Hardware design and implementation of digital controller for parallel active filters

Industrial and domestic equipments actually use a large variety of electronic circuits, which have nonlinear impedance. They provide into the network non-sinusoidal currents which outcomes include higher losses for transformer or possible overheating or over-voltage. The parallel active filtering presents one of the adequate solutions to eliminate the harmonic pollution generated by inductive loads on the electrical supply networks. This paper presents the implementation of a digitally controlled parallel active filter for a three-phase rectifier with inductive load. The rapid modules of the system control, which are based on Proportional-Integral (PI) currents algorithm and Pulse Width Modulation (PWM) routine, are implemented using an FPGA platform. This paper investigates the bassband method of active compensator and describes the implementation flow of the digital control by means of the specified hardware.