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CN-116995718-B - Battery control system and control method

CN116995718BCN 116995718 BCN116995718 BCN 116995718BCN-116995718-B

Abstract

The system comprises an SOC battery, a staggered Buck/Boost module, a CLLC resonant converter, a T-type three-level module and a controller, wherein the controller is used for determining a first given current value according to target generated power indicated by a power generation instruction, controlling the staggered 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, enabling the SOC battery to supply power to a power grid according to the target generated power, and determining a second given current value according to target electrolysis power provided by the power grid to the SOC battery, and controlling the staggered 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 and enable the SOC battery to carry out electrolysis.

Inventors

  • Mou Shujun

Assignees

  • 国家能源投资集团有限责任公司
  • 北京低碳清洁能源研究院

Dates

Publication Date
20260512
Application Date
20220426

Claims (10)

  1. 1. The control system of the battery is characterized by comprising an SOC battery, an interleaving Buck/Boost module, a CLLC resonant converter, a T-shaped three-level module and a controller, wherein the SOC battery is connected with a power grid through the interleaving Buck/Boost module, the CLLC resonant converter and the T-shaped three-level module in sequence; The controller is used for determining a first given current value according to the target power indicated by the power generation instruction under the condition that the power generation instruction is received, and controlling the staggered 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 power grid according to the target power generation power; The controller is used for determining a second given current value according to the target electrolytic power provided by the power grid to the SOC battery under the condition of receiving an electrolytic instruction, and controlling the staggered Buck/Boost module, the CLLC resonant converter and the T-shaped three-level module according to the second given current value so as to control the input current of the SOC battery and enable the SOC battery to carry out electrolytic hydrogen production.
  2. 2. The system of claim 1, wherein the controller is configured to increase a first preset current value according to a preset first current step in each first preset control period, obtain an updated first preset 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 preset current value until the output current of the SOC battery reaches the first preset current value.
  3. 3. The system of claim 2, wherein the controller is further configured to obtain an output power of the T-type three-level module, and if a difference between the output power and the target generated power is less than or equal to a first preset power threshold, take a current first preset current value as a first target 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 current value.
  4. 4. The system of claim 1, wherein the controller is configured to increase a second current value to be selected according to a preset second current step in each second preset control period, obtain an updated second current value to be selected, and control the interleaved Buck/Boost module, the CLLC resonant converter, and the T-type three-level module according to the updated second current value to be selected until the input current of the SOC battery reaches the second current value.
  5. 5. The system of claim 4, wherein the controller is further configured to obtain an input power of the interleaved Buck/Boost module, and to use a current second candidate given current value as a second target given current value if a difference between the input power and the target electrolytic power is less than or equal to a second preset power threshold, and to 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. 6. A control method of a battery, characterized by being applied to the control system of a battery according to any one of claims 1 to 5, the method comprising: Under the condition that a power generation instruction is received, determining a first given current value according to target power generation indicated by the power generation instruction, and controlling an interleaving Buck/Boost module, a CLLC resonant converter and a T-type three-level module according to the first given current value so as to control the output current of an SOC battery, so that the SOC battery supplies power to the power grid according to the target power generation; under the condition that an electrolysis instruction is received, a second given current value is determined according to target electrolysis power provided by a power grid to the SOC battery, and the staggered Buck/Boost module, the CLLC resonant converter and the T-type three-level module are controlled according to the second given current value so as to control the input current of the SOC battery, so that the SOC battery is subjected to electrolytic hydrogen production.
  7. 7. The method of claim 6, wherein controlling the interleaved Buck/Boost module, the CLLC resonant converter, and the T-type three-level module according to the first given current value comprises: In each first preset control period, increasing a first preset current value according to a preset first current step length to obtain an updated first preset current value, and controlling the staggered Buck/Boost module, the CLLC resonant converter and the T-type three-level module according to the updated first preset current value until the output current of the SOC battery reaches the first preset current value.
  8. 8. The method of claim 7, wherein 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 comprises: And obtaining the output power of the T-shaped three-level module, taking the current first preset given current value as a first target given current value under the condition that the difference value between the output power and the target generated power is smaller than or equal to a first preset power threshold value, and controlling the staggered Buck/Boost module, the CLLC resonant converter and the T-shaped three-level module according to the first target given current value.
  9. 9. The method of claim 6, wherein said controlling the interleaved Buck/Boost module, the CLLC resonant converter, and the T-type three-level module according to the second given current value comprises: In each second preset control period, increasing a second preset current value to obtain an updated second preset current value to be selected according to a preset second current step, and controlling the staggered Buck/Boost module, the CLLC resonant converter and the T-shaped three-level module according to the updated second preset current value until the input current of the SOC battery reaches the second preset current value.
  10. 10. The method of claim 9, wherein said 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 comprises: And acquiring the input power of the staggered Buck/Boost module, taking the current second preset current value to be selected as a second target preset current value under the condition that the difference value between the input power and the target electrolytic power is smaller than or equal to a second preset power threshold value, and controlling the staggered Buck/Boost module, the CLLC resonant converter and the T-shaped three-level module according to the second target preset current value.

