Decoupling Control of Paralleled Single-Phase GTO PWM Converters for Electric Traction Drives

Abstract

For parallel operating system of two single-phase GTO PWM converters, a coupling effect between two secondary sides due to a common primary leakage inductance of the input transformer is analyzed and solved by cross-compensation. With this strategy, the source current becomes more sinusoidal waveform. In addition, an effective power factor control scheme considering the magnetizing current of the transformer is involved. Experimental results for a laboratory system of 20kVA converter confirm the validity of the proposed algorithm.