Charging and discharging control method and device, energy storage system, storage medium and program product

Abstract

The application discloses a charging and discharging control method and device, an energy storage system, a storage medium and a program product, and belongs to the technical field of energy storage. The charging and discharging control method comprises the following steps: in the case that a target instruction is received, a target control strategy is determined based on the topology structure of a direct-current converter and the category of the target instruction; the topology structure comprises a non-isolated single-stage direct-current converter, an isolated single-stage direct-current converter or a combined direct-current converter; the category of the target instruction comprises a forbidden charging instruction and / or a forbidden discharging instruction; the working state of a power tube in the direct-current converter is controlled based on the target control strategy; the working state comprises a conduction state or a disconnection state, and the conduction time length of the power tube in the conduction state within a switching cycle. The charging and discharging control method reduces the response delay in the charging / discharging process, realizes stable forbidden charging and / or forbidden discharging control, and improves the safety of the energy storage system.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of energy storage, and particularly relates to a charging and discharging control method and device, an energy storage system, a storage medium and a program product. BACKGROUND

[0002] A direct-current bus coupled light storage charging system usually includes an energy storage battery, a direct-current converter and a direct-current bus. Since the battery inevitably reaches a full charge or empty state during operation, if the battery continues to be charged after being fully charged, a safety risk may be caused, and if the battery continues to be discharged after being empty, irreversible damage to the battery may be caused. Therefore, how to realize prohibition of charging when the battery is fully charged and prohibition of discharging when the battery is fully discharged is a problem to be solved in the control of the energy storage system. In related technologies, the relay is usually used to cut off the loop between the energy storage battery and the direct-current bus, or the software current limiting strategy of the controller is used to set the limit value of the charging / discharging current to 0A, so as to realize the prohibition of charging and discharging. However, the above-mentioned method has a delay in the closing and opening process of the relay, and cannot meet the requirement of fast discharging, and it is difficult to realize stable prohibition of charging and discharging. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a charging and discharging control method and device, an energy storage system, a storage medium and a program product, which reduces the response delay in the charging / discharging process, realizes stable prohibition of charging and / or discharging, and improves the safety of the energy storage system.

[0004] In a first aspect, the present application provides a charging and discharging control method, which comprises:

[0005] In the case where a target instruction is received, a target control strategy is determined based on the topology structure of the direct-current converter and the category of the target instruction; the topology structure includes a non-isolated single-stage direct-current converter, an isolated single-stage direct-current converter or a combined direct-current converter; the category of the target instruction includes a prohibition of charging instruction and / or a prohibition of discharging instruction;

[0006] Based on the target control strategy, the working state of the power tube in the direct-current converter is controlled; the working state includes a conduction state or a disconnection state, and the conduction time length of the power tube in the conduction state in a switching cycle.

[0007] According to the charge-discharge control method, based on the topology of the DC converter and the no-charge and / or no-discharge instruction, the flow of the charge-discharge current in the circuit is effectively inhibited by controlling the working state of each power tube in the DC converter, stable no-charge and / or no-discharge control is realized, and the safety of the energy storage system is improved. At the same time, by optimizing the wave output mode of each power tube in the DC converter, the response delay in the charging / discharging process is reduced, thereby meeting the demand for fast charging / discharging and ensuring the continuity of the AC side power supply.

[0008] According to an embodiment of the present application, in the case of receiving a target instruction, based on the topology of the DC converter and the category of the target instruction, a target control strategy is determined, comprising:

[0009] Based on the category of the target instruction and the topology, a target power tube to be adjusted is determined.

[0010] Based on the topology, a control strategy corresponding to the target power tube is determined.

[0011] According to an embodiment of the present application, the target power tube to be adjusted is determined based on the category of the target instruction and the topology, comprising:

[0012] In the case that the category of the target instruction is the no-charge instruction or the no-discharge instruction, and the topology is the non-isolated single-stage DC converter, the main power tube in the DC converter is determined as the target power tube.

[0013] In the case that the category of the target instruction is the no-charge instruction and the no-discharge instruction, and the topology is the non-isolated single-stage DC converter, each power tube in the DC converter is determined as the target power tube.

[0014] According to an embodiment of the present application, the control strategy corresponding to the target power tube is determined based on the topology, comprising:

[0015] In the case that the topology is the non-isolated single-stage DC converter, the control strategy corresponding to the target power tube is determined as:

[0016] The on duration of the target power tube is reduced until a first preset value is reached; wherein the on duration in the previous switching period is greater than the on duration in the next switching period.

[0017] According to an embodiment of the present application, the target power tube to be adjusted is determined based on the category of the target instruction and the topology, comprising:

[0018] In a case where the category of the target instruction is the charge prohibition instruction and the topology structure is the isolated single-stage DC converter, each power tube in a bridge circuit connected with a DC bus in the DC converter is determined as the target power tube;

[0019] In a case where the category of the target instruction is the discharge prohibition instruction and the topology structure is the isolated single-stage DC converter, each power tube in a bridge circuit connected with an energy storage battery in the DC converter is determined as the target power tube;

[0020] In a case where the category of the target instruction is the charge prohibition instruction and the discharge prohibition instruction and the topology structure is the isolated single-stage DC converter, each power tube in the DC converter is determined as the target power tube.

[0021] According to an embodiment of the present application, the control strategy corresponding to the target power tube is determined based on the topology structure, including:

[0022] In a case where the topology structure is the isolated single-stage DC converter, the control strategy corresponding to the target power tube is determined as:

[0023] The on duration of the target power tube is reduced, and it is ensured that the on duration of the target power tube is less than the on duration of a first power tube corresponding to the target power tube in another bridge circuit in the DC converter in a same switching cycle.

[0024] According to an embodiment of the present application, in a case where the category of the target instruction is the charge prohibition instruction and the topology structure is the isolated single-stage DC converter, the other bridge circuit is a bridge circuit connected with an energy storage battery in the DC converter;

[0025] In a case where the category of the target instruction is the discharge prohibition instruction and the topology structure is the isolated single-stage DC converter, the other bridge circuit is a bridge circuit connected with a DC bus in the DC converter.

