基于列车运行状态的城轨地面混合储能装置分时段控制策略

Research on Time-Phased Control Strategy of Urban Rail Ground Hybrid Energy Storage Device Based on Train Operation Status

城轨交通地面混合储能装置兼顾吸收列车剩余再生制动能量与作为备用电源驱动供电故障列车的功能。根据城轨交通供电系统实际运行状况,建立牵引供电系统仿真模型,分析在列车不同发车间隔下牵引网潮流变化情况,并由此提出基于列车运行状态的城轨地面混合储能装置分时段控制策略。该控制策略在发车间隔较大时因列车剩余再生制动能量与功率较大,采用电池优先响应模式,保证超级电容有足够容量响应大功率负载,避免制动电阻不必要的启动;发车间隔较小时因列车剩余再生制动能量与功率较小采用超级电容优先响应模式,减少电池使用容量,以提高电池的使用寿命。本文利用北京地铁实际线路参数,通过牵引供电仿真平台与混合储能实验平台对本文提出的控制策略的有效性进行了仿真与实验验证。结果表明,此控制策略能够有效地提高混合储能装置吸收剩余再生制动能量能力,增加电池的使用寿命。

The ground hybrid energy storage device of urban rail transit takes into account the functions of absorbing the remaining regenerative braking energy of the train and driving the power failure train as a backup power source.Based on the actual operation status of the urban rail transit power supply system,the paper establishes a simulation model of traction power supply system and analyzes the changes of the traction network power flow at different departure intervals of trains.Then a time-phased control strategy of urban rail ground hybrid energy storage device based on train operation status is proposed.The control strategy uses a battery priority response mode when the departure interval is large because the remaining regenerative braking energy and power of the train is large,so that the super capacitor has sufficient capacity to respond to the high power load,avoiding unnecessary starting of the braking resistor;When it is small,the super-capacitor priority response mode is adopted due to the remaining regenerative braking energy and power of the train,which reduces the battery usage capacity to improve the service life of the battery.Using the actual line parameters of the Beijing Subway,the traction power supply simulation platform and the hybrid energy storage test platform were used to simulate and verify the effectiveness of the proposed control strategy.Simulation and experimental results show that this control strategy can effectively improve the ability of hybrid energy storage device to absorb the remaining regenerative braking energy and increase the lifetime of the battery.