CN112134319B - Energy feedback type echelon battery charge-discharge equalization system and control method thereof - Google Patents
Energy feedback type echelon battery charge-discharge equalization system and control method thereof Download PDFInfo
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- CN112134319B CN112134319B CN202010783670.0A CN202010783670A CN112134319B CN 112134319 B CN112134319 B CN 112134319B CN 202010783670 A CN202010783670 A CN 202010783670A CN 112134319 B CN112134319 B CN 112134319B
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses an energy feedback type echelon battery charge-discharge equalization system and a control method thereof, wherein the echelon battery pack comprises a battery pack and a converter pack, the battery pack is connected with a bidirectional power conversion unit, and the battery pack is charged or discharged through the bidirectional power conversion unit according to a charge state; the battery pack comprises a plurality of battery modules which are connected in series, and the battery modules are charged or discharged through the converter pack according to the charge state difference value; the control unit respectively controls the bidirectional power conversion unit and the converter group to charge or discharge the battery pack through the charge state of the battery pack and the charge state difference value between the battery modules. The invention can integrate the echelon battery pack into a power grid, and the energy feedback type control strategy can realize the dynamic management of the battery energy, so that the minimum consumption of the energy is ensured while the charging and discharging of the echelon battery are realized.
Description
Technical Field
The invention relates to the technical field of lithium battery echelon utilization, in particular to an energy feedback type echelon battery charge-discharge balancing system and a control method thereof.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The problems of recovery and echelon utilization of the retired power storage battery caused by the rapid development of the new energy automobile industry need to be solved, for example, the retired power storage battery is used for an energy storage system, so that the recovery pressure can be effectively relieved, and the total life cycle cost of the power storage battery can be reduced;
however, the inventors believe that the problem of inconsistent safety maintenance and parameters, particularly inconsistent capacity, of the battery pack reduces the energy utilization of the battery pack, and thus, a need exists for a solution. For retired power lithium batteries, when the batteries are disassembled to a module level, the battery modules can come from different batches, different manufacturers, and the battery capacity and voltage level can be different, and the aging degree and the aging level of the batteries are different after the batteries are used, so that the problem of inconsistency can be generated; in addition, a method for carrying out parameter estimation on the charge and discharge performance test of the echelon battery in a circulating way belongs to the charge and discharge test of energy consumption type, and a large amount of energy sources can be wasted.
Disclosure of Invention
In order to solve the problems, the invention provides an energy feedback type echelon battery charge-discharge balancing system and a control method thereof, wherein the echelon battery pack can be integrated into a power grid, the charge-discharge energy of batteries and the energy conversion of the power grid are realized through a bidirectional power conversion unit, the charge-discharge of battery modules in the battery pack is balanced and controlled through a converter, an active balancing strategy is adopted for balancing among single batteries in the battery modules, the dynamic management of the battery energy is realized through the energy feedback type control strategy, and the minimum consumption of the energy is ensured while the charge-discharge of the echelon batteries is realized.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the present invention provides an energy feedback type echelon battery charge-discharge equalization system, comprising: the ladder battery pack, the two-way power conversion unit and the control unit;
the echelon battery pack comprises a battery pack and a converter pack, the battery pack is connected with the bidirectional power conversion unit, and the battery pack is charged or discharged through the bidirectional power conversion unit according to the charge state;
the battery pack comprises a plurality of battery modules which are connected in series, the battery modules are connected with the converter pack, and the battery modules are charged or discharged through the converter pack according to the charge state difference value;
the control unit respectively controls the bidirectional power conversion unit and the converter group to charge or discharge the battery pack through the charge state of the battery pack and the charge state difference value between the battery modules.
