On the development of single-phase inverter its robust waveform control

This paper is mainly concerned with the study of robust waveform control for single-phase inverter. First, the power circuit and switching scheme are designed and implemented. In control aspect, a current controlled PWM scheme is first designed to let the filter inductor current closely follow its command. Then a two-degrees-of-freedom (2DOF) voltage robust waveform control scheme is designed. All the constituted controllers are designed according to the plant models estimated from the measured frequency responses. In addition to the analytic design, the intuitive approach is also introduced as an alternative to find the parameters of the proposed control scheme. Wherein, at the chosen nominal operating point, the transfer function of the voltage command feedforward controller is on-line adjusted to yield excellent waveform tracking performance. Then this transfer function is copied and used as the inverse model being set in the robust disturbance feedforward controller. Finally, a robust waveform controller is proposed to further eliminate the waveform tracking error.