Speed Control of Induction Machine Based on Matrix Converter with Unbalanced Input Voltage

Matrix Converter (MC) is a direct energy conversion device with high input power factor. As a device without dc link elements، its output characteristic and reliability can be degraded by ac line side disturbances. This has attracted many researchers to make efforts to solve this problem. In this paper، under unbalanced input voltage conditions، behaviors of the MC controlled with Venturini method are analyzed. The output voltage is estimated and a PI controller compensation method to prevent negative effects of the input voltage harmonics is proposed. Using this technique، output harmonic contents are reduced and stable control of the load voltages and currents is ensured. The MC is used for fed induction motor that reference voltage for converter is computed with controller based on input-output feed-back linearization. Simulation results are presented in the paper to verify effectiveness of the approach.