GRID-FORMING ENERGY STORAGE SYSTEM AND CONTROL METHOD THEREFOR

Abstract

The present application provides a grid-forming energy storage system and a control method therefor. The control method comprises: monitoring the frequency and voltage at a point of common coupling (PCC), and when the frequency and/or the voltage at the PCC exceeds a limit, determining, according to changes in active and reactive power of a system, additional values of active and reactive power of each grid-forming energy storage device connected to a grid by means of the PCC; then, correspondingly layering the additional values of the active and reactive power of each grid-forming energy storage device and response values of the active and reactive power thereof, respectively, to serve as power instruction values for active and reactive power control of each grid-forming energy storage device; further, on the basis that each grid-forming energy storage device is capable of responding to a frequency and voltage disturbance in a local range of the grid-forming energy storage device, from the perspective of the system, by sending the additional values of the active and reactive power, layering a response required for the frequency and/or voltage disturbance at the PCC onto each grid-forming energy storage device, thus further ensuring the stability of the frequency and the voltage at the PCC.

IPC Classifications