OPTIMAL PWM-SHE SWITCHING ON NPC INVERTER - A WINNING MATCH FOR HIGH-POWER CONVERSION

This paper provides a simple yet very effective method of real-time on -line solution for the PWM-SHE technique that readily accommodates the elimination of a particular set of harmonics. Piece-wise linear repre sentations of PWM-SHE switching angles are utilized to formulate the o n-line linear equations. A detailed analysis of linearisation and on-l ine capability of an optimized PWM specific harmonic elimination techn ique is described. A NPC inverter configuration is chosen. For high po wer conversion, application of the PWM-SHE switching pattern to the NP C inverter yields substantially low switching losses with excellent ou tput voltage/current waveform. (C) 1998 Elsevier Science S.A. All righ ts reserved.