Control system and control method for a battery

Abstract

The present disclosure relates to a battery control system and method, which comprises an SOC battery, an interleaved Buck / Boost module, a CLLLC resonant converter, a T-type three-level module and a controller, the controller is configured to determine a first given current value according to a target power generation indicated by a power generation instruction, and control the interleaved Buck / Boost module, the CLLLC resonant converter and the T-type three-level module according to the first given current value to control the output current of the SOC battery, so that the SOC battery supplies power to the grid according to the target power generation; the controller is configured to determine a second given current value according to a target electrolysis power provided by the grid to the SOC battery, and control the interleaved Buck / Boost module, the CLLLC resonant converter and the T-type three-level module according to the second given current value to control the input current of the SOC battery, so that the SOC battery performs electrolysis to produce hydrogen.

Description

Technical Field

[0001] This disclosure relates to the field of power electronics technology, and more specifically, to a control system and control method for a battery. Background Technology

[0002] SOC (Solid Oxide Cell) batteries can operate in both SOFC (Solid Oxide Fuel Cell) mode, using hydrogen as fuel to generate electricity in a grid-connected manner, and SOEC (Solid Oxide Electrolysis Cell) mode, using electricity supplied by the grid to electrolyze water to produce hydrogen. Due to this bidirectional reversible operation capability, SOC batteries are widely used in grid auxiliary regulation and other applications.

[0003] When SOC batteries are operating in a bidirectional reversible manner, they often need to operate within a wide voltage range and a wide power range. However, current methods for achieving bidirectional reversible operation of SOC batteries often fail to meet the requirements of SOC batteries for wide voltage range regulation and to maintain the operating efficiency of SOC batteries within a wide power range, which affects the stability of SOC battery operation. Summary of the Invention

[0004] To address the problems existing in related technologies, this disclosure provides a battery control system and control method.

[0005] To achieve the above objectives, according to a first aspect of the present disclosure, a battery control system is provided. The system includes a SOC battery, an interleaved Buck / Boost module, a CLLC resonant converter, a T-type three-level module, and a controller. The SOC battery is connected to the power grid sequentially through the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module. The controller is connected to the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module respectively.

[0006] The controller is configured to, upon receiving a power generation command, determine a first given current value based on the target power generation indicated by the power generation command, and control the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module based on the first given current value, so as to control the output current of the SOC battery and enable the SOC battery to supply power to the grid according to the target power generation.

[0007] The controller is configured to, upon receiving an electrolysis command, determine a second given current value based on the target electrolysis power supplied to the SOC battery by the power grid, and control the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module based on the second given current value, so as to control the input current of the SOC battery and enable the SOC battery to perform electrolysis to produce hydrogen.

[0008] Optionally, the controller is configured to increase the first candidate given current value by a preset first current step size in each first preset control cycle to obtain an updated first candidate given current value, and control the interleaved Buck / Boost module, the CLLC resonant converter and the T-type three-level module according to the updated first candidate given current value until the output current of the SOC battery reaches the first given current value.

[0009] Optionally, the controller is further configured to acquire the output power of the T-type three-level module, and if the difference between the output power and the target power generation is less than or equal to a first preset power threshold, use the current first candidate given current value as the first target given current value, and control the interleaved Buck / Boost module, the CLLC resonant converter and the T-type three-level module according to the first target given current value.

[0010] Optionally, the controller is configured to increase the second candidate given current value by a preset second current step size in each second preset control cycle to obtain an updated second candidate given current value, and control the interleaved Buck / Boost module, the CLLC resonant converter and the T-type three-level module according to the updated second candidate given current value until the input current of the SOC battery reaches the second given current value.

[0011] Optionally, the controller is further configured to acquire the input power of the interleaved Buck / Boost module, and if the difference between the input power and the target electrolysis power is less than or equal to a second preset power threshold, use the current second candidate given current value as the second target given current value, and control the interleaved Buck / Boost module, the CLLC resonant converter and the T-type three-level module according to the second target given current value.

[0012] According to a second aspect of the present disclosure, a battery control method is provided, applied to the battery control system described in the first aspect, the method comprising:

[0013] Upon receiving a power generation command, a first given current value is determined based on the target power generation indicated by the power generation command. Based on the first given current value, the interleaved Buck / Boost module, CLLC resonant converter, and T-type three-level module are controlled to control the output current of the SOC battery, so that the SOC battery supplies power to the grid according to the target power generation.

