Power-Quality Enhancer Using an Artificial Bee Colony-Based Optimal-Controlled Shunt Active-Power Filter

Variable speed drives (VSDs) use power electronic components as controlled switches which distort the sinusoidal current and voltage waveforms of AC grid due to harmonic injection at the point of common coupling (PCC). These harmonics and distortions are propagated through the power network and affect all other connected loads. So, the shunt active power filter (SAPF) is one of the proposed tools to mitigate these harmonics. In this paper, an artificial bee colony (ABC)based optimal-controlled SAPF is proposed to provide instantaneous reactive power compensation required for harmonic mitigation of a separately excited DC motor – as a dynamic load fed from uncontrolledbridge rectifier via a GTOthyristorized-DC chopper. The proposed technique uses three-phase hysteresis-current controller inverter connected with reactors as an active power filter. The dclink voltage of that inverter is controlled using PIDcontroller. Tuning of the PID-parameters depends on artificial bee colony optimization. The proposed ABCcontroller is employed to search for optimal controller parameters by minimizing the error signal as an objective function of a dc-link for the inverter. The performance of the proposed filter that called ABC-SAPF is carried out by simulation under steady-state and dynamic operations using MATLAB/ SIMULINK software. Also, these results are compared with other control approaches as ANN and fuzzy logic. The results show that it is an effective in enhancement dynamic of power quality and also the overall total harmonic distortion (THD) is minimized to safe-limit according to the harmonic restriction standards such as IEEE-519 and IEC 61000. Key-Words: Artificial bee colony, power quality, hysteresis current controller, shunt active power filter, Objective function, Scout and Onlookers, point of common coupling, total harmonic distortion.