电网

ABSTRACT With the development of installed capacity and power system interconnect scale, the importance of stable monitor and control is becoming more and more obvious. The phase angle is one of basic state variable of electric power system, so monitoring and controlling power angle and phasor of the bus voltage are the most important means.

随着电网装机容量的增大及电网互连规模的扩大，电网的稳定监视和控制越来越重要，而相角是反映系统最基本的状态变量之一，因此监视和控制发电机的功角和母线电压相量，将是电力系统稳定监视和控制最重要的手段。

The average amount of propagation of the line outages is estimated from the data. The distribution of the total number of line outages is predicted from the propagation and the initial outages using a Galton-Watson branching process model of cascading failure.

论文以国内某区域电网9年的历史数据作为样本数据，采用分支过程模型估计该区域电网连锁故障的传播速率及连锁故障灾难度的概率分布，揭示该电网的连锁故障风险水平。

In this paper, The power grid planning system that utilize the computer network, share the information of SCADA, Customer Information System, Production Management System, explore new mathematics model, help the user planning based on GIS technology, space load-forecast and decision making will be discussed. The system will help the power supply company to allocate power substation appropriate, bring great economic benefit with limited investment and improve its planning level.

本文探讨了如何通过计算机网络，共享自动化系统、营销系统、输配电管理系统等系统的已有资源，采用适当的数学模型，实现基于GIS的空间负荷预测和电网规划辅助决策功能，合理和适时地配置电源，优化网络的结构，使电网具有可扩展性和可持续发展的能力，从而使有限的投资可以发挥最大的经济效益，使目前的电网规划工作提高至一个新的水平，适应新形势的要求。

Through analyses and comparisons with other methods, the equation squared root method of current is applied for the distribution line loss. Aim at the shortcomings of traditional equation squared rood method of current, improved methods are presented. This papers presents the treatment of small power sources in distribution network and the loss calculation of transformer winding resistance. In addition, the method on the base of queue is applied for programs.

通过对当前较为成熟的几种配电网线损计算方法的深入研究，分析和比较了这些方法的不同特点，并针对传统均方根电流法的不足，提出了对配电变压器铜损的改进计算方法；提出利用等效容量的概念来解决小电源问题，使得在配电网理论线损计算中对小电源的处理变得简便易行；在配电网理论线损计算的程序实现上，引入了基于队列的设计方法，不仅极大地提高了计算效率，而且可以得到任意节点的线损数据，方便了线损计算和管理。

On the base of the power MIS database in the oilfield,the database of distribution line loss is constructed.Long-distance reading is applied for calculating the equation power,and the equation square root method of current is applied for the distribution line loss calculation.

在胜利油田现有的电力管理信息系统数据库的基础上，建立配电网线损计算数据库，利用胜利油田配电网广泛采用的远程抄表技术来计量各负荷点的平均有功功率、无功功率，并应用均方根电流法计算配电网线损。

The stress was the study of the new methods of calculation the harmonic voltage and the harmonic current, and a new concept of filter ratio to evaluate the actual effect of single harmonic filter was raised considering the background harmonics. As well, the calculation mode of the single harmonic filter was also given based on the concept of filter ratio; it can offer effect data to evaluate the actual filter ratio of the single harmonic filter. At the same time, a method of designing the single harmonic filter was given, too, considering the background harmonics of the power system. In this paper, both the computer analysis and the proven had been done. And the result was shown to be that the voltage aberration and the harmonic current were decreased, and that the actual filter ratio of single harmonic filter was raised. The reason that we must consider the background harmonics when designing a single harmonic filter was also expatiated in this paper.

重点研究了考虑电网背景谐波下谐波电压、电流的计算方法，提出了用滤波率来评价单调谐滤波器安装容量利用率的概念，基于滤波率，分别给出了不考虑、考虑电网背景谐波时，单调谐滤波器的计算模型，为定量分析和评价单调谐滤波器的实际补偿效果提供了依据：并以此提出了考虑电网背景谐波的单调谐滤波器计算机辅助优化设计方法，并经计算机仿真分析、论证，减少了负载母线谐波电压畸变率和注入系统的谐波电流，有效地提高了单调谐滤波器的滤波效果，阐述了单调谐滤波器的设计过程中要考虑电网背景谐波的理论和实际意义。

In the process of this item, after the mainly uncertainties affecting the network planning are detailedly researched, some flexible planning models such as Blind Number Method and Scenario Method are proposed. Because power network planning is a nonlinear, discrete, multi-peak, multi-objective and nondifferentiable problem, it is very hard to be solved. Ant Colony Algorithm is an advanced metaheuristic method and has potential to deal with network planning problems.

本项目的研究过程中，针对影响电网规划的不确定性因素做了深入的定性和定量分析，采用盲数理论和多场景技术建立了多种具有良好适应性和灵活性的电网规划模型；同时，针对电网灵活规划模型非线性、离散性、多目标及目标函数不可微等特点，对多种优化算法在处理此类问题时的性质进行了分析和对比，并最终采用蚁群算法较好地解决了电网灵活规划问题。

This paper analyzes the characteristic of dispatching automation system of power network at length , and anatomizes the function and structure , status and development of it deeply .

毕业论文字数：26283 页数：53）摘要：电网调度自动化系统是确保电网安全，优质和经济地发供电，提高电网调度运行管理水平的重要手段。本文对电网调度自动化系统开展了研究工作。

Basing on TI Corporation's DSP chips TMS320LF2407A as high-voltage protection system CPU in this article, AC analog which comes from high voltage power grid is converted to digital value which DSP can process by 14-bit A/D converter MAX125, monitoring the entire status of the high-voltage power grid in real-time, tripping off by controlling external relay quickly when abnormal operation happened, turn off the power grid to protect the power grid and other electrical equipment.

本文是基于TI公司的TMS320LF2407A型DSP芯片作为高压电继电保护系统的中央处理器。通过MAX125的14位A/D转换器采集高压电网中交流模拟量来转换为供DSP处理的数字量，从而进行数据分析处理，对整个高压电网的运行状况进行实时监控，当遇到不良运转时控制外部继电器迅速跳闸，切断电网，从而保护整个电网及其他用电设备。

Based on the detailed thermal calculation using backward pass;An optimization method based on genetic algorithm for optimal operation initial steam pressure of peaking lead was proposed.

0引言随着电力基础建设的快速发展，电网容量越来越大，电网容量的增大和电网峰谷差的增加，大容量机组已由过去的电网主力机组逐渐转变为调峰机组。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了