[0014] Upon receiving an electrolysis command, a second given current value is determined based on the target electrolysis power supplied by the power grid to the SOC battery. Based on the second given current value, the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module are controlled to control the input current of the SOC battery, enabling the SOC battery to perform electrolysis to produce hydrogen.

[0015] Optionally, controlling the interleaved Buck / Boost module, CLLC resonant converter, and T-type three-level module according to the first given current value includes:

[0016] In each first preset control cycle, the first candidate given current value is increased according to the preset first current step size to obtain the updated first candidate given current value. The interleaved Buck / Boost module, the CLLC resonant converter and the T-type three-level module are controlled according to the updated first candidate given current value until the output current of the SOC battery reaches the first given current value.

[0017] Optionally, the step of controlling the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module according to the first given current value further includes:

[0018] The output power of the T-type three-level module is obtained, and if the difference between the output power and the target power generation is less than or equal to a first preset power threshold, the current first candidate given current value is taken as the first target given current value, and the interleaved Buck / Boost module, the CLLC resonant converter and the T-type three-level module are controlled according to the first target given current value.

[0019] Optionally, controlling the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module according to the second given current value includes:

[0020] In each second preset control cycle, the second candidate given current value is increased according to the preset second current step size to obtain the updated second candidate given current value. The interleaved Buck / Boost module, the CLLC resonant converter and the T-type three-level module are controlled according to the updated second candidate given current value until the input current of the SOC battery reaches the second given current value.

[0021] Optionally, controlling the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module according to the second given current value further includes:

[0022] The input power of the interleaved Buck / Boost module is obtained, and if the difference between the input power and the target electrolysis power is less than or equal to a second preset power threshold, the current second candidate given current value is taken as the second target given current value, and the interleaved Buck / Boost module, the CLLC resonant converter and the T-type three-level module are controlled according to the second target given current value.

[0023] Through the above technical solution, the battery control system of this disclosure includes a SOC battery, an interleaved Buck / Boost module, a CLLC resonant converter, a T-type three-level module, and a controller. The controller is used to determine a first given current value according to the target power output indicated by the received power generation command, and to control the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module according to the first given current value, so as to control the output current of the SOC battery, so that the SOC battery supplies power to the grid according to the target power output. The controller also determines a second given current value according to the target electrolysis power supplied to the SOC battery by the grid, and controls the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module according to the second given current value, so as to control the input current of the SOC battery, so that the SOC battery can perform electrolysis to produce hydrogen. The battery control system disclosed herein employs a three-level power converter consisting of interleaved Buck / Boost modules, a CLLC resonant converter, and a T-type three-level module to achieve bidirectional reversible operation of the SOC battery. Simultaneously, the interleaved Buck / Boost modules and CLLC resonant converter can meet the SOC battery's requirement for wide voltage range regulation and maintain the SOC battery's operating efficiency over a wide power range, thereby improving the stability of the SOC battery's operation.

[0024] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0026] Figure 1 This is a block diagram illustrating a battery control system according to an exemplary embodiment;

[0027] Figure 2 This is a schematic diagram of the structure of a battery control system according to an exemplary embodiment;

[0028] Figure 3 This is a flowchart illustrating a battery control method according to an exemplary embodiment. Detailed Implementation

[0029] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0030] Figure 1 This is a block diagram illustrating a battery control system according to an exemplary embodiment. Figure 1 As shown, the system 100 includes a SOC battery 101, an interleaved Buck / Boost module 102, a CLLC resonant converter 103, a T-type three-level module 104, and a controller 105. The SOC battery 101 is connected to the power grid 200 sequentially through the interleaved Buck / Boost module 102, the CLLC resonant converter 103, and the T-type three-level module 104. The controller 105 is connected to the interleaved Buck / Boost module 102, the CLLC resonant converter 103, and the T-type three-level module 104.

[0031] The controller 105 is used to determine a first given current value according to the target power output indicated by the power generation command when a power generation command is received, and to control the interleaved Buck / Boost module 102, CLLC resonant converter 103 and T-type three-level module 104 according to the first given current value, so as to control the output current of the SOC battery 101 and enable the SOC battery 101 to supply power to the grid 200 according to the target power output.

