Power Coordination Strategy for Hybrid Energy Storage in AC/DC Microgrids Based on Virtual Impedance-Fuzzy Algorithm

doi:10.16183/j.cnki.jsjtu.2023.308

Abstract

Abstract:

A hybrid energy storage system consisting of batteries and supercapacitors can be integrated into the microgrid, to mitigate the power fluctuations on both sides of the source and load sides, which is a common issue in AC/DC hybrid microgrids. This paper proposes a power coordination strategy for hybrid energy storage in AC/DC microgrids based on virtual impedance and fuzzy algorithm optimization. First, the initial power allocation for hybrid energy storage is autonomously determined using composite virtual impedance. Then, a comprehensive analysis is conducted to assess the influence of composite virtual impedance parameters and filtering time constant on power distribution. Based on this, a power distribution adjustment method is proposed, and fuzzy control rules are derived. The fuzzy algorithm is used to adaptively optimize the output power of hybrid energy storage based on the state of charge and the power demond on the supercapacitor. Finally, the power in the AC/DC interlinking converter is adaptively adjusted to enhance the regulation ability of hybrid energy storage. The simulation results in MATLAB/Simulink experiments demonstrate that the proposed strategy can effectively suppress power fluctuations on both the source and load sides, eliminate DC bus voltage deviation, and prevent the issues such as over-charging and over-discharging of supercapacitors, thereby extending the service life of the equipment.

Key words: AC/DC hybrid microgrid, hybrid energy storage, composite virtual impedance, fuzzy control, power coordination, interlinking converter

CLC Number:

TM743
TM744

ZHAO Yongxi, GAO Pengchao, FAN Hong. Power Coordination Strategy for Hybrid Energy Storage in AC/DC Microgrids Based on Virtual Impedance-Fuzzy Algorithm[J]. Journal of Shanghai Jiao Tong University, 2025, 59(3): 388-399.

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SOC值	充放电状态	超级电容出力目标	T	R_V	C_V
过大	放电	增加	↑	↑	↑
	充电	减少	↓	↓	↓
过小	放电	减少	↓	↓	↓
	充电	增加	↑	↑	↑

R_V/C_V		SOC
R_V/C_V		NB	NS	Z	PS	PB
$P h e s s *$	NB	PB	PM	Z	NM	NB
	NS	PM	PS	Z	NS	NB
	PS	NB	NS	Z	PS	PM
	PB	NB	NM	Z	PM	PB

参数	取值	参数	取值
直流母线电压,U_dc/V	800	并网侧电感,C_g/μF	24.47
电网线电压,U_g/V	380	储能电感,L_B/mH	21
交流频率,f/Hz	50	风力机侧滤波电容,C_W/μF	10
光伏滤波电感,L_pv/mH	2.2	风力机并网侧滤波电感,L_c/mH	2.76
光伏滤波电容,C_dc/μF	0.16	R_V/Ω	0.5
开关频率,f_s/kHz	10	C_V/F	0.06