1Assistant Professor, Department of Electrical and Electronics Engineering, Sethu Institute of Technology, Kariapatti, Tamilnadu, India
2Professor, Department of Electrical and Electronics Engineering, Sethu Institute of Technology, Virudhunagar, Tamilnadu, India
Online published on 18 June, 2016.
Multilevel inverters are essential drives in industry as well as renewable energy power extraction schemes. Selective harmonics based multilevel inverters are well suited for harmonic free electrical power applications. However switching angles for SHE-PWM are hard to obtain since these involve solution of non-linear and transcendental equations. This proposed work solved the switching angles for an eleven level inverter with unequal sources using Genetic algorithm (GA) and Flower Pollination algorithm (FPA). The non-linear transcendental equations are made into an optimization problem. The optimized switching angles provided by both GA and FPA are used to form the look up tables for generating switching pattern off line for the hardware circuit. Both the hardware and simulation results are compared. FPA provides better performance in the sense harmonic content present in the output voltage is much lesser and speed of convergence is better in FPA than GA.
Selective Harmonic Elimination (SHE), Genetic Algorithm (GA), Flower Pollination Algorithm (FPA), Total Harmonic Distortion (THD), Cascaded H Bridge (CHB)
