三相-单相矩阵变换器输入电流相角补偿控制

摘要

研究减小三相输入单相输出矩阵变换器输入无功功率的控制问题,由于三相-单相矩阵变换器输入滤波器滤波前后电流基频分量的相位差,导致了输入无功功率的增加.为减小输入无功功率,分析研究了网侧输入电流与主电路侧输入电流相位差的解算方法,并推导了与输入电压和电流幅值的表达式,补偿后使输入电压和电流达到同相位的效果.针对提出的控制方法,研究了输入电流相角补偿的三相-单相矩阵变换器的闭环控制方法,推导了最大电压传输比表达式,并分析相角补偿后对最大电压传输比的影响.仿真结果表明,在不同的负载条件下,改进方法都能有效地减小了矩阵变换器的输入无功功率.%A three - phase to single - phase matrix converter input current and input filter introduce a phase difference between the input current before and after the filter, which directly results in more input reactive power. To reduce input reactive power, a phase difference between grid side input current and main circuit side input current algorithm was proposed, amplitudes of input voltage and current can be used to compensate the displacement angle to reach the same phase. MC closed - loop control method based on input current angle compensation was presented, and the expression and detailed analyses for compensating angle were carried out. The validity of proposed method was verified by simulation. It shows that input reactive power can be reduced in any load condition by this control method.