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Optimal Pulse Width Modulation(OPWM) for Elimination of Harmonics in Parallel Converter

Parallel inverters are used for efficiency, reliability, size and economy improvements of grid-connected three-phase inverters. Reduction or elimination of harmonics in parallel inverter is important to reduce the size and cost of the passive filters. In this paper Optimal Pulse Width Modulation (OPWM) technique is used to eliminate specific harmonics and distortion in the parallel connected inverters. This method uses two different set of switching angles for two parallely connected module voltage source inverters. It is shown that two set of three switching angles will eliminate three harmonics in each sub module and six harmonics in two parallel inverters. Simulation of the application of OPWM to the parallel inverters has been comprehensively carried out in MATLAB/SIMULINK software.