In a second aspect, the present invention provides a charge control method for an energy feedback type echelon battery charge-discharge equalization system, including:
judging the charge state of the battery pack according to the voltage and the current of the battery pack and a preset first charging threshold value, and if the charge state of the battery pack is lower than the first charging threshold value, controlling the bidirectional power conversion unit to charge the battery pack;
judging a charge state difference value between battery modules in the battery pack according to a preset second charge threshold value, and if the charge state difference value is higher than the second charge threshold value, controlling the converter pack to charge the battery modules in a low charge state;
otherwise, judging the charge state difference value between the single batteries in the battery module, and if the charge state difference value is higher than a second charge threshold value, starting active equalization to charge the batteries in a low charge state;
and the battery pack is charged until the charge state difference between the battery modules and the single batteries in the battery pack is lower than a second charge threshold value and the charge state of the battery pack is higher than a first charge threshold value.
In a third aspect, the present invention provides a discharge control method of an energy feedback type echelon battery charge-discharge equalization system, including:
judging the charge state of the battery pack according to the voltage and the current of the battery pack and a preset first discharge threshold value, and if the charge state of the battery pack is higher than the first discharge threshold value, controlling the battery pack to discharge through the bidirectional power conversion unit;
judging a charge state difference value among battery modules in the battery pack according to a preset second discharge threshold, and if the charge state difference value is higher than the second discharge threshold, controlling the battery modules in a high charge state to discharge through the converter pack;
otherwise, judging the charge state difference value between the single batteries in the battery module, and if the charge state difference value is higher than a second discharge threshold value, starting active equalization to discharge from the battery in a high charge state;
and the battery pack is discharged until the charge state difference between the battery modules and the single batteries in the battery pack is lower than a second discharge threshold value and the charge state of the battery pack is lower than a first discharge threshold value.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts the state of charge SOC as the target value, and can obtain the state of charge SOC by only sampling the voltage and the current of the battery in an actual circuit, and can realize the rapid and effective charge and discharge and the reutilization of the battery energy by combining the bidirectional power converter, the bidirectional DC/DC and the active equalization circuit; the gradient search algorithm of the invention realizes the estimation of the performance of the echelon battery, has simple energy flow control strategy, less acquisition quantity and calculation quantity, is easy to realize, and weakens the high performance requirement of the battery.
According to the invention, the echelon battery pack can be integrated into a power grid, the conversion of the charge and discharge energy of the battery and the energy of the power grid is realized through the bidirectional power conversion unit, the charge and discharge of the battery modules in the battery pack are balanced and controlled through the converter, an active balancing strategy is adopted for balancing among single batteries in the battery modules, the problem of inconsistent parameters among the batteries is solved, the dynamic management of the energy of the battery is realized through the energy feedback type control strategy, and the minimum consumption of the energy is ensured while the charge and discharge of the echelon battery is realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
Fig. 1 is a block diagram of an energy feedback type echelon battery charge-discharge equalization system provided in embodiment 1 of the present invention;
fig. 2 is a flowchart of a charge control method of the energy feedback type echelon battery charge-discharge equalization system provided in embodiment 2 of the present invention;
fig. 3 is a flowchart of a discharging control method of the energy feedback type echelon battery charging and discharging equalization system provided in embodiment 3 of the present invention;
wherein, 1, echelon battery pack; 2. a bi-directional power conversion unit; 3. a filter circuit; 4. a grid-connected circuit; 5. an ac grid and a local load; 6. a serial port or CAN communication network; 7. a battery logic control unit; 8. a DC bus voltage and current detection unit; 9. isolating the drive unit; 10. an alternating voltage current detection unit; 11. a grid-connected control unit; 12. and a control unit.
The specific embodiment is as follows:
the invention is further described below with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms also are intended to include the plural forms, and furthermore, it is to be understood that the terms "comprises" and "comprising" and any variations thereof are intended to cover non-exclusive inclusions, such as, for example, processes, methods, systems, products or devices that comprise a series of steps or units, are not necessarily limited to those steps or units that are expressly listed, but may include other steps or units that are not expressly listed or inherent to such processes, methods, products or devices.
Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Example 1
As shown in fig. 1, the present embodiment provides an energy feedback type echelon battery charge-discharge equalization system, which includes: a gradient battery pack 1, a bidirectional power conversion unit 2 and a control unit 12;
the echelon battery pack 1 comprises a battery pack and a converter pack, wherein the battery pack is connected with the bidirectional power conversion unit 2, and is charged or discharged through the bidirectional power conversion unit 2 according to the charge state;
the battery pack comprises a plurality of battery modules which are connected in series, the battery modules are connected with the converter pack, and the battery modules are charged or discharged through the converter pack according to the charge state difference value;
the control unit 12 controls the bidirectional power conversion unit 2 and the converter set to charge or discharge the battery pack respectively through the charge state of the battery pack and the charge state difference value between the battery modules.
Preferably, the converter group comprises a plurality of bidirectional DC/DC converters connected in series to realize bidirectional energy conversion from the battery module to the DC bus.
In this embodiment, the bidirectional power conversion unit 2 includes a dc filter capacitor, a power electronic device, and an ac filter circuit 3, so as to implement dc-to-ac conversion of dc bus energy;
preferably, the bidirectional power conversion unit 2 is connected to the battery pack through a dc filter capacitor.
In the embodiment, the energy storage battery pack is integrated into the power grid through the grid-connected circuit 4, the grid-connected circuit 4 comprises a grid-connected switch, and when grid-connected conditions are met, bidirectional conversion of the power grid and the energy of the battery pack is realized;
preferably, the filter circuit 3 is connected with the grid-connected circuit 4, and the grid-connected circuit is connected with an alternating current power grid and a local load 5; the alternating current power grid and the local load 5 are used for converting energy when the energy is consumed locally or discharged to the alternating current power grid;
in this embodiment, the control unit 12 communicates with the DC/DC converter set of the DC bus through a serial port or CAN communication network 6;
in the present embodiment, the control unit 12 is connected to a battery logic control unit 7, and the battery logic control unit 7 is used for detecting the voltage, the current and the temperature of the battery and controlling a relay, a fan and the like;
the control unit 12 controls the charge and discharge of the battery based on the received battery voltage and current data detected by the battery logic control unit 7.
In this embodiment, the system further includes a dc bus voltage and current detection unit 8, configured to detect a dc bus voltage and current, and calculate energy of the dc bus in real time.
The system also comprises an isolation driving unit 9, wherein when the control unit controls the bidirectional power conversion unit to charge or discharge the battery pack, the isolation of the PWM signal of the control unit 12 to the power electronic device is realized, and the on and off of the power electronic device are controlled;
the system also comprises an alternating voltage and current detection unit 10, which is used for detecting the voltage and current after the power conversion by the power conversion circuit, realizing the calculation of output voltage, current and energy, and judging the internal capacity SOC of the battery pack according to the output energy;
the system further comprises a grid-connected control unit 11 for detecting voltage and current at the grid side, controlling the integration into the grid, and outputting the energy of the battery to the grid or obtaining the energy from the grid.
Preferably, the control unit 12 employs an embedded controller MCU or DSP to control the energy flow and logic.
In the embodiment, the traditional energy storage battery is directly connected to a direct current bus and is integrated with a power grid, and a bidirectional DC/DC converter which assists energy to flow bidirectionally is used for accurately controlling charge and discharge of each group of battery modules; equalizing the SOC inside the single battery by an active equalization strategy; the energy of the battery is directly converted with an alternating current power grid by utilizing a bidirectional power converter;
aiming at the echelon test requirement of the withdrawal battery, a half-bridge cascade topology capable of realizing modularized independent control and redundant control is adopted as the topology of the echelon utilization battery energy storage system, a distributed layering architecture of local control and secondary regulation is established by combining the topological characteristics, an integrated control strategy based on the energy storage system among sub-modules is provided for realizing the stable operation of the system under distributed control and the independent control of the battery power, a half-bridge cascade topology simulation model is established, the dynamic management of the battery energy is realized through the control strategy of energy feedback, the problem of inconsistency of battery parameters is solved, and the minimum consumption of the energy is ensured while the performance test of the echelon battery is realized.
