CN212012174U - Charging and discharging control circuit of energy storage inverter - Google Patents
Charging and discharging control circuit of energy storage inverter Download PDFInfo
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- CN212012174U CN212012174U CN202020488744.3U CN202020488744U CN212012174U CN 212012174 U CN212012174 U CN 212012174U CN 202020488744 U CN202020488744 U CN 202020488744U CN 212012174 U CN212012174 U CN 212012174U
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Abstract
The utility model provides an energy storage inverter charge-discharge control circuit, this control circuit include that two-way non-separates DC-DC converter A, control circuit, two-way non-keep apart DC-DC converter B, two-way non-keep apart DC-DC converter C and controller. The control circuit has multiple working modes of isolation, non-isolation, wide-range conversion and the like, can meet the requirements of energy storage charging and discharging of the energy storage inverter under various different working conditions, can realize multiple electric energy functions through one circuit framework, has good adaptability and practicability, can meet the application requirements of the energy storage inverter charging and discharging circuits of different types by matching with a control method of the control circuit, and has good application prospect and high engineering value.
Description
Technical Field
The utility model belongs to the technical field of electron, concretely relates to charge-discharge control circuit and control method for energy storage inverter.
Background
The energy storage inverter is used as an electric energy conversion device applied to an energy storage system, can realize conversion and control management functions of various electric energy, wherein an energy storage charging and discharging circuit is used as a main conversion circuit of a core, has important functions on function realization, efficient operation and the like of the whole energy storage inverter, and is particularly applied to new energy storage application engineering in occasions such as solar photovoltaic, wind power generation and the like. The charge and discharge control circuit needs to have bidirectional electric energy conversion and can carry out unified control management on the charge and discharge of the energy storage battery. Different circuit modes are required to be adopted for different application occasions of the energy storage inverter, for example, high voltage conversion ratio is required in some occasions, and a charging and discharging circuit is required to have an isolation function in some occasions. The existing circuit adopts a single conversion circuit structure to be difficult to meet the requirements of various different application occasions, so that the circuit needs to be reconfigured and designed aiming at different application occasions, and the defects of poor flexibility, low adaptability and the like exist.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to remedy prior art's not enough, provide a charge-discharge control circuit and control method for energy storage inverter. The utility model discloses a charge-discharge circuit adopts the modularization circuit, can carry out the form of adjusting circuit constitution in a flexible way according to the energy storage charge-discharge requirement of difference, realizes the best circuit matching. The control method of the circuit can realize the high-efficiency control of the utility model circuit.
In order to achieve the above object, the present invention provides the following technical solutions:
a charge and discharge control circuit for an energy storage inverter comprises a bidirectional non-isolated DC-DC converter A, a control circuit, a bidirectional non-isolated DC-DC converter B, a bidirectional non-isolated DC-DC converter C and a controller;
the bidirectional non-isolated DC-DC converter A is respectively connected with an inversion direct-current bus of the energy storage inverter main control circuit and a control end b1 of the control circuit; the control circuit comprises transfer switches S1 and S2, wherein a1 of a common end of each of the transfer switches S1 and S2 is connected with a2, and b1 and c1 of a control end of each of the transfer switches S1 are respectively connected with an inverter direct-current bus of the bidirectional non-isolated DC-DC converter A and the energy storage inverter main control circuit;
control ends B2, C2 and d2 of the change-over switch S2 are respectively connected with a bidirectional non-isolated DC-DC converter B, an energy storage battery end direct current bus and a bidirectional isolated DC-DC converter C control circuit; the bidirectional non-isolated DC-DC converter B is respectively connected with a B2 end of the control circuit and a DC bus at the end of the energy storage battery; the bidirectional isolation DC-DC converter C is respectively connected with a d2 end of the control circuit and a direct-current bus at the end of the energy storage battery; the controller is in communication connection with the energy storage inverter main control circuit through the SPI, and the control circuit is controlled and operated.
