GA Based Method of Eliminating Harmonics for Improving Spectral Output of Three Phase Inverter

Abstract

This work describes PWM modulation using harmonic elimination technique necessitates the solution of system of non – linear transcendental equation set representing the relation between the amplitude of fundamental wave and each order harmonic and the sinusoidal angle. Conventionally due to their higher complexity , these equations have to be schedule offline and the calculated optional switching angles are stored in look – up tables on interpolated by simple function for real time operation .The above technique involves the solution of Newton – iteration method is usually applied to solve the equation set but the convergence depend on the selection of initial value .All the above traditional selective harmonic techniques ,the lowest uneliminated harmonic and the total harmonic distortion factor are obviously enlarged largely which would do greater harm to the power system. The above limitation can be avoided by introducing GA approach with microcontroller implementation. Besides this, this work also improves the input power factor by providing three bidirectional switches are also reviewed.