[0026] According to an embodiment of the present application, in a case where the category of the target instruction is the charge prohibition instruction and the topology structure is the isolated single-stage DC converter, the other bridge circuit is a bridge circuit connected with an energy storage battery in the DC converter;

[0027] In a case where the topology structure is the combined DC converter, the target control strategy is determined as:

[0028] The target control strategy is determined from at least one control strategy corresponding to a single topology of at least one converter included in the combined DC converter, the at least one control strategy being matched with the single topology of the at least one converter included in the combined DC converter, the single topology including a non-isolated single-stage DC converter or an isolated single-stage DC converter.

[0029] In a second aspect, the present application provides a charge-discharge control device, which comprises:

[0030] The first processing module is configured to determine a target control strategy based on a topology of the DC converter and a category of the target instruction when the target instruction is received, the topology including a non-isolated single-stage DC converter, an isolated single-stage DC converter or a combined DC converter, and the category of the target instruction including a charge prohibition instruction and / or a discharge prohibition instruction.

[0031] The second processing module is configured to control a working state of a power tube in the DC converter based on the target control strategy, the working state including a conduction state or a disconnection state, and a conduction time length of the power tube in the conduction state in a switching cycle.

[0032] According to the charge-discharge control device of the present application, the flow of charge / discharge current in the circuit is effectively inhibited by controlling the working state of each power tube in the DC converter based on the topology of the DC converter and the charge prohibition and / or discharge prohibition instruction, the stable charge prohibition and / or discharge prohibition control is achieved, and the safety of the energy storage system is improved. Meanwhile, the response delay in the charge / discharge process is reduced by optimizing the wave-out mode of each power tube in the DC converter, so that the demand for fast charge / discharge is met, and the continuity of AC side power supply is ensured.

[0033] In a third aspect, the present application provides an energy storage system, which comprises:

[0034] An energy storage battery;

[0035] A DC bus;

[0036] A DC converter electrically connected with the energy storage battery and the DC bus respectively;

[0037] The charge-discharge control device as described in the second aspect above is electrically connected with the DC converter.

[0038] According to an embodiment of the present application, the topology of the DC converter includes a non-isolated single-stage DC converter, an isolated single-stage DC converter or a combined DC converter.

[0039] According to one embodiment of the present application, the connection mode between the input terminals of the combined DC converter includes series or parallel connection, and the connection mode between the output terminals of the combined DC converter includes series or parallel connection.

[0040] In a fourth aspect, the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the charge and discharge control method according to the first aspect.

[0041] In a fifth aspect, the present application provides a non-transitory computer-readable storage medium, having a computer program stored thereon, wherein the computer program is executable by a processor to implement the charge and discharge control method according to the first aspect.

[0042] In a sixth aspect, the present application provides a computer program product, comprising a computer program, wherein the computer program is executable by a processor to implement the charge and discharge control method according to the first aspect.

[0043] The one or more technical solutions described above in the embodiments of the present application have at least one of the following technical effects:

[0044] Based on the topology of the DC converter and the charge prohibition and / or discharge prohibition instruction, the flow of the charging / discharging current in the circuit is effectively inhibited by controlling the working state of each power tube in the DC converter, the stable charge prohibition and / or discharge prohibition control is achieved, and the safety of the energy storage system is improved. At the same time, by optimizing the wave output mode of each power tube in the DC converter, the response delay in the charging / discharging process is reduced.

[0045] Further, in the case of receiving the charge prohibition and / or discharge prohibition instruction, the conduction time of each power tube is controlled by optimizing the wave output mode of each power tube in the DC converter, the response delay in the charging / discharging process is reduced, the demand for fast charging / discharging is met, and the continuity of the AC side power supply is ensured, thereby achieving stable charge prohibition and / or discharge prohibition control and improving the safety of the energy storage system.

[0046] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0047] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0048] Figure 1 is one of the flow diagrams of the charge and discharge control method provided by the embodiments of the present application;

[0049] Figure 2 is a schematic diagram of a non-isolated DC converter provided by an embodiment of the present application;

[0050] Figure 3 is a structural diagram of a non-isolated DC converter provided by an embodiment of the present application;

[0051] Figure 4 is a schematic diagram of an isolated DC converter provided by an embodiment of the present application;

[0052] Figure 5 is a structural diagram of an isolated DC converter provided by an embodiment of the present application;

[0053] Figure 6 is one of schematic diagrams of an output wave timing of an isolated DC converter provided by an embodiment of the present application;

[0054] Figure 7 is another of schematic diagrams of an output wave timing of an isolated DC converter provided by an embodiment of the present application;

[0055] Figure 8 is still another of schematic diagrams of an output wave timing of an isolated DC converter provided by an embodiment of the present application;

[0056] Figure 9 is still another of schematic diagrams of an output wave timing of an isolated DC converter provided by an embodiment of the present application;

[0057] Figure 10 is one of schematic diagrams of a combined DC converter provided by an embodiment of the present application;

[0058] Figure 11 is another of schematic diagrams of a combined DC converter provided by an embodiment of the present application;

[0059] Figure 12 is still another of schematic diagrams of a combined DC converter provided by an embodiment of the present application;

[0060] Figure 13 is still another of schematic diagrams of a combined DC converter provided by an embodiment of the present application;

[0061] Figure 14 is still another of schematic diagrams of a combined DC converter provided by an embodiment of the present application;

[0062] Figure 15 is still another of schematic diagrams of a combined DC converter provided by an embodiment of the present application;

[0063] Figure 16 is still another of schematic diagrams of a combined DC converter provided by an embodiment of the present application;

[0064] Figure 17Fig. 18 is a schematic diagram of a combined DC converter provided by an embodiment of the present application;

[0065] Figure 18 Fig. 19 is a schematic diagram of a combined DC converter provided by an embodiment of the present application;

[0066] Figure 19 Fig. 20 is a schematic diagram of a combined DC converter provided by an embodiment of the present application;

[0067] Figure 20 Fig. 21 is a schematic diagram of a combined DC converter provided by an embodiment of the present application;

[0068] Figure 21 Fig. 22 is a schematic diagram of a combined DC converter provided by an embodiment of the present application;

[0069] Figure 22 Fig. 23 is a schematic diagram of a combined DC converter provided by an embodiment of the present application;

[0070] Figure 23 Fig. 24 is a schematic diagram of a combined DC converter provided by an embodiment of the present application;

[0071] Figure 24 Fig. 25 is a schematic diagram of a combined DC converter provided by an embodiment of the present application;

[0072] Figure 25 Fig. 26 is a schematic diagram of a combined DC converter provided by an embodiment of the present application;

[0073] Figure 26 Fig. 27 is a schematic diagram of a combined DC converter provided by an embodiment of the present application;

[0074] Figure 27 Fig. 28 is a schematic diagram of a combined DC converter provided by an embodiment of the present application;

[0075] Figure 28 Fig. 29 is a schematic diagram of a combined DC converter provided by an embodiment of the present application;

[0076] Figure 29 Fig. 30 is a schematic diagram of a combined DC converter provided by an embodiment of the present application;

[0077] Figure 30 Fig. 31 is a flowchart of a charging and discharging control method provided by an embodiment of the present application;

[0078] Figure 31 Fig. 32 is a schematic diagram of a charging and discharging control device provided by an embodiment of the present application;

[0079] Figure 32 Fig. 33 is a schematic diagram of an electronic device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0080] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0081] The terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally a category and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in a "or" relationship.

