摘要：This paper presents a Modified Gravitational Search Algorithm (MGSA) to
improve the performance of PI controller in varying load condition. The proposed
approach is capable of mitigating reactive power, neutral current, source current
THD and significant improvement in power factor nearly unity (0.997). The DC link
voltage across the capacitor is controlled by PI controller which is deciding the
performance of shunt APF. Hence, the robust optimization technique based integral
time square error (ITSE) with consideration of weight factor (α & β), maximum
overshoot (|∆v
n
|) and setling timet
− t
, is providing the optimum solution of
Kp & Ki. The robustness of proposed objective function and algorithm compared with
GSA based three other error criterion techniques. The efficiency of the proposed
controller has been tested over nonlinear and unbalance loading condition. The
performance of ITSE based MGSA-PI controller is batter then other three error
criterion techniques. The values of THD are below the mark of 5% specified in
IEEE-519 standard.
关键词：Modified Gravitational Search Algorithm (MGSA); Integral Time Squared Error (ITSE);;
Shunt APF; Unity Power Factor (UPF); Total Harmonic Distortion (THD).
