase ac grid and a three-phase ac grid, and the
bidirectional ac converter10 may comprise: a fourth DC/
AC converter11 and a first controllable switch K1.
The alternating current end of the fourth DC/
AC converter11 is used for connecting the
alternating current source1 or the
alternating current load2, and the direct current end of the fourth DC/
AC converter11 is connected with the direct current end of the first DC/
AC converter22, where the alternating current end of the fourth DC/
AC converter11 includes a first phase port a, a second phase port B, and a third phase port C; the first controllable switch K1 is connected between the first phase port a and the second phase port B, and the control terminal of the first controllable switch K1 is connected to the first controller 30 (not shown in the figure).
It can be understood that, referring to fig. 2, the fourth DC/
AC converter11 includes an eleventh switching tube Q11, a twelfth switching tube Q12, a thirteenth switching tube Q13, a fourteenth switching tube Q14, a fifteenth switching tube Q15 and a sixteenth switching tube Q16, wherein a control terminal G11, G12, G13, G14, G15 and G16 corresponding to each switching tube are respectively connected to the
first controller30, so that the
first controller30 respectively controls each control terminal, thereby implementing control over the fourth DC/
AC converter11.
Further, referring to fig. 2, the
bidirectional ac converter10 may further include: a second single pole double
throw switch SW2. A fixed contact of the second single-pole double-throw switch SW2 is connected with a first port of the direct-current end of the first DC/
AC converter22, a first movable contact of the second single-pole double-throw switch SW2 is connected with a first port of the direct-current end of the fourth DC/
AC converter11, a second movable contact of the second single-pole double-throw switch SW2 is used for connecting with a positive end of the direct-current
energy storage device6, and a control end of the second single-pole double-throw switch SW2 is connected with the first controller 30 (not shown in the figure), wherein a second port of the direct-current end of the fourth DC/
AC converter11 is connected with a second port of the direct-current end of the first DC/
AC converter22 and is used for connecting with a negative end of the direct-current
energy storage device6; the
first controller30 is further configured to control the first DC/
AC converter22, and the
second controller40 is further configured to control the second DC/
AC converter23, so as to charge the high-voltage battery 4 with the DC
energy storage device6.
In an example of the present invention, referring to fig. 2, each of the first DC/
AC converter22 and the second DC/
AC converter23 employs an H-bridge inverter, the fourth DC/
AC converter11 includes a first phase arm, a second phase arm, and a third phase arm, the first phase arm, the second phase arm, and the third phase arm are connected in parallel to form a first bus terminal and a second bus terminal, the first bus terminal is connected to the first movable contact of the second single-pole double-throw switch SW2, the second bus terminal is grounded GND, a midpoint of the first phase arm is connected to one end of the first controllable switch K1, a midpoint of the second phase arm is connected to the other end of the first controllable switch K1, and a midpoint of the third phase arm serves as a third phase port C.
It is understood that the first bus terminal of the embodiment can be the first port of the DC terminal of the fourth DC/
AC converter11, and the second bus terminal can be the second port of the DC terminal of the fourth DC/
AC converter11.
In one example of the present invention, referring to fig. 2, the third DC/
AC converter24 may include: a first switch tube Q1, a second switch tube Q2, a first inductor L1 and a second inductor L2
A first end of the first switch tube Q1 is connected with one end of the second secondary winding W2, and a control end G1 of the first switch tube Q1 is connected with the
second controller40; a first end of a second switching tube Q2 is connected with a stationary contact of the first single-pole double-throw switch SW1, a second end of a second switching tube Q2 is connected with a second end of the first switching tube Q1 and is used for connecting a negative pole end of the low-voltage direct-
current load5, and a control end G2 of the second switching tube Q2 is connected with the
second controller40; one end of the first inductor L1 is connected to one end of the second secondary winding W2, and the other end of the first inductor L1 is used for connecting the positive terminal of the low-
voltage dc load5; one end of the second inductor L2 is connected to the stationary contact of the first single-pole double-throw switch SW1, and the other end of the second inductor L2 is connected to the other end of the first inductor L1.
It can be understood that, referring to fig. 2, the control terminal G1 of the first switch tube Q1 and the control terminal G2 of the second switch tube Q2 are respectively connected to the
second controller40, so that the
second controller40 controls the third DC/
AC converter24 through controlling the control terminals G1 and G2. The first to sixteenth switching tubes Q1 to Q16 may be MOS (Metal oxide semiconductor Field Effect transistors), and the first end thereof may be a source or a drain, and the second end thereof may be a drain or a source.
