Abstract
DC traction power supply system is an important part of urban railway transportation. Its modeling and simulation provide theoretical basis for the analysis of its failure mechanism and protection research. This paper establishes an integrated simulation model of rectifier unit-traction network-vehicle based on MATLAB/Simulink simulation platform. The correctness of the model is verified by comparing with the measured data. Taking bilateral power supply mode as an example, rail-to-catenary short-circuit and the current characteristics of single vehicle starting at different locations are analyzed respectively in detail. The characteristics of multi-vehicle starting current and remote short-circuit current are studied by simulation. Combining with the traditional feeder protection methods, a comprehensive protection algorithm based on integral value and average value of feeder current is proposed to effectively distinguish the two situations. The aim is to provide theoretical basis for improving the reliability of DC traction power supply system protection.
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