ABSTRACT
This research presents effect of harmonic generated by variable frequency drives (VFD).In the past, electrical power system equipment and devices were designed to produce nearly sinusoidal voltage and current waveforms. However, nowadays, with much interest and wide spreads of power electronics equipment, for industrials, commercials and residential consumers, these equipment and other electronics devices are no longer operate with an ideal current and voltage waveform, because of the non-linearity of the equipment in nature, with this trend, a Recurrent Neural Network Algorithms with active power filter (SAPF) is implemented for harmonics mitigation on Variable Frequency Drive,because of its simplicity and accuracy among the artificial intelligent family controllers. Simulations were carried out using MATLAB/SIMULINK and SIMPOWER tool box environment to analyze the harmonics distortion. The total harmonics distortions (THD %) of current was calculated using relevant equations. The simulation results are in accordance with the recommended IEEE 519-2014 harmonic standard limits. However, the distortion harmonics in feeder supplying the VFD and soft starter equipment which led to frequent replacement of the drive or out of services also led the Distribution Control System Failure (DCS). 47.17% before and after the application of filter was reduced to 1.80%.