Space-vector modulated indirect matrix converter under distorted supply voltage - Effect on load current

This paper concerns the effect of symmetric supply voltage harmonics in a space-vector modulated three-phase indirect matrix converter (IMC). The IMC is controlled using indirect space-vector modulation. The effect of symmetric supply harmonics on load voltages and currents is analysed using space-vector presentation. The measurement and simulation results with distorted supply voltages are compared to the results with pure sinusoidal supply voltage. Three compensation methods are tested in simulations and measurements: 1) calculation of modulation index using measured supply voltages (Method I), 2) feedback control of output currents (Method II), and 3) combination of Methods I and II, i.e. output current control with supply voltage measurement (Method III). All methods are easy to implement and do not require complicated computing. It is noted that the Methods I and III, where modulation index is calculated using measured supply voltages, compensate the effects of harmonics most effectively.