Example 2
As shown in fig. 2, the present embodiment provides a charge control method of an energy feedback type echelon battery charge-discharge equalization system, which includes:
s1: after confirming that the charging starts, the bidirectional power conversion unit charges the battery pack;
s2: detecting the voltage and the current of the battery pack, judging the charge state of the battery pack according to the voltage and the current of the battery pack and a preset first charging threshold value, and if the charge state is higher than the first charging threshold value, fully charging the battery pack energy, and stopping charging; if the power is lower than the first charging threshold, controlling the bidirectional power conversion unit to continuously charge the battery pack;
preferably, the first charging threshold is 100% of the SOC value, and can be adjusted according to the situation;
s3: judging the charge state difference value among N battery modules in the battery pack according to a preset second charge threshold value, and if the charge state difference value is higher than the second charge threshold value, controlling the bidirectional DC/DC converter group to charge the battery modules in a low charge state, and executing step S5; otherwise, executing the step S4;
the battery module with low charge state is one with lower charge state in the battery modules with any two charge states being poor;
preferably, the second charging threshold is that the single battery SOC is greater than 10% of the average SOC, and can be adjusted according to the situation;
s4: judging the charge state difference value between the single batteries in the battery module, and if the charge state difference value is higher than a second charge threshold value, starting an equalization circuit to charge the batteries in a low charge state; otherwise, executing the step S5;
s5: judging whether the charge state difference value between the battery modules and between the single batteries in the battery pack is higher than a second charge threshold value, if so, executing the step S3; otherwise, executing the step S6;
s6: judging whether the charge state of the whole battery pack is lower than a first charge threshold, if so, the battery pack is full of energy, and charging is stopped; if it is lower than the first charge threshold, step S4 is performed.
Example 3
As shown in fig. 3, the present embodiment provides a discharge control method of an energy feedback type echelon battery charge-discharge equalization system, which includes:
s1: after confirming that the discharge starts, the battery pack discharges to a power grid or a load through the bidirectional power conversion unit;
s2: detecting the voltage and the current of the battery pack, judging the charge state of the battery pack according to the voltage and the current of the battery pack and a preset first discharge threshold, and if the charge state of the battery pack is lower than the first discharge threshold, judging that the battery pack has no energy, and stopping discharging; if the voltage is higher than the first discharge threshold, controlling the battery pack to discharge through the bidirectional power conversion unit;
preferably, the first discharge threshold is an SOC value of 70%, which can be adjusted according to the situation;
s3: judging the charge state difference value among N battery modules in the battery pack according to a preset second discharge threshold, and if the charge state difference value is higher than the second discharge threshold, controlling the battery modules in a high charge state to discharge through the bidirectional DC/DC converter pack, and executing step S5; if the discharge threshold is lower than the second discharge threshold, executing step S4;
the battery module with high charge state is one with higher charge state in the battery module with any two poor charge states;
preferably, the second discharge threshold is that the single battery SOC is more than 10% of the average SOC, and the second discharge threshold can be adjusted according to the situation;
s4: judging the charge state difference value between the single batteries in the battery module, and if the charge state difference value is higher than a second discharge threshold value, starting active equalization to discharge from the battery in a high charge state; if the discharge threshold is lower than the second discharge threshold, executing step S5;
s5: judging whether the charge state difference value between the battery modules and between the single batteries in the battery pack is higher than a second discharge threshold value, if so, executing the step S3; otherwise, executing the step S6;
s6: judging whether the charge state of the whole battery pack is lower than a first discharge threshold value, if so, completing the discharge of the battery pack; otherwise, step S4 is performed.
