CFT-Based On-Line Calculation for Optimal PWM Switching Angles

Because of the difficulty of calculating switching angles, the values of the angles were achieved by using the CFT and Matlab . Cascaded multilevel inverter was adopted in the structure of the main circuit in order to implement the multiple-phase shifting and meet the need of using the high voltage and large power equipments. In this paper a method to selected harmonic elimination(SHE) choosing initial values was presented in a single-phase full-bridge voltage source inverter . The online real-time control of SHE was realized. The simulation and the experimental results were separately done by Matlab and DSP. So the rationality of the design was verified .