电气化铁路自发自用型光伏储能系统及其控制策略

Self-consumption Photovoltaic Energy-storage System and Its Control Strategy in Electrified Railway

将光伏发电应用于电气化铁路,有助于推进铁路系统的节能减排以及光伏电能的就近消纳。针对电气化铁路光伏发电系统存在有功功率反送的问题,对其配置储能系统,组成背靠背光伏储能系统;在背靠背逆变器的控制方法中加入限幅器,在光伏系统MPPT控制的基础上引入限功率控制,并制定MPPT/限功率切换策略和系统整体功率分配策略,使背靠背光伏储能系统工作在完全自发在用的发电模式,避免影响电能质量,同时有助于牵引负荷更为合理地消纳光伏电能。最后,搭建了系统仿真模型,验证了所提背靠背光伏储能系统及其控制策略的有效性。

The application of photovoltaic （PV） generation to electrified railways will help to promote energy saving and emission reduction energy consumption and emission of railway systems and promote the local accommodation of PV energy.As the back-to-back PV system may cause reversed active power,this paper configures the energy-storage （ES） system to form a back-to-back PV/ES system.The limiters are added to the control method of back-to-back inverter and the limiting power control is introduced based on the MPPT control of PV system.The strategy for switching the MPPT control and limiting power control as well as the strategy of power distribution are designed.By means of the above improvements,the back-to-back PV/ES system operates in a completely self-consumption mode,avoiding affecting the power quality and at the same time helping the traction load to consume the PV energy more reasonably.Finally,a system simulation model is built,and the effectiveness of the proposed back-to-back PV/ES system and its control strategy are verified.