Optionally, as shown in fig. 3, the energy routing system 100 may further include a third inductor L3, a fourth inductor L4, a fifth inductor L5, a first capacitor C1, a second capacitor C2, and a third capacitor C3, which are connected as shown in the figure, wherein the first capacitor C1, the second capacitor C2, and the third capacitor C3 respectively protect the dc
energy storage device6, the high-voltage battery 4, and the low-
voltage dc load5, so as to avoid damage to the high-voltage battery 4 when the high-voltage battery is instantaneously charged and discharged.
The control principle of charging the high-voltage battery 4 by the energy routing system 100 in this example is described below in conjunction with fig. 4-8.
In one example of the present invention, as shown in fig. 4, when it is determined that the three-phase ac grid is required to charge the high-voltage battery 4, the
first controller30 controls the first controllable switch K1 to be in the open state, and controls the stationary contact of the second single pole double throw switch SW1 to be connected with the first movable contact, the
second controller40 controls the stationary contact of the first single pole double throw switch SW1 to be connected with the first movable contact, and the
first controller30 controls the fourth DC/
AC converter11 according to the voltage at the DC terminal of the second DC/
AC converter23 and the voltage and current at the AC terminal of the fourth DC/
AC converter11, and the
second controller40 controls the first DC/
AC converter22 and the second DC/
AC converter23 according to the voltage and current at the DC terminal of the second DC/
AC converter23, respectively, so as to charge the high-voltage battery 4 through the three-phase AC power grid.
Specifically, three-phase alternating current output from the three-phase alternating current grid is input to the fourth DC/
AC converter11 through the first phase port a, the second phase port B, and the third phase port C, the
first controller30 controls the fourth DC/
AC converter11 to convert the three-phase alternating current into direct current, and then the
second controller40 controls the first DC/
AC converter22 to convert the direct current into alternating current, which is subjected to the boosting process by the
transformer21 and then outputs high-voltage alternating current to the second DC/
AC converter23, so that the second DC/
AC converter23 converts the high-voltage alternating current into high-voltage direct current to charge the high-voltage battery 4, thereby charging the high-voltage battery 4 from the three-phase alternating current grid (which may be abbreviated as G2V). At this time, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 are primary side main switch tubes of the
transformer21, and the second controller controls the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 through PFM (Pulse frequency modulation) or Burst (Pulse) technology; the seventh switch tube Q7, the eighth switch tube Q8, the ninth switch tube Q9 and the tenth switch tube Q10 may all be used as Synchronous Rectification (SR).
It should be appreciated that when the first controllable switch K1 is in the open state, the energy routing system 100 may operate in the three-phase rectification mode, and the
first controller30 may perform three-phase space vector control on the fourth DC/
AC converter11.
When it is determined that the single-phase ac grid or the dc source 3 is required to charge the high-voltage battery 4, as shown in fig. 5, the
first controller30 controls the first controllable switch K1 to be in a closed state, and controls the stationary contact of the second single pole double throw switch SW2 to be connected with the first movable contact, the
second controller40 controls the stationary contact of the first single pole double throw switch SW1 to be connected with the first movable contact, and the
first controller30 controls the fourth DC/
AC converter11 according to the voltage at the DC terminal of the second DC/
AC converter23 and the voltage and current at the AC terminal of the fourth DC/
AC converter11, and the
second controller40 controls the first DC/
AC converter22 and the second DC/
AC converter23 according to the voltage and current at the DC terminal of the second DC/
AC converter23, respectively, so as to charge the high-voltage battery 4 with the single-phase AC power grid or the DC source 3.