[0082] The charging and discharging control method, device, energy storage system, electronic device and readable storage medium provided by the embodiments of the present application will be described in detail below with reference to the drawings and specific embodiments and their application scenarios.

[0083] The charging and discharging control method can be applied to a terminal, and can be executed by hardware or software in the terminal.

[0084] The charging and discharging control method provided by the embodiments of the present application, the execution subject of the charging and discharging control method can be an energy storage system or a functional module or functional entity in the energy storage system capable of implementing the charging and discharging control method. The charging and discharging control method provided by the embodiments of the present application will be described below with the energy storage system as an execution subject.

[0085] As shown in the figure, the charging and discharging control method comprises steps 110 and 120. Figure 1

[0086] Step 110, in the case of receiving a target instruction, determining a target control strategy based on the topology structure of the direct current converter and the category of the target instruction.

[0087] In this step, the topology structure includes a non-isolated single-stage direct current converter, an isolated single-stage direct current converter or a combined direct current converter.

[0088] ​The target instruction includes a forbidden charging instruction and / or a forbidden discharging instruction. The forbidden charging instruction is used to instruct to prohibit continuous charging when the battery is in a full charging state, and the forbidden discharging instruction is used to instruct to prohibit continuous discharging when the battery is in an empty state. The target instruction can be obtained based on battery state information such as a battery SOC, a detected voltage, and the like.

[0089] In some embodiments, in a case where the target instruction is received, a target control strategy is determined based on a topology of the direct-current converter and a category of the target instruction, including:

[0090] Based on the category of the target instruction and the topology, a target power tube to be adjusted is determined.

[0091] Based on the topology, a control strategy corresponding to the target power tube is determined.

[0092] In this embodiment, the topology includes a non-isolated single-stage direct-current converter, an isolated single-stage direct-current converter, or a combined direct-current converter. The target instruction includes a forbidden charging instruction and / or a forbidden discharging instruction.

[0093] The target power tube refers to a power tube located in a main circuit of the direct-current converter and capable of conducting or turning off control of a battery charging current or a battery discharging current. In this embodiment, the target power tube is determined based on the category of the target instruction and the topology.

[0094] In some embodiments, in a case where the topology is a non-isolated single-stage direct-current converter, a structural diagram thereof can refer to Figure 3 The non-isolated single-stage direct-current converter does not include a transformer and generally includes at least two power switch tubes. In a charging mode and / or a discharging mode, when one of the power tubes is in a conducting state and is used to adjust inductive current flowing into or out of the battery, the power tube can be defined as a main power tube in the direction, and a power tube cooperating with the main power tube and used to provide a freewheeling path can be defined as a synchronous power tube in the direction. In a case where the system does not need to be forbidden to charge or discharge, in order to improve power conversion efficiency, the main power tube and the synchronous tube generally have a conducting interval, the main power tube serves as a main channel for power transmission, and the synchronous tube serves as a freewheeling path for inductive current.

[0095] In this embodiment, a schematic diagram of the non-isolated single-stage direct-current converter can refer to Figure 2 The circuit includes an energy storage battery, an inductor L1, two power switch tubes K1 and K2, and corresponding anti-parallel diodes D1 and D2, respectively. One end of the inductor L1 is connected to the positive electrode of the energy storage battery, the other end is connected to K1, K2, and D1, D2, and the negative electrode of the energy storage battery is grounded.

[0096] In some embodiments, continuing to refer to Figure 2 The main power tube in the non-isolated single-stage direct-current converter is determined, including:

[0097] In the case of the power tube K1 being turned on, the inductor L1 current flowing into the positive electrode direction of the battery increases, and it is determined that K1 is the main power tube in the charging direction and K2 is the synchronous tube;

[0098] In the case of the power tube K2 being turned on, the inductor L1 current flowing out of the positive electrode direction of the battery increases, and it is determined that K2 is the main power tube in the discharging direction and K1 is the synchronous tube.

[0099] In some embodiments, based on the category of the target instruction and the topology structure, the target power tube to be adjusted is determined, including:

[0100] In the case of the category of the target instruction being the charge prohibition instruction or the discharge prohibition instruction and the topology structure being the non-isolated single-stage DC converter, the main power tube in the DC converter is determined as the target power tube;

[0101] In the case of the category of the target instruction being the charge prohibition instruction and the discharge prohibition instruction and the topology structure being the non-isolated single-stage DC converter, each power tube in the DC converter is determined as the target power tube.

[0102] In this embodiment, continuing to refer to Figure 2 , the topology structure is the non-isolated single-stage DC converter, including:

[0103] In the case of the category of the target instruction being the charge prohibition instruction, the main power tube K1 in the charging direction is determined as the target power tube;

[0104] In the case of the category of the target instruction being the discharge prohibition instruction, the main power tube K2 in the discharging direction is determined as the target power tube;

[0105] In the case of the category of the target instruction being the charge prohibition instruction and the discharge prohibition instruction, K1 and K2 are both determined as the target power tube.

[0106] In some embodiments, based on the topology structure, the control strategy corresponding to the target power tube is determined, including:

[0107] In the case of the topology structure being the non-isolated single-stage DC converter, the control strategy corresponding to the target power tube is determined as:

[0108] The on duration of the target power tube is reduced until a first preset value is reached; wherein the on duration in the previous switching cycle is greater than the on duration in the next switching cycle.

[0109] The first preset value is used to limit the on duration of the target power tube, which can be customized by the user. In some embodiments, the first preset value can be set to 0.

