Fast Frequency Regulation Strategy of PV Power System Assisted by Energy Storage Based on Improved Measurement Method of RoCoF
Jia Jiaoxin1, Yan Xiangwu1, Li Tiecheng2, Wang Yuke1, Ma Hongbin1
1. Key Laboratory of Distributed Energy Storage and Micro-Grid of Hebei Province orth China Electric Power University Baoding 071003 China; 2. State Grid Hebei Electric Power Research Institute Shijiazhuang 050021 China
Abstract Large-scale photovoltaic (PV) grid-connected power generation causes a power system to face the problem of inertia decline and insufficient frequency regulation capability. Although the current scheme of active power reserve (APR) can meet the needs participating in primary frequency regulation, it is difficult to provide inertia support and the operation of abandoned solar energy will affect generation benefits. Accordingly, a coordinated control strategy of virtual inertia and primary frequency regulation for energy-storage assisted PV system is proposed. The proposed strategy reduces energy storage capacity by half without losing power generation benefits. The primary frequency regulation is accomplished by the means that variable power point tracking (VPPT) responses frequency’s up disturbance and energy storage equipment responses frequency’s down disturbance. Moreover, energy storage device is used for inertia support control. The essential reason of inertia-power sag caused by the measurement of rate of change of frequency (RoCoF) is revealed through mathematical modeling, and a method to correct the measurement value of RoCoF by the first-order high-pass link is proposed to improve the inertia control effect. The control effects of the proposed strategy and the APR strategy are compared and analyzed in simulation example of microgrid. The results show that the coordinated strategy has better performance.
Jia Jiaoxin,Yan Xiangwu,Li Tiecheng等. Fast Frequency Regulation Strategy of PV Power System Assisted by Energy Storage Based on Improved Measurement Method of RoCoF[J]. Transactions of China Electrotechnical Society, 2022, 37(zk1): 93-105.
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