Controlling harmonic distortion in power electronics using active power filters

Abstract

Power electronics are used in power systems extensively for power conversion and control, but can generate harmonic distortion in the current that is being drawn. Harmonic distortion can have deleterious effects on the power system, degrading power quality, system performance, and efficiency. Active harmonic filters have gained attention due to the decreasing price and improved availability of power electronics.This thesis discusses some of the conventional methods for correcting harmonic distortion using shunt-connected pure active filters. A novel circuit topology is introduced which utilizes a clamp circuit often used in electric drive systems, allowing the system to have less frequent switching and reduced switching power loss. Simulation results are presented, along with experimental data to confirm the operation.