Research Of Status Identification And Monitoring In New Type At Power Supply System

The trunk’s completion of passenger line saw the golden era of China’s high-speed railway. And the main power supply system of China’s high-speed railway is AT power supply system, which has the advantages of high power, long distance, and low voltage loss. However, due to the complexity of its structure and nonlinear impedance, the judgment and positioning of short circuit is still difficult. Thus, the research of status identification and monitoring show its significance in railway’s safty.Based on the description of status identification and monitoring in (new type) AT power supply system, some conception around power flow was defined, and the method of operating status judgement by power flow was explained. According to the principle of control system, models AT powe system in single line and in parallel was simulated in MATLAB/simulink. Detailed analysis of different forms of short circuit in those models, changes of voltage and current of each port were displayed, the effectiveness of status identification and fault location was verified, and the accurate implementation of protection was proved. Therefore, a new type of monitoring system was established on the basis of theoretical analysis and model validation.Besides, comparative analysis of data synchronization acquisition, transmission, processing algorithms was included. In order to optimize this program, fault recording and data extraction methods was also taken into account.