Minimum error switching strategy for matrix converter with input current control

This paper introduces a new switching strategy for Matrix Converter (MC), the Minimum Error Switching Strategy (MESS) that implements a modified hysteresis based control technique. The technique limits the switching time to produce switching pulses of constant width. The decoupled indirect-space vectors of the MC are used for input current control and output voltage control. Switching vectors are selected based on the minimum computed voltage error and minimum computed current error over every sampling period. Important features of the technique are the constant pulse width switching leading to simplified modulation, uniformly distributed switching stresses over an output cycle and inherent mitigating effects of unbalance at the input. The technique proves to be more efficient in offering superior input and output current spectrums for higher switching frequency. In this paper, under distorted input voltage conditions, behavior of the MC controlled by MESS is analyzed. The proposed PWM algorithm is verified by MATLAB simulation and hardware experimentation on a laboratory prototype and results obtained are satisfactory.