Specifically, as for the charging of the high-voltage battery 4 by the single-phase ac power grid (may be abbreviated as G2V), the charging process is similar to that of the three-phase ac power grid, and therefore, the description thereof is omitted; in the case where the DC source 3 charges the high-voltage battery 4 through the energy routing system 100, the first controller 30 may control the fourth DC/AC converter 11 in two ways, that is, the energy routing system 100 has two control ways: firstly, the first controller 30 controls the eleventh switch tube Q11, the twelfth switch tube Q12, the fifteenth switch tube Q15 to be constantly turned off, and the sixteenth switch tube Q16 to be constantly turned on, so as to control the thirteenth switch tube Q13 and the fourteenth switch tube Q14 to convert the direct current output by the direct current source 3 into alternating current; secondly, the first controller 30 controls the thirteenth switching tube Q13, the fourteenth switching tube Q14, the fifteenth switching tube Q15 to be constantly turned off, and the sixteenth switching tube Q16 to be constantly turned on, so as to control the eleventh switching tube Q11 and the twelfth switching tube Q12 to convert the direct current output by the direct current source 3 into a direct current, the direct current is converted into an alternating current by the first DC/AC converter 22, the alternating current is subjected to a boosting process by the transformer 21, and then a high-voltage alternating current is output to the second DC/AC converter 23, so that the second DC/AC converter 23 converts the high-voltage alternating current into a high-voltage direct current and charges the high-voltage battery 4, thereby realizing that the direct current source 3 charges the high-voltage battery 4 (which may be abbreviated as S2V).
The third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 are primary side main switch tubes of the
transformer21, and the
second controller40 can control the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 through PFM (Pulse frequency modulation) or Burst (Pulse) technology; the functions of the seventh switch tube Q7, the eighth switch tube Q8, the ninth switch tube Q9 and the tenth switch tube Q10 may be synchronous rectification.
Therefore, when the first controllable switch K1 is in the closed state, the energy routing system 100 operates in the interleaved totem pole boost mode, and can support single-phase ac input and dc source 3 input.
As shown in fig. 6, when it is determined that the direct current
energy storage device6 is required to charge the high voltage battery 4, the
first controller30 controls the first controllable switch K1 to be in a closed state and controls the fixed contact of the second single-pole double-throw switch SW2 to be connected with the second movable contact, the
second controller40 controls the fixed contact of the first single-pole double-throw switch SW1 to be connected with the first movable contact, the
first controller30 controls the first DC/
AC converter22 according to the voltage and current of the direct current end of the second DC/
AC converter23, and the
second controller40 controls the second DC/
AC converter23 according to the voltage and current of the direct current end of the second DC/
AC converter23, so as to charge the direct current
energy storage device6 to the high voltage battery. Referring to fig. 6, the structure of the energy routing system 100 may now be a CLLLC resonant topology.
Specifically, the low-voltage direct current output by the direct-current
energy storage device6 is converted into a low-voltage alternating current by the first DC/
AC converter22, the low-voltage alternating current is converted into a high-voltage alternating current after being boosted by the
transformer21, the high-voltage alternating current is converted into a high-voltage direct current by the second DC/
AC converter23, and the high-voltage direct current charges the high-voltage battery 4, so that the direct-current
energy storage device6 charges the high-voltage battery 4 (which may be referred to as V2V for short). At this time, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 can be used for synchronous rectification and operating in an open-loop fixed-frequency mode, and the seventh switch tube Q7, the eighth switch tube Q8, the ninth switch tube Q9 and the tenth switch tube Q10 are used as main switch tubes.
In summary, the
first controller30 controls the first controllable switch K1, the second single-pole double-throw switch SW2, the first DC/
AC converter22 and the fourth DC/
AC converter11, and the
second controller40 controls the first single-pole double-throw switch SW1, the first DC/
AC converter22 and the second DC/
AC converter23, respectively, so that the three-phase AC power grid charges the high-voltage battery 4, the single-phase AC power grid or the DC source 3 charges the high-voltage battery 4, and the DC
energy storage device6 charges the high-voltage battery 4, that is, the high-voltage battery 4 is charged in various ways.
Fig. 7 shows a charging mode program flow when the high-voltage battery 4 is charged by the energy routing system 100, after the power supply of the system 100 is connected, the CC/CP port may be checked first, then the CAN port may be checked, and when it is determined that the high-voltage battery 4 needs to be charged by the energy routing system 100 after the CC/CP port and the CAN port are both normal, the charging of the high-voltage battery 4 is implemented by correspondingly controlling the K1, the SW1, and the SW2 according to the three-phase ac power grid, the single-phase ac power grid, the dc power source, or the dc energy storage device input to the system 100. In this example, as shown in fig. 8, when single-phase ac power is input, the bus voltage range can be controlled to 390V to 600V, and with proper CLLLC resonance parameter design, the CLLLC basically operates at the resonance frequency point, and CLLLC efficiency is maximized; when three-phase alternating current is input, the voltage range of the bus can be controlled within 650V to 750V, the working frequency range of the CLLLC is reduced within a certain range, and the design is optimized.
