Coordinated control method for pumped and flywheel hybrid energy storage system

doi:10.19799/j.cnki.2095-4239.2022.0550

Abstract

Abstract:

First, a pumped storage unit with a capacity of 300 MW and a flywheel storage array with a capacity of 25 MW are modeled and their corresponding charging and discharging characteristics are analyzed. Then, a coordinated control strategy is proposed for the pumped and flywheel hybrid energy storage system, based on the ramp input control strategy for the hydroelectric unit and the state of charge (SOC) segmentation control strategy for the flywheel energy storage array. The proposed method is aimed to improve the integrated frequency regulation index of the pumped storage unit by a factor of 2 and reduce the wear and tear of the unit for reduced loss cost. Finally, the proposed coordinated control strategy for the hybrid energy storage system is verified by numerical experiments using the historical operation data of a pumped storage unit with a rated power of 300 MW. In the process of secondary frequency regulation of the power grid, the results show that the proposed coordinated control strategy of the hybrid storage system can improve the performance index of the integrated frequency regulation by more than 2.29 times for the pumped storage unit. In addition, the frequent output adjustment is significantly reduced during the smooth operation of the pumped storage unit, leading to reduced loss cost and improved steady-state operation characteristics for the pumped storage unit. Moreover, the SOC of the flywheel energy storage array is also maintained at a reasonable level.

Key words: pumped hydro storage, flywheel energy storage, hybrid energy storage system, coordinated control method, secondary frequency regulation

CLC Number:

TM 712

Xin WU, Wenju SHANG, Zhiyong MA, Wei TENG, Shuang ZHANG, Hairong LUO. Coordinated control method for pumped and flywheel hybrid energy storage system[J]. Energy Storage Science and Technology, 2023, 12(2): 468-476.

Figures/Tables 11

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调节形式	调节速度(每分钟额定容量的百分数)	调节精度	响应时间
全厂	>80%Pe/min	<10 MW	<20 s
单机	>80%Pe/min	<5 MW	<20 s

项目		AGC指令变化/MW	综合调频性能指标	调频性能指标平均值	综合调频指标提升倍数
发电工况	单独机组	0→150	2.54	2.11	3.46
	单独机组	150→250	1.67	2.11
	混合储能	0→150	7.33	7.31
	混合储能	150→250	7.29	7.31
抽水工况	单独机组	0→ -260	3.14	3.14	2.29
	混合储能	0→ -260	7.33	7.19
	混合储能	-260→ -265	7.12
	混合储能	-265→ -260	7.12

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