[0032] For example, the SOC battery 101 has a wide voltage range during bidirectional reversible operation. However, SOC batteries 101 from different manufacturers with the same power output exhibit significant voltage differences due to variations in the area of ​​individual cells. Furthermore, when the SOC battery 101 is used for grid auxiliary regulation (e.g., for peak shaving and valley filling in power systems), it often needs to operate within a wide power range and maintain high operating efficiency across this range. To achieve bidirectional reversible operation of the SOC battery 101, meet its wide voltage range regulation requirements, and maintain its operating efficiency over a wide power range, a battery control system 100 can be established, consisting of the SOC battery 101, an interleaved Buck / Boost module 102, a CLLC resonant converter 103, a T-type three-level module 104, and a controller 105.

[0033] The interleaved Buck / Boost module 102 is connected to the CLLC resonant converter 103 via a low-voltage DC bus, and the CLLC resonant converter 103 is connected to the T-type three-level module 104 via a high-voltage DC bus. The interleaved Buck / Boost module 102, CLLC resonant converter 103, and T-type three-level module 104 constitute a three-stage power converter. In this power converter, the interleaved Buck / Boost module 102 is used to achieve wide voltage range regulation (e.g., voltage regulation within a 4-5x range). Simultaneously, using the interleaved Buck / Boost module 102 can reduce the output current ripple and input current ripple of the SOC battery 101, thereby suppressing the performance degradation of the SOC battery 101 and extending its lifespan. The CLLC resonant converter 103 is used to achieve wide voltage range regulation and electrical isolation, and it needs to operate at its resonant frequency to achieve high efficiency. The T-type three-level module 104 serves as the interface between the power converter and the power grid 200, enabling inversion or rectification. The combination of the interleaved Buck / Boost module 102 and the CLLC resonant converter 103 allows the power converter to be regulated over a wide voltage and power range while maintaining high efficiency. This power converter enables bidirectional reversible operation of the SOC battery 101, ensuring high operating efficiency within its power range. Furthermore, this power converter boasts advantages such as high frequency, small size, light weight, high power density, and high conversion efficiency.

[0034] When the SOC battery 101 operates in SOFC mode for grid-connected power generation, the grid 200 can send a power generation command to the controller 105. This command includes the target power generation power that the grid 200 requires the SOC battery 101 to achieve during grid-connected power generation. After receiving the power generation command, the controller 105 can determine a first given current value based on the target power generation power, and control the interleaved Buck / Boost module 102, CLLC resonant converter 103, and T-type three-level module 104 based on the first given current value. At this time, the interleaved Buck / Boost module 102 boosts the battery voltage of the SOC battery 101, adjusts the battery voltage of the SOC battery 101 to the low-voltage DC bus voltage, and controls the output current of the SOC battery 101 (i.e., controls the output current of the stack) so that the output current of the SOC battery 101 gradually changes to the first given current value. The CLLC resonant converter 103 can boost the low-voltage DC bus voltage to the high-voltage DC bus voltage. Simultaneously, the CLLC resonant converter 103 also provides electrical isolation and maintains the stability of the DC voltage between itself and the interleaved Buck / Boost module 102. The T-type three-level module 104 converts the high-voltage DC bus DC voltage into the three-phase AC voltage required by the power grid, enabling the SOC battery 101 to supply power to the grid 200 according to the target power output. The T-type three-level module 104 also controls and maintains the steady-state operation of the high-voltage DC bus DC voltage.

[0035] The controller 105 is used to determine a second given current value based on the target electrolysis power provided by the grid 200 to the SOC battery 101 upon receiving an electrolysis command, and to control the interleaved Buck / Boost module 102, CLLC resonant converter 103 and T-type three-level module 104 based on the second given current value, so as to control the input current of the SOC battery 101 and enable the SOC battery 101 to perform electrolysis to produce hydrogen.

[0036] For example, when the SOC battery 101 operates in SOEC mode to produce hydrogen through water electrolysis, the grid 200 can send an electrolysis command to the controller 105. This electrolysis command includes the target electrolysis power that the grid 200 can provide to the SOC battery 101 for water electrolysis to produce hydrogen. After receiving the electrolysis command, the controller 105 can determine a second given current value based on the target electrolysis power, and control the interleaved Buck / Boost module 102, the CLLC resonant converter 103, and the T-type three-level module 104 based on the second given current value.