In one example of the invention, referring to fig. 5, when it is determined that the high voltage battery 4 is required to discharge to the single phase ac grid or
ac load2, the
first controller30 controls the first controllable switch K1 to be in a closed state, and controls the stationary contact of the second single pole double throw switch SW2 to be connected with the first movable contact, the
second controller40 controls the stationary contact of the first single pole double throw switch SW1 to be connected with the first movable contact, and the
first controller30 controls the fourth DC/
AC converter11 according to the voltage at the DC terminal of the second DC/
AC converter23 and the voltage and current at the AC terminal of the fourth DC/
AC converter11, and the
second controller40 controls the first DC/
AC converter22 and the second DC/
AC converter23 according to the voltage and current at the DC terminal of the second DC/
AC converter23, respectively, so as to discharge the high-voltage battery 4 to the single-phase AC power grid or the
AC load2.
The third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5 and the sixth switching tube Q6 are used for synchronous rectification, the seventh switching tube Q7, the eighth switching tube Q8, the ninth switching tube Q9 and the tenth switching tube Q10 can be used as main switching tubes, and the alternating current end of the fourth DC/
AC converter11 can be connected with a single-phase alternating current power grid or an alternating
current load2. Specifically, the second DC/
AC converter23 converts the high-voltage direct current output by the high-voltage battery 4 into a high-voltage alternating current, the alternating current is converted into a low-voltage alternating current by the
transformer21, then converted into a low-voltage direct current by the first DC/
AC converter22, and then converted into a low-voltage alternating current by the fourth DC/
AC converter11, and the fourth DC/
AC converter11 outputs the low-voltage alternating current to the single-phase alternating current grid or the alternating
current load2, so that the high-voltage battery 4 is discharged to the single-phase alternating current grid (may be simply referred to as V2G), or the high-voltage battery 4 is discharged to the alternating current load 2 (.
Referring to fig. 6, when it is determined that the high-voltage battery 4 needs to discharge to the DC
energy storage device6, the
first controller30 controls the first controllable switch K1 to be in a closed state and controls the fixed contact of the second single-pole double-throw switch SW2 to be connected to the second movable contact, the
second controller40 controls the fixed contact of the first single-pole double-throw switch SW1 to be connected to the first movable contact, the
first controller30 controls the first DC/
AC converter22 according to the voltage and current of the DC terminal of the second DC/
AC converter23, and the
second controller40 controls the second DC/
AC converter23 according to the voltage and current of the DC terminal of the second DC/
AC converter23, so as to discharge the high-voltage battery 4 to the DC
energy storage device6.
Specifically, the high-voltage direct current output by the high-voltage battery 4 is converted into a high-voltage alternating current by the second DC/
AC converter23, the high-voltage alternating current is converted into a low-voltage alternating current after being subjected to voltage reduction processing by the
transformer21, the low-voltage alternating current is converted into a low-voltage direct current by the first DC/
AC converter22, and the low-voltage direct current charges the direct-current
energy storage device6, so that the high-voltage battery 4 discharges to the direct-current energy storage device 6 (which may be referred to as V2V).
As shown in fig. 9, when it is determined that the high-voltage battery 4 needs to discharge to the low-
voltage DC load5, the
first controller30 controls the first controllable switch K1 to be in the open state and controls the fixed contact of the second single-pole double-throw switch SW2 to be connected to the first movable contact, the
second controller40 controls the fixed contact of the first single-pole double-throw switch SW1 to be connected to the second movable contact, and the
second controller40 controls the second DC/
AC converter23 and the third DC/
AC converter24 according to the voltage and the current at the DC terminal of the second DC/
AC converter23, so as to discharge the high-voltage battery 4 to the low-
voltage DC load5. Referring to fig. 9, the energy routing system 100 may be configured as a synchronous rectification phase-shifted full-bridge circuit.
Specifically, the high-voltage direct current output from the high-voltage battery 4 is converted into a high-voltage alternating current by the second DC/
AC converter23, the high-voltage alternating current is converted into a low-voltage alternating current by the voltage reduction process of the
transformer21, and the low-voltage alternating current is converted into a low-voltage direct current by the third DC/
AC converter24 to supply power to the low-voltage direct
current load5, so that the high-voltage battery 4 discharges to the low-voltage direct current load 5 (may be referred to as V2L). At this time, the seventh switching tube Q7, the eighth switching tube Q8, the ninth switching tube Q9 and the tenth switching tube Q10 may be used as main switching tubes, the first switching tube Q1 and the second switching tube Q2 may function as synchronous rectification, and the
second controller40 may control the second DC/
AC converter23 and the third DC/
AC converter24 by term-shift control and current-doubler rectification to support low-voltage large-current output.
