Research on Improved SOGI-PLL Control Method for Single-Phase Grid-Connected Inverters

doi:10.16628/j.cnki.2095-8188.2026.05.002

Abstract

Abstract:

With the increasing demand for renewable energy integration,the synchronization accuracy and power quality of grid-connected inverters have a significant impact on grid stability.To improve the comprehensive performance of single-phase grid-connected inverters,the control scheme of the second-order generalized integrator phase-locked loop (SOGI-PLL) is studied.An APF-SOGI-PLL structure combined with an all-pass filter (APF) and a frequency-locked loop (FLL) is proposed to improve anti-interference ability and frequency tracking performance.Proportional odd-harmonic repetitive control is adopted to enhance harmonic suppression capability.A passive damping method is used to suppress resonant peaks and improve system stability.A simulation model of a 1 kW grid-connected inverter is built in Simulink.Simulation results show that the proposed APF-SOGI-PLL can effectively suppress DC offset and achieve fast frequency synchronization under grid frequency fluctuations.The total harmonic distortion (THD) of the grid-connected current is lower than 0.70%,and the comprehensive performance is superior to that of the comparison methods.

Key words: grid-connected inverter, DC component suppression, frequency adaptation, harmonic suppression

CLC Number:

TM561

YE Ling, CHEN Shirong, YE Peng, WU Ziran, LIANG Bumeng, CHEN Chong. Research on Improved SOGI-PLL Control Method for Single-Phase Grid-Connected Inverters[J]. LOW VOLTAGE APPARATUS, 2026, 0(5): 8-16.

Figures/Tables 12

References 25

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参数	数值
输入直流电压/V	400
额定功率/W	1 000
开关频率/kHz	50
载波频率/kHz	25
并网侧电网参数U_g/f₀	220 V/50 Hz

组别	电网电压 THD/%	SOGI-PLL 结构	并网电流 THD/%
A	3.55	传统SOGI-PLL	1.33
		APF-SOGI-PLL	0.53
		FLL-SOGI-PLL	0.50
B	4.32	传统SOGI-PLL	1.34
		APF-SOGI-PLL	0.70
		FLL-SOGI-PLL	0.69
C	3.13	传统SOGI-PLL	1.26
		APF-SOGI-PLL	0.51
		FLL-SOGI-PLL	0.50