矩阵式变换器的输入功率因数控制

Input power factor control for matrix converters

矩阵式变换器输入滤波器会引起滤波前后电流基频分量的相位差,降低矩阵式变换器的输入功率因数。为了保证其输入功率因数始终接近1,以减小对电网的不利影响,提出了一种自适应控制方法。根据输入电压和电流值计算输入滤波器前后的电流相位差,并据此实时调节输入相移角的设定值,实现在任意工况下对输入功率因数的有效控制。在一台基于逆阻式IGBT(RB-IGBT)的矩阵式变换器驱动异步电机调速系统样机上进行了实验测试。在不同负载情况下,采用该方法均有效减小了输入功率因数角,使输入功率因数始终接近于1,从而改善了矩阵式变换器的输入性能。

A matrix converter （MC） input filter introduces a phase difference between the input current before and after the filter, which directly influences the MC input power factor. An adaptive input power factor control method was developed to maintain a unity input power factor and reduce the negative influences on the power grid. Measurements of the input voltage and current can be used to adjust the displacement angle in real time to modify the input power factor at the grid side for any load condition. Tests on a RB-IGBT based MC fed induction motor drive prototype demonstrate that the input power factor angle is reduced and matrix converter input power factor is maintained at unity by this control method.