In summary, the
first controller30 controls the first controllable switch K1, the second single-pole double-throw switch SW2 and the fourth DC/
AC converter11, and the
second controller40 controls the first single-pole double-throw switch SW1, the first DC/
AC converter22 and the second DC/
AC converter23, so that the discharge of the high-voltage battery 4 to the single-phase AC power grid or the
AC load2, the discharge of the high-voltage battery 4 to the DC
energy storage device6 and the discharge of the high-voltage battery 4 to the low-
voltage DC load5 are realized, that is, the discharge of the high-voltage battery 4 is realized in various ways.
The procedure of the discharging mode procedure when the high voltage battery 4 is discharged through the energy routing system 100 is shown in fig. 10, after the power of the system 100 is connected, the CC/CP port CAN be checked first, then the CAN port CAN be checked, after the CC/CP port and the CAN port are both normal, when the high voltage battery 4 is judged to need to be discharged through the energy routing system 100, whether the voltage of the high voltage battery 4 is larger than 200V is judged first, if yes, whether the power voltage of the system 100 is lower is judged, if not, whether the aunt point of the high voltage battery 4 is larger than 300V is judged again, and if yes, the adjustment K1, SW1 and SW2 are controlled to discharge the high voltage battery 4 to the low voltage dc load; if the voltage of the high-voltage battery 4 is less than or equal to 300V, the K1, the SW1 and the SW2 are correspondingly controlled according to the accessed single-phase alternating current power grid, the alternating current load or the direct current energy storage equipment, and the discharge of the high-voltage battery 4 is realized. In this example, as shown in fig. 11, during the reverse discharge, the CLLLC circuit operates at a resonance frequency point, and inversion control is performed by a bipolar SPWM (Sinusoidal pulse width Modulation) control method.
To facilitate understanding of the energy flow in the present invention, the following describes different operating modes of the energy routing system 100 by way of a specific example in conjunction with fig. 12 and 13:
as shown in fig. 12, in a specific example, the
ac source1 is a power grid, the
ac load2 is a household appliance, the dc source 3 is a photovoltaic, the low-
voltage dc load5 is a 24V dc load, the dc
energy storage device6 is a Battery (Battery2), and the high-voltage Battery 4 is a Battery1, wherein the power grid includes a single-phase power grid
AC power grid and three phases
An alternating current network. The SPH (Smart power hub) of the energy routing system 100 is controlled by the
first controller30 and the
second controller40, so that the energy routing system 100 can operate in the operation mode as shown in fig. 13 (the direction indicated by the arrow in the figure is the energy flow direction).
As shown in fig. 13(a), charging of the high-voltage Battery2 by a single-phase ac power grid or a three-phase ac power grid is realized; as shown in fig. 13(b), discharging the high-voltage Battery2 to a single-phase alternating-current power grid or a three-phase alternating-current power grid is realized; as shown in fig. 13(c), photovoltaic charging to the high-voltage Battery2 is realized; as shown in fig. 13(d), discharging of the high voltage Battery2 to the household appliance is realized; as shown in fig. 13(e), discharging the high-voltage Battery2 to the low-voltage direct-current load of 24 is realized; as shown in fig. 13(f), the
Battery pack2 is enabled to discharge to the Battery pack 1 (direct current energy storage device), and the Battery pack 1 (direct current energy storage device) is also enabled to charge to the
Battery pack2.
As can be seen from the above examples, the energy routing system 100 can support energy storage and inversion grid-connected feedback of green clean energy (e.g., solar energy and wind energy), and can also charge the high-voltage battery 4 in multiple charging manners, so as to meet the diversification of the vehicle-mounted charging requirements.
