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On-line solution of switching angles of Selective Harmonic Elimination (SHE) PWM inverter has been a subject of research since 70s. Recent research has suggested new on- line control techniques for microprocessor implementation of SHE PWM method such as regular sampled harmonic elimination, space vector techniques, Walsh function harmonic elimination. A method based on curve fitting has been proposed in this paper. The solution trajectories by Newton iteration method are approximately represented by using 7 th order polynomial. On-line computation of switching angle (α) is just evaluation of polynomial equation by substituting value of modulation index (m). The complete solutions for unipolar switching pattern to eliminate 3rd to 23rd harmonics in the VSI output using conventional technique and curve fitting technique has been given. The deviations of actual and approximate solutions are also presented along with corroborative experimental results on a 1ph, 230V, 5kVA IGBT based VSI controlled by TMS320LF2406, 16-bit fixed point DSP processor.

On-Line Control of 1ph. She-Pwm Voltage Source Inverter for Statcom Applications