Authors: R. Geetha; M. Ramaswamy
Addresses: Department of Electrical Engineering, Annamalai University, Annamalai Nagar-608002, Tamilnadu, India ' Department of Electrical Engineering, Annamalai University, Annamalai Nagar-608002, Tamilnadu, India
Abstract: The paper develops a new multilevel inverter (MLI) topology with a view to reduce the number of power switches in the passage of current to reach each level of the output voltage. The philosophy involves the use of bidirectional switches to avert the flow of circulating current between the two sections of the power circuit. The formulation brings in the use of a new pulse width modulation strategy to eliminate the higher frequency components of the output voltage. It incorporates the phase disposition type of modulating scheme to shape both the voltage and current to a nearly sinusoidal waveform. The total harmonic distortion indexed by smaller values for the output voltage over the traditional firing scheme serves to be the highlight for the MLI in acclaiming its place in the inverter world. The experimental results obtained using a prototype validate the simulated performance and establish the viability of the proposed MLI to serve the diverse needs of the utility world.
Keywords: multilevel inverter; MLI; total harmonic distortion; THD; phase disposition; PD; pulse width modulation; PWM.
International Journal of Power Electronics, 2020 Vol.11 No.1, pp.20 - 37
Received: 16 Oct 2016
Accepted: 26 Aug 2017
Published online: 02 Dec 2019 *