Investigation of the improvement and control strategy of the energy-storage regeneration braking on metro vehicle

Abstract

The conventional energy-storage regeneration braking system using ultra-capacitor has some problems, for example, the capacity utilization ratio of the ultra-capacitor is not high, the pulsating quantity of current is large during the process of charging and discharging and the volume power of the corresponding converter is large. When the capacity of the system is great and the working voltage is high, these problems will result in the augment of the size, weight and cost of the system which will impact the reliability. Following the principles that the power is balanced during the regeneration braking, the DC voltage of the system is stable, the current pulsating quantity during charging and discharging is little and the influence to the power grid is tiny, this article provides the improvement methods of the energy-storage regeneration braking system in which the ultra-capacitor is working as the energy-storage element, and determines the control strategy of the main circuit according to the principles, which will lower the capacity of the energy-storage elements and the volume power of the system converter and reduce the influence to the power grid when the system runs. © 2011 Springer-Verlag.