Modified Instantaneous Power Theory and Fuzzy Logic Based Controller for Grid-connected Hybrid Renewable Energy System with Shunt Active Power Filter Functionality

Abstract

This study suggests a controller for grid connected hybrid renewable system with shunt active filter functionality. The controller consists of a modified pq theory based inner loop and an adaptive fuzzy logic based outer loop. Positive sequence sinusoidal signal regulator and self tuning filter are employed for making the controller work satisfactorily under unbalanced and distorted grid voltage conditions. In order to verify the effectiveness of controller under different system conditions, numerical simulations are carried out for different cases. A laboratory prototype is developed and tested under steady state condition, and the results are found to be satisfactory.