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Harmonic Elimination of SVPWM for Three Phase Inverter and a Systematic Method for Practical Implementation

-Pulse Width Modulation (PWM) inverters play a major role in the field of power electronics. Space Vector Modulated PWM (SVPWM) is the popular PWM method and possibly the best among all the PWM techniques as it generates higher voltages with low total harmonic distortion and works very well with field oriented (vector control) schemes for motor control. High quality output spectra can be obtained by eliminating several low order harmonics by adopting a suitable harmonic elimination technique. In this paper, a mathematical model of space vector modulated three phase inverter is formulated and an offline method for generation of Harmonic Eliminated PWM (HEPWM) by eliminating the low order harmonics of the output waveform is prepared. A systematic online method based on Curve Fitting Technique (CFT) and modification of SVPWM output waveform to a harmonic eliminated waveform is developed for practical implementation. The harmonic spectrum analysis of the proposed model is carried out to ensure the effectiveness. The correctness of the proposed online method is verified by comparing the simulation results with the offline method.