Description

Battery control system and control method Technical Field The disclosure relates to the technical field of power electronics, and in particular relates to a control system and a control method of a battery. Background SOC (Solid Oxide Cell, chinese: high temperature) cells can operate in SOEC (English: solid Oxide Fuel Cell, chinese: solid Oxide fuel Cell) mode, realize grid-connected power generation by using hydrogen as fuel, and can operate in SOEC (English: solid Oxide Electrolysis Cell, chinese: solid Oxide electrolytic Cell) mode, and realize hydrogen production by electrolysis of water through electric energy provided by a power grid. The SOC battery has such bidirectional reversible operation capability, and thus is widely used in the aspects of grid auxiliary regulation and the like. In the bidirectional reversible operation of the SOC battery, the SOC battery is often required to operate in a wide voltage range and a wide power range, however, it is generally difficult to meet the requirement of the SOC battery for wide voltage range adjustment when the bidirectional reversible operation of the SOC battery is currently implemented, and it is difficult to maintain the operation efficiency of the SOC battery in the wide power range, which affects the stability of the operation of the SOC battery. Disclosure of Invention In order to solve the problems in the related art, the present disclosure provides a control system and a control method of a battery. In order to achieve the above object, according to a first aspect of embodiments of the present disclosure, there is provided a control system for a battery, where the system includes an SOC battery, an interleaved Buck/Boost module, a CLLC resonant converter, a T-type three-level module, and a controller, where the SOC battery is connected to a power grid through the interleaved Buck/Boost module, the CLLC resonant converter, and the T-type three-level module in sequence, and the controller is connected to the interleaved Buck/Boost module, the CLLC resonant converter, and the T-type three-level module, respectively; The controller is used for determining a first given current value according to the target power indicated by the power generation instruction under the condition that the power generation instruction is received, and controlling the staggered 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 power grid according to the target power generation power; The controller is used for determining a second given current value according to the target electrolytic power provided by the power grid to the SOC battery under the condition of receiving an electrolytic instruction, and controlling the staggered Buck/Boost module, the CLLC resonant converter and the T-shaped three-level module according to the second given current value so as to control the input current of the SOC battery and enable the SOC battery to carry out electrolytic hydrogen production. Optionally, the controller is configured to increase a first preset current value according to a preset first current step in each first preset control period, obtain an updated first preset 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 preset current value until the output current of the SOC battery reaches the first preset current value. Optionally, the controller is further configured to obtain an output power of the T-type three-level module, and when a difference between the output power and the target generated power is less than or equal to a first preset power threshold, take a current first preset current value as a first target preset 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 preset current value. Optionally, the controller is configured to increase a second preset current value to be selected according to a preset second current step in each second preset control period, obtain an updated second preset current value to be selected, and control the interleaved Buck/Boost module, the CLLC resonant converter and the T-type three-level module according to the updated second preset current value until the input current of the SOC battery reaches the second preset current value. Optionally, the controller is further configured to obtain an input power of the interleaved Buck/Boost module, and when a difference between the input power and the target electrolytic power is less than or equal to a second preset power threshold, use a current second to-be-selected given current value as a second target given current value, and control the interleaved Buck/Boost module, the CLLC resonant converter, and the