The bidirectional non-isolated DC-DC converter A, the bidirectional non-isolated DC-DC converter B and the bidirectional non-isolated DC-DC converter C can realize different combined operation modes through the control of the control circuit, and specifically comprise the following steps: (1) when the a1 end and the B1 end of the change-over switch S1 of the control circuit are closed and switched on, and the a2 end and the B2 end of the change-over switch S2 are switched on, the bidirectional non-isolated DC-DC converter A and the bidirectional non-isolated DC-DC converter B operate in a combined mode to form a new cascade bidirectional non-isolated converter circuit, and the voltage conversion and matching capacity of charging and discharging is improved; (2) when the a1 end and the b1 end of the change-over switch S1 of the control circuit are closed and switched on, and the a2 and the c2 end of the change-over switch S2 are switched on, the equivalent bidirectional non-isolated DC-DC converter A works independently, and is suitable for charging and discharging occasions with small voltage conversion range and no need of isolation application; (3) when the a1 end and the b1 end of the change-over switch S1 of the control circuit are closed and switched on, and the a2 and the d2 end of the change-over switch S2 are switched on, the equivalent bidirectional non-isolated DC-DC converter A and the bidirectional isolated DC-DC converter C are in cascade connection, and the control circuit is suitable for charging and discharging occasions needing high-voltage conversion and isolation application; (4) when the a1 end and the c1 end of the change-over switch S1 of the control circuit are closed and switched on, and the a2 and the B2 end of the change-over switch S2 are switched on, the equivalent bidirectional non-isolated DC-DC converter B works independently, and can work alternately with the bidirectional non-isolated DC-DC converter A in a time-sharing mode, so that the working reliability of the charge-discharge circuit is improved, the service life of the charge-discharge circuit is prolonged, and the charge-discharge circuit is also suitable for the charge-discharge occasions with small voltage conversion range and without isolation application; (5) when the end a1 and the end c1 of the change-over switch S1 of the control circuit are closed and switched on, and the end a2 and the end c2 of the change-over switch S2 are switched on, the inversion direct current bus of the energy storage inverter main control circuit is connected with the direct current bus of the energy storage battery end, so that the energy storage inverter main control circuit is suitable for a discharging application occasion that the electric quantity of the energy storage battery is sufficient and is larger than a set SOCset value, and the direct discharging with high efficiency is realized without a converter circuit; (6) when the end a1 and the end C1 of the switch S1 of the control circuit are closed and switched on, and the end a2 and the end d2 of the switch S2 are switched on, the single bidirectional isolation DC-DC converter C works independently, and the control circuit is suitable for charging and discharging occasions with small voltage conversion range and needing isolation application.
The utility model also discloses a control method of charge-discharge control circuit for energy storage inverter, concrete step is as follows:
step 1: reading a working mode and a set value set by a controller, and analyzing whether the working mode is a specific working mode or an automatic working mode;
step 2: if the working mode is the formulated circuit working mode, the control circuit performs switching control work according to the formulated working mode and directly goes to the step 4; if the mode is automatic, the control circuit is controlled according to a set value;
and step 3: performing control operation of the control circuit according to the read set value, and reading a storage battery bus voltage value UDC _ BAT and an energy storage inverter main control circuit inversion direct current bus voltage value UDC _ INV; after the working mode and the charging mode are judged, the control operation is carried out according to a preset working mode;
and 4, step 4: and performing control operation of the control circuit according to the corresponding mode of the step 2 and the step 3.
Has the advantages that: the utility model provides a charge-discharge control circuit for energy storage inverter and control method thereof, this control circuit possesses simultaneously keeps apart, non-keeps apart, multiple working method such as wide range transform, can be fit for the demand that energy storage inverter energy storage under the various different work condition was charged and discharged and is used, can realize multiple electric energy function through a circuit framework, possess fine adaptability and practicality, the control method who cooperates this control circuit can satisfy the energy storage inverter charge-discharge circuit application demand of different grade type, very good application prospect and high engineering value have.
Drawings
Fig. 1 is a schematic block diagram of a circuit composition of the control circuit of the present invention;
fig. 2 is a diagram of an equivalent circuit in the control mode according to embodiment 1 of the present invention;
fig. 3 is a diagram of equivalent circuit configuration in the control mode according to embodiment 2 of the present invention;
fig. 4 is a diagram of an equivalent circuit according to the embodiment 3 of the present invention;
fig. 5 is a diagram of an equivalent circuit according to the control method of embodiment 4 of the present invention;
fig. 6 is a diagram of equivalent circuit configuration in the control mode according to embodiment 5 of the present invention;
fig. 7 is a diagram of equivalent circuit configuration in the control mode according to embodiment 6 of the present invention;
fig. 8 is a flowchart of a control method of the control circuit of the present invention.
In the figure: 1. a bidirectional non-isolated DC-DC converter A; 2. a control circuit; 3. a bidirectional non-isolated DC-DC converter B; 4. a bidirectional non-isolated DC-DC converter C; 5. a controller; 6. an energy storage inverter master control circuit; 7. an energy storage battery.
Detailed Description
The present invention is further described below with reference to specific examples, which are only exemplary and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications are intended to be included within the scope of the invention.
The following description will further describe embodiments of the present invention with reference to the accompanying drawings.
