An Optimal Configuration Method of Super-capacitor Unit for Novel Railway Power Conditioner Energy Storage System

Abstract

The novel railway power conditioner based on super-capacitor energy storage system can not only comprehensively compensate the power quality problems of electrified railway but also absorb the energy produced by regenerative braking of high-speed rail train. However, the expensive investment cost of super-capacitor in which constrains its engineering application. It is necessary to study the configuration allocation of the super-capacitor to reduce its investment cost. In this paper, the utilization rate of regenerative braking energy is deduced, a mathematical model of a chance constrained programming based is established, in which the minimum one-time investment cost of super-capacitor is taken as objective, the optimal confidence degree under different utilization rates and corresponding investment costs are obtained. The results of practical example on investment costs of super-capacitor demonstrate that the approach is effective.