A VLLMS based harmonic estimation of distorted power system signals and Hybrid Active Power Filter design

This paper presents a Variable Leaky Least Mean Square (VLLMS) based algorithm for harmonics estimation in distorted power system signals. Further, for mitigation of these harmonics a Hybrid Active Power Filter (HAPF) with modified Pulse Width Modulation (PWM) control technique has been designed. Both simulation and experimental studies are carried out for evaluating the estimation and filtering performances. VLLMS provides improved performance in estimation compared to LMS and Variable Step Size LMS (VSSLMS). Further, HAPF exhibits improved harmonics filtering performance compared to both active and passive power filters.