The system generates a direct current, so using it to power DC devices locally is more efficient than switching to the alternating current needed to feed it back to the grid.
该系统产生的电流为直流电，所以用来驱动本地的直流点装置比将其转化为交流电输入电网来的更有效率。
This article briefs the overall operation and maintenance situation of direct current (dc) system in Northeast power Grid Corp. in 2000 -2004.
介绍了2000 - 2004年东北电网公司直流系统的整体运行情况及管理情况。
The design of filtering equipments at dc side of the converter substations is relative to the security and economy of the high voltage direct current (HVDC) transmission system.
换流站直流滤波装置的设计关系到高压直流输电系统的安全与经济性。
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