高铁牵引供电系统综合补偿容量优化研究

Study on optimization of comprehensive compensation capacity of high-speed railway traction power supply system

大功率跨线动车组在时速250 km/h高铁上运行通过电分相时,引起牵引变压器过负荷严重,且易导致保护误动作。为此,提出一种基于潮流控制器的解决方案,分析电流分配机理,推导补偿控制策略。通过对潮流的均衡控制,使得动车组在两供电臂的负荷得到优化分配,均匀配置在牵引变压器的两绕组上,降低了其容量需求。同时,对于改善电能质量起到明显作用。此方案适合于改造既有或新建牵引变电所,仿真验证了其可行性与优越性。其满足优化潮流控制,改善了工程的技术经济性。

When the high-power cross line EMU runs on the 250 km/h high-speed railway and passes through the electric phase separation,the overload of the traction transformer is serious and the protection is easy to misoperate.Therefore,a solution based on the power flow controller(PFC)was proposed,the current distribution mechanism was analyzed,and the compensation control strategy was deduced.Through the balance control of power flow,the load of EMU in the two power supply arms is optimally distributed and evenly distributed on the two windings of traction transformer,which reduces its capacity demand.At the same time,it plays an obvious role in improving the power quality.This scheme is suitable for the reconstruction of existing or new-built traction substation,and its feasibility and superiority are verified by simulation.It’s satisfactory optimization of power flow control improves the technical economy of the project.