矩阵式变换器在电源异常时的运行性能分析

矩阵式变换器是一种直接型的三相交流-交流电能变换装置.由于不具有直流储能环节,其输入侧电源的异常情况直接影响到输出侧的性能.本文根据矩阵式变换器的工作原理,从理论上分析了变换器在输入侧电源电压幅值不平衡和波形非正弦两种情况下的输出特性,讨论了输入侧电压变化对输出电压和电流中谐波成分的影响.分析了输入侧电源瞬时断电时矩阵式变换器的运行特性.按照上述三种异常情况,在一台2.7kVA的矩阵式变换器样机上进行了实验评估.

Analysis on matrix converter operation in abnormal conditions

Matrix converter is a direct three phase AC to AC power conversion device. Due to the absence of DC link capacitors, the abnormal conditions at input side of matrix converter may influence the output performance directly. In this paper, the output characteristics of matrix converter have been theoretically analyzed in the conditions that the input power supply voltages are unbalanced and non sinusoidal respectively. The unbalanced and non sinusoidal power supply voltages introduce low order harmonic components into the output voltages of matrix converter and result in the distortion of the output current. The behavior of the input power supply short time blackout and the rapid re starting capability of matrix converter have been discussed in this paper. The experimental tests, in terms of unbalanced, non sinusoidal power supply voltages and short time blackout, have been carried out on a 2.7kVA prototype of matrix converter. Experimental results demonstrate the theoretical analysis.