Robust method for optimal PWM harmonic elimination based on the Chebyshev functions

A new procedure is presented, applied to single-phase DC-AC power converters with bipolar output, in order to perform a programmed harmonic elimination using a previous calculation of notch angles. The method is based on the transformation of the trigonometric equations system into its equivalent in algebraic form by means of Chebyshev functions. This gives notable advantages in terms of convergence and processing time. Later, a modulation technique is described for single-phase unipolar output power converters, that obtains an additional elimination on the three multiples order harmonic range. Finally, comparative results to the conventional SPWM (sinusoidal pulse width modulation) wave are presented.