PIL based control algorithm for three-phase four-wire active filter for reactive and harmonic compensation under distorted supply

In this paper, a novel control algorithm for three-phase four-wire shunt active power filter for the compensation of instantaneous harmonic current components in nonlinear loads is presented. Fundamental signal extraction is carried out using Harmonic Tuned Filter (HTF) without the Phase Locked Loop (PLL). HTF can efficiently determine the fundamental signal components from distorted voltage or current signal. Instantaneous Reactive Power Theory (IRPT) is used for reference current signal generation. The net fundamental power is calculated by using control architecture which should be flow from source to load. Indirect current control technique is used for the generation of switching signals. After providing compensation by APF, supply voltage and current are nearly in-phase which indicates power-factor improvement. The control technique is first simulated in MATLAB/Simulink environment and then co-simulated using processor-in-loop (PIL) technique on TMS320F28335 floating point digital signal processor. THD and PIL response prove that active filter is able to bring % THD with-in limits and as per IEEE 519-1992 standard limits.