The Study On High Frequency Resonance Analysis And Suppression Method Of Railway Traction Power Supply System

The resonance accident of the railway traction power supply system will destroy the balance of the system and make the railway transportation unsafe.Therefore,it is very important to analyze the characteristics of high-frequency resonance and formulate effective methods for suppressing high-frequency resonance.The research work completed mainly includes: 1)The power supply system was studied.The advantages and disadvantages of several traction transformers and power supply methods were compared,the principle of AT power supply mode was studied.2)The harmonic model of traction network and the resonance characteristics of the system were studied.The π-type equivalent circuit model was built by using the multi conductor transmission line theory and the phase mode theory,the chain network model was established by "cutting method";The resonance characteristics were analyzed by using the equivalent circuit model of the system.3)The influence of harmonic source on high frequency resonance of traction power supply system was studied.The simulation model of traction power supply system was built and verified to be correct;The working principle of traction drive system was analyzed and the simulation model of CRH2 locomotive was built as the harmonic source model;The traction power supply system and harmonic source simulation model were used to construct the vehicle network joint model and based on the model and the control variable method,the high frequency harmonic resonance characteristics of the system were analyzed.4)The method of suppressing high-frequency resonance was studied.The working principle of passive filter was analyzed and the corresponding theoretical calculation was carried out;The influence of the filter on the traction power supply system was analyzed;Designed a single-tuning and C-type filter combination method to suppress high-frequency resonance and verified the rationality of the suppression method;Finally,it was concluded that the combined suppression method was more effective in suppressing high-frequency resonance.Figure53;Table5;Reference52...