Vx接线潮流控制及补偿策略研究

Research on power flow control and compensation strategy of Vx connection

高铁运输组织具有波动性大、随机性强的特点。针对广泛采用的Vx接线牵引变压器具有3倍过负荷能力,仍然无法满足大功率动车组密集追踪运行时段的高过载需求,是时速为250 km/h高铁上尤为突出的现实问题,通过研究电流分解原理,负序、谐波、无功的映射关系,明确适用于工程应用的潮流控制及电能质量补偿策略。仿真验证不同工况下,潮流控制器对有功功率分配的能力,以及按需补偿各电能质量参数的效果。由此提出基于Vx接线牵引供电系统的潮流均衡方案。策略可在TF绕组间,从零负荷至满负荷区间灵活分配潮流;补偿度由0至1间按需补偿电能质量。研究结果较大程度降低了供电设备容量需求,可用于指导新建或改建牵引变电所的设计、运营。

In order to solve the following problems,the transport organization of high-speed railway is characterized by great fluctuation and strong randomness.The widely used Vx connection traction transformer has three times overload capacity,which still cannot meet the high overload demand of high-power EMU during the intensive tracking operation period,especially on the 250 km/h high-speed railway.It studies the principle of current decomposition and the mapping relationship of negative sequence,harmonic and reactive power,and defines the power flow control and power quality compensation strategy suitable for engineering application.The simulation results show that the power flow controller can distribute the active power and compensate the power quality parameters according to the demand.Therefore,a power flow equalization scheme based on Vx connection traction power supply system is proposed.The strategy can flexibly distribute power flow between TF windings from zero load to full load.The compensation degree is from 0 to 1 to compensate the power quality on demand.The research results greatly reduce the capacity demand of power supply equipment,and can be used to guide the design and operation of new or reconstructed traction substation.