A charge and discharge control circuit for an energy storage inverter is shown in figure 1 and comprises a bidirectional non-isolated DC-DC converter A1, a control circuit 2, a bidirectional non-isolated DC-DC converter B3, a bidirectional non-isolated DC-DC converter C4 and a controller 5. The bidirectional non-isolated DC-DC converter A1 is respectively connected with an inversion direct current bus of the energy storage inverter main control circuit 6 and a control end b1 of the control circuit 2; the control circuit 2 comprises change-over switches S1 and S2, wherein A1 of a common end of each of the change-over switches S1 and S2 is connected with a2, and a control end b1 and c1 of the change-over switch S1 are respectively connected with an inverter direct-current bus of the bidirectional non-isolated DC-DC converter A1 and the energy storage inverter main control circuit 6; control ends B2, C2 and d2 of the change-over switch S2 are respectively connected with a bidirectional non-isolated DC-DC converter B3, a direct-current bus at the end of the energy storage battery 7 and a control circuit of a bidirectional isolated DC-DC converter C4; the bidirectional non-isolated DC-DC converter B3 is respectively connected with a B2 end of the control circuit 2 and a DC bus at the end of the energy storage battery 7; the bidirectional isolation DC-DC converter C4 is respectively connected with a d2 end of the control circuit 2 and a DC bus at the end of the energy storage battery 7; the controller 2 is in communication connection with the energy storage inverter main control circuit 6 through the SPI, and controls and operates the control circuit.
Fig. 2-7 are equivalent circuit composition diagrams of the control circuit under different control modes, the bidirectional non-isolated DC-DC converter A1, the bidirectional non-isolated DC-DC converter B3, and the bidirectional non-isolated DC-DC converter C4 can realize different combined operation modes by the control of the control circuit 2, specifically as shown in the following embodiments.
Example 1
As shown in fig. 2, when the A1 terminal and the B1 terminal of the switch S1 of the control circuit 2 are turned on, and the a2 and the B2 terminal of the switch S2 are turned on, the bidirectional non-isolated DC-DC converter A1 and the bidirectional non-isolated DC-DC converter B2 operate in combination to form a new cascaded bidirectional non-isolated converter circuit, so that the voltage conversion and matching capability of charging and discharging is improved.
Example 2
As shown in fig. 3, when the terminal A1 and the terminal b1 of the switch S1 of the control circuit 2 are turned on, and the terminal a2 and the terminal c2 of the switch S2 are turned on, the equivalent bidirectional non-isolated DC-DC converter A1 operates alone, and is suitable for charging and discharging occasions with a small voltage conversion range and without isolation application.
Example 3
As shown in fig. 4, when the A1 terminal and the b1 terminal of the switch S1 of the control circuit 2 are turned on, and the a2 and the d2 terminal of the switch S2 are turned on, the equivalent bidirectional non-isolated DC-DC converter A1 and the bidirectional isolated DC-DC converter C3 are in cascade connection, and are suitable for charging and discharging occasions requiring high voltage conversion and isolation applications.
Example 4
As shown in fig. 5, when the A1 terminal and the c1 terminal of the switch S1 of the control circuit 2 are turned on, and the a2 and the B2 terminal of the switch S2 are turned on, the equivalent bidirectional non-isolated DC-DC converter B2 operates alone, and in this mode, the bidirectional non-isolated DC-DC converter A1 and the equivalent bidirectional non-isolated DC-DC converter B can alternately operate in a time-sharing manner, so that the operational reliability of the charge and discharge circuit is improved, the service life of the charge and discharge circuit is prolonged, and the equivalent bidirectional non-isolated DC-DC converter B2 is also suitable for.
Example 5
As shown in fig. 6, when the a1 end and the c1 end of the switch S1 of the control circuit are closed and turned on, and the a2 and the c2 end of the switch S2 are turned on, the inverted dc bus of the main control circuit of the energy storage inverter is connected with the dc bus of the end of the energy storage battery, so that the direct discharging device is suitable for discharging applications where the electric quantity of the energy storage battery is sufficient and larger than the set SOCset value, and at this time, a converter circuit is not needed, and high-efficiency direct discharging is realized.
Example 6
As shown in fig. 7, when the a1 terminal and the C1 terminal of the switch S1 of the control circuit are turned on, and the a2 and the d2 terminal of the switch S2 are turned on, the equivalent single bidirectional isolated DC-DC converter C works independently, and is suitable for charging and discharging occasions with a small voltage conversion range and requiring isolated application.
Fig. 8 is a flowchart of a control method of the control circuit of the present invention, which includes the following steps:
step 1: reading a working mode and a set value set by a controller, and analyzing whether the working mode is a specific working mode or an automatic working mode;
step 2: if the working mode is the formulated circuit working mode, the control circuit performs switching control work according to the formulated working mode and directly goes to the step 4; if the mode is automatic, the control circuit is controlled according to a set value;
and step 3: the control operation of the control circuit is carried out according to the read set value, and the bus voltage value of the energy storage battery is readU DC_BATAnd the energy storage inverter master control circuit inverts the DC bus voltage valueU DC_INV(ii) a And control operation is performed according to the following table 1 after the working mode and the charging mode are judged.