The embodiment combines the bidirectional DC/DC, the active equalization circuit and the bidirectional power converter, can realize the rapid and effective charge and discharge of battery energy and the reutilization of energy, and can realize the estimation of the performance of the echelon battery; the energy flow control strategy of the embodiment is simple, the calculated amount is small, and the system can be ensured to run at a proper working point faster even if the system is initially operated in an unknown state.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (7)
1. A charge control method of an energy feedback type echelon battery charge-discharge equalization system, wherein the energy feedback type echelon battery charge-discharge equalization system comprises the following steps: the ladder battery pack, the two-way power conversion unit and the control unit;
the echelon battery pack comprises a battery pack and a converter pack, the battery pack is connected with the bidirectional power conversion unit, and the battery pack is charged or discharged through the bidirectional power conversion unit according to the charge state;
the control unit is configured to: judging the charge state of the battery pack, if the charge state is higher than a first charge threshold, the battery pack is full of energy, and charging is stopped; if the power is lower than the first charging threshold, controlling the bidirectional power conversion unit to continuously charge the battery pack; judging the charge state of the battery pack, and stopping discharging if the charge state of the battery pack is lower than a first discharging threshold value; if the voltage is higher than the first discharge threshold, controlling the battery pack to discharge through the bidirectional power conversion unit;
the battery pack comprises a plurality of battery modules which are connected in series, the battery modules are connected with the converter pack, and the battery modules are charged or discharged through the converter pack according to the charge state difference value;
the control unit respectively controls the bidirectional power conversion unit and the converter group to finish charging or discharging the battery pack through the charge state of the battery pack and the charge state difference value between the battery modules;
the converter group comprises a plurality of bidirectional DC/DC converters which are connected in series to realize bidirectional energy conversion from the battery module to the DC bus;
the control unit is further configured to: judging the charge state difference value among N battery modules in the battery pack according to a preset second charge threshold value, and if the charge state difference value is higher than the second charge threshold value, controlling the bidirectional DC/DC converter pack to charge the battery modules in a low charge state; judging the charge state difference value among N battery modules in the battery pack according to a preset second discharge threshold value, and if the charge state difference value is higher than the second discharge threshold value, controlling the battery modules in a high charge state to discharge through the bidirectional DC/DC converter group; judging the charge state difference value between the single batteries in the battery module, and if the charge state difference value is higher than a second charge threshold value, starting an equalization circuit to charge the batteries in a low charge state; judging the charge state difference value between the single batteries in the battery module, and if the charge state difference value is higher than a second discharge threshold value, starting active equalization to discharge from the battery in a high charge state;
the bidirectional power conversion unit comprises a direct current filter capacitor, a power electronic device and an alternating current filter circuit, and realizes the conversion from direct current to alternating current of direct current bus energy;
the bidirectional power conversion unit is connected with a grid-connected circuit through a filter circuit, and the battery pack is integrated into a power grid through the grid-connected circuit;
the charge control method includes:
judging the charge state of the battery pack according to the voltage and the current of the battery pack and a preset first charging threshold value, and if the charge state of the battery pack is lower than the first charging threshold value, controlling the bidirectional power conversion unit to charge the battery pack;
judging a charge state difference value between battery modules in the battery pack according to a preset second charge threshold value, and if the charge state difference value is higher than the second charge threshold value, controlling the converter pack to charge the battery modules in a low charge state;
otherwise, judging the charge state difference value between the single batteries in the battery module, and if the charge state difference value is higher than a second charge threshold value, starting active equalization to charge the batteries in a low charge state;
and the battery pack is charged until the charge state difference between the battery modules and the single batteries in the battery pack is lower than a second charge threshold value and the charge state of the battery pack is higher than a first charge threshold value.
