Using Energy Storage Systems in Fast Frequency Regulation: Case Study of Xinjiang Power Grid

Abstract

The increase of renewable penetration and load fluctuation level has brought new challenges to power system frequency regulation. With the advantage of fast response, energy storage system (ESS) can be used to improve dynamic frequency response of power system. When large frequency disturbance occurs in the power grid, ESS can participate in the fast frequency regulation of the power grid and provide support for the system frequency. For the sending-end power grid where renewable energy accounts for a relatively high proportion and a large amount of power is sent out through multiple high-voltage direct current (HVDC) lines, it puts forward higher requirement on frequency performance. In this paper, a comprehensive case study is performed to benchmark a number of fast frequency support control methods based on a practical test case from Xinjiang power grid under two typical disturbances. The results of the case study indicate model-free control need less capacity usage of ESS and has better adaptability to different operating scenarios.