Abstract
This paper is to investigate the power system operation strategy for an electrified mass rapid transit ( MRT ) network to enhance the loading factors of main transformers. The train motion equation has been applied to find the mechanical power demand profiles of the train set according to various operation modes by considering operation resistance. The DC load flow analysis is executed to derive the electric power loading of each traction substation and the AC load flow analysis is then performed to solve the dynamic loading behavior of main transformers for each time snapshot. To improve the loading factors of main transformers, the proper strategy of unit commitment and load transfer by switching operation are determined for the MRT operation during the peak and off peak periods. The Taipei MRT network is selected for computer simulation to demonstrate the effectiveness of the proposed methodology. It is found that the loading factors of main transformers can be improved dramatically and the load balance among the transformers can be obtained by the proposed methodology.
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