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CN-121984168-A - Charge state control method and device of energy storage power station, electronic equipment and medium

CN121984168ACN 121984168 ACN121984168 ACN 121984168ACN-121984168-A

Abstract

The invention relates to the technical field of energy storage system control, and discloses a charge state control method, a device, electronic equipment and a medium of an energy storage power station, wherein the energy storage power station comprises a plurality of energy storage units; the method comprises the steps of determining whether an initial charge state meets an equalization starting condition or not based on whether the initial charge state reaches a preset equalization threshold value, establishing a convex optimization model for distributing charge and discharge power of each energy storage unit when the initial charge state meets the equalization starting condition, solving the convex optimization model by taking the minimum difference between the maximum charge amount and the minimum charge amount of each energy storage unit in the current period as a target to obtain a charge and discharge power distribution result of each energy storage unit, conducting charge and discharge control on each energy storage unit according to the charge and discharge power distribution result, realizing charge state equalization control among the energy storage units, and improving the overall operation efficiency of an energy storage power station.

Inventors

  • GAO QIANG

Assignees

  • 紫光数能(海南)技术有限公司

Dates

Publication Date
20260505
Application Date
20260108

Claims (10)

  1. 1. A method of state of charge control of an energy storage power station, the energy storage power station comprising a plurality of energy storage units, the method comprising: acquiring initial charge states of all energy storage units in a current period; determining whether the initial state of charge meets an equalization start condition based on whether the initial state of charge reaches a preset equalization threshold; When the initial state of charge is determined to meet the balance starting condition, a convex optimization model for distributing charge and discharge power to the states of charge of all the energy storage units is established; Solving the convex optimization model by taking the difference between the maximum charge quantity and the minimum charge quantity in each energy storage unit in the current period as a target to obtain a charge and discharge power distribution result of each energy storage unit; and controlling the charging and discharging of each energy storage unit according to the charging and discharging power distribution result.
  2. 2. The method of claim 1, wherein the determining whether the initial state of charge satisfies an equalization start condition based on whether the initial state of charge reaches a preset equalization threshold comprises: acquiring an initial maximum charge amount and an initial minimum charge amount in the initial charge state; When the difference between the initial maximum charge amount and the initial minimum charge amount is determined to be larger than the preset equalization threshold, determining that the initial charge state meets an equalization starting condition; and when the difference between the initial maximum charge amount and the initial minimum charge amount is smaller than the preset equalization threshold, determining that the initial charge state does not meet an equalization starting condition.
  3. 3. The method according to claim 1 or 2, characterized in that the method further comprises: updating the initial charge state of each energy storage unit in the current period in the process of controlling the charge and discharge of each energy storage unit to obtain updated charge states; determining that the updated state of charge meets an equilibrium cutoff condition based on whether the updated state of charge reaches an equilibrium cutoff threshold; and when the updated state of charge meets the equilibrium cut-off condition, executing the step of acquiring the initial state of charge of each energy storage unit in the current period after a preset time interval.
  4. 4. The method of claim 1, wherein the state of charge of each energy storage unit in the current period is calculated based on the following formula: Wherein, the Representing the calculated state of charge of the i-th energy storage unit, Representing the state of charge of the ith energy storage cell in the current energy storage power station, Representing the charging power of the ith energy storage unit in the energy storage power station, Representing the discharge power of the ith energy storage cell in the energy storage power station, Representing the battery capacity of the ith energy storage cell in the energy storage power station, Indicating the charging efficiency of the energy storage unit, Indicating the discharge efficiency of the energy storage unit, Representing the current period.
  5. 5. A method according to claim 3, characterized in that the method further comprises: and when the updated state of charge does not meet the equilibrium cut-off condition, executing the step of solving the convex optimization model by taking the minimum difference between the maximum charge quantity and the minimum charge quantity in each energy storage unit in the current period as a target according to the updated state of charge to obtain the charge and discharge power distribution result of each energy storage unit.
  6. 6. The method according to claim 2, wherein the method further comprises: and when the initial charge state is determined to not meet the balance starting condition, the charge and discharge power of each energy storage unit is distributed evenly.
  7. 7. The method according to claim 1, wherein the method further comprises: And determining constraint conditions of the convex optimization model based on the charging power boundary of the energy storage unit, the discharging power boundary of the energy storage unit, the target state of charge boundary of the energy storage unit and the target total power of the energy storage unit.
  8. 8. A state of charge control device of an energy storage power station, the energy storage power station comprising a plurality of energy storage units, the device comprising: The acquisition module is used for acquiring the initial charge states of all the energy storage units in the current period; The determining module is used for determining whether the initial state of charge meets an equalization starting condition or not based on whether the initial state of charge reaches a preset equalization threshold or not; the model building module is used for building a convex optimization model for distributing charge and discharge power to the charge states of all the energy storage units when the initial charge states are determined to meet the balance starting conditions; The model solving module is used for solving the convex optimization model by taking the difference between the maximum charge quantity and the minimum charge quantity in each energy storage unit in the current period as a target to obtain the charge and discharge power distribution result of each energy storage unit; And the control module is used for controlling the charging and discharging of each energy storage unit according to the charging and discharging power distribution result.
  9. 9. An electronic device comprising a controller, the controller comprising: A memory and a processor in communication with each other, the memory having stored therein computer instructions which, upon execution, cause the processor to perform the method of any of claims 1 to 7.
  10. 10. A computer readable storage medium having stored thereon computer instructions for causing a computer to perform the method of any one of claims 1 to 7.

