Harmonic Compensation Using On-Line Bacterial Foraging Optimization Based Three-Phase Active Power Filter

The active power filter has gained much more attention because of its effective performance to mitigate the harmonics. This paper presents shunt active power filter (SAPF) controlled by PI controller to compensate the harmonics. Also, it introduces a new artificial intelligent technique called Bacterial Foraging Optimization to optimize the parameters of the PI-controller through on-line self-adaptive self-tuning algorithm. This robust control scheme of the system makes improvement in the behavior of the active filter to eliminate the harmonic currents which occurred by the nonlinear loads in the electric grid. The hysteresis nonlinear current control method is used to generate the pulse gate required to drive PWM current-controlled voltage-source inverter of SAPF. Matlab/Simulink software package is used as a simulation to test and simulate the proposed system. Through the simulation results, it is observed that the response of the PI controller based on-line bacteria foraging optimization is quite satisfactory.