Enhancement in Loop Filter of a Second Order Generalized Integrator - PLL by Using Proportional-Resonant Controller

Abstract

This paper describes a simple method for the estimation of amplitude, frequency and phase of an input signal with an improved performance for a second order generalized integrator phase locked loop (SOGI-PLL) using a proportional resonant (PR) controller. In order to enhance the performance of tracking which include steady state error, a PR control is suggested over proportional-integral (PI) control. The instantaneous tracking performance is improved because the PR controller resonates at fundamental frequency. The analysis and mathematical model of single-phase SOGI-PLL with PI and PR controllers are developed. The performances of these two controllers are compared for various tests under same circumstances. The results show that both PI and PR control can achieve good control effects but the PR control is simpler, better improvement of steady state accuracy and uses low cost computational resources. The effectiveness of the control is verified using simulation results.