城轨柔性直流牵引供电系统光伏发电并入方式研究

Research on grid connection mode of photovoltaic power generationfor urban rail flexible DC traction power supply systems

针对城市轨道交通光伏发电功率并网问题,开展城轨柔性直流牵引供电系统光伏发电接入方式研究.基于柔性直流牵引供电系统结构,分析了光伏发电功率不同接入方式及其特点,建立了光伏接入柔性直流牵引供电系统情况下系统动态运行仿真模型,进行了多列车动态运行时光伏发电功率接入的仿真分析,阐明了光伏接入柔性直流牵引供电系统后潮流参数的变化规律及节能效果.研究结果表明,光伏发电并入城轨柔性直流牵引供电系统的功率会优先被附近列车吸收,有效降低了双向变流机组从交流电网吸收的能量,提高了系统运行的经济性.

To solve the grid connection problem of photovoltaic power generation in urban rail transit,the grid connection mode of photovoltaic power for urban rail flexible DC traction power supply system is studied.Based on the structure of flexible DC traction power supply system,different connection modes and characteristics of photovoltaic power generation are analyzed.The dynamic simulation model of the flexible DC traction power supply system with photovoltaic power connected to the DC side is established,and under the condition of multiple-train dynamic simulation,the system with photovoltaic power generation are analyzed.Then,the power flow parameters and energy-saving effect with photovoltaic power connected to the flexible DC traction power supply system are expounded.Results show that when the photovoltaic power generation is incorporated into the flexible DC traction power supply system,the power is first absorbed by the nearby trains,which effectively reduces the power absorbed by bidirectional converter units from AC power grid,and improves the economy of system operation.