基于微电网的城轨再生制动能量回馈系统

Regenerative Braking Energy Feedback System for Urban Rail Transit Based on Microgrid

为减小再生制动能量的冲击性和间歇性,提出一种基于微电网的再生制动能量回馈系统,利用城轨出入口电动汽车的闲置时间,发挥其储能特性和可调度特性,平抑制动能量的冲击性和间歇性,为车站提供稳定的绿色电力。为使所提微电网再生制动能量回馈系统的安全可靠工作,设计了再生制动能量回馈控制,逆变器恒功率控制及电动汽车充放电控制,同时考虑到电动汽车充放电受荷电状态约束,提出了一种基于滞环比较器的协调控制方法,以实现再生制动能量回馈控制,逆变器恒功率控制的同时避免电动汽车过充或过放。最后搭建Simulink仿真模型对所提微电网再生制动能量回馈系统进行验证,结果表明:所提运行控制和协调控制方法是有效可行的,对再生制动能量的利用具有应用和研究价值。

In order to reduce the impact and intermittence of regenerative braking energy, a regenerative braking energy feedback system based on microgrid is proposed, which utilizes the idle time of the electric vehicle at the entrance and exit of urban rail to exert its characteristics of energy storage and dispatching, and suppresses the impact and intermittence of regenerative energy to provide stable green power for the station. Regenerative braking energy feedback control, inverter constant power control, and electric vehicle charging and discharging control are designed to guarantee safe and reliable operation of the proposed regenerative braking energy feedback system of microgrid. Considering that the charging and discharging of electric vehicle is constrained by the state of charge, a coordination control method based on hysteresis comparator is proposed to realize regenerative braking energy feedback control, constant power control of inverter and avoid overcharging or over-discharging of the electric vehicle. Finally, a simulation model is built to verify the proposed regenerative braking energy feedback system. The results show that the proposed operation control and coordination control method is effective and feasible, which provides certain application and research value for the utilization of regenerative braking energy.