魏金成,游芳,王嘉磊,李清.光伏发电系统中三相逆变器不平衡控制的分析[J].电测与仪表,2015,52(6):. WEI Jin-cheng,YOU Fang,WANG Jia-lei,LI Qing.Analysis of Three-Phase Inverter for Photovoltaic Power System under Unbalanced Load Condition[J].Electrical Measurement & Instrumentation,2015,52(6):.
光伏发电系统中三相逆变器不平衡控制的分析
Analysis of Three-Phase Inverter for Photovoltaic Power System under Unbalanced Load Condition
For the characteristic of off-grid three-phase inverter with unbalanced load in photovoltaic power system. The paper analyzed the off-grid three-phase inverter circuit topology structure and its corresponding control method in detail. Analyzed three-phase three-leg inverter circuit, introduced instantaneous capacitor-current feedback control, at the same time used split-phase control for three-phase output voltage by LCL-filtered. The output voltage of each phase compared with reference voltage used PI operation, and then compared with capacitor current produced K as SPWM pulse to control switch component, to realize the three-phase inverter output voltage balanced. With Matlab/Simulink simulation model presented. The analysis of simulation displayed that the control method applied in this paper, with serious imbalanced three-phase load, output voltage of three-phase’s imbalance degree was small, also with stronger nonlinear load capacity. Accordingly, the balanced output voltage is guaranteed under any unbalanced loads.