[0037] At this time, the T-type three-level module 104 can convert the three-phase AC voltage provided by the power grid into a high-voltage DC bus DC voltage. Simultaneously, the T-type three-level module 104 is also used to control and achieve a steady-state operation of the high-voltage DC bus DC voltage. The CLLC resonant converter 103 can step down the high-voltage DC bus voltage to a low-voltage DC bus voltage. The CLLC resonant converter 103 also provides electrical isolation and maintains the stability of the DC voltage between itself and the interleaved Buck / Boost module 102. The interleaved Buck / Boost module 102 steps down the low-voltage DC bus voltage, adjusting it to the battery voltage of the SOC battery 101, and controls the input current of the SOC battery 101 (i.e., the input current of the control stack) to gradually change to a second given current value, so that the SOC battery 101 can use the electrical energy provided by the power grid 200 to electrolyze and produce hydrogen.

[0038] It should be noted that, in one feasible scenario, the specific configuration of the battery control system 100 can be as follows: Figure 2 As shown ( Figure 2 The switching transistor in the circuit is turned on and off under the control of the controller 105, but Figure 2 This is merely an example illustrating the structure of the battery control system 100, and this disclosure does not specifically limit the structure of the battery control system 100.

[0039] In summary, the battery control system of this disclosure includes a SOC battery, an interleaved Buck / Boost module, a CLLC resonant converter, a T-type three-level module, and a controller. The controller is used to determine a first given current value based on the target power output indicated by the received power generation command, and to control the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module based on the first given current value to control the output current of the SOC battery, so that the SOC battery supplies power to the grid according to the target power output. The controller also determines a second given current value based on the target electrolysis power supplied to the SOC battery by the grid, and to control the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module based on the second given current value to control the input current of the SOC battery, so that the SOC battery can perform electrolysis to produce hydrogen. The battery control system disclosed herein employs a three-level power converter consisting of interleaved Buck / Boost modules, a CLLC resonant converter, and a T-type three-level module to achieve bidirectional reversible operation of the SOC battery. Simultaneously, the interleaved Buck / Boost modules and CLLC resonant converter can meet the SOC battery's requirement for wide voltage range regulation and maintain the SOC battery's operating efficiency over a wide power range, thereby improving the stability of the SOC battery's operation.

[0040] Optionally, the controller 105 is configured to increase the first candidate given current value by a preset first current step size in each first preset control cycle to obtain an updated first candidate given current value, and control the interleaved Buck / Boost module 102, CLLC resonant converter 103 and T-type three-level module 104 according to the updated first candidate given current value until the output current of the SOC battery 101 reaches the first given current value.

[0041] For example, when the SOC battery 101 operates in SOFC mode for grid-connected power generation, in order to ensure the stability of the SOC battery 101 in SOFC mode, slow down the degradation of the SOC battery 101, and extend the life of the SOC battery 101, current control of the SOC battery 101 is required. In SOFC mode, the output current of the SOC battery 101 is controlled by the interleaved Buck / Boost module 102. In order to reduce the impact on the SOC battery 101, the controller 105 can first set an initial first candidate given current value (the initial first candidate given current value can be 0), and in each first preset control cycle, increase the first candidate given current value according to a preset first current step size to obtain an updated first candidate given current value. Then the controller 105 can control the interleaved Buck / Boost module 102, CLLC resonant converter 103 and T-type three-level module 104 according to the updated first candidate given current value. After the control is completed, it enters the next first preset control cycle and repeats the above steps until the output current of the SOC battery 101 reaches the first given current value.

[0042] It should be noted that in each first preset control cycle, the process of increasing the first candidate given current value according to the first current step size is actually not to directly control according to the first given current value, but to first give a first candidate given current value for control, and control the first candidate given current value to gradually change to the first given current value at a certain slope, so as to control the output current of the SOC battery 101 to steadily climb at a certain slope, thereby reducing the impact on the SOC battery 101.

[0043] Furthermore, the controller 105 is also used to acquire the output power of the T-type three-level module 104, and when the difference between the output power and the target power generation is less than or equal to a first preset power threshold, to take the current first candidate given current value as the first target given current value, and to control the interleaved Buck / Boost module 102, CLLC resonant converter 103 and T-type three-level module 104 according to the first target given current value.

