Research on Control Strategy of Photovoltaic System for Voltage Ride Through

doi:10.11985/2023.02.024

Abstract

Abstract:

Aiming at the problem that it is hard to fast and rapidly regulate DC system’s voltage during grid voltage ride through in two-stage photovoltaic system, a power-voltage hybrid control strategy is proposed. When grid-connected voltage is relatively stable, inverter participates in DC voltage regulation, and boost converter works in maximum power point tracking(MPPT) mode. When grid voltage ride through happens, inverter maintains ability to control DC voltage, while boost converter switches from MPPT mode to voltage control to realize stable DC voltage regulation rapidly, with reduced fluctuation and improved DC system stability. To verify stable regulation ability of proposed power-voltage hybrid control strategy during grid voltage ride through, a dynamic experiment of grid-connected photovoltaic system under grid voltage ride through is carried out based on RT-LAB hardware-in-the-loop test platform. The results show that compared with traditional control strategy, the improved power-voltage hybrid control strategy can decrease DC voltage fluctuation from 78 V to 7.7 V, and reduce voltage fluctuation rate from 19.5% to 1.9%, which improves voltage stability of DC system.

Key words: Photovoltaic system, maximum power point tracking, hybrid control strategy, voltage fluctuation, DC bus voltage

CLC Number:

TM561

WANG Xiaoli, ZHANG Hanhua, XUE Fei, XU Hengshan. Research on Control Strategy of Photovoltaic System for Voltage Ride Through[J]. Journal of Electrical Engineering, 2023, 18(2): 236-244.

Figures/Tables 21

References 19

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对比项目	传统控制策略	功率-电压切换控制策略
u_b,min/V	354	389
u_b,max/V	445	409
Δu_b/V	91	20
δ(%)	22.8	5

参数	数值与型号
光伏板型号	APM36P40W67x58
光伏板短路电流I_sc/A	2.91
光伏板开路电压U_oc/V	21.5
光伏板峰值电压U_p/V	17.5
光伏板峰值功率P_p/W	40
光伏板峰值电流I_p/A	2.29
光伏板并联数N_para	50
光伏板串联数N_ser	3
系统开关频率f_s/kHz	20
u_b的参考值U_b,ref/V	400
并网电压U_g/V	220
功率-电压切换的动作系数h_Δ,u	1.5

对比项目	传统控制策略	功率-电压切换控制策略
u_b,ac,min/V	-46	-3.7
u_b,ac,max/V	32	4
Δu_b/V	78	7.7
δ(%)	19.5	1.9