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Abstract
Selective Harmonic Elimination (SHE) is often utilized in both two-level inverters and multilevel inverters to reduce the switching frequency and the Total Harmonic Distortion. For both two level and multilevel inverters, most SHE studies are based on solving multiple variable high order nonlinear equations. This dissertation addresses the further developed harmonics injection and equal area criteria based four-equation method to realize Selective Harmonic Elimination for two-level inverters and multilevel inverters with unbalanced dc sources. Compared with existing methods, the proposed method does not involve complex equation groups and is much easier to be utilized in the case of large number of switching angles or multiple switching angles per voltage level in multilevel inverters. For harmonics compensation for active power filters, the proposed method is modified for selective harmonics generation based on distributed energy resources. By using advanced instantaneous power theory, the four-equation based method can be used as a comprehensive and universal solution for reliable and efficient power delivery in smart grids. Simulation is carried out in MATLAB/ SIMULINK software and the results of matrix converter based selective harmonic elimination are presented.