电网

The optimal configuration of sectioned switches in distribution network is a non-linear combined optimization problem, in which both economy and reliability should be considered at the same time.

配电网分段开关的优化配置是一个需要同时考虑经济性和可靠性的非线性组合优化问题。

The existing grid, tweaked and smartened to make better use of its power stations, should be infrastructure enough.

现有的电网调整优化后，能提高使用发电站输出电能的使用效率。

The existing grid, tweaked and smartened to make better use of its power stations, should be infrastructure enough.

现有电网优化后，能提高使用发电站输出电能的使用效率。

The existing grid, tweaked and smartened to makebetter use of its power stations, should be infrastructure enough.

现有的电网经过改造和修饰，可以更好地利用电厂，并足以提供基础设施。

Comparing with existing solutions, new method can utilize generators' speed signal measured by wide area measurement systems directly and detailed model and parameter of power system components were not needed. After sphering measurement-data, ICA with maximal negentropy criterion was carried out to obtain feature matrix. By this means high-dimension data of multi-machine perturbed trajectories were reduced to lower dimensions, and coherent generator groups were identified by pattern recognition consequently. Simulation results of 36-bus system with 8-generator and planning northwest China 750 kV power grid show that noise signals and bad data can be eliminated. This method is accurate in identifying coherent generator groups.

与现有方法相比，这种方法不需要获得系统元件模型和参数，而是直接球化广域测量系统(wide area measurement systems，WAMS)提供的发电机电角速度信号，再利用最大负熵准则进行独立分量分析得到特征矩阵，将高维数的多机受扰轨迹数据变换到低维空间，通过模式识别得到分群结果。8机36节点系统和西北750 kV电网规划系统算例表明，该方法能有效消除噪音和坏数据的影响，准确识别出同调机群。

Huazhong University of Science and Technology,430072,Wuhan,ChinaAbstract A digital simulation on Teed line and its system is presented in detail.

在高压电网中，随着电力系统的发展，从设备投资的经济效益与征地的困难出发，有可能出现三端或三端以上的多端输电线路。

The paper develops a testing system of electric energy acquisition terminal according to the demands of electric energy telemetering systems.

该系统投入使用后，大大提高了测试工作效率，为广东地区电网电能计量遥测系统建设顺利推进发挥了重要的作用。

On the foundation of the analysis,a fault diagnosis method which is an advanced pattern recognition method is proposed and a fault diagnosis system of generator excitation power unit based on virtual instrument is developed.It is proved by experiment that the fault diagnosis system can precisely judge which thirstier goes wrong and get accurate diagnosis result.

发生晶闸管直通故障时，瞬间将造成相电压短路，短路电流使保护电路动作；而发生晶闸管开路故障时(如晶闸管器件门极损坏或触发脉冲丢失等故障)，功率单元仍然工作，但输出励磁电压的脉动增大，平均值降低，这种带病工作导致励磁电压波形产生畸变，从而导致了发电机工作在不稳定状态，同时也加大了对电网的干扰[2]。

The paper takes the steam turbine valve actutors and control systems as the object of study, and the fast valving of regulating valves in case of electrified wire netting failure plays an important role. The disadvantages of electro-hydraulic control systems for steam turbine available are discussed, and the principle of the new system and its design method are presented, experimental study and theoretical analysis results concerning the steam turbine electro-hydraulic control system based on the new combination principle are reported in this paper.

本文把汽轮机蒸汽阀门电液执行机构及控制系统作为主要的研究对象，尤其是针对于电网故障时，调节汽门快关控制问题进行了深入的研究，指出现有汽轮机电液控制系统存在的问题，在继承和总结前人研究的基础上，提出了汽轮机电液控制系统组成原理的新思想与系统设计的新方法，对基于这种新原理的汽轮机电液控制系统进行了系统的理论分析与试验研究。

Using the model and states of vertexes, this paper present a new algorithm for loads of vertexes.

利用图论中邻接矩阵的描述含义，提出了配电网的分层拓扑模型。

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。