A new control approach to three-phase active filter for harmonics and reactive power compensation

TLDR

The paper proposes a new control scheme for a parallel 3‑phase active filter to eliminate harmonics and compensate reactive power in nonlinear loads. The authors implement the filter as a voltage‑source inverter bridge with a DC‑bus capacitor, driven by a hysteresis‑based carrierless PWM current control that derives source‑reference and command currents from load currents, DC‑bus voltage, and source voltage, and evaluate it on a 3‑phase diode rectifier with capacitive loading. The active filter successfully meets IEEE‑519 harmonic level recommendations.

Abstract

This paper deals with a new control scheme for a parallel 3-phase active filter to eliminate harmonics and to compensate the reactive power of the nonlinear loads. A 3-phase voltage source inverter bridge with a DC bus capacitor is used as an active filter (AF). A hysteresis based carrierless PWM current control is employed to derive the switching signals to the AF. Source reference currents are derived using load currents, DC bus voltage and source voltage. The command currents of the AF are derived using source reference and load currents. A 3-phase diode rectifier with capacitive loading is employed as the nonlinear load. The AF is found effective to meet IEEE-519 standard recommendations on the harmonics level.