利用并联供电特点增加城轨交通整流脉波数的探讨

Discussion on Using the Characteristics of Parallel Power Supply to Increase the Rectification Pulse Number of Urban Rail Transit

在城市轨道交通中,由于常规的24、48脉波整流设备太复杂,目前普遍采用12(轻轨)、24(地铁)脉波整流方式。文中充分利用城市轨道交通中各整流站向牵引网并联供电的特点。在不增加设备数量和不改变整流站主接线方式的情况下,通过改变各整流站的输出相位,经牵引网自身阻抗的电感滤波。将现有城市轨道交通中的12、24脉波整流改进为24、48脉波整流。使牵引网中的脉动电流和脉动电压更低,减少城市轨道交通向电力系统输入谐波电流的含量。与常规的24、48脉波整流设备相比,主接线简单,设备数量减少一半。不仅降低了24、48脉波整流设备的成本,减少了设备检修和维护数工作量,从而提高了24、48脉波整流的可靠性。

In urban rail transit,because the conventional 24 and 48 pulse wave rectification equipment is too complicated,12(light rail)and 24(subway)pulse wave rectification methods are generally used.This article makes full use of urban rail transit.The characteristics of each rectifier station to the traction network parallel power supply.Without increasing the number of equipment and changing the main wiring mode of rectifier station.By changing the output phase of each rectifier station,it is filtered by the inductance of the traction network’s own impedance.The existing 12 and 24 pulse rectifier in urban rail transit is improved to 24 and 48 pulse rectifier.Make the pulsating current and voltage in the traction network lower,and reduce the content of harmonic current input from urban rail transit to the power system.Compared with conventional 24 and 48 pulse rectifier equipment,the main wiring is simple and the number of equipment is reduced by half.It not only reduces the cost of 24 and 48 pulse rectifier equipment,but also reduces the workload of equipment overhaul and maintenance,thus improving the reliability of 24 and 48 pulse rectifier.