Control strategy of hybrid energy storage in regenerative braking energy of high-speed railway

Abstract

Regenerative braking energy (RBE) will be generated when high-speed train is in braking state, but the utilization rate of RBE is generally low. To solve this problem, based on the hybrid energy storage system (HESS), a scheme for energy storing and utilizing high-speed train RBE is proposed. In this scheme, the HESS is connected to the railway traction power supply system through the railway power conditioner (RPC) as the interface circuit. The control strategy of energy storage RPC is proposed by analyzing the compensation principle, then the power of two energy storage media is allocated. The effectiveness of the scheme is verified by simulation. The findings of the research suggest that the control strategy of energy storage RPC can not only effectively utilize RBE generated by high-speed train, but also improve the power quality and extend the service life of energy storage system.