چكيده به لاتين
Nowadays, by increasing the usage of railway transportation systems, accurate performance of all systems and control subsystems is become vitally important. Dynamic braking control system is one of these subsystems that has the main role to provide safety and security in the rolling stock especially during the braking and saving regenerated energy. The objective of the dynamic braking control system is the control of the slip ratio while braking to prevent the train wheel from corrosion and provide a certain braking distance to increase the track line capacity. This study proposes a train wheel dynamic model with DC traction motor and all related components and equations to track a desired velocity profile in order to have an accurate braking distance and control the slip ratio during the braking. According to nonlinearity of the dynamic braking system, linear model by considering system structural uncertainties is presented to design a proper robust controller with high performance. Robust controller is designed based on the quantitative feedback theory and by considering the uncertainties templates and robust stability and model reference boundaries. In appendix, the proposed dynamic braking system with a cascade control structure by two proportional integral controller is used to emphasize the better performance of the robust control system and comparing the controllability of the DC traction motor with shunt and separately excitation. This control method by using feedback of the wheel Peripheral velocity and remove the error compared with the desired speed profile which is provide by the train automatic operation (ATO) system can control the braking distance. Eventually, the provided control signal can apply to the DC traction motor by using pulse width modulator (PWM). By this methodology applicable control torque is used to have an accurate braking distance and control the slip ratio. Comprehensive simulations are employed to show the effectiveness of the dynamic braking control system.
Keywords: robust control, quantitative feedback theory, dynamic braking system, wheel slip, DC traction motor
