MODELING AND DESIGN OF A REVERSIBLE 3-PHASE SWITCHING MODE RECTIFIER

A reversible three-phase switching mode rectifier consisting of a four -active-switch and without current sensor is proposed. To achieve cont rollable power factor, clean sinusoidal input current, adjustable DC o utput voltage, and bidirectional power flow capability, a closed-form pulse width modulation (PWM) duty cycle function is derived. The popul arly used state space averaging technique is extended for modelling th e reversible three-phase four-active-switch rectifier. The space vecto r representation technique is then used to simplify the modelling proc ess without sacrificing accuracy and valid frequency range. Both stead y-state and small signal analyses are made. Results show that the prop osed closed-form control law for the rectifier can indeed achieve the desired property. Moreover, the rectifier also possesses a bidirection al power flow capability, which is useful for many applications. Final ly, a prototype hardware circuit was constructed and experimental resu lts are presented for demonstration. Guidelines for determining the LC parameters and the PI controller gains are described briefly in the t ext.