Frequency control method for power restoration in distribution networks considering distributed energy storage power support

doi:10.19799/j.cnki.2095-4239.2025.0011

Abstract

Abstract:

To address the frequency fluctuation problem in isolated network systems during power restoration, a frequency control method was proposed. The proposed method leverages distributed energy storage to provide power support. First, a time-domain model of an isolated grid system during power restoration was established using the frequency response characteristics of distributed photovoltaic and energy storage devices. Second, a frequency control strategy for energy storage support was constructed, and stable margin optimization and transient frequency optimization control modes based on model predictive control were developed. The weight coefficient between the objective functions was obtained using the Harris Hawk optimization algorithm. Finally, the frequency modulation performances under different control strategies were compared through simulation examples to verify the effectiveness of the proposed method. The results demonstrate that the proposed method effectively improves the maximum frequency fluctuation and regulation time of the system, suppresses the frequency fluctuation problem in the power supply recovery process of the distribution network, and enhances the frequency control performance of the system.

Key words: distribution network, distributed energy storage, fault recovery, model predictive control, frequency control

CLC Number:

TM 732

Zitao WANG, Haoran LI. Frequency control method for power restoration in distribution networks considering distributed energy storage power support[J]. Energy Storage Science and Technology, 2025, 14(7): 2738-2751.

Figures/Tables 20

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符号	含义	数值
H_G	同步机时间惯性常数	6
D	阻尼系数	0.01
k_d	分布式光伏的一次调频控制增益	6
T_PV1	指令下发的时间常数	2
T_PV2	逆变器的执行时间常数	0.8
k_E	储能机组的调频增益系数	10
T_E1	储能机组的惯性响应系数	0.1
T_E2	指令下发的时间常数	2
P_L	负荷扰动	0.2

控制方法	最大频率波动/Hz	调节时间/s
本工作控制方法	-0.22	24.57
传统MPC控制	-0.4	35.67
PID控制	-0.52	25.83

控制方法	最大频率波动/Hz	调节时间/s
本工作控制方法	-0.23	25.01
传统MPC控制	-0.44	36.31
PID控制	-0.64	25.92

控制方法	最大频率波动/Hz	调节时间/s
本工作控制方法	-0.27	24.56
传统MPC控制	-0.52	35.38
PID控制	-0.74	36.93

控制方法	最大频率波动/Hz	调节时间/s
本工作控制方法	-0.20	24.63
传统MPC控制	-0.38	34.97
PID控制	-0.48	26.02