Pantograph-Catenary System Modeling And Active Control Research

With the rapid development of high-speed railway in China, the current collection in the high-speed state has already become an important constraint of operational security, while its stability mainly depends on the performance of pantograph-catenary system. When the train running, the pantograph rises and its slide contacts the catenary with a certain contact pressure to get current and import electric locomotive. However, with the increase of running speed, the dynamic contact between the pantograph and the catenary is becoming more unstable and complex, leading a variety of vehicle fault and pantograph fault to often occur and these faults seriously affect the normal operation of the train, bring huge economic losses and serious threat to the safety of the passengers. In order to improve the stability of the current collection, and ensure the safe operation of trains, the hybrid simulation method is adopted. This paper does some discussion and research in the system modeling and active control of pantograph-catenary system. The main contents of this paper include:1. Establish the finite element model and the vibration differential equation for catenary, and do modal analysis to calculate the natural frequencies and modal shapes of contact network. Then according to the calculated natural frequencies and the vibration model, calculate the various modal generalized quality, and get the displacement at the contact point between the contact line and pantograph by simulating.2. Design subspace identification experiment, using subspace identification method based on the input/output data of this experiment to identify the pantograph state space model. First, obtain initial estimates by using the MOESP method, and then use the least square principle to optimize and improve the initial estimates, finally identify results for system stability and accuracy to confirm the optimal identification model.3. Modeling the pantograph-catenary system by matching model of catenary and pantograph. The PID active control scheme is designed to reduce the fluctuating amplitude of the contact force and ensure the steady of current collection.