[0110] In some embodiments, the current value of the conduction duration of the target power tube is T, which is reduced by a preset time step in each subsequent switching cycle , so that the conduction duration of the target power tube is reduced from the current value T to 0. Wherein, the preset time step may be customized by the user.

[0111] In this embodiment, with reference to Figure 2 , in the case of a non-isolated single-stage DC converter, the control strategy corresponding to the target power tube is determined, including:

[0112] Strategy 1: In the case of the category of the target instruction being a charge prohibition instruction, the conduction duration of the target power tube K1 is reduced from the current value until it reaches 0, and then the conduction duration of K1 remains 0 until the charge prohibition state is exited.

[0113] Strategy 2: In the case of the category of the target instruction being a discharge prohibition instruction, the conduction duration of the target power tube K2 is reduced from the current value until it reaches 0, and then the conduction duration of K2 remains 0 until the discharge prohibition state is exited.

[0114] Strategy 3: In the case of the category of the target instruction being a charge prohibition instruction and a discharge prohibition instruction, the conduction duration of the target power tubes K1 and K2 are both reduced from the current value until they reach 0, and then K1 or K2 remains blocked until the charge prohibition and discharge prohibition states are exited.

[0115] In some embodiments, the topology is an isolated single-stage DC converter, and its structural diagram can be referred to Figure 5 , which generally consists of two bridge circuits (i.e. bridge circuit 1 and bridge circuit 2), a transformer and a resonant cavity.

[0116] With reference to Figure 5 , when charging the energy storage battery, the bridge circuit 2 connected to the DC bus is called an inverter bridge, which transfers the DC bus energy to the resonant cavity; the bridge circuit 1 connected to the energy storage battery is called a rectifier bridge, which rectifies the alternating current generated by the resonant cavity into a direct current to charge the battery.

[0117] With reference to Figure 5 , when discharging the energy storage battery, the bridge circuit 1 connected to the energy storage battery is called an inverter bridge, which transfers the battery energy to the resonant cavity; the bridge circuit 2 connected to the DC bus is called a rectifier bridge, which rectifies the alternating current generated by the resonant cavity into a direct current to transfer to the DC bus. It should be noted that the resonant cavity can be any resonant cavity possessed by a resonant converter, such as LLC, CLLC, CLLLL, etc., which is not limited in the present application.

[0118] In this embodiment, the schematic diagram of the isolated single-stage DC converter can be referred to Figure 4The circuit comprises a bridge circuit 1 connected to the direct current side of the energy storage battery, a bridge circuit 2 connected to the direct current bus, and a resonant cavity and a transformer between the bridge circuit 1 and the bridge circuit 2. The bridge circuit 1 is composed of power tubes K1-K4 and diodes D1-D4 corresponding to the parallel connection of the power tubes. The bridge circuit 2 is composed of power tubes K5-K8 and diodes D5-D8 corresponding to the parallel connection of the power tubes. The energy storage battery is coupled to the resonant cavity and the transformer through the bridge circuit 1, and then connected to the direct current bus through the bridge circuit 2.

[0119] In some embodiments, based on the category of the target instruction and the topology structure, the target power tube to be adjusted is determined, comprising:

[0120] In the case that the category of the target instruction is the charge prohibition instruction and the topology structure is the isolated single-stage direct current converter, each power tube in the bridge circuit connected to the direct current bus in the direct current converter is determined as the target power tube;

[0121] In the case that the category of the target instruction is the discharge prohibition instruction and the topology structure is the isolated single-stage direct current converter, each power tube in the bridge circuit connected to the energy storage battery in the direct current converter is determined as the target power tube;

[0122] In the case that the category of the target instruction is the charge prohibition instruction and the discharge prohibition instruction and the topology structure is the isolated single-stage direct current converter, each power tube in the direct current converter is determined as the target power tube.

[0123] In this embodiment, in the case that the topology structure is the isolated single-stage direct current converter, the target power tube to be adjusted is determined according to Figure 4 , comprising:

[0124] In the case that the category of the target instruction is the charge prohibition instruction, each power tube K5-K8 in the bridge circuit 2 connected to the direct current bus in the direct current converter is determined as the target power tube;

[0125] In the case that the category of the target instruction is the discharge prohibition instruction, each power tube K1-K4 in the bridge circuit 1 connected to the energy storage battery in the direct current converter is determined as the target power tube;

[0126] In the case that the category of the target instruction is the charge prohibition instruction and the discharge prohibition instruction, each power tube K1-K8 in the direct current converter is determined as the target power tube.

[0127] In some embodiments, based on the topology structure, the control strategy corresponding to the target power tube is determined, comprising:

[0128] In the case that the topology structure is the isolated single-stage direct current converter, the control strategy corresponding to the target power tube is determined as:

[0129] The on duration of the target power tube is reduced, and the on duration of the target power tube in the same switching cycle is less than the on duration of the first power tube corresponding to the target power tube in another bridge circuit in the direct current converter.

[0130] In some embodiments, the current value of the on duration of the target power tube is T, and the on duration of the target power tube is reduced by a preset time step in each subsequent switching cycle , so that the on duration of the target power tube is reduced from the current value T to 0. The preset time step may be customized by a user.

[0131] In some embodiments, the on duration of the target power tube can be reduced until a second preset value is reached.

[0132] The second preset value is used to limit the on duration of the target power tube and can be customized by a user. In some embodiments, the second preset value can be set to 0.

[0133] In some embodiments, when the category of the target instruction is the charge prohibition instruction and the topology structure is the isolated single-stage direct current converter, the other bridge circuit is the bridge circuit connected to the energy storage battery in the direct current converter.

[0134] When the category of the target instruction is the discharge prohibition instruction and the topology structure is the isolated single-stage direct current converter, the other bridge circuit is the bridge circuit connected to the direct current bus in the direct current converter.

[0135] In this embodiment, with reference to Figure 4 , when the category of the target instruction is the charge prohibition instruction, each power tube K5-K8 in the bridge circuit 2 connected to the direct current bus is determined as the target power tube, the other bridge circuit is the bridge circuit 1 connected to the energy storage battery, and each power tube K1-K4 in the bridge circuit 1 is determined as the first power tube corresponding to the target power tube, i.e., K5 corresponds to K1, K6 corresponds to K2, K7 corresponds to K3, and K8 corresponds to K4.

