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CN-121984156-A - Automatic voltage calibration method and energy storage system

CN121984156ACN 121984156 ACN121984156 ACN 121984156ACN-121984156-A

Abstract

The application discloses a voltage automatic calibration method and an energy storage system, wherein the energy storage system comprises an energy storage converter and a plurality of battery packs which are connected in a communication way; and responding to the fault communication zone bit as a fault state, acquiring a first voltage value of other battery packs with the fault communication zone bit as a normal state, wherein the first voltage value is a voltage value which is synchronously transmitted to a plurality of battery packs in advance by the energy storage converter, and adjusting the bus voltage value of the current battery pack based on the acquired first voltage value. According to the application, the fault communication zone bit of the battery pack is monitored, when the fault communication zone bit is monitored to be in a fault state, namely, when the communication between the battery pack and the energy storage converter is abnormal, the battery packs with normal communication in the energy storage system are utilized to acquire the corresponding voltage values, so that the self calibration of the bus voltage values of the battery pack with communication faults is realized.

Inventors

  • XU SONG

Assignees

  • 安克创新科技股份有限公司

Dates

Publication Date
20260505
Application Date
20241029

Claims (10)

  1. 1. The automatic voltage calibration method is applied to an energy storage system and is characterized by comprising an energy storage converter and a plurality of battery packs, wherein the energy storage converter is respectively in communication connection with the plurality of battery packs, and the plurality of battery packs are in communication connection with each other, and the method comprises the following steps: acquiring a fault communication zone bit of a current battery pack, wherein the fault communication zone bit represents the communication state of the current battery pack and the energy storage converter; responding to the fault communication zone bit as a fault state, and acquiring first voltage values of other battery packs in which the fault communication zone bit is in a normal state, wherein the first voltage values are voltage values which are synchronously sent to the plurality of battery packs by the energy storage converter in advance; And adjusting the bus voltage value of the current battery pack based on the acquired first voltage value.
  2. 2. The method of automatic voltage calibration according to claim 1, wherein prior to the step of obtaining a fault communication flag of the current battery pack, the method further comprises: In response to the energy storage converter pre-synchronously transmitting the first voltage value to the plurality of battery packs, for any one of the battery packs, Setting the fault communication zone bit corresponding to the current battery pack to be in a normal state when the current battery pack acquires the first voltage value, or setting the fault communication zone bit corresponding to the current battery pack to be in a fault state when the current battery pack does not acquire the first voltage value; And sending the state data which corresponds to the current battery pack and contains the first voltage value and the fault communication zone bit to other battery packs in communication connection with the battery pack.
  3. 3. The method according to claim 2, wherein the step of acquiring the first voltage value of the other battery packs in response to the failure communication flag being in a failure state, the other battery packs being in a normal state, comprises: acquiring time stamps of the state data corresponding to the fault communication flag bits received by the current battery pack, wherein the time stamps are respectively sent by other battery packs in a normal state; determining a reference battery pack based on all the obtained time stamps; and acquiring the first voltage value in the state data corresponding to the reference battery pack.
  4. 4. The method of automatic voltage calibration according to claim 1, wherein the step of obtaining a fault communication flag bit of the current battery pack includes: Acquiring the current fault count of the battery pack in a preset fault count period; And acquiring the fault communication zone bit of the current battery pack based on the fault count.
  5. 5. The method according to claim 4, wherein the step of obtaining the current failure count of the battery pack in a preset failure count period comprises: acquiring a charging signal at intervals of preset time in the preset fault counting period, wherein the charging signal comprises a second voltage value which is required to be acquired from the energy storage converter by the current battery pack; In response to failing to acquire the charge signal, the failure count is correspondingly incremented once, or, And initializing the fault counting period and resetting the fault counting in response to receiving the charging signal.
  6. 6. The method according to claim 5, wherein the step of acquiring the fault communication flag bit of the current battery pack based on the fault count includes: and determining that the current battery pack and the energy storage converter are abnormal in communication and the fault communication zone bit is in a fault state in response to the fault count being greater than or equal to a first preset value, or, Responding to the fault count being greater than or equal to a second preset value and smaller than the first preset value, obtaining a current bus voltage value of the current battery pack, and calculating a difference value between the current bus voltage value and the second voltage value; and determining that the fault communication zone bit is in a fault state in response to the absolute value of the difference value being greater than or equal to a preset voltage value.
  7. 7. A method of automatic voltage calibration according to claim 3, wherein the step of determining a reference battery based on all of the obtained time stamps comprises: And determining the battery pack corresponding to the timestamp with the earliest time in all the timestamps as the reference battery pack.
  8. 8. The method according to claim 5, wherein the step of adjusting the bus voltage value of the current battery pack based on the acquired first voltage value includes: Comparing whether the first voltage value and the second voltage value are equal; And adjusting the bus voltage value of the current battery pack to the first voltage value in response to the first voltage value and the second voltage value being unequal.
  9. 9. The method of automatic voltage calibration according to claim 1, further comprising: when the fault communication flag bit of each battery pack in the plurality of battery packs is in a fault state, the preset fault battery pack count is increased once; and responsive to the number of failed battery packs counting being equal to the number of the plurality of battery packs in the energy storage system, shutting down the energy storage system.
  10. 10. An energy storage system, characterized in that the energy storage system comprises an energy storage converter and a plurality of battery packs, wherein the energy storage converter is respectively in communication connection with the plurality of battery packs, and the plurality of battery packs are in communication connection with each other; The method comprises the steps of obtaining a fault communication zone bit of a current battery pack of a plurality of battery packs, responding to the fault communication zone bit to be in a fault state, obtaining a first voltage value of other battery packs in a normal state by the current battery pack, wherein the first voltage value is a voltage value which is synchronously sent to the plurality of battery packs by the energy storage converter in advance, and adjusting a bus voltage value by the current battery pack based on the obtained first voltage value.

