现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学)，吉林省 吉林市 132012
Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education (Northeast Electric Power University), Jilin 132012, China
The battery energy storage is regarded as a high quality frequency regulation resource because of its fast throughput of power, however, excessive charging and discharging will cause insufficient frequency regulation capability of the energy storage. This paper proposes a control strategy to improve the performance of primary frequency regulation (PFR) with energy storage system. Firstly, the deadband of energy storage is limited within the deadband range of units, and the impact of the deadband variation of energy storage on frequency is analysed with the grid frequency characteristics. On the basis of this, the strategy of PFR with energy storage based on weight factors and state of charge (SOC) recovery is proposed, when the frequency fluctuation exceeds the deadband of frequency regulation for the energy storage, a calculation method of frequency regulation coefficients for energy storage is proposed, which is used to avoid excessive charging and discharging of batteries, at the same time, two weigh factors of the virtual inertia control and the virtual droop control are introduced, whose ratios vary with the frequency, and then, the control method of frequency regulation is designed. When the frequency fluctuation doesn't exceed the deadband of frequency regulation for the energy storage, a method of the SOC recovery is put forward, which takes the need of the energy storage recovery and the grid affordability into account. Simulation results indicate that the proposed strategy can improve the frequency fluctuation of the grid and the SOC of the energy storage.
LI Junhui, HOU Tao, MU Gang, et al. Strategy of Primary Frequency Regulation with Energy Storage System Based on Weight Factors and State of Charge Recovery[J/OL]. Automation of Electric Power Systems, http://doi. org/10.7500/AEPS20200320002.