电力地

Because of short of power sources in the altiplano, very long feed line of power distribution system have to be used when one of the substations is failed to operate, in order to g.

由于正在建设中的青藏铁路地处高原、电源稀缺，在某些变电所退出运行的情况下，不得已采用超长距离供电以保障对沿线负荷的电力供给，因此，超长距离供电线路的单相接地故障选线问题值得研究。

Its charge time is strongly dependent on the voltage and amperage of the electricity flowing through the grid.

它的充电时间是强烈地依赖于电压和通过电力网格的流动安培。

The authors combine the equivalent magnetic circuit in time domain with equivalent electric circuit in frequency one,and use it to analyze and calculate the specialities of a three-phase transformer successfully.

作者将时域中变压器的等效磁路法同频域中变压器的等效电路法有机地结合在一起，成功地用于分析和计算GIC作用时三相电力变压器的特性。

The authors research the algorithm for power system static voltage stability. Taking the modulus minimum eigenvalue of power flow Jacobian matrix as the criteria to weigh the weakness of power system, the active power injected into nodes equivalent is substituted by equivalent conductance to ground as well as the reactive power injected into nodes is substituted by equivalent susceptance to ground.

研究了电力系统静态电压稳定性算法，以潮流雅可比矩阵最小模特征值的大小作为衡量电网薄弱程度的标准，以等效对地电导代替节点注入有功功率，以等效对地电纳来代替节点注入无功功率。

The Three Gorges ship lift is a complicated and large system including windlass, electromotor, hydraulic pressure, structure, fluid and so on.

三峡升船机是一个包括机械、电力拖动、液压、结构和流体于一体的大型复杂时变系统，深入系统地研究升船机在提升过程中的整体动态特性将为三峡升船机的设计和制造提供技术基础，以保证三峡升船机建成后能可靠、高效地运行。

Load forecasting for power system is one of the important task of power utilities. Accurate load forecasting is helpful to planning generators starting and stopping in the interior of the electrical networks economically and reasonably, preserving the security and stability of power system, reducing the unnecessary circumvolving repertory capacity, making planning to overhaul the units in reason, ensuring the normal production and life of the society, effectively reducing the cost of generating electricity, increasing the economical and social benefit.

电力负荷预测是供电部门的重要工作之一，准确的负荷预测，可以经济合理地安排电网内部发电机的启停，保持电网运行的安全稳定性，减少不必要的旋转储备容量，合理安排机组检修计划，保证社会的正常生产和生活，有效地降低发电成本，提高经济效益和社会效益。

The design paramters can be used to measure various very well,and the calculation error and design complexing are reduced.

利用该设计能够很好地测量各项电力参量，极大地减小了计算上的误差和设计复杂性。

On the basis of getting the true and reliable monitoring datum, the methods of diagnosis algorithm based on state predicting are also discussed in this paper. A method based on BP artificial neural network is presented. A diagnosis model is also designed and emulated. The results of the emulations show that the algorithm is obviously better than that of the traditional three-ratio method, and the algorithm can accurately makes good judgments on the faults base on qualitative and quantitative analysis.

在获得真实可靠的监测数据的基础上，还进行了运行状态预测的故障诊断方法的探讨，提出了基于BP神经网络的故障诊断方法，建立了一个诊断模型，并对该模型进行了仿真，仿真结果表明该算法明显优于传统IEC三比值法等故障诊断方法，能够比较准确地定性和定量地对故障做出判断，为电力运营部门提供有用的决策依据。

Since the voltage not only has relationship with both the reactive power and the balance of reactive load, but also relies on the structure of network and capability of voltage regulation, the system takes all the factors above into consideration and adopts the methods as follows: realizing grading control and management according to the voltage level and region partition, realizing jointly regulation and information pool by the application of advanced software in local and central station, realizing the optimal control of reactive voltage based on the measurement data from the regulative automation system and the angle of the whole system, realizing the exact application of reactive compensator and the on-load tap appropriate changer for voltage regulation transformers , and realizing the balance of reactive voltage in local site.

随着调度自动化系统的日益普及，以及越来越多的电网中的有载调压分接开关和电容器补偿装置投入使用，本课题研究开发基于分级递阶的地调/中心站模式无功电压控制系统，由于电压既与无功功率和无功负荷平衡有关，又与电网结构、调压能力有关，所以系统考虑电压等级、按区域实施分级控制、分级管理，利用中心站和地调的电力系统高级应用软件的作用实现众多装置的联合调整，信息共享。

A Geomagnetic storm is possible to induce geomagnetically induced current and many illeffects in high-voltage power grid. Detail studies about the distribution, amplitude and effects of GIC in power grid are very important.

__ |a 地磁暴在高压电网中产生的地磁感应电流(Geomagnectically-induced current，简称GIC)对电力系统运行可能造成一系列有害影响，深入地研究其在电网中的分布、大小及影响等问题有重要意义。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。