Research on dual-PWM variable-frequency converter based on current predictive control

Abstract

A new dual-PWM variable-frequency converter is introduced because traditional converter has some drawbacks, such as low ac-side power factor, un-reversible power flow etc. On the base of general inverter, by introducing uncontrolled rectifier with PWM rectifier and employing current predictive control strategy in two static reference frames, dual-PWM variable-frequency converter can actively eliminate ac-side harmonic pollution of inverter, raise ac-side power factor, and work well with steady output voltage and bi-directional power flow. The experiment results are proved correct and feasible.