基于SVG的市域铁路牵引供电系统供电方案

Power Supply Scheme of Traction Power Supply System for City Railway Based on SVG

针对市域铁路牵引变电所选址困难、外部电源投资大、再生制动能量利用不充分等问题,提出基于静止无功发生器(SVG)的市域铁路牵引供电系统供电方案,按照近期固定备用部分牵引变电所、远期全部牵引变电所投入的模式运作。在考虑供电距离增长带来的单供电臂负荷增大问题的基础上,建立近远期正常和解列工况下供电距离与SVG容量的关系模型并求解,探讨供电距离与SVG容量设计之间的关系;通过仿真验证模型的准确性,并给出近远期变压器容量统一的设计流程。以某市域铁路为例,从再生制动能量利用率、变压器的总容量和负载率及牵引变电所数量等方面对牵引供电系统传统供电方案与本文供电方案进行对比。结果表明:基于SVG的牵引供电方案减少了牵引变电所数量和变压器安装容量,提高了列车再生制动能量利用率,可缓解牵引变电所选址压力并节省投资和运营费用。

In order to solve such problems encountered in designing city railway as the difficulties of choosing the locations for traction substations,the enormous cost of external power supply and insufficient utilization of regenerative braking energy,a power supply scheme based on static var generator(SVG)for traction power supply system of city railway was proposed,according to the operation mode of fixed reserve traction substations in the near future and all traction substations in the long term.On the basis of considering the load increase of single power supply arm caused by the increase of power supply distance,the relationship model between power supply distance and SVG capacity under short-term and long-term normal working conditions as well as under the working condition of some substations out of operation was established and solved,and the relationship between power supply distance and SVG capacity design was discussed.The accuracy of the model was verified by simulation,and the uniform design flow of near and long term transformer capacity was given.Taking a city railway as an example,the power supply scheme of traction power supply system in this paper was compared with the traditional power supply scheme from the aspects of the utilization rate of regenerative braking energy,the total capacity and load rate of transformer,the number of traction substations and so on.Results show that,with the traction power supply scheme based on SVG,the number of traction substations and the installation capacity of transformers are reduced,and the utilization rate of regenerative braking energy is improved,the pressure of locating traction substations is relieved and the costs for investment and operation are saved.