[0136] With reference to Figure 4 , when the category of the target instruction is the discharge prohibition instruction, each power tube K1-K4 in the bridge circuit 1 connected to the energy storage battery is determined as the target power tube, the other bridge circuit is the bridge circuit 2 connected to the direct current bus, and each power tube K5-K8 in the bridge circuit 2 is determined as the first power tube corresponding to the target power tube, i.e., K1 corresponds to K5, K2 corresponds to K6, K3 corresponds to K7, and K4 corresponds to K8.

[0137] The control strategy for determining the target power tube is described below when the topology structure is the isolated single-stage direct current converter.

[0138] Strategy 4: When the target instruction is a charge-disable instruction, in some embodiments, the charge-disable output timing of the isolated converter is as follows: Figure 6 As shown: Specifically, within the same switching cycle, the conduction duration of power transistors K1 to K4 is kept at the current value, while the conduction duration of power transistors K5 to K8 is gradually reduced, so that the conduction duration of the switching transistors in bridge circuit 2 within the same switching cycle is shorter than the conduction time of the corresponding switching transistors in bridge circuit 1, i.e., K5 is shorter than K1, K6 is shorter than K2, K7 is shorter than K3, and K8 is shorter than K4. In some embodiments, the conduction duration of power transistors K5 to K8 can be reduced until a second preset value is reached, and the above output logic is maintained until the charging-disabled state is exited; in this embodiment, the second preset value can be 0, and the charging-disabled output timing of the isolated converter is as follows: Figure 7 As shown: Specifically, power transistors K5 to K8 are kept off during the same switching cycle and the conduction time is 0. At this time, bridge circuit 2 is completely stopped from conducting.

[0139] Strategy 5: When the target instruction is a disable instruction, in some embodiments, the disable output timing of the isolated converter is as follows: Figure 8 As shown: Specifically, within the same switching cycle, the conduction duration of power transistors K5 to K8 is kept at the current value, while the conduction duration of power transistors K1 to K4 is gradually reduced, so that the conduction duration of the switching transistors in bridge circuit 1 within the same switching cycle is shorter than the conduction time of the corresponding switching transistors in bridge circuit 2, i.e., K1 is shorter than K5, K2 is shorter than K6, K3 is shorter than K7, and K4 is shorter than K8. In some embodiments, the conduction duration of power transistors K1 to K4 can be reduced until a second preset value is reached, and the above-mentioned output logic is maintained until the ban state is exited; in this embodiment, the second preset value can be 0, and the ban output timing of the isolated converter is as follows: Figure 9 As shown, specifically, power transistors K1 to K4 are kept off during the same switching cycle and the conduction time is 0. At this time, bridge circuit 1 is completely stopped from conducting.

[0140] Strategy 6: When the target instruction is classified as a charge-disable instruction or a release-disable instruction, refer to... Figure 4 The conduction time of power transistors K1 to K8 contained in bridge circuit 1 and bridge circuit 2 at both ends of the resonant cavity in the isolated converter is gradually reduced to 0, and then the waveform is blocked until the charging and discharging are prohibited.

[0141] According to the charge and discharge control method provided in the embodiment of the present application, in the case of receiving the charge prohibition and / or discharge prohibition instruction, the turn-on time of each power tube is controlled by optimizing the out-wave mode of each power tube in the DC converter, the response delay in the charging / discharging process is reduced, the demand for fast charging / discharging is met, and the continuity of the AC side power supply is ensured, so as to realize stable charge prohibition / discharge prohibition control and improve the safety of the energy storage system.

[0142] In some embodiments, in the case of receiving the target instruction, the target control strategy is determined based on the topology structure of the DC converter and the category of the target instruction, including:

[0143] In the case of the topology structure being a combined DC converter, the target control strategy is determined as:

[0144] Based on the single-type topology structure of the converter included in the combined DC converter and the category of the target instruction, at least one control strategy from the control strategies corresponding to each single-type topology structure is selected to determine the target control strategy.

[0145] In this embodiment, the selected at least one control strategy matches the single-type topology structure of at least one converter included in the combined DC converter, and the single-type topology structure includes a non-isolated single-stage DC converter or an isolated single-stage DC converter. The category of the target instruction includes a charge prohibition instruction and / or a discharge prohibition instruction.

[0146] In some embodiments, the component categories of the combined DC converter can include but are not limited to: composed of a single or multiple non-isolated converters, composed of a single or multiple isolated converters, and composed of a single or multiple non-isolated converters and a single or multiple isolated converters in cascade.

[0147] In some embodiments, referring to Figure 10 to Figure 14 In the case of the combined DC converter being composed of a single or multiple non-isolated converters and not being in charge prohibition or discharge prohibition, the main power tube and the synchronous tube in the combined DC converter both have a turn-on interval.

[0148] In this embodiment, in the case of the combined DC converter being composed of a single or multiple non-isolated converters, the target control strategy is determined based on the category of the target instruction, including:

[0149] Referring to Figure 30 In the case of the category of the target instruction being a charge prohibition instruction, the target power tube in the non-isolated converter in the combined DC converter is controlled based on strategy 1.

[0150] Continuing to refer to Figure 30In the case that the category of the target instruction is the forbidden charging instruction, the target power tube in the non-isolated converter in the combined type is controlled based on strategy 2;

[0151] With reference to the foregoing Figure 30 In the case that the category of the target instruction is the forbidden charging instruction and the forbidden discharging instruction, the target power tube in the isolated converter in the combined type is controlled based on strategy 6.

[0152] The specific control processes corresponding to strategies 4 to 6 in this embodiment have been described in detail in the foregoing, and will not be described again here.

[0153] In some embodiments, with reference to the foregoing Figure 15 to Figure 19 In the case that the combined DC converter is composed of a single or multiple isolated converters and is not in the forbidden charging or forbidden discharging state, the power tubes included in the multiple bridge circuits in the combined DC converter all have a conduction interval.

[0154] In this embodiment, in the case that the combined DC converter is composed of a single or multiple isolated converters, a target control strategy is determined based on the category of a target instruction, including:

[0155] With reference to the foregoing Figure 30 In the case that the category of the target instruction is the forbidden charging instruction, the target power tube in the isolated converter in the combined type is controlled based on strategy 4;

[0156] With reference to the foregoing Figure 30 In the case that the category of the target instruction is the forbidden discharging instruction, the target power tube in the isolated converter in the combined type is controlled based on strategy 5;

[0157] With reference to the foregoing Figure 30 In the case that the category of the target instruction is the forbidden charging instruction and the forbidden discharging instruction, the target power tube in the isolated converter in the combined type is controlled based on strategy 6.

