电网

Finally, the possibility of the self-excitation's potential existence in the South China Power System under two typical operation conditions in the year 2005 is tested with the proposed criterion.

本文使用所提出的自激判据，通过大量的暂态稳定仿真计算分析了我国南方电网在2005年的两种典型运行方式下发生自激的可能性。

The sequential network analysis of single phase earth fault is conducted using the symmetrical component method.

部分城市电网主要以电缆作为送电线路，且使用紧凑型的全封闭式的开关设备及氧化锌避雷器，有些城市使用了不少耐压标准较低的电缆。

In every subarea system, the sequential quadratic programming algorithm is used to solve the optimization problem of the subarea system.

采用构造辅助问题的方法进行分布式并行计算，将大型互联电网最优潮流问题分解为多个子网的并行潮流优化问题，在每个子网中，采用序列二次规划法求解子系统的的优化问题。

The Army Corps of Engineers has put an electric fence in the Chicago Sanitary and Ship Canal.

军队已经在芝加哥卫生所和大运河装置了电网。

The Army Corps of Engineers has put an electric fence in the Chicago Sanitary and Ship Canal. The underwater barrier is meant to shock the carp into turning back.

陆军工程兵团在芝加哥环境卫生和航行运河设置了电网，这道水下屏障是用来电击鲤鱼，让它们返回原来的水域。

An universal algorithm of reliability evaluation of shipboard power systems is built, and the corresponding prior period research is put forward.

以船舶电网的拓扑结构设计中的可靠性研究为例，介绍了各种可靠性指标的计算方法，并指出了进一步的研究方向。

Firstly, simple and applied component model and net model were described in detail.

第一，详细分析了简单实用的配电网元件模型及网络模型。

A kind of digital synthetic reference sinusoidal generator having the function of synchronous with line voltage is presented by using digital method.

提出了一种采用数字合成的方法生成单相具有与电网电压同步的数字式基准正弦波信号发生器的方法。

By synchronizing the grid voltage vector with positive sequence, the improved synchronous reference frame method is very simple without the phase locked loop and calculations for sinusoidal function.

通过利用幅值积分信号的选频特性，本文提出了正序、负序基波提取器，该正序、负序基波提取器具有对电网基频偏差不敏感、适用于电压的正序和负序基波分量准确提取的优点。

The system has not only similar function to the traditional ACDCAC variable frequency system, but also compact structure, small volume and light weight. It can shape the input current into sinusoidal wave, with no harmonic pollution to grid.

其功能类似于传统的变频调速系统，而其结构紧凑，体积小，重量轻，并且输入电流为正弦波，对电网无谐波污染。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。