Frequency modulation energy storage system based on charging and discharging shunt control

Abstract

The invention belongs to the technical field of electrochemical energy storage application, and particularly relates to a frequency modulation energy storage system based on charging and discharging shunt control. An energy storage management and control system performs real-time monitoring and dynamic configuration adjustment, namely, an energy storage unit composed of three or more storage battery strings and an energy storage converter is divided into two energy storage subsystems, the energy storage management and control system receives a frequency modulation power instruction sent by thepower grid dispatching through an AGC terminal, and when the charged energy storage subsystem is fully charged or the discharging energy storage subsystem completely discharges, the energy storage management and control system is real-timely monitored and determined to carry out the dynamic configuration adjustment again, so that the charging and discharging continue to be carried out effectivelyand safely in a shunt manner. The charged energy storage subsystem is charged in the process from the completion of one dynamic configuration adjustment to the next dynamic configuration adjustment,and the discharging energy storage subsystem only discharges, so that the battery damage caused by the frequent charging and discharging conversion of an energy storage battery is greatly improved, the efficiency of the energy storage system is effectively improved, and the service life of the energy storage system is prolonged.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage applications, and in particular relates to a frequency modulation energy storage system based on charge and discharge shunt control. Background technique [0002] The battery energy storage system has obvious advantages in participating in power grid frequency regulation, and has been sought after by the industry and widely used. The operation characteristics of the battery energy storage system applied to the frequency modulation of the power grid (power plant) is that it needs to be charged and discharged frequently, and the average charge and discharge can reach hundreds of times per day. This is a huge challenge for lithium batteries with limited charge and discharge times. , seriously affecting the efficiency and life of the lithium battery energy storage system. How to reduce the repeated charge and discharge times of lithium batteries is a key issue to improve the ef...

AI Technical Summary

Problems solved by technology

The operation characteristics of the battery energy storage system applied to the frequency modulation of the power grid (power plant) is that it needs to be charged and discharged frequently, and the average charge and discharge can reach hundreds of times per day. This is a huge challenge for lithium batteries with limited charge and discharge times. , which seriously affects the efficiency and life of the lithium battery energy storage system

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