Power Quality Improvement with Shunt Active Filter under Various Mains Voltage Using Teaching Learning Based Optimization

In this paper, instantaneous reactive power theory based a modified control algorithm is implemented for 3-phase 3-wire shunt active power filter to suppress harmonics and reactive power under non ideal source voltage. The reference current signals are generated by sensing the source voltage, load current and dc bus voltage. With these signals the gate driving pulses are generated via hysteresis band current controller. To check robustness of the control algorithm four different cases such as unbalanced, balanced distorted, unbalanced distorted main voltage and faults on load are considered. For more improvement in the performance of active filter, the Active filter is optimized with Teaching-Learning-Based optimization. The simulation work is carried out in MA TLAB/SIMULINK Power system block set. The performance of the implemented algorithm with Teaching-Learning-Based optimization is found quite effective and satisfactory under these conditions.