TABLE 1
And 4, step 4: and performing control operation of the control circuit according to the corresponding mode of the step 2 and the step 3.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (7)
1. The utility model provides an energy storage inverter control circuit that charges and discharges which characterized in that: the bidirectional non-isolated DC-DC converter comprises a bidirectional non-isolated DC-DC converter A, a control circuit, a bidirectional non-isolated DC-DC converter B, a bidirectional non-isolated DC-DC converter C and a controller;
the bidirectional non-isolated DC-DC converter A is respectively connected with an inversion direct-current bus of the energy storage inverter main control circuit and a control end b1 of the control circuit; the control circuit comprises transfer switches S1 and S2, wherein a1 of a common end of each of the transfer switches S1 and S2 is connected with a2, and b1 and c1 of a control end of each of the transfer switches S1 are respectively connected with an inverter direct-current bus of the bidirectional non-isolated DC-DC converter A and the energy storage inverter main control circuit;
control ends B2, C2 and d2 of the change-over switch S2 are respectively connected with a bidirectional non-isolated DC-DC converter B, an energy storage battery end direct current bus and a bidirectional isolated DC-DC converter C control circuit; the bidirectional non-isolated DC-DC converter B is respectively connected with a B2 end of the control circuit and a DC bus at the end of the energy storage battery; the bidirectional isolation DC-DC converter C is respectively connected with a d2 end of the control circuit and a direct-current bus at the end of the energy storage battery; the controller is in communication connection with the energy storage inverter main control circuit through the SPI, and the control circuit is controlled and operated.
2. The charging and discharging control circuit of the energy storage inverter according to claim 1, characterized in that: when the a1 terminal and the B1 terminal of the changeover switch S1 of the control circuit are closed and turned on, and the a2 and the B2 terminal of the changeover switch S2 are turned on, the bidirectional non-isolated DC-DC converter a and the bidirectional non-isolated DC-DC converter B operate in combination.
3. The charging and discharging control circuit of the energy storage inverter according to claim 1, characterized in that: when the terminal a1 and the terminal b1 of the switch S1 of the control circuit are closed and turned on, and the terminal a2 and the terminal c2 of the switch S2 are turned on, the equivalent bidirectional non-isolated DC-DC converter a operates alone.
4. The charging and discharging control circuit of the energy storage inverter according to claim 1, characterized in that: when the a1 terminal and the b1 terminal of the switch S1 of the control circuit are closed and turned on, and the a2 and the d2 terminal of the switch S2 are turned on, the equivalent bidirectional non-isolated DC-DC converter A and the bidirectional isolated DC-DC converter C are in cascade connection.
5. The charging and discharging control circuit of the energy storage inverter according to claim 1, characterized in that: when the terminal a1 and the terminal c1 of the switch S1 of the control circuit are closed and turned on, and the terminal a2 and the terminal B2 of the switch S2 are turned on, the equivalent bidirectional non-isolated DC-DC converter B works alone, and in the mode, the alternating time-sharing operation with the bidirectional non-isolated DC-DC converter A can be formed.
6. The charging and discharging control circuit of the energy storage inverter according to claim 1, characterized in that: when the end a1 and the end c1 of the switch S1 of the control circuit are closed and switched on, and the end a2 and the end c2 of the switch S2 are switched on, the inversion direct current bus of the energy storage inverter main control circuit is connected with the direct current bus of the energy storage battery end.
7. The charging and discharging control circuit of the energy storage inverter according to claim 1, characterized in that: when the end a1 and the end C1 of the switch S1 of the control circuit are closed and switched on, and the end a2 and the end d2 of the switch S2 are switched on, the single bidirectional isolation DC-DC converter C works independently, and the control circuit is suitable for charging and discharging occasions with small voltage conversion range and needing isolation application.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020488744.3U CN212012174U (en) | 2020-04-07 | 2020-04-07 | Charging and discharging control circuit of energy storage inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020488744.3U CN212012174U (en) | 2020-04-07 | 2020-04-07 | Charging and discharging control circuit of energy storage inverter |
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| Publication Number | Publication Date |
|---|---|
| CN212012174U true CN212012174U (en) | 2020-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020488744.3U Active CN212012174U (en) | 2020-04-07 | 2020-04-07 | Charging and discharging control circuit of energy storage inverter |
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| CN (1) | CN212012174U (en) |
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- 2020-04-07 CN CN202020488744.3U patent/CN212012174U/en active Active
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