Energy storage power station energy management method and device based on SOC real-time estimation

Abstract

The invention discloses an energy storage power station energy management method and device based on SOC real-time estimation, and the method comprises the steps: taking the SOC of a battery pack and the voltage of a third-order RC battery equivalent circuit as state variables, carrying out the iterative optimization calculation of the system state and internal resistance of an energy storage power station through employing a dual-Kalman filtering algorithm, and finally obtaining the SOC of a battery cluster, the power among the battery clusters of different SOCs is reasonably distributed, energy storage power station energy management based on battery SOC real-time estimation is achieved, meanwhile, the operation efficiency of the whole battery energy storage power station is improved, and the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of energy storage battery management, in particular to a method and device for energy management of an energy storage power station based on real-time SOC estimation. Background technique [0002] In recent years, electrochemical energy storage technology has been widely used in power generation, auxiliary services, transmission and distribution, renewable energy access, distributed energy storage and end users in power systems. In September 2017, five ministries and commissions jointly issued the "Guiding Opinions on Promoting Energy Storage Technology and Industrial Development", which pointed out that renewable energy stations are encouraged to reasonably configure energy storage systems, and enterprises such as power grids are encouraged to focus on demand in accordance with relevant national or industry standards. Or distributed access to energy storage systems, and encourage the construction of distrib...

AI Technical Summary

Problems solved by technology

[0004] (1) The accuracy of the battery SOC state value is not high: since most energy storage power stations use direct estimation methods such as discharge experiments or open circuit voltage methods, this method is easy to operate, but this method cannot meet the real-time performance of SOC estimation. Low estimation accuracy in practical engineering applications

[0005] (2) Unreasonable use of battery performance: Most energy storage power stations distribute the required output equally to each battery cluster, but as the capacity of the energy storage power station increases, the number of battery packs in the energy storage power station increases, resulting The difference between them will also become larger. If the energy is used on average, it will cause a certain degree of "short board effect", and it will shorten the service life of the battery and reduce its working performance.

Images