State of charge (SOC) correction method based on automatic generation control (AGC) frequency modulation energy storage system
An energy storage system and energy storage converter technology, which is applied to measurement devices, instruments, measurement electricity and other directions, can solve the problems of reducing the revenue value of the energy storage system, long maintenance time, and high maintenance costs, so as to save maintenance costs and improve speed and the effect of ensuring operational stability
Pending Publication Date: 2019-01-15
SHENZHEN CLOU ELECTRONICS
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[0005] The purpose of the present invention is to provide an SOC correction method based on AGC frequency modulation energy storage system to solve the problems of the existing SOC correction method of energy storage system, such as long maintenance time, high maintenance cost, and reduced revenue value of energy storage system
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[0054] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention, and similar component numbers in the drawings represent similar components. Apparently, the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0055] figure 1 An embodiment of the AGC frequency modulation energy storage system of the present invention is shown. In this embodiment, the AGC frequency modulation energy storage system includes an AGC control layer, an execution layer and a battery stack management layer.
[0056] Wherein, the AGC control layer is provided with an AGC (Automatic Generation Con...
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The invention discloses a state of charge (SOC) correction method based on an automatic generation control (AGC) frequency modulation energy storage system. The method comprises the steps that each battery management system acquires SOC offset of the battery management system; each battery management system sends the SOC offset to centralized control equipment through an energy storage converter corresponding to the battery management system; the centralized control equipment determines whether at least one SOC offset exceeding a preset SOC threshold exists; if yes, the centralized control equipment ranks SOC offsets, so as to obtain maximum SOC offset; the centralized control equipment sends a correction control instruction to a target battery management system corresponding to the maximum SOC offset through the energy storage converter; the target battery management system executes the correction control instruction so as to enter a correction mode; the target battery management system executes a preset automatic correction policy in the correction mode, so as to perform full charge or full discharge calibration; and after calibration, the target battery management system exits the correction mode. The method improves correction rate and running stability, and saves maintenance cost.
Description
technical field [0001] The invention relates to the technical field of power batteries, in particular to an SOC correction method based on an AGC frequency modulation energy storage system. Background technique [0002] At present, there are many methods for calculating SOC (State of Charge) in energy storage systems, such as: ampere-hour method, voltage method, internal resistance method, neural network method and Kalman filter method, etc. No matter what method is used for calculation, measurement errors cannot be avoided. As time goes by, the measurement error will be accumulated and magnified, so that the deviation of the SOC will become larger and larger, and then regular SOC corrections will be required. [0003] At present, in order to ensure the continuous accuracy of the SOC of the energy storage system, manufacturers generally withdraw the battery stack from the energy storage system when the SOC of the battery stack deviates, and perform full calibration or empty...
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IPC IPC(8): G01R31/3835
Inventor 但助兵邓荣钦袁虎叶天意
Owner SHENZHEN CLOU ELECTRONICS