Power optimization management method for photovoltaic microgrids based on the state of charge of hybrid energy storage systems

doi:10.19799/j.cnki.2095-4239.2024.1126

Abstract

Abstract:

As power systems are increasingly adopting renewable energy sources, the power quality and stability of microgrids are impacted by the volatility of photovoltaic (PV) power generation. To address this issue, a power optimization management method for PV microgrids based on the state of charge (SOC) of hybrid energy storage systems is proposed herein. It dynamically allocates power between the PV system, energy storage system, and microgrid by monitoring the SOC of the supercapacitor and battery. The supercapacitor handles transient power regulation to respond to sudden load changes, thereby reducing the instantaneous response stress on the battery and extending its lifespan. The battery primarily manages average power regulation and ensures sustained system stability. Simulation results show that when the PV irradiance suddenly decreases from 1000 to 600 W/m², the DC bus voltage is restored to 100 V within 0.15 s and the voltage overshoot is controlled within 1%. The total harmonic distortion (THD) of the grid current is reduced to 1.11%, meeting IEEE 519 standards. The system frequency deviation is controlled within ±0.01 Hz under varying loads, meeting the voltage and frequency stability requirements of IEEE 929. The results demonstrate that the proposed method considerably enhances the power quality and stability of PV microgrids.

Key words: hybrid energy storage state of charge, photovoltaic microgrid power optimization, dynamic power distribution, supercapacitor, renewable energy

CLC Number:

TM 911.4

Zhen YAN, Qiang LIU, Huibin LI, Jun ZHANG, Yahui JIANG. Power optimization management method for photovoltaic microgrids based on the state of charge of hybrid energy storage systems[J]. Energy Storage Science and Technology, 2025, 14(5): 2067-2077.

Figures/Tables 17

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规格	参数	值
光伏阵列	V_pv	40 V
光伏阵列	i_pv	20 A

超级电容器	V_sc	16.4 V
	i_p	200 A
	C_sc	52 F
	i_mc	17 A

电池	c_b	13 Ah
电池	V_b	10 V

电池BDDC	R_b	0.5 Ω
	L_b	5 mH
	C_b	220 μF
	C_db	220 μF

超级电容器BDDC	L_sc	5 mH
超级电容器BDDC	C_dsc	220 μF

VSC	L_f	10 mH
	C_f	1 μF
	C_di	2200 μF

PV变换器	L₁= L₂	5 mH
	C₁	110 F
	C₂	220 μF

负载参数	R_ldc	50 Ω
	R_Lac	10 Ω
	R_nl	30 Ω
	L_nl	1 mH

电网	V_g	240 V
电网	f	50 Hz

直流母线电压	V_dc	100 V
LPF	f_LPF	1 Hz
MAF	f_MAF	100 Hz

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