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Cascaded H-Bridge Multilevel Inverter with a New Selective Harmonic Mitigation Technique to Meet Grid Codes Under Non-Equal Dc Link Voltages with Power Quality Enhancement

B.Rajashekar, T.Praveen Kumar, R.Ramesh

This paper presents a new control technique to meet the grid codes in cascaded multilevel inverters. In this paper a new selective harmonic mitigation (SHM-PWM) technique to produce waveforms with low switching frequency without compromising waveform quality, which is capable of meeting grid codes even under non equal dc link voltages. In this paper by maintaining voltage balancing and reducing the total harmonic distortion we can achieve the enhancement of power quality with unequal dc sources. This paper also focuses on the method to enhance the power quality of individual cells which leads to higher power conversion efficiency with equal power distribution. This reduces the initial cost, and complexity hence it is apt for industrial applications. Simulation work is done using the MATLAB software and experimental results have been presented to validate the theory.