Description

Charge state control method and device of energy storage power station, electronic equipment and medium Technical Field The invention relates to the technical field of energy storage system control, in particular to a charge state control method and device of an energy storage power station, electronic equipment and medium. Background The distributed energy storage power station is generally uniformly scheduled by an electric energy management system (ENERGY MANAGEMENT SYSTEM, abbreviated as EMS), the energy storage power station comprises a plurality of energy storage converters (PowerConversionSystem, abbreviated as PCS), each PCS is bound with a cluster of batteries, the states of Charge (SOC) of power batteries among battery clusters of the energy storage converters are inconsistent due to different battery aging, conversion loss and historical operation modes, power is distributed according to the PCS capacity or the SOC initialization value proportion in the related art, the quick equalization of the SOC cannot be guaranteed, the PCS Charge and discharge are alternately adjusted, the equalization speed is low, and the quick response requirement is difficult to meet. Disclosure of Invention The invention provides a charge state control method, a device, electronic equipment and a medium of an energy storage power station, which are used for solving the problem of low overall operation efficiency of the energy storage power station caused by inconsistent charge states among energy storage units due to different battery aging, conversion loss and historical operation modes. In a first aspect, the present invention provides a method for controlling a state of charge of an energy storage power station, the energy storage power station comprising a plurality of energy storage units, the method comprising: acquiring initial charge states of all energy storage units in a current period; determining whether the initial state of charge meets an equalization start condition based on whether the initial state of charge reaches a preset equalization threshold; When the initial state of charge is determined to meet the balance starting condition, a convex optimization model for distributing charge and discharge power to the states of charge of all the energy storage units is established; solving the convex optimization model by taking the minimum difference between the maximum charge quantity and the minimum charge quantity in each energy storage unit in the current period as a target to obtain a charge and discharge power distribution result of each energy storage unit; And according to the charge and discharge power distribution result, controlling the charge and discharge of each energy storage unit. According to the invention, the optimal power distribution result is calculated when the state of charge of the energy storage unit in the current period meets the equalization starting condition, and the charge and discharge power distribution result of the state of charge of each energy storage unit is solved based on the convex optimization model, so that the state of charge of each energy storage unit is equalized, and the state of charge of each energy storage unit is rapidly equalized in the shortest practical running time on the premise of keeping the normal power output target of the energy storage power station, such as the state of charge of a battery cluster system of each energy storage converter is rapidly equalized in the shortest practical running time, thereby improving the overall running efficiency of the energy storage power station. In an alternative embodiment, determining whether the initial state of charge meets the equalization start condition based on whether the initial state of charge reaches a preset equalization threshold includes: acquiring an initial maximum charge amount and an initial minimum charge amount in an initial charge state; When the difference between the initial maximum charge amount and the initial minimum charge amount is determined to be larger than a preset equalization threshold, determining that the initial charge state meets an equalization starting condition; And when the difference between the initial maximum charge amount and the initial minimum charge amount is smaller than a preset equalization threshold, determining that the initial charge state does not meet the equalization starting condition. According to the invention, the equalization starting condition is judged through the initial maximum charge quantity and the initial minimum charge quantity, when the equalization threshold value is met, the initial charge state is determined to meet the equalization starting condition, when the equalization threshold value is not met, the initial charge state is determined to not meet the equalization starting condition, under the condition that the system is ensured to normally operate, when the equalization starting condition is met, the aim of equalization of the