[0158] The specific control processes corresponding to strategies 4 to 6 in this embodiment have been described in detail in the foregoing, and will not be described again here.

[0159] In some embodiments, with reference to the foregoing Figure 20 to Figure 29 In the case that the combined DC converter is composed of a single or multiple non-isolated converters and a single or multiple isolated converters in cascade, a target control strategy is determined based on the category of a target instruction, including:

[0160] With reference to the foregoing Figure 30 The selected at least one control strategy matches the single-type topology of at least one converter included in the combined DC converter.

[0161] In this embodiment, in the case that the combined DC converter is composed of a single or multiple non-isolated converters and a single or multiple isolated converters in cascade, a target control strategy is determined based on the category of a target instruction, including: Figure 21 andFigure 22 For example, in the case where the combined DC converter is composed of a single non-isolated converter and a single isolated converter in cascade, based on the category of the target instruction, one of the multiple target control strategies can be selected to control the corresponding type of DC converter in the combined DC converter:

[0162] In the case where the category of the target instruction is the charge prohibition instruction, the target power tube in the non-isolated converter in the combined DC converter is controlled based on the strategy 1, or the target power tube in the isolated converter in the combined DC converter is controlled based on the strategy 4, or the target power tubes in the corresponding type of converter in the combined DC converter are controlled based on the strategy 1 and the strategy 4 respectively;

[0163] In the case where the category of the target instruction is the discharge prohibition instruction, the target power tube in the non-isolated converter in the combined DC converter is controlled based on the strategy 2, or the target power tube in the isolated converter in the combined DC converter is controlled based on the strategy 5, or the target power tubes in the corresponding type of converter in the combined DC converter are controlled based on the strategy 2 and the strategy 5 respectively;

[0164] In the case where the category of the target instruction is the charge prohibition instruction and the discharge prohibition instruction, the target power tube in the non-isolated converter in the combined DC converter is controlled based on the strategy 3, or the target power tube in the isolated converter in the combined DC converter is controlled based on the strategy 6, or the target power tubes in the corresponding type of converter in the combined DC converter are controlled based on the strategy 3 and the strategy 6 respectively.

[0165] The specific control process of the target control strategy in this embodiment has been described in detail in the foregoing, and will not be described here.

[0166] It can be understood that, in the case where the combined DC converter is composed of a single non-isolated converter and a single isolated converter in cascade, Figure 20 to Figure 29 , the target strategy corresponding to the combined DC converter composed of two converters in series / parallel cascade shown in Figure 23 to Figure 29 is similar to the target control strategy described in the foregoing Figure 21 and Figure 22 , and will not be described here.

[0167] In some embodiments, with reference to Figure 30 , the charge and discharge control method further comprises:

[0168] In the case where the target instruction is not received, returning to the starting step and repeating the step 110 and the step 120.

[0169] The step 120 controls the working state of the power tube in the DC converter based on the target control strategy.

[0170] In this step, the operating state includes either the on or off state, and the on-time of the power transistor in the on state during the switching cycle. The target control strategy refers to the control scheme for each power transistor in the DC-DC converter, which can be determined based on the DC-DC converter topology and the type of target command.

[0171] The specific process of controlling the operating state of the power transistors in the DC-DC converter based on the target control strategy has been explained in detail above and will not be repeated here.

[0172] During the research and development process, the inventors discovered that in related technologies, when the system detects a command to prohibit charging / discharging, the circuit between the energy storage battery and the DC bus is usually cut off by a relay or the charging / discharging current limit is set to 0A by the software current limiting strategy of the controller to achieve prohibition of charging and discharging. However, the above methods have a delay in the process of the relay closing and opening, which cannot meet the requirements of rapid discharge and is difficult to achieve stable control of prohibition of charging and discharging.

[0173] In this application, when the system detects a charge / discharge prohibition command, stable charge / discharge prohibition control is achieved by controlling the operating timing of the power switching transistors of the DC-DC converter, thus avoiding overcharging / over-discharging of the energy storage battery and improving the safety of the energy storage system. The output mode of each power transistor in the DC-DC converter is optimized to control the conduction time of each power transistor, reducing the response delay during the charging / discharging process, thereby meeting the requirements of fast charging / discharging and ensuring the continuity of AC power supply.

[0174] According to the charging and discharging control method provided in the embodiments of this application, based on the topology of the DC-DC converter and the command to disable charging and / or discharging, the operating state of each power transistor in the DC-DC converter is controlled to effectively suppress the flow of charging / discharging current in the circuit, realize stable control to disable charging / discharging, and improve the safety of the energy storage system. At the same time, by optimizing the output mode of each power transistor in the DC-DC converter, the response delay during the charging / discharging process is reduced, thereby meeting the requirements of fast charging / discharging and ensuring the continuity of AC power supply.

[0175] The charge / discharge control method provided in this application can be executed by a charge / discharge control device. This application uses the example of a charge / discharge control device executing the charge / discharge control method to illustrate the charge / discharge control device provided in this application.

[0176] This application also provides a charge / discharge control device.

[0177] like Figure 31 As shown, the charge / discharge control device includes: a first processing module 3110 and a second processing module 3120.

[0178] The first processing module 3110 is configured to, in response to receiving the target instruction, determine a target control strategy based on a topology of the DC converter and a category of the target instruction; the topology comprises a non-isolated single-stage DC converter, an isolated single-stage DC converter, or a combined DC converter; and the category of the target instruction comprises a charging prohibition instruction and / or a discharging prohibition instruction.

[0179] The second processing module 3120 is configured to control a working state of a power tube in the DC converter based on the target control strategy; the working state comprises a conduction state or a disconnection state, and a conduction duration of the power tube in the conduction state within a switching period.

[0180] In some embodiments, the first processing module 3110 can be further configured to:

[0181] determine the target power tube to be adjusted based on the category of the target instruction and the topology;

[0182] determine the control strategy corresponding to the target power tube based on the topology.

