A Shunt Active Filter for reactive power compensation and harmonic mitigation

This paper presents a digital simulation of a 3Phi shunt active filter (SAF) for harmonic and reactive power compensation. The instantaneous harmonic and reactive compensating currents is desegregated in itpsilas three components viz., (a) fundamental reactive current (b) oscillating harmonic reactive current (c) oscillating harmonic active current. The resultant compensating current is injected to the point of common coupling (PCC) of the ac mains by a six pulse, hysteresis current controlled, voltage source inverter (VSI). A high performance hysteresis band modulation technique is proposed to maintain nearly constant device switching frequency. The hysteresis bandwidth is modulated as a function of the desired switching frequency, supply voltage, DC bus voltage and slope of the reference current. Responses of simulated model clearly reveal the desired performance of SAF.