Single-obese three-level regular-sampled selective harmonic elimination PWM

A new harmonic elimination PWM strategy for single-phase VSI and CSI invert ers is presented which closely approximates the exact switching angles prod uced offline for the harmonic elimination PWM (HEPWM) strategy. The new str ategy is developed using well known regular-sampled techniques which enable the calculation of the switching angles in real-time, allowing a simple an d efficient digital signal processor implementation. Experimental and compu ted results are presented in terms of total harmonic distortion and harmoni c performance to highlight the advantages of the strategy and to confirm th e theoretical experiments.