城市轨道交通不同牵引供电制式的比较

目前我国城市轨道交通牵引供电制式以DC 1500V上部悬挂接触网为主,有些线路采用DC 750V三轨供电制式。随着城市轨道交通的不断发展,为节能减排提高能效,有必要提高牵引供电电压。近年来城际铁路和地铁的大力发展,使牵引供电技术和动车传动控制技术都得到了极大提高,无论是高铁或地铁动车都采用了先进的交流传动技术,不同的仅是高铁、城际铁路采用单相交流27.5 k V供电,而地铁采用的是DC 1500V供电。从技术上讲地铁也可采用与其上部绝缘净空尺寸相应电压等级的单相交流供电,这无疑是一种节能减排、减少地下杂散电流,又可与高铁、城际铁路线路贯通的新型模式。

On Different Urban Rail Transit Traction Power Supply Mode

Current urban rail transit power supply mainly adopts DC 1 500 V for overhead suspension contact,but some old lines are still supplied with three rail lines with DC 750 V.With the rapid development of urban rail transit,it is necessary to raise the traction power supply voltage from the energy-saving and upgrading efficiency point of view.In fact,the vigorously development of intercity railways in recent years has greatly improved the traction power supply technology and train drive control technology.Advanced AC traction drive technology is applied both in high-speed rail and subway,the high-speed intercity railway is supplied with 27.5 KV of AC power supply and the subway is supplied with 1 500 V of DC power supply.In terms of the power supply technology,subway could adopt upper insulation clearance size corresponding to the single phase AC power supply and the corresponding grade voltage,it is undoubtedly a kind of new mode featuring energy-saving and emission reduction,it could also reduce the underground stray current,and be connected with the intercity highspeed railways.