Capacity configuration method of flywheel storage system for suppressing power fluctuation of wind farms

doi:10.19799/j.cnki.2095-4239.2022.0408

Abstract

Abstract:

Here, the flywheel energy storage system is used to stabilize the active power output of wind farms to make the change in active power in the wind farm meet the recommended value range of the active power change limit in the national standard. Based on the low-pass filtering method, the flywheel energy storage system responds to the high-frequency component of the active power output of the wind farm to reduce the impact of grid-connected power fluctuations on the primary frequency modulation of the power grid. A two-level optimization model with different cut-off frequencies and flywheel energy storage system power and capacity is established to obtain the optimal flywheel energy storage system capacity that meets the flywheel energy storage system's constraints and the requirements of wind power grid-connected active power changes and economic indicators. The outer model initializes the cut-off frequency of the frequency divider, obtains the high-frequency power command, and inputs it to the flywheel energy storage system. Conversely, the flywheel responds according to the reference power in the inner model. After connecting with the wind farm's power, the fluctuation degree of the active power of the grid point is verified. Furthermore, the flywheel energy storage system model is established; the simulation results show that the flywheel energy storage system can better respond to the power command and effectively suppress wind power fluctuation.

Key words: flywheel energy storage, active power output, low pass filtering, capacity of energy storage system

CLC Number:

TM 921

Qingxiang XU, Wei TENG, Xin WU, Yibing LIU, Shuangyin LIANG. Capacity configuration method of flywheel storage system for suppressing power fluctuation of wind farms[J]. Energy Storage Science and Technology, 2022, 11(12): 3906-3914.

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参数	取值
储能本体单位容量费用C_e/(万元/MWh)	3000
储能辅助设施单位容量费用C_a/(万元/MWh)	500
能量转换装置单位功率费用C_p/(万元/MWh)	125
单位功率的固定运行成本C_ope/(万元/MWh)	20
储能充放电效率η	0.9
当前放电量补贴C_c/(元/kWh)	0.3598

参数	取值
额定功率P/kW	250
转动惯量J/(kg·m²)	244
极对数n_p	2
转子电阻R_r/Ω	0.0028
定子电阻R_s/Ω	0.0034
转子电感L_r/H	0.00125
定子电感L_s/H	0.00124
定转子等效互感L_m/H	0.0012

模型变量	输出结果
最优分频频率f/Hz	0.0007
最优储能功率P/W	1.5113×10⁶
最优储能容量E/Wh	6.0883×10⁵

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