[0183] In some embodiments, the first processing module 3110 can be further configured to:

[0184] in a case where the category of the target instruction is the charging prohibition instruction or the discharging prohibition instruction, and the topology is the non-isolated single-stage DC converter, determine a main power tube in the DC converter as the target power tube;

[0185] in a case where the category of the target instruction is the charging prohibition instruction and the discharging prohibition instruction, and the topology is the non-isolated single-stage DC converter, determine each power tube in the DC converter as the target power tube.

[0186] In some embodiments, the first processing module 3110 can be further configured to:

[0187] in a case where the topology is the non-isolated single-stage DC converter, determine that the control strategy corresponding to the target power tube is:

[0188] reduce the conduction duration of the target power tube until a first preset value is reached; and a conduction duration in a previous switching period is greater than a conduction duration in a next switching period.

[0189] In some embodiments, the first processing module 3110 can be further configured to:

[0190] in a case where the category of the target instruction is the charging prohibition instruction, and the topology is the isolated single-stage DC converter, determine each power tube in a bridge circuit connected to a DC bus in the DC converter as the target power tube;

[0191] In a case where the category of the target instruction is the forbidden charging instruction and the topology structure is the isolated single-stage DC converter, each power tube in the DC converter is determined as the target power tube.

[0192] In a case where the category of the target instruction is the forbidden charging instruction and the topology structure is the isolated single-stage DC converter, each power tube in the DC converter is determined as the target power tube.

[0193] In some embodiments, the first processing module 3110 can be further configured to:

[0194] In a case where the topology structure is the isolated single-stage DC converter, the control strategy corresponding to the target power tube is determined as:

[0195] The on duration of the target power tube is reduced, and the on duration of the target power tube is ensured to be less than the on duration of a first power tube corresponding to the target power tube in another bridge circuit in the DC converter in the same switching cycle.

[0196] In some embodiments, the first processing module 3110 can be further configured to:

[0197] In a case where the category of the target instruction is the forbidden charging instruction and the topology structure is the isolated single-stage DC converter, the other bridge circuit is the bridge circuit connected to the energy storage battery in the DC converter.

[0198] In a case where the category of the target instruction is the forbidden charging instruction and the topology structure is the isolated single-stage DC converter, the other bridge circuit is the bridge circuit connected to the energy storage battery in the DC converter.

[0199] In some embodiments, the first processing module 3110 can be further configured to:

[0200] In a case where the topology structure is the combined DC converter, the target control strategy is determined as:

[0201] Based on the single-type topology structure of the converter included in the combined DC converter and the category of the target instruction, at least one control strategy is selected from the control strategies corresponding to each single-type topology structure as the target control strategy, the selected at least one control strategy matches the single-type topology structure of at least one converter included in the combined DC converter, and the single-type topology structure includes a non-isolated single-stage DC converter or an isolated single-stage DC converter.

[0202] According to the charge and discharge control device provided in the embodiment of the present application, based on the topology structure of the DC converter and the no-charge and / or no-discharge instruction, the working state of each power tube in the DC converter is controlled, the flow of the charge / discharge current in the circuit is effectively inhibited, the stable no-charge / no-discharge control is realized, and the safety of the energy storage system is improved. Meanwhile, the outgoing wave mode of each power tube in the DC converter is optimized, the response delay in the charge / discharge process is reduced, the demand of fast charge / discharge is met, and the continuity of the power supply on the AC side is ensured.

[0203] The charge and discharge control device in the embodiment of the present application can be an electronic device or a component in an electronic device, for example, an integrated circuit or a chip. The electronic device can be a terminal or other devices except the terminal. For example, the electronic device can be a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted electronic device, a Mobile Internet Device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), and the like, and can also be a server, a Network Attached Storage (NAS), a personal computer (PC), a television (TV), a teller machine, or a self-service machine, and the like, and the embodiment of the present application is not limited in this regard.

[0204] The charge and discharge control device in the embodiment of the present application can be a device with an operating system. The operating system can be an Android operating system, an IOS operating system, or other possible operating systems, and the embodiment of the present application is not limited in this regard.

[0205] The charge and discharge control device provided in the embodiment of the present application can realize the method embodiment Figure 1 to Figure 30 The method embodiment realizes each process, and details are not repeated here to avoid repetition.

[0206] The embodiment of the present application further provides an energy storage system, which comprises an energy storage battery, a DC bus, a DC converter, and the charge and discharge control device provided in any of the above embodiments.

[0207] The DC converter is electrically connected with the energy storage battery and the DC bus, respectively; and the charge and discharge control device is electrically connected with the DC converter.

[0208] In some embodiments, the topology of the direct current converter includes a non-isolated single-stage direct current converter, an isolated single-stage direct current converter, or a combined direct current converter.

[0209] In this embodiment, the combined direct current converter can include a single or multiple non-isolated converters, a single or multiple isolated converters, and a single or multiple non-isolated converters connected in series with a single or multiple isolated converters.

[0210] In some embodiments, the connection between the input terminals of the combined direct current converter includes series or parallel connection, and the connection between the output terminals of the combined direct current converter includes series or parallel connection.

[0211] Table 1

[0212]

[0213] In this embodiment, the connection between the combined direct current converters is exemplified in Table 1. Table 1 includes 20 combinations and 20 connections of the combined direct current converters, which correspond to Figure 10 to Figure 29 respectively. It should be noted that the connection in the combined direct current converter includes but is not limited to the connection shown in Table 1.

[0214] In some embodiments, as Figure 32 shown in the figure, the electronic device 3200 further includes a processor 3201, a memory 3202, and a computer program stored in the memory 3202 and executable on the processor 3201. The program is executed by the processor 3201 to implement each process of the above charging and discharging control method embodiments and achieve the same technical effects. To avoid repetition, details are not described here.

[0215] It should be noted that the electronic device in the embodiments of the present application includes the mobile electronic device and the non-mobile electronic device described above.

[0216] The embodiments of the present application further provide a non-transitory computer readable storage medium having a computer program stored thereon. The computer program is executed by a processor to implement each process of the above charging and discharging control method embodiments and achieve the same technical effects. To avoid repetition, details are not described here.

[0217] The processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes a computer readable storage medium, such as a computer readable memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0218] The embodiment of the present application further provides a computer program product, comprising a computer program, which, when executed by a processor, implements the above charging and discharging control method.

