Title :
An improved control algorithm of shunt active filter for voltage regulation, harmonic elimination, power-factor correction, and balancing of nonlinear loads
Author :
Chandra, Ambrish ; Singh, Bhim ; Singh, B.N. ; Al-Haddad, Kamal
Author_Institution :
Dept. of Electr. Eng., Ecole de Technol. Superieure, Montreal, Que., Canada
fDate :
5/1/2000 12:00:00 AM
Abstract :
This paper deals with an implementation of a new control algorithm for a three-phase shunt active filter to regulate load terminal voltage, eliminate harmonics, correct supply power-factor, and balance the nonlinear unbalanced loads. A three-phase insulated gate bipolar transistor (IGBT) based current controlled voltage source inverter (CC-VSI) with a DC bus capacitor is used as an active filter (AF). The control algorithm of the AF uses two closed loop PI controllers. The DC bus voltage of the AF and three-phase supply voltages are used as feedback signals in the PI controllers. The control algorithm of the AF provides three-phase reference supply currents. A carrier wave pulse width modulation (PWM) current controller is employed over the reference and sensed supply currents to generate gating pulses of IGBTs of the AF. Test results are presented and discussed to demonstrate the voltage regulation, harmonic elimination, power-factor correction and load balancing capabilities of the AF system
Keywords :
active filters; closed loop systems; digital control; digital signal processing chips; electric current control; insulated gate bipolar transistors; invertors; load (electric); power factor correction; power harmonic filters; two-term control; voltage control; DC bus capacitor; DC bus voltage; DSP hardware; IGBT; PI controllers; carrier wave pulse width modulation; closed loop PI controllers; control algorithm; current controlled voltage source inverter; feedback signals; gating pulses generation; harmonic elimination; improved control algorithm; load terminal voltage regulation; nonlinear loads balancing; power-factor correction; reference currents; sensed supply currents; shunt active filter; three-phase insulated gate bipolar transistor; three-phase shunt active filter; three-phase supply voltages; voltage regulation; Active filters; Current supplies; Insulated gate bipolar transistors; Power harmonic filters; Power supplies; Power system harmonics; Pulse width modulation; Pulse width modulation inverters; Space vector pulse width modulation; Voltage control;
Journal_Title :
Power Electronics, IEEE Transactions on