[0044] For example, when the SOC battery 101 operates in SOFC mode for grid-connected power generation, the controller 105 generally receives a power generation command that includes the target power generation. Therefore, it is also necessary to control the output power of the T-type three-level module 104 to change according to the power generation command of the grid 200 while simultaneously achieving stable ramp-up control of the output current of the SOC battery 101. That is, power hysteresis control needs to be implemented. Specifically, the controller 105 can obtain the output power of the T-type three-level module 104 after a certain first preset control cycle. When the difference between the output power and the target power generation is less than or equal to the first preset power threshold (at this time, it is equivalent to the output power of the T-type three-level module 104 reaching the target power generation), the controller 105 takes the current first candidate given current value as the first target given current value (that is, keeps the first candidate given current value set in the current first preset control cycle unchanged), and controls the interleaved Buck / Boost module 102, CLLC resonant converter 103 and T-type three-level module 104 according to the first target given current value. In addition, if the first preset control cycle and the first current step size are set to be small, the power response of the system can still be maintained even if there is a certain lag in power detection.

[0045] Optionally, the controller 105 is configured to increase the second candidate given current value according to a preset second current step size in each second preset control cycle to obtain an updated second candidate given current value, and control the interleaved Buck / Boost module 102, CLLC resonant converter 103 and T-type three-level module 104 according to the updated second candidate given current value until the input current of the SOC battery 101 reaches the second given current value.

[0046] For example, when the SOC battery 101 operates in SOEC mode for water electrolysis to produce hydrogen, in order to ensure the stability of the SOC battery 101 in SOEC mode, slow down the degradation of the SOC battery 101, and extend the service life of the SOC battery 101, current control of the SOC battery 101 is also required. In SOEC mode, the input current of the SOC battery 101 is controlled by the interleaved Buck / Boost module 102. In order to reduce the impact on the SOC battery 101, the controller 105 can first set an initial second candidate given current value (the initial second candidate given current value can be 0), and in each second preset control cycle, increase the second candidate given current value according to the preset second current step size to obtain the updated second candidate given current value. Then the controller 105 can control the interleaved Buck / Boost module 102, CLLC resonant converter 103 and T-type three-level module 104 according to the updated second candidate given current value. After the control is completed, it enters the next second preset control cycle and repeats the above steps until the input current of the SOC battery 101 reaches the second given current value.

[0047] It should be noted that in each second preset control cycle, the process of increasing the second candidate given current value according to the second current step size is actually not to directly control according to the second given current value, but to first give a second candidate given current value for control, and control the second candidate given current value to gradually change to the second given current value at a certain slope, so as to control the input current of the SOC battery 101 to rise steadily at a certain slope, thereby reducing the impact on the SOC battery 101.

[0048] Furthermore, the controller 105 is also used to acquire the input power of the interleaved Buck / Boost module 102, and when the difference between the input power and the target electrolysis power is less than or equal to a second preset power threshold, to take the current second candidate given current value as the second target given current value, and to control the interleaved Buck / Boost module 102, the CLLC resonant converter 103 and the T-type three-level module 104 according to the second target given current value.

[0049] For example, when the SOC battery 101 operates in SOEC mode for water electrolysis to produce hydrogen, the controller 105 generally receives an electrolysis command that includes the target electrolysis power. Therefore, it is also necessary to control the input power of the interleaved Buck / Boost module 102 according to the electrolysis command of the grid 200 while simultaneously achieving stable ramp-up control of the input current of the SOC battery 101. That is, power hysteresis control needs to be implemented. Specifically, the controller 105 can acquire the input power of the interleaved Buck / Boost module 102 after a certain second preset control cycle. When the difference between the input power and the target electrolysis power is less than or equal to the first preset power threshold (at which point it is equivalent to the input power of the interleaved Buck / Boost module 102 reaching the target electrolysis power), the controller 105 takes the current second candidate given current value as the second target given current value (that is, keeps the second candidate given current value set in the current second preset control cycle unchanged), and controls the interleaved Buck / Boost module 102, CLLC resonant converter 103, and T-type three-level module 104 according to the second target given current value. In addition, if the second preset control cycle and the first current step size are set to be small, the power response of the system can still be maintained even if there is a certain lag in power detection.