2. A discharge control method of an energy feedback type echelon battery charge-discharge equalization system, wherein the energy feedback type echelon battery charge-discharge equalization system comprises the following steps: the ladder battery pack, the two-way power conversion unit and the control unit;
the echelon battery pack comprises a battery pack and a converter pack, the battery pack is connected with the bidirectional power conversion unit, and the battery pack is charged or discharged through the bidirectional power conversion unit according to the charge state;
the control unit is configured to: judging the charge state of the battery pack, if the charge state is higher than a first charge threshold, the battery pack is full of energy, and charging is stopped; if the power is lower than the first charging threshold, controlling the bidirectional power conversion unit to continuously charge the battery pack; judging the charge state of the battery pack, and stopping discharging if the charge state of the battery pack is lower than a first discharging threshold value; if the voltage is higher than the first discharge threshold, controlling the battery pack to discharge through the bidirectional power conversion unit;
the battery pack comprises a plurality of battery modules which are connected in series, the battery modules are connected with the converter pack, and the battery modules are charged or discharged through the converter pack according to the charge state difference value;
the control unit respectively controls the bidirectional power conversion unit and the converter group to finish charging or discharging the battery pack through the charge state of the battery pack and the charge state difference value between the battery modules;
the converter group comprises a plurality of bidirectional DC/DC converters which are connected in series to realize bidirectional energy conversion from the battery module to the DC bus;
the control unit is further configured to: judging the charge state difference value among N battery modules in the battery pack according to a preset second charge threshold value, and if the charge state difference value is higher than the second charge threshold value, controlling the bidirectional DC/DC converter pack to charge the battery modules in a low charge state; judging the charge state difference value among N battery modules in the battery pack according to a preset second discharge threshold value, and if the charge state difference value is higher than the second discharge threshold value, controlling the battery modules in a high charge state to discharge through the bidirectional DC/DC converter group; judging the charge state difference value between the single batteries in the battery module, and if the charge state difference value is higher than a second charge threshold value, starting an equalization circuit to charge the batteries in a low charge state; judging the charge state difference value between the single batteries in the battery module, and if the charge state difference value is higher than a second discharge threshold value, starting active equalization to discharge from the battery in a high charge state;
the bidirectional power conversion unit comprises a direct current filter capacitor, a power electronic device and an alternating current filter circuit, and realizes the conversion from direct current to alternating current of direct current bus energy;
the bidirectional power conversion unit is connected with a grid-connected circuit through a filter circuit, and the battery pack is integrated into a power grid through the grid-connected circuit;
the discharge control method includes:
judging the charge state of the battery pack according to the voltage and the current of the battery pack and a preset first discharge threshold value, and if the charge state of the battery pack is higher than the first discharge threshold value, controlling the battery pack to discharge through the bidirectional power conversion unit;
judging a charge state difference value among battery modules in the battery pack according to a preset second discharge threshold, and if the charge state difference value is higher than the second discharge threshold, controlling the battery modules in a high charge state to discharge through the converter pack;
otherwise, judging the charge state difference value between the single batteries in the battery module, and if the charge state difference value is higher than a second discharge threshold value, starting active equalization to discharge from the battery in a high charge state;
and the battery pack is discharged until the charge state difference between the battery modules and the single batteries in the battery pack is lower than a second discharge threshold value and the charge state of the battery pack is lower than a first discharge threshold value.
3. The control method according to claim 1 or 2, wherein the control unit communicates with the converter group through a serial port or a CAN communication network to complete the control of the converter group.
4. The control method according to claim 1 or 2, wherein the system further comprises a battery logic control unit for detecting the voltage and current of the battery pack and transmitting the detected voltage and current to the control unit.
5. The control method according to claim 1 or 2, wherein the system further comprises an isolation driving unit for isolating the control signal of the control unit from the bi-directional power conversion unit and controlling on and off of the bi-directional power conversion unit when the control unit controls the bi-directional power conversion unit to charge or discharge the battery pack.
6. The control method according to claim 1 or 2, wherein the system further comprises an ac voltage and current detection unit for detecting the voltage and current after the power conversion by the power conversion circuit, and performing calculation of the output voltage and current.
7. The control method according to claim 1 or 2, wherein the system further comprises a grid-connected control unit for detecting voltage and current on the grid side and controlling the integration into the grid.
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