In summary, the energy routing system according to the embodiment of the present invention realizes the multi-directional flow of energy by controlling the ac bidirectional converter and the dc bidirectional converter respectively, so as to meet the requirement of energy intercommunication.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. An energy routing system, the system comprising:
the alternating current bidirectional converter is characterized in that an alternating current end of the alternating current bidirectional converter is used for being connected with an alternating current source, an alternating current load or a direct current source;
the first direct current end of the direct current bidirectional converter is connected with the direct current end of the alternating current bidirectional converter, the second direct current end of the direct current bidirectional converter is used for connecting a high-voltage battery, and the third direct current end of the direct current bidirectional converter is used for connecting a low-voltage direct current load;
the first controller is connected with the control end of the alternating current bidirectional converter;
the second controller is connected with the control end of the direct current bidirectional converter, and is also respectively in communication connection with the first controller and the manager of the high-voltage battery;
the first controller is configured to control the ac bidirectional converter, and the second controller is configured to control the dc bidirectional converter, so as to discharge the high-voltage battery to the low-voltage dc load, the ac source, or the ac load, or charge the high-voltage battery to the ac source or the dc source.
2. The energy routing system of claim 1, wherein the dc bi-directional converter comprises:
a transformer including a primary coil, a first secondary coil, and a second secondary coil;
a first DC/AC converter, wherein a DC end of the first DC/AC converter is connected with a DC end of the alternating current bidirectional converter, an AC end of the first DC/AC converter is connected with the primary coil, and a control end of the first DC/AC converter is connected with the second controller;
a second DC/AC converter, a DC terminal of which is used for connecting the high-voltage battery, an AC terminal of which is connected to the first secondary coil, and a control terminal of which is connected to the second controller;
and the direct current end of the third DC/AC converter is used for connecting the low-voltage direct current load, the alternating current end of the third DC/AC converter is connected with the second secondary coil, and the control end of the third DC/AC converter is connected with the second controller.
3. The energy routing system of claim 2, wherein a first port of the AC terminals of the first DC/AC converter is connected to one terminal of the primary winding, a first port of the AC terminals of the third DC/AC converter is connected to one terminal of the second secondary winding, the DC bi-directional converter further comprising:
and a first single-pole double-throw switch, a stationary contact of which is connected with the second port of the alternating current terminal of the first AC/DC converter and the second port of the alternating current terminal of the third DC/AC converter, respectively, a first movable contact of which is connected with the other end of the primary coil, a second movable contact of which is connected with the other end of the second secondary coil, and a control terminal of which is connected with the second controller.
4. The energy routing system of claim 3, wherein the AC source comprises a single-phase AC grid and a three-phase AC grid, the bidirectional AC converter comprising:
a fourth DC/AC converter having an AC terminal for connecting the AC source or the AC load, and a DC terminal connected to the DC terminal of the first DC/AC converter, wherein the AC terminal of the fourth DC/AC converter includes a first phase port, a second phase port, and a third phase port;
a first controllable switch connected between the first phase port and the second phase port, a control terminal of the first controllable switch being connected to the first controller.
5. The energy routing system of claim 4, wherein the bidirectional AC converter further comprises:
a second single-pole double-throw switch, a fixed contact of which is connected with a first port of the direct-current end of the first DC/AC converter, a first movable contact of which is connected with a first port of the direct-current end of the fourth DC/AC converter, a second movable contact of which is used for connecting a positive terminal of a direct-current energy storage device, and a control terminal of which is connected with the first controller, wherein a second port of the direct-current end of the fourth DC/AC converter is connected with a second port of the direct-current end of the first DC/AC converter and used for connecting a negative terminal of the direct-current energy storage device;
the first controller is further configured to control the first DC/AC converter, and the second controller is further configured to control the second DC/AC converter, so as to charge the high-voltage battery with the DC energy storage device.
6. The energy routing system of claim 3, wherein the first DC/AC converter and the second DC/AC converter each employ an H-bridge inverter, the fourth DC/AC converter includes a first phase leg, a second phase leg, and a third phase leg, the first phase leg, the second phase leg, and the third phase leg are connected in parallel to form a first junction and a second junction, the first junction is connected to the first movable contact of the second single-pole double-throw switch, the second junction is grounded, a midpoint of the first phase leg is connected to one end of the first controllable switch, a midpoint of the second phase leg is connected to the other end of the first controllable switch, and a midpoint of the third phase leg serves as the third phase port.
7. The energy routing system of claim 2, wherein the third DC/AC converter comprises:
a first end of the first switch tube is connected with one end of the second secondary coil, and a control end of the first switch tube is connected with the second controller;
a second switch tube, a first end of which is connected to the stationary contact of the first single-pole double-throw switch, a second end of which is connected to the second end of the first switch tube and is used for connecting a negative pole end of a low-voltage direct-current load, and a control end of which is connected to the second controller;
one end of the first inductor is connected with one end of the second secondary coil, and the other end of the first inductor is used for being connected with the positive electrode end of the low-voltage direct-current load;
and one end of the second inductor is connected with the stationary contact of the first single-pole double-throw switch, and the other end of the second inductor is connected with the other end of the first inductor.
