Lithium battery energy storage power station primary frequency modulation design optimization and verification

doi:10.19799/j.cnki.2095-4239.2022.0410

Abstract

Abstract:

Primary frequency regulation is a key technology for energy storage power stations to support the stable operation of new power systems. In this paper, the integrated design of primary frequency modulation of lithium-ion energy storage power station is studied, including the analysis and optimization of response time and overload capacity. The response time is shortened mainly through information collection and transmission, and the operation cycle of strategy algorithm. The switching frequency control scheme of the power device inside the energy storage converter is proposed to improve its overload capacity, the optimization of the above indicators is verified by the 20 MW/10 MWh lithium battery energy storage power station. The results show that when the lithium-ion energy storage power station is applied to the primary frequency regulation condition, the response time of the converter is 60—80 milliseconds, and the overload capacity of the converter can reach 150% within 30 seconds, which improves the power cost performance of the energy storage power station. The energy storage power station can effectively smooth the frequency fluctuation in a frequency regulation test in the isolated network, reduce the operating frequency of the generator set, and provide ideas for the design of the subsequent power energy storage power station.

Key words: lithium-ion battery, energy storage power station, primary frequency modulation, integrated design, overload

CLC Number:

TM 73

Lina WANG, Liping TAN, Zhiqiang XU, Xin TAN, Changlong WU, Hui YE, Aikui LI. Lithium battery energy storage power station primary frequency modulation design optimization and verification[J]. Energy Storage Science and Technology, 2022, 11(12): 3862-3871.

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名称	规格/设计参数
储能电站容量	20 MW/10 MWh
升压变压器容量	2500 kVA
升压变压器额定电压	37±2×2.5%/0.4/0.4 kV
储能变流器(PCS)额定功率	500 kW
储能变流器(PCS)直流工作电压	500～850 V
储能变流器(PCS)交流最大电流	1008 A
单体电池容量	92 Ah，LFP
通信协议	IEC104、CAN

参数名称	赋值	单位	范围	备注
基准频率	50	Hz	50～60	—
高频保护值(异常值)	51	Hz	50～51(电网装机容量在300万千瓦及以上的，为±0.2；300万千瓦及以下的，为±0.5)	《供电营业规则》第五十三条(3)：在电力系统非正常状况下，供电频率允许偏差不应超过±1.0赫兹，采样频率偏离±1.0赫兹认为异常，闭锁调频功能
低频保护值(异常值)	49	Hz	49～50
频率死区上限(退出值)	50.05	Hz	50.05～50.2	基于储能电站装机容量、电网容量、储能寿命确定频率调节死区，避免频率调节反复动作
频率死区下限(退出值)	49.95	Hz	49.95～49.8	基于储能电站装机容量、电网容量、储能寿命确定频率调节死区，避免频率调节反复动作
上调触发频率	50.1	Hz	50.1～50.2	把触发频率偏离值大于死区频率值，降低储能电站的频繁出力，建设储能退出时的冲击
下调触发频率	49.9	Hz	49.9～49.8	把触发频率偏离值大于死区频率值，降低储能电站的频繁出力，建设储能退出时的冲击
调差率	0.025%	—	0.5%～3%	—

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