Research on a PV-energy storage system with integration of grid-connection and disconnection modes based on low-pressure DC distribution network

doi:10.3969/j.issn.1674-1951.2021.04.010

Abstract

Abstract:

In order to keep the stability of the inverters connected to a weak grid,a PV-energy storage system with integration of grid-connection and disconnection modes based on low-voltage DC distribution network is proposed.The system includes PV modules,common DC bus,energy storage system,low-voltage DC distribution network,AC/DC loads and multiple power converters.According to the three-level energy management strategy for PV generation,energy storage and distribution network,different power converter control strategies were taken.The system has four working modes：isolated operation with PV power generation,grid-connected operation with PV power generation,isolated operation with battery power supply,grid-connected operation with grid power supply.Each working condition was simulated in Matlab/Simulink.The results verify the correctness of the proposed system,which provides a theoretical reference for the practical application of the PV-energy storage system with integration of grid-connection and disconnection modes based on low-voltage DC distribution network.

Key words: DC grid-connection, PV-energy storage system, integration of grid-connection and disconnection, energy management, low-voltage DC distribution network, power converters, energy storage system, harmonic oscillation

CLC Number:

TK02

LIU Jindou, CHENG Jie, YU Gaowei. Research on a PV-energy storage system with integration of grid-connection and disconnection modes based on low-pressure DC distribution network[J]. Huadian Technology, 2021, 43(4): 63-70.

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项目	工况1	工况2	工况3	工况4
光伏侧	CV模式	MPPT模式	关闭或MPPT模式	关闭
电池侧	关闭或Buck模式	CV模式	Boost模式	Buck模式
并网侧	关闭	Boost模式	关闭	Buck模式
直流负载侧	Buck模式	Buck模式	Buck模式	Buck模式
全桥逆变器	逆变模式	逆变模式	逆变模式	逆变模式

项目		参数值	项目		参数值	项目		参数值	项目		参数值	项目		参数值
光伏侧	C_PV/μF	4	电池侧	C_bat/μF	60	并网侧	C_grid/μF	100	直流负载侧	C_dcr/μF	50	全桥逆变侧	L_A/mH	5
	L₁/mH	2		L₂/mH	2		L₃/mH	2		L₄/mH	2		L_B/mH	5
	f_s/kHz	20		f_s/kHz	20		R/Ω	1		R_dc/Ω	100		R_ac/Ω	31.1
	V_mp/V	261		V_bat/V	295~332		V_grid/V	600		V_dcr/V	240		V_ac/V	220
	P_n/W	5 000		P_n/W	5 000					P_dcr/W	576		P_dc/W	1 555

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