Analysis on harmonic characteristic of the input current in indirect matrix converter

In order to suppress harmonics and optimize power grid quality for the indirect matrix converter (IMC), harmonic characteristics of the input current in IMC are analyzed. The classic dual space vector modulation (SVM) method is adopted for IMC. Generally, only the rough results of harmonic analysis can be achieved by using the conventional mathematical model based on the transfer function. In this paper, the pulse barycentre theory, in which the pulse width, distribution position and amplitude are all considered, is introduced to obtain the accurate harmonic components and their magnitudes. Furthermore, the principle of the zero voltage vector pulse proportional symmetrical distribution has been found to attenuate input current harmonics. Simulation and experimental results show that the input current harmonics coincide with the theoretical results and demonstrate the validity of the theoretical analysis ultimately.