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;
