Optimal Control Strategy for Energy Storage Power Station in Primary Frequency Regulation of Power Grid

doi:10.11930/j.issn.1004-9649.202102028

Abstract

Abstract: In order to achieve accurate and fast primary frequency regulation of power grid without compromising the safety of the participating energy storage system, this paper proposes an energy storage assisted frequency modulation adaptive optimization control strategy considering both the State of Charge (SOC) and State of Health (SOH) in response to the demand of real power generation due to the system frequency deviation. According to the real-time status of the energy storage unit, the optimal switching plan is determined for multiple groups of energy storage units participating in the primary frequency modulation of the power grid. In the early stage of frequency change, depending on their health status, multiple groups of energy storage units should coordinate their output together to reduce frequency deviation. During the frequency recovery stage, the health status and charging state of each storage unit is taking into account individually so as to ensure the performance of energy storage frequency modulation while keeping each energy storage unit in a healthy operating state. In this way both the safety and economy of the energy storage system are improved. Finally, a primary frequency modulation model of the regional power grid was built, and the effectiveness of the strategy was verified by step and continuous disturbance testing.

Key words: energy storage power station, primary frequency modulation, adaptive optimal control, state of charge, safety of energy storage system

ZHANG Jiacheng, XIA Xiangyang, DENG Zihao, CHEN Guiquan. Optimal Control Strategy for Energy Storage Power Station in Primary Frequency Regulation of Power Grid[J]. Electric Power, 2022, 55(2): 19-27.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202102028

https://www.electricpower.com.cn/EN/Y2022/V55/I2/19

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