Evaluation and minimisation of total harmonic distortion in three-phase two-level voltage source inverter with low switching frequency Online publication date: Thu, 21-Jul-2022
by Neerparaj Rai; Sandeep Chakravorty
International Journal of Power Electronics (IJPELEC), Vol. 16, No. 1, 2022
Abstract: In this paper, an optimal PWM waveform over complete modulation index-range in terms of least total harmonic distortion (THD%) is determined for two-level three-phase inverter. Two types of pole-voltage PWM waveforms specifically typeA and typeB have been considered at low pulse number (P = 5). The cost function is formulated for each PWM waveform and a combination of genetic algorithm and Newton-Raphson method is used to obtain two solution sets corresponding to typeA and typeB namely solution set-A and solution set-B. Based on the four solution sets, an optimal PWM waveform is proposed to minimise the low order harmonics for the inverter output. The optimal PWM waveform is evaluated and compared with conventional selective harmonic elimination (SHE-PWM) and sine-triangle (ST-PWM) methods. The optimal PWM results in notably improved performance over ST-PWM and SHE-PWM and the results are validated by MATLAB simulation and experimental studies for a two-level inverter.
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