8. The energy routing system of claim 5,
when the three-phase alternating current power grid is judged to be needed to charge the high-voltage battery, the first controller controls the first controllable switch to be in a disconnected state, and controls the static contact of the second single-pole double-throw switch to be connected with the first movable contact, the second controller controls the static contact of the first single-pole double-throw switch to be connected with the first movable contact, and the first controller controls the fourth DC/AC converter according to the voltage of the DC end of the second DC/AC converter and the voltage and the current of the AC end of the fourth DC/AC converter, the second controller respectively controls the first DC/AC converter and the second DC/AC converter according to the voltage and the current of the direct-current end of the second DC/AC converter so as to charge the high-voltage battery by the three-phase alternating-current power grid;
when the single-phase alternating current power grid or the direct current source is required to charge the high-voltage battery, the first controller controls the first controllable switch to be in a closed state, and controls the static contact of the second single-pole double-throw switch to be connected with the first movable contact, the second controller controls the static contact of the first single-pole double-throw switch to be connected with the first movable contact, and the first controller controls the fourth DC/AC converter according to the voltage of the DC end of the second DC/AC converter and the voltage and the current of the AC end of the fourth DC/AC converter, the second controller controls the first DC/AC converter and the second DC/AC converter according to the voltage and the current of the direct-current end of the second DC/AC converter respectively so as to charge the high-voltage battery by the single-phase alternating-current power grid or the direct-current source;
when it is determined that the direct-current energy storage device is required to charge the high-voltage battery, the first controller controls the first controllable switch to be in a closed state and controls the fixed contact of the second single-pole double-throw switch to be connected with the second movable contact, the second controller controls the fixed contact of the first single-pole double-throw switch to be connected with the first movable contact, the first controller controls the first DC/AC converter according to the voltage and current of the direct-current end of the second DC/AC converter, and the second controller controls the second DC/AC converter according to the voltage and current of the direct-current end of the second DC/AC converter, so that the direct-current energy storage device charges the high-voltage battery.
9. The energy routing system of claim 5,
when the high-voltage battery is required to discharge to the single-phase alternating-current power grid or the alternating-current load, the first controller controls the first controllable switch to be in a closed state, and controls the static contact of the second single-pole double-throw switch to be connected with the first movable contact, the second controller controls the static contact of the first single-pole double-throw switch to be connected with the first movable contact, and the first controller controls the fourth DC/AC converter according to the voltage of the DC end of the second DC/AC converter and the voltage and the current of the AC end of the fourth DC/AC converter, the second controller respectively controls the first DC/AC converter and the second DC/AC converter according to the voltage and the current of the direct-current end of the second DC/AC converter so as to discharge the high-voltage battery to the single-phase alternating-current power grid or the alternating-current load;
when it is determined that the high-voltage battery needs to discharge to the direct-current energy storage device, the first controller controls the first controllable switch to be in a closed state and controls the fixed contact of the second single-pole double-throw switch to be connected with the second movable contact, the second controller controls the fixed contact of the first single-pole double-throw switch to be connected with the first movable contact, the first controller controls the first DC/AC converter according to the voltage and current of the direct-current end of the second DC/AC converter, and the second controller controls the second DC/AC converter according to the voltage and current of the direct-current end of the second DC/AC converter, so that the high-voltage battery can discharge to the direct-current energy storage device;
when it is determined that the high-voltage battery needs to discharge to the low-voltage direct-current load, the first controller controls the first controllable switch to be in a disconnected state and controls the fixed contact of the second single-pole double-throw switch to be connected with the first movable contact, the second controller controls the fixed contact of the first single-pole double-throw switch to be connected with the second movable contact, and the second controller controls the second DC/AC converter and the third DC/AC converter according to the voltage and the current of the direct-current end of the second DC/AC converter respectively so as to realize that the high-voltage battery discharges to the low-voltage direct-current load.
10. The energy routing system according to claim 1, wherein the voltage of the high-voltage battery is 200-500V, the rated voltage of the low-voltage dc load is 12V/27V, the first controller and the second controller are communicatively connected through an RS485 communication line, and the second controller and the manager of the high-voltage battery are connected through a CAN bus.
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