An optimal and flexible control strategy for active filtering and power factor correction under non-sinusoidal line voltages

This paper gives a new insight into the concept of load compensation under distorted voltages. Achieving both unity power factor (UPF) and perfect com pensation of current harmonics are not possible where a competition will ar ise between these two important factors. Through evaluating the present con trol strategies, a generalized, optimal, and flexible control strategy (OFC ) for harmonic compensation of utility Lines is proposed. The proposed cont rol strategy, which provide;, a unified and highly flexible compensation fr amework has the ability of programming for perfect current harmonics compen sation, or (UPF) accomplishment, or other newly defined objectives such as maximizing the power-factor subject to some adjustable constraints on the l evel of current harmonics and unbalancing via an on-line optimization algor ithm. The strategy can fulfill the IEEE-519 standards requirements, while g uaranteeing the best achievable power factor and optimum required rating fo r the compensator, Theoretical concepts and practical features of the propo sed control strategy have been shown through extensive simulation studies u sing MATLAB/SIMULINK programs.