The Control Technology Research of the Z-source Three-phase Four-bridge Arm Inverter

Xiangli Li, Zhaoyang Yan, Keke Pan, Chenghao Ma, Hanhong Qi

Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, Yanshan university, Qinhuangdao, China.

DOI: 10.4236/epe.2013.54B142                

Abstract

Z-source inverter can boost the voltage of the DC-side, allow the two switches of the same bridge arm conducting at the same time and it has some other advantages. The zero-sequence current flows through the fourth leg of the three-phase four-leg inverter so the three-phase four-leg inverter can work with unbalanced load. This paper presents a Z-source three-phase four-leg inverter which combines a Z-source network with three-phase four-leg inverter. The circuit uses simple SPWM modulation technique and the fourth bridge arm uses fully compensated control method. The inverter can maintain a symmetrical output voltage when the proposed scheme under the unbalanced load.

Keywords

Z-source Inverter; Three-phase Four-leg inverter; Unbalanced Load; Imbalanced Voltage

Conflicts of Interest

The authors declare no conflicts of interest.

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