Energy losses on DC lines are far lower than on the traditional AC ones, which make transmission of energy over long distances uneconomic.
由于在传输过程中采用高压直流电缆输送的损耗要比传统交流电的损耗小得多，因此采用交流电远距离传送电力很不划算。
The Southwest power Pool of Texas is designing an integrated system of DC and AC transmission to enable development of 10 GW of wind power in western Texas.
德州的西南电力联营(Southwest Power Pool)正在设计一个直流交流综合系统使在西德克萨斯州的1千亿瓦的风力发电产物能传输出去。
The reason was that over the short distances spanned by early power grids, AC transmission suffers lower losses than DC. It thus became the industry standard.
选择交流电作为工业标准的原因很简单，在早期供电距离很短的电网里，交流电的损耗比直流电小。
As the transmission length reaches a certain distance, DC transmission becomes economically attractive over ac.
当输电距离足够长时，直流输电的经济性将优于交流输电。
Through comparison, a scheme of "ac generating, DC energy feedback" electr IC clo sed loop transmission loading test bench is suggested and the hardware diagrams and work principle are presented.
通过比较提出了“交流发电、直流能量反馈”电封闭式变速器加载试验台方案，给出了硬件结构图，介绍了工作原理。
The low voltage DC system is one of the most important equipments in converter station, which is closely associated with the safety and stability of DC transmission system and correlative AC system.
低压直流输电系统是换流站内重要设备之一，直接影响到整个直流输电系统及相关交流系统的安全稳定运行。
It should be noted that the DC transmission system does not contribute to the fault current flowing in the AC system5 during the AC faults.
应注意到，直流输电系统并不会增加交流系统故障时的故障电流。 收藏。
So far in studying harmonic problems caused by HVDO transmission, the ac and DC systems should be treated as a whole to obtain accurate results.
在研究高压直流输电所引起的谐波问题时，应该将交流和直流系统作为一个整体来计算，才能获得准确的结果。
The result indicates the nonlinear variable structure control can adjust the transmission power of DC line effectively, and assure the stability of the AC-DC system.
仿真结果表明，非线性变结构控制可以有效地调节直流线路的传输功率，保证交直流系统的稳定性。
The classical stability analysis theory is limitary to deal with bulk AC-DC hybrid transmission system.
大规模交直流混合输电系统的出现使得经典的电力系统稳定性分析理论受到了局限。
The influence on grid's transient stability margin and DC system is also studied while the power slope of north or south AC transmission system is taken as modulation signal respectively.
分别取北通道功率变化率及南通道功率变化率为调制信号对系统暂态稳定裕度及直流系统的影响；
The influence on grid's transient stability margin and DC system is also studied while the power slope of north or south AC transmission system is taken as modulation signal respectively.
分别取北通道功率变化率及南通道功率变化率为调制信号对系统暂态稳定裕度及直流系统的影响；
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