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International Journal of Engineering & Technology Sciences
IJETS 2014, 2(6), 540-551
Three to Nine Phase Conversion Transformer, Modelling, Simulation and Harmonic Evaluation for Unbalanced and Nonlinear Loads
a Department of Electrical and Electronics Engineering Shiraz University of Technology, Shiraz, Iran
ABSTRACT
In many industrial applications a nine-phase ac supply is needed. So there is strong motivation to develop a system which convert available three-phase supply to multiphase supply such as nine-phase one. Several methods like using motor-generator sets, power converter, multilevel converter, etc. have been proposed before but in this paper a more practical transformer based topology which converts voltage of usual three phase supply to nine phase is presented. Simple design and implementation for high rating, pure sine wave and fewer harmonics are the salient features of the proposed model. Nine-phase static voltage supply with fixed voltage and frequency can be used for RL and nonlinear loads which produce current and voltage harmonics in the distribution systems. Complete design and simulation of the proposed structure with analytical calculation for nonlinear load is presented. Finally, the effectiveness of the proposed transformer connection for reducing total harmonic distortion is verified using MATLAB/SIMULINK software.