Research on Stable Enhancement of Black Start Frequency for Grid Forming Energy Storage System Based on Unbiased Integral Feedback Frequency Control

doi:10.16628/j.cnki.2095-8188.2024.11.003

Abstract

Abstract:

Grid forming (GFM) control can effectively improve the active support ability of energy storage system to the power grid.However,the frequency deviation introduced by frequency modulation characteristic of GFM energy storage system (ESS) will affect the frequency stability during black start process.In some extreme cases,it will lead to frequency instability and black start failure.To improve the frequency stability of GFM-ESS during black start process, an unbiased integral feedback frequency control is proposed.By adding an integral feedback loop to the virtual synchronous generator control loop and changing the system order,the frequency regulation is unbiased and then the control complexity is effectively reduced during the process of black start.Meanwhile,PLL and underlying control strategy switchover are not required.Finally,the control effect and the influence of the change of crucial parameters on the control performance are verified by the simulation,and the correctness and effectiveness of the control strategy are proved.

Key words: energy storage, black start, integral feedback frequency, virtual synchronous generator (VSG) control

CLC Number:

TM73

QU Zhanzhan, YANG Ruohuan, NIU Meng, DU Gaoxian, WANG Huanling, LIU Yating. Research on Stable Enhancement of Black Start Frequency for Grid Forming Energy Storage System Based on Unbiased Integral Feedback Frequency Control[J]. LOW VOLTAGE APPARATUS, 2024, 0(11): 20-28.

Figures/Tables 17

References 22

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仿真参数	数值
额定有功功率P_ref/MW	1
无功指令值Q_ref/kvar	0
直流母线电压U_dc/V	1 000
电网相电压有效值U_g/V	220
额定角频率ω₀/(rad·s^-1)	100π
电压环比例系数K_pu	0.5
电流环比例系数K_pi	0.75
滤波电感L_f/mH	3
滤波电感寄生内阻R_f/Ω	0.01
滤波电容C_f/μF	20
阻尼系数D/(W·s·rad^-1)	100
虚拟惯量J/(kg·m²)	1
电压环积分系数K_iu	10
电流环积分系数K_ii	50