基于改进RoCoF测量方法的储能辅助光伏机组快速调频策略

doi:10.19595/j.cnki.1000-6753.tces.210610

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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.

Key words： Variable power point tracking energy storage device coordinated control frequency regulation photovoltaic power generation phaselocked loop(PLL)

Received: 29 April 2021

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TM732

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	Jia Jiaoxin
	Yan Xiangwu
	Li Tiecheng
	Wang Yuke
	Ma Hongbin

Cite this article:

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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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.210610 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/Izk1/93

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