[0219] The processor is the processor in the electronic device in the above embodiment. The readable storage medium comprises a computer readable storage medium, such as a computer readable only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0220] The embodiment of the present application further provides a chip, comprising a processor and a communication interface, wherein the communication interface is coupled with the processor, the processor is used to run programs or instructions, to implement each process of the above charging and discharging control method embodiment, and to achieve the same technical effects. To avoid repetition, details are not described herein.

[0221] It should be understood that the chip mentioned in the embodiment of the present application can also be referred to as a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0222] It should be noted that in this document, the terms "comprising", "containing" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to the order of performing the functions as shown or discussed, but can also include performing the functions in a substantially simultaneous manner or in reverse order, for example, the described method can be performed in an order different from that described, and various steps can be added, omitted or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0223] From the above description of the embodiments, those skilled in the art can clearly understand that the above embodiment method can be realized by means of software and necessary general hardware platform, of course, it can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk, etc.), and includes a plurality of instructions for making a terminal (which can be a mobile phone, computer, server or network equipment, etc.) execute the method described in each embodiment of the present application.

[0224] The embodiments of the present application are described above with reference to the drawings, but the present application is not limited to the specific embodiments described above, and the specific embodiments described above are merely illustrative, not restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, all of which belong to the protection of the present application.

[0225] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0226] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A charge and discharge control method characterized by comprising: The method comprises: In the case of receiving a target instruction, determining a target control strategy based on a topology of a direct current converter and a category of the target instruction; The topology comprises a non-isolated single-stage direct current converter, an isolated single-stage direct current converter or a combined direct current converter; and the category of the target instruction comprises a charging prohibition instruction and / or a discharging prohibition instruction; Based on the target control strategy, the working state of the power tube in the direct current converter is controlled; the working state comprises a conduction state or a disconnection state, and the conduction time length of the power tube in the conduction state in a switching cycle; The method comprises: Based on the category of the target instruction and the topology, a target power tube to be adjusted is determined; Based on the topology, a control strategy corresponding to the target power tube is determined.

2. The charge and discharge control method according to claim 1, characterized by, The method comprises: In the case that the category of the target instruction is the charging prohibition instruction or the discharging prohibition instruction, and the topology is the non-isolated single-stage direct current converter, a main power tube in the direct current converter is determined as the target power tube; In the case that the category of the target instruction is the charging prohibition instruction and the discharging prohibition instruction, and the topology is the non-isolated single-stage direct current converter, each power tube in the direct current converter is determined as the target power tube.

3. The charge and discharge control method according to claim 1, characterized by, The method comprises: In the case that the topology is the non-isolated single-stage direct current converter, it is determined that the control strategy corresponding to the target power tube is: The conduction time length of the target power tube is reduced until a first preset value is reached; wherein the conduction time length in a previous switching cycle is greater than the conduction time length in a next switching cycle.

4. The charge and discharge control method according to claim 1, characterized by, The method comprises: In the case that the category of the target instruction is the charging prohibition instruction, and the topology is the isolated single-stage direct current converter, each power tube in a bridge circuit connected with a direct current bus in the direct current converter is determined as the target power tube; In the case that the category of the target instruction is the discharging prohibition instruction, and the topology is the isolated single-stage direct current converter, each power tube in a bridge circuit connected with an energy storage battery in the direct current converter is determined as the target power tube; In the case that the category of the target instruction is the charging prohibition instruction and the discharging prohibition instruction, and the topology is the isolated single-stage direct current converter, each power tube in the direct current converter is determined as the target power tube.

5. The charge and discharge control method according to claim 1, characterized by, The method comprises: In the case that the topology is the isolated single-stage direct current converter, it is determined that the control strategy corresponding to the target power tube is: Reduce the on duration of the target power tube, and ensure that the on duration of the target power tube in the same switching cycle is less than the on duration of the first power tube corresponding to the target power tube in another bridge circuit in the DC converter.

6. The charging and discharging control method according to claim 5, wherein, when the category of the target instruction is the charging prohibition instruction and the topology structure is the isolated single-stage DC converter, the other bridge circuit is a bridge circuit connected with an energy storage battery in the DC converter. When the category of the target instruction is the discharging prohibition instruction and the topology structure is the isolated single-stage DC converter, the other bridge circuit is a bridge circuit connected with a DC bus in the DC converter. The method comprises:

7. The charge and discharge control method according to any one of claims 1 to 6, characterized by, When the topology structure is the combined DC converter, the target control strategy is determined as: Based on the single topology structure of the converter included in the combined DC converter and the category of the target instruction, at least one control strategy is selected from the control strategies corresponding to each single topology structure as the target control strategy, and the selected at least one control strategy matches the single topology structure of at least one converter included in the combined DC converter, and the single topology structure includes a non-isolated single-stage DC converter or an isolated single-stage DC converter. The method comprises:

8. A charge-discharge control device characterized by comprising: The first processing module is configured to determine a target control strategy based on the topology structure of the DC converter and the category of the target instruction when the target instruction is received. The topology structure includes a non-isolated single-stage DC converter, an isolated single-stage DC converter, or a combined DC converter, and the category of the target instruction includes a charging prohibition instruction and / or a discharging prohibition instruction. The second processing module is configured to control the working state of the power tube in the DC converter based on the target control strategy, and the working state includes a conduction state or a disconnection state, and the on duration of the power tube in the conduction state in a switching cycle. The first processing module is configured to: Determine a target power tube to be adjusted based on the category of the target instruction and the topology structure. Determine a control strategy corresponding to the target power tube based on the topology structure. The method comprises:

9. An energy storage system characterized by, An energy storage battery; A DC bus; A DC converter electrically connected with the energy storage battery and the DC bus respectively; The charging and discharging control device according to claim 8 is electrically connected with the DC converter. The topology structure of the DC converter includes a non-isolated single-stage DC converter, an isolated single-stage DC converter, or a combined DC converter.

10. The energy storage system of claim 9, wherein, The connection mode between the input ends of the combined DC converter includes series connection or parallel connection, and the connection mode between the output ends of the combined DC converter includes series connection or parallel connection.

11. The energy storage system of claim 10, wherein, The computer program is executed by a processor to implement the charging and discharging control method according to any one of claims 1-7.

12. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that, ​ 13. A computer program product comprising a computer program, characterized in that, The computer program, when executed by the processor, implements the charge and discharge control method according to any one of claims 1-7.

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