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Low Voltage AC system operating voltages from 120 to 600 VAC. 低压交流电系统中从120到600VAC的电压称为低压。
Medium Voltage AC system operating voltages from 601 to 15000 VAC. 中压交流电系统中从601到15000VAC的电压称为中压。
Back to back HVDC system had been used to join AC systems. 背靠背高压直流输电(HVDC)系统已经在交流系统连网中得到了应用。
The DC system is normally supplied from a battery charger system, which is supplied from the low voltage AC system. 直流系统通常由蓄电池充电系统供电,蓄电池充电系统由低压交流系统供电。
Like your body, the air conditioning compressor is the heart of the AC system, and Freon is the blood. 像你的身体一样，空调压缩机是空调系统的心脏，氟里昂就是流动的血液。
It is also used as a backup power for the ac system control and protection and for starting the APU. 同时也作为直流系统控制、保护及APU启动的备用直流电源。
The 115 volt ac system is supplied by two engine driven generators, APU driven generator or external power. 115伏交流电源由两台发动机驱动的发电机、APU发电机或地面电源提供。
As re-active power cannot be transmitted over DC lines, each AC system must supply the reactive power for the connected DC terminal. 由于无功功率不能通过直流线路输送,每个交流系统必须提供无功给所联接直流换流终端站。
The battery chargers maintain a charge on the station batteries, which supply power to the DC system if the AC system fails. 蓄电池充电器持续对变电站蓄电池充电。若交流系统发生故障,就由直流系统供电。
With the development of power grid, multi-infeed HVDC (MIDC) embedded in one AC system has emerged in south China power grid and east China power gird. 随着我国电网的发展，南方电网和华东电网出现了多馈入交直流系统。
An iterative algorithm for the interface between the HVDC dynamic phasor model and the AC system is then investigated by hybrid simulation. 通过混合仿真研究了HVDC动态相量模型与交流系统之间的接口迭代算法。
Westinghouse engineers eventually solved these problems by modifying Tesla's motor and developing a new AC system using three-phase, 60-cycle current. 西屋的工程师改良特士拉的马达，发展出使用三种相位以及60赫兹电流的新AC系统，终于解决了这些问题。
Comparing with 50Hz AC system and DC system, we can observe that the use of FFTS will bring a significant capital saving. 最后，对在我国应用分频输电系统的前景及经济效益进行了分析，结果表明该系统的应用可以节约大量资金。
The QSS (Quasi Steady State) model of converter which neglects the negative impedance of DC system will bring some errors when three phase unbalanced fault occurs in AC system. 当交流系统发生三相不对称故障时,忽略直流系统负序分量的准稳态模型将给交直流混合系统的仿真带来较大的误差。
Voltage stabibity trends to be serious in high voltage DC system connected into a weak AC system, and it becomes more complicated in multi-infeed HVDC (MIDC) system. 连于弱交流系统的HVDC电压稳定问题严重，特别是在多馈入交直流系统中。
Comparing with HVDC, the FFTS system not only can save an electronic converter terminal, but also easily lead branches, forming a network like conventional AC system. 分频输电与直流输电相比，不仅少了一端换流站，而且很容易引出支路并形成网络，有明显的优点。
This paper designed an additional controller by fuzzy control method.The additional controller makes AC system more steady by the HVDC emergency support. 本文采用模糊控制技术设计了附加控制器，通过控制直流系统的功率注入以保持交流系统的频率稳定。
In favor of this system are its simplicity and its saving with respect to other AC systems. 与其它交流系统相比，这系统的优点是它的简单和节约。
The dc system is capable of rapid response to changes in control setting, with dc power transfer changes occurring faster than in AC systems. 由于直流传送功率的改变要快于交流系统,直流系统对控制整定值能迅速作出响应。
This paper compares the commutation failure different results caused by AC system fault and missing pulse in the condition of prediction extinguish angle in ABB HVDC control and protection system. 比较了在ABB直流控制保护系统中采用预测型关断角的前提下,由于交流系统故障和丢失脉冲所引起换相失败的不同后果。