Description

Automatic voltage calibration method and energy storage system Technical Field The application relates to the technical field of battery pack charging, in particular to a voltage automatic calibration method and an energy storage system. Background With the continuous development of technology, various power electronic products play an indispensable role in life, entertainment and work of people, wherein the cruising ability of the power electronic products is an important standard for performance evaluation, and longer cruising ability represents longer usable time of the power electronic products. In particular, most power electronics generally use a battery as a power source, and the battery may be connected to an energy storage converter, which controls switching of charging or discharging of the battery. In order to improve charge and discharge efficiency and duration, a power supply of the power electronic product can be composed of a plurality of storage batteries, and different storage batteries are respectively in communication connection with the energy storage converter. Therefore, in order to ensure proper operation of the battery pack, it is necessary to ensure proper communication between all the batteries and the energy storage converter. Disclosure of Invention The application provides a voltage automatic calibration method and an energy storage system, which can monitor the communication state between a storage battery and an energy storage converter and automatically calibrate control information when communication abnormality is judged. The first aspect of the present application provides a voltage automatic calibration method applied to an energy storage system, the energy storage system including an energy storage converter and a plurality of battery packs, the energy storage converter being in communication connection with the plurality of battery packs, the plurality of battery packs being in communication connection with each other, the voltage automatic calibration method comprising: acquiring a fault communication zone bit of the current battery pack, wherein the fault communication zone bit represents the communication state of the current battery pack and the energy storage converter; Responding to the fault communication zone bit as a fault state, and acquiring a first voltage value of other battery packs with the fault communication zone bit as a normal state, wherein the first voltage value is a voltage value which is synchronously transmitted to a plurality of battery packs in advance by an energy storage converter; And adjusting the bus voltage value of the current battery pack based on the acquired first voltage value. Further, before the step of obtaining the fault communication flag bit of the current battery pack, the method further includes: In response to a first voltage value that the energy storage converter sends to the plurality of battery packs in advance, for any one battery pack, Setting the fault communication zone bit corresponding to the current battery pack to be in a normal state when the current battery pack acquires the first voltage value, or setting the fault communication zone bit corresponding to the current battery pack to be in a fault state when the current battery pack does not acquire the first voltage value; And sending the corresponding state data containing the first voltage value and the fault communication zone bit to other battery packs in communication connection with the current battery pack. Further, the step of obtaining the first voltage value of the other battery group received in the normal state of the fault communication flag bit in response to the fault communication flag bit being in the fault state includes: Acquiring time stamps of corresponding state data sent by other battery packs with the normal state of the fault communication zone bit received by the current battery pack; determining a reference battery pack based on all the obtained time stamps; And acquiring a first voltage value in the state data corresponding to the reference battery pack. Further, the step of obtaining the fault communication flag bit of the current battery pack includes: Acquiring fault counts of the current battery pack in a preset fault count period; and acquiring a fault communication zone bit of the current battery pack based on the fault count. Further, the step of obtaining the failure count of the current battery pack in the preset failure count period includes: acquiring a charging signal at intervals of preset time in a preset fault counting period, wherein the charging signal comprises a second voltage value which is required to be acquired from an energy storage converter by the current battery pack; In response to failing to acquire the charge signal, the failure count is correspondingly incremented once, or, In response to receiving the charge signal, a failure count period is initialized and a failure count zero setting is cleared. Fur