Research On The High Speed Pantograph Control System

Pantograph current-collection system, as one of most important sub-system of the high-voltage traction system, has became one of the hottest study topic in the field of the vehicle experts, and the performance of this system has been the main block for the train to achieve maximum speed. Besides the optimized pantograph structure and electronic controller, a good current-collection also needs excellent stability and reliability, so as to adapt the bad applying environment, such as the high-frequency dynamic vibration. In the recent years, more and more scholars’research results have proofed that an active control method to the pantograph’s rising torque can also improves the current-collection quality significantly, except to optimize the pantograph’s structure, which aims to improve its aerodynamic mainly. In order to get a good current-collection, a study to the pantograph’s closed loop and active control method was carried out, meanwhile an efficient and stable pantograph control system was also proposed. All of those works will definitely produce a remarkable influence to the high speed train’s development.This paper is a study based on the pantograph control system, whose mainly aims is to get a better contact performance between the catenary and pantograph carbon strip, also improving the the controller’s output performance. With analyzing the foreign and domestic’s pantograph controller achievements, this paper is stretched in two parts, the pneumatic controller and the electronic controller. The main works finished in this paper are:1/According to the system research basic principle, a study to the high-speed pantograph control principle was firstly performed, including the system’s function requirements, I/O interface. In addition to this, the pantograph’s mechanism was also introduced, the kinematic problems of pantograph structure were deeply analyzed.2/By using the basic pneumatic system equations, the model of the pneumatic subsystem’s key components were constructed using the AMESim software platform, including the reducing valve with piloted function, the automatic dropping device, and the high-frequency switching valve. A study about the influence relationship between the valves and its key parameters were deeply analyzed under the AMESim software environment. All the works in this chapter will plays an important role for the following chapters.3/Concerning the electronic controller, a detailed logic analysis work about this sub-system has been done by considering the principle of failure-to-safety, and a feasible logic control case was put forward in the same time. The simulation about this case was carried out in the MATLAB/Simulink, the output of the system in the failure modes proofed that this case could covered any conditions of the control function requirements.4/A co-simulation to the pneumatic and electronic system has been performed, applying the Bang-Bang open loop active control algorithm to the piloted system. The results in any failure modes proofed the system’s reliability, availability, and validation, and the system’s behaviors showed that the system complied with the principle of failure-to-safety. The pneumatic and electronic matched well.5/The influence relationship study between the open loop active cosntrol algorithms and the system’s control performance has been done, by using the Bang-Bang, PWM, and the fuzzy Bang-Bang control algorithm. All the simulation consequences showed that those algorithms complied with the standard of EN50367. Besides, a discussion about the most optimize algorithm to the pantograph control system from the point of view such as the output precision, project, and the operation maintenance was carried out.