Solving switching angles for the inverter's selected harmonic elimination technique with Walsh function

The solutions of the switching angles for inverter's selected harmonic elimination method with Walsh function are the piecewise linear equations with the fundamental amplitude. However it is required to determine and search all feasible angle combinations to gain the solutions in the full range of variation of fundamental voltage. The searching time is very long, especially when a big number of switching angels is used. Based on the analysis of the mathematical model of unipolar PWM output waveforms with Walsh function, this paper proposes a method to solve the switching angles quickly in the full range of variation of fundamental voltage. The analysis of application shows that the proposed method is feasible, high-accuracy and strong real-time. Consequently, the application of Walsh function to inverters' selected harmonic elimination method is further practical