Output Voltage Distortion Compensation for Matrix Converter Fed Induction Motor Driven System

Output voltage distortion of matrix converter is caused by non-ideal characteristics of power electronics, such as multi-step commutation delay, turn-on/off delay time, power device on-state voltage drop and minimum pulse width limitation, which straight deteriorates the performance of matrix converter fed induction motor drive system, especially during low-speed operation. In this paper, output voltage distortion of matrix converter under different conditions is analyzed. Based on the investigation, it is detected that, the output voltage error caused by multi-step commutation delay can be cancelled inherently by using three-step commutation. And two compensation methods are proposed to improve the output waveform quality for different causes. In both methods, only output current direction and very simple calculation are needed. Based on a 2.7 kVA matrix converter fed induction motor vector controlled drive prototype, the feasibility and validity of the proposed methods are verified by experimental results