Author : B.Srava and B.Seshur

The non-linear loads generate serious harmonic currents and reactive power to the distribution and transmission System, which results in a low power factor, leads to voltage notch and reduces the utilization of the distribution system. Uninterruptible power supply plays a major role in today’s commercial world which avoids the loss occurring due to the power failure. Among the appliances, inverter is one of the essential components that perform DC-AC conversion. In this paper, a hybrid technique is proposed to eliminate the harmonics ideally. The technique utilizes fuzzy logic and artificial neural network in the optimal selection of switching angles. A hybrid evaluation technique evaluates the obtained optimal switching angles that are attained from the fuzzy inference system as well as neural network. The proposed technique is tested with a three level H-bridge inverter and the resultant fundamental and harmonics voltage are analyzed. The results reveal the effectiveness of the technique in eliminating the harmonics that are generated from the inverter.

Keywords: Harmonics, Fuzzy logic, Neural Network, Switching angles, Multilevel inverter.

Article published in International Journal of Current  Engineering  and Technology, Vol.3,No.5(Dec- 2013)