[0050] In summary, the battery control system of this disclosure includes a SOC battery, an interleaved Buck / Boost module, a CLLC resonant converter, a T-type three-level module, and a controller. The controller is used to determine a first given current value based on the target power output indicated by the received power generation command, and to control the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module based on the first given current value to control the output current of the SOC battery, so that the SOC battery supplies power to the grid according to the target power output. The controller also determines a second given current value based on the target electrolysis power supplied to the SOC battery by the grid, and to control the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module based on the second given current value to control the input current of the SOC battery, so that the SOC battery can perform electrolysis to produce hydrogen. The battery control system disclosed herein employs a three-level power converter consisting of interleaved Buck / Boost modules, a CLLC resonant converter, and a T-type three-level module to achieve bidirectional reversible operation of the SOC battery. Simultaneously, the interleaved Buck / Boost modules and CLLC resonant converter can meet the SOC battery's requirement for wide voltage range regulation and maintain the SOC battery's operating efficiency over a wide power range, thereby improving the stability of the SOC battery's operation.

[0051] Figure 3 This is a flowchart illustrating a battery control method according to an exemplary embodiment. Figure 3As shown, the control system for the battery applied in any of the above embodiments may include the following steps:

[0052] Step 201: Upon receiving a power generation command, determine a first given current value based on the target power generation indicated by the power generation command, and control the interleaved Buck / Boost module, CLLC resonant converter, and T-type three-level module based on the first given current value to control the output current of the SOC battery so that the SOC battery supplies power to the grid according to the target power generation.

[0053] Step 202: Upon receiving the electrolysis command, determine the second given current value based on the target electrolysis power supplied to the SOC battery by the power grid, and control the interleaved Buck / Boost module, CLLC resonant converter, and T-type three-level module based on the second given current value to control the input current of the SOC battery so that the SOC battery can perform electrolysis to produce hydrogen.

[0054] Alternatively, step 201 can be implemented in the following way:

[0055] In each first preset control cycle, the first candidate given current value is increased according to the preset first current step size to obtain the updated first candidate given current value. The interleaved Buck / Boost module, CLLC resonant converter and T-type three-level module are controlled according to the updated first candidate given current value until the output current of the SOC battery reaches the first given current value.

[0056] Alternatively, step 201 can also be implemented in the following ways:

[0057] The output power of the T-type three-level module is obtained, and if the difference between the output power and the target power generation is less than or equal to the first preset power threshold, the current first candidate given current value is taken as the first target given current value, and the interleaved Buck / Boost module, CLLC resonant converter and T-type three-level module are controlled according to the first target given current value.

[0058] Alternatively, step 202 can be implemented in the following way:

[0059] In each second preset control cycle, the second candidate given current value is increased according to the preset second current step size to obtain the updated second candidate given current value. The interleaved Buck / Boost module, CLLC resonant converter and T-type three-level module are controlled according to the updated second candidate given current value until the input current of the SOC battery reaches the second given current value.

[0060] Alternatively, step 202 can also be implemented in the following ways:

[0061] The input power of the interleaved Buck / Boost module is obtained, and if the difference between the input power and the target electrolysis power is less than or equal to the second preset power threshold, the current second candidate given current value is taken as the second target given current value, and the interleaved Buck / Boost module, CLLC resonant converter and T-type three-level module are controlled according to the second target given current value.

[0062] In summary, the battery control system of this disclosure includes a SOC battery, an interleaved Buck / Boost module, a CLLC resonant converter, a T-type three-level module, and a controller. The controller is used to determine a first given current value based on the target power output indicated by the received power generation command, and to control the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module based on the first given current value to control the output current of the SOC battery, so that the SOC battery supplies power to the grid according to the target power output. The controller also determines a second given current value based on the target electrolysis power supplied to the SOC battery by the grid, and to control the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module based on the second given current value to control the input current of the SOC battery, so that the SOC battery can perform electrolysis to produce hydrogen. The battery control system disclosed herein employs a three-level power converter consisting of interleaved Buck / Boost modules, a CLLC resonant converter, and a T-type three-level module to achieve bidirectional reversible operation of the SOC battery. Simultaneously, the interleaved Buck / Boost modules and CLLC resonant converter can meet the SOC battery's requirement for wide voltage range regulation and maintain the SOC battery's operating efficiency over a wide power range, thereby improving the stability of the SOC battery's operation.

