True Three-Phase Bidirectional Switch Based Buck

Abstract

Abstract—Two bi-directional switch based three-phase buck

AC voltage controller is presented in this paper. The operational

principle of the proposed three-phase regulator is a direct

consequence of using two three-phase bi-directional switches in

the buck converter topology. The converter works on per phase

basis and therefore three phase output voltages remain same in

case of load unbalance. The topology has reduced number of

switches for a three-phase AC voltage control having output

voltage regulation, input current shaping and power factor

improvement capability. Reduced number of switches allows

simple control circuit, less switching loss, reliable operation and

low cost. Steady state analysis and simulation results of open and

closed loop control of the proposed converter are presented in

this paper. The voltage mode feedback control method used for

controlling the regulator shows acceptable regulation of the

converter output voltage. During sudden variation of load or

input voltage the controller adjusts the duty cycle to recover to

the desired output voltage.

Keywords—ac voltage controller;