A Discrete Design Method for single-phase CVCF PWM inverters

In order to reduce the total harmonic distortion of Constant-voltage constant-frequency (CVCF) pulse-width modulated (PWM) inverter, a new approach of a discrete design method is proposed. In which a digital state feedback control (SFC) is achieved by pole placement, combined with a digital repetitive controller. The proposed control scheme can track the reference signal exactly even under the condition of complicated load conditions and interference. The performance of the whole system has been well demonstrated by simulations, which shows that the control method presented in this paper has the advantages of a good tracking effect, fast response speed, and less harmonic distortion.