Wavelet PWM technique for cascaded multilevel inverter

The wavelet PWM (WPWM) technique has been applied in the two-level inverters successfully, but it is impossible to apply directly the WPWM technique to multilevel inverters. This paper proposes two kinds of WPWM techniques suitable for a cascaded multilevel inverter, analyzes the control strategy with the WPWM and obtains the design of its parameters. The simulation results show the proposed WPWM methods can get high magnitudes of the output fundamental frequency component, low total harmonic distortion and simpler digital implementation.