电气化铁路背靠背光伏发电系统及控制策略

Back-to-Back PV Generation System and Its Control Strategy for Electrified Railway

将光伏发电接入牵引供电系统,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。针对铁路牵引供电系统的特殊性,首次提出一种适用于电气化铁路的背靠背光伏发电系统及其控制策略。利用背靠背变流器的直流侧输出光伏电能,根据工况动态计算两侧变流器的最优电流,实现两侧变流器的独立控制,充分利用变流器的容量对牵引供电系统进行一定的无功和负序补偿,在自发自用的发电模式下,实现光伏电能的就近消纳,同时不影响牵引供电系统的电能质量。最后,搭建了系统仿真模型,验证了所提背靠背光伏发电系统的有效性。

Integration of PV generation to traction power supply system helps to reduce energy consumption and emission of railway system and increase local accommodation of PV energy. This paper proposed a back-to-back PV generation system for electrified railway and a control strategy based on special characteristics of railway traction power supply system. The PV energy was output from DC side of the back-to-back converter and optimal current of each converter was calculated dynamically according to working conditions. In this way, two converters could be controlled independently and both reactive power and negative sequence were compensated with the redundant capacity of converters. In energy self-balance mode, local accommodation of PV energy was realized without influence on power quality of traction power supply system. Finally, a system simulation model was built and effectiveness of the proposed back-to-back PV generation system was verified.