Design Analysis and Implementation of Shunt Active Filter Based on Selective Harmonic Elimination Technique and p-q theory for Power Quality Improvement

Abstract

Harmonic is one of the most severe problems of power system. Harmonics are generated due to switching action of the power electronics converters, which are known as non-linear load. Traditionally it was suppress by the LC filter, known as the passive filter, are single tune or double tuned to some frequency. On the other hand the newly developed active filters are globally suppressing the harmonics. Active filters are superior compare to its rival conventional passive filters. This thesis presents some important result obtained from the simulation and hardware testing of shunt active filter. In this thesis, an active shunt filter for harmonic and reactive power compensation is analyzed. The theory of active power filters has been summarized. Various control techniques are discussed and simulation of shunt active power filter working on p-q theory and FFT based technique have been carried out under the different operating conditions and the resultant THD analysis compared with the available IEEE 519 standard. Finally FFT based compensation technique is selected for prototype implementation. Further the Hardware implementation of shunt active filter and testing results have been discussed and compared with the simulation results. Satisfactory results have been obtained, which are presented in this work.