DSP based control algorithm for three-phase four-wire shunt active filter without load and filter current measurement

In this paper, a novel control algorithm for three-phase four-wire shunt active power filter is proposed without measuring load and filter current with different load condition is proposed. The control theory and reference source current signal generation is based on Instantaneous Reactive Power theory. The idea is different from the conventional control approach based on sensing load and/or compensator current, hence reduces the number of current sensors. The net fundamental power is calculated by using control architecture which should be flow from source to load. The source currents are exactly in-phase with supply voltages and having sinusoidal nature after providing the compensation by the compensator. The proposed control technique has been simulated using MATLAB/Simulink and tested on TMS320F28335 floating point digital signal processor using processor-in-loop (PIL) process. The results demonstrate the viability of the proposed control scheme as per IEEE 519-1992 recommended harmonic standard limits.