论新一代牵引供电系统及其关键技术

On New Generation Traction Power Supply System and Its Key Technologies for Electrification Railway

与既有电气化铁路牵引变电所换相接入电力系统不同,提出新一代牵引供电系统,即在同一电力系统内实现电气化铁路无分相的同相贯通供电系统.本文讨论了与新一代牵引供电系统相关的三项关键技术:一是牵引变电所采用组合式同相供电技术,治理负序,取消变电所出口处的分相;二是新型双边供电技术,取消分区所处的分相,减小均衡电流及其对电力系统的影响,同时,调整功率因数,保证牵引网电压水平;三是牵引网分段供电与测控技术,将供电臂适当分段,运用同步测量技术,更准确、更及时地判别故障类型与部位,并把故障限制在最小范围内.文章还说明了系统的经济性和可靠性.

Unlike the traditional traction power supply system which enables the electrified railway traction substation to be connected to power grid in a way of phase rotation,a new generation traction power supply system without phase splits in power grid was proposed. Three key technologies of this system were discussed. First,the combined cophase traction power supply system was used for traction substation to realize negative sequence current control and eliminate phase split at the exit of substation. Second,new bilateral power supply technology was applied to eliminate the phase split at section post and reduce the influence of balance current on power grid. Meanwhile,power factor should be adjusted to ensure the voltage level of traction network. Third,the segment power supply and measurement control technology was used to divide the supply section into several segments and apply synchronous measurement technology to quickly and accurately diagnose fault and its location. Thus,the effects of faults can be limited to a minimum degree. Also,the economy and reliability of new generation traction power supply system were analyzed.