Abstract: Harmonics is the main issue with UPS inverters. Because of the high switching losses incurred by sinusoidal & space vector type of modulation, selective harmonic elimination is coming up as an alternative for SPWM and SVPWM. In this paper the harmonics can be eliminated by the optimal selection of switching angle by using Selective Harmonics Elimination pulse width modulation (SHE-PWM) and adaptive hybrid technique. The adaptive hybrid technique utilizes Particle Swarm Optimization (PSO) and Artificial Neural Network (ANN). This is tested over a single phase nine level cascaded H bridge inverter with equal DC sources and is simulated under Matlab / Simulink environment. The resultant fundamental and harmonic voltages are analyzed. The results show that there is an effective minimization in harmonics with the switching angles thus obtained by this method. Thus real time switching angle is given by ANN. Hence Total Harmonic Distortion can be minimized
Keywords: Harmonics, Multilevel inverter, Artificial Neural network, Particle swarm Optimization, switching angle, UPS.
Title: Optimization of THD in Single Phase UPS Inverter
Author: E.Anandha Banu, Dr.D.Shalini Punithavathani
International Journal of Electrical and Electronics Research
ISSN 2348-6988 (online)
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