[0063] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0064] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0065] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A battery control system, characterized in that, The system includes a SOC battery, an interleaved Buck / Boost module, a CLLC resonant converter, a T-type three-level module, and a controller. The SOC battery is connected to the power grid in sequence through the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module. The controller is connected to the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module. The controller is configured to, upon receiving a power generation command, determine a first given current value based on the target power generation indicated by the power generation command, and control the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module based on the first given current value, so as to control the output current of the SOC battery and enable the SOC battery to supply power to the grid according to the target power generation. The controller is configured to, upon receiving an electrolysis command, determine a second given current value based on the target electrolysis power supplied to the SOC battery by the power grid, and control the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module based on the second given current value, so as to control the input current of the SOC battery and enable the SOC battery to perform electrolysis to produce hydrogen.

2. The system according to claim 1, characterized in that, The controller is configured to increase the first candidate given current value by a preset first current step size in each first preset control cycle to obtain an updated first candidate given current value, and control the interleaved Buck / Boost module, the CLLC resonant converter and the T-type three-level module according to the updated first candidate given current value until the output current of the SOC battery reaches the first given current value.

3. The system according to claim 2, characterized in that, The controller is further configured to acquire the output power of the T-type three-level module, and when the difference between the output power and the target power generation is less than or equal to a first preset power threshold, use the current first candidate given current value as the first target given current value, and control the interleaved Buck / Boost module, the CLLC resonant converter and the T-type three-level module according to the first target given current value.

4. The system according to claim 1, characterized in that, The controller is configured to increase the second candidate given current value by a preset second current step size in each second preset control cycle to obtain an updated second candidate given current value, and control the interleaved Buck / Boost module, the CLLC resonant converter and the T-type three-level module according to the updated second candidate given current value until the input current of the SOC battery reaches the second given current value.

5. The system according to claim 4, characterized in that, The controller is further configured to acquire the input power of the interleaved Buck / Boost module, and when the difference between the input power and the target electrolysis power is less than or equal to a second preset power threshold, use the current second candidate given current value as the second target given current value, and control the interleaved Buck / Boost module, the CLLC resonant converter and the T-type three-level module according to the second target given current value.

6. A method for controlling a battery, characterized in that, A control system applied to the battery according to any one of claims 1-5, the method comprising: Upon receiving a power generation command, a first given current value is determined based on the target power generation indicated by the power generation command. Based on the first given current value, the interleaved Buck / Boost module, CLLC resonant converter, and T-type three-level module are controlled to control the output current of the SOC battery, so that the SOC battery supplies power to the grid according to the target power generation. Upon receiving an electrolysis command, a second given current value is determined based on the target electrolysis power supplied by the power grid to the SOC battery. Based on the second given current value, the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module are controlled to control the input current of the SOC battery, enabling the SOC battery to perform electrolysis to produce hydrogen.

7. The method according to claim 6, characterized in that, The control of the interleaved Buck / Boost module, CLLC resonant converter, and T-type three-level module based on the first given current value includes: In each first preset control cycle, the first candidate given current value is increased according to the preset first current step size to obtain the updated first candidate given current value. The interleaved Buck / Boost module, the CLLC resonant converter and the T-type three-level module are controlled according to the updated first candidate given current value until the output current of the SOC battery reaches the first given current value.

8. The method according to claim 7, characterized in that, The control of the interleaved Buck / Boost module, CLLC resonant converter, and T-type three-level module based on the first given current value also includes: The output power of the T-type three-level module is obtained, and if the difference between the output power and the target power generation is less than or equal to a first preset power threshold, the current first candidate given current value is taken as the first target given current value, and the interleaved Buck / Boost module, the CLLC resonant converter and the T-type three-level module are controlled according to the first target given current value.

9. The method according to claim 6, characterized in that, The step of controlling the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module according to the second given current value includes: In each second preset control cycle, the second candidate given current value is increased according to the preset second current step size to obtain the updated second candidate given current value. The interleaved Buck / Boost module, the CLLC resonant converter and the T-type three-level module are controlled according to the updated second candidate given current value until the input current of the SOC battery reaches the second given current value.

10. The method according to claim 9, characterized in that, The step of controlling the interleaved Buck / Boost module, the CLLC resonant converter, and the T-type three-level module according to the second given current value further includes: The input power of the interleaved Buck / Boost module is obtained, and if the difference between the input power and the target electrolysis power is less than or equal to a second preset power threshold, the current second candidate given current value is taken as the second target given current value, and the interleaved Buck / Boost module, the CLLC resonant converter and the T-type three-level module are controlled according to the second target given current value.

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