Self-tuned PI Controller Based Hybrid Shunt Active Power Filter for Power Quality Enhancement

Abstract

The aim of this paper is to design a Self-Tuned Proportional and Integral Controller (STPIC) for Hybrid Shunt Active Power Filter (HSAPF) used for reactive power and harmonic compensation. In this control strategy, the Conventional Proportional and Integral Controller (CPIC) is re-formulated with an automated self-tuned approach to improve the control performance. The STPIC is a novel approach in which, according to the error signal the gains vary vigorously. Comparing Passive Filter with Active Filter the former is being bulky and design is complex and the later is not cost-effective hence a hybrid structure of Shunt Active and Shunt Passive filter is considered. MATLAB/SIMULINK models of HSAPF are developed to get a low distorted and in phase source current waveform at the input side. The compensation process for Shunt Active Power Filter (SAPF) is based only on source current extraction an approach different from conventional methods such as (p-q) theory or (id-iq) theory. The proposed system is tested at both steady-state, transient condition and its performance is then estimated and compared in terms of various parameters like Total Harmonic Distortion (THD), input power factor, percentage overshoot for CPIC and STPIC used for reference current estimation.