查询词典 power grid

In order to study the negativesequence influence to regional power grid caused by autotransformer traction power supply system, formulas of NSeq current and threephase voltage imbalance were derived, based on current distribution analysis of AT traction power supply system and singlephase VVconfiguration train substation. Employing the "train diagram" method, the realtime voltageimbalance curve was obtained in a simulation study, as well as the factors that influence NSeq and some measures to restrain it.

为研究自耦变压器牵引供电系统对地区电网造成的负序影响，首先讨论了AT牵引供电系统、单相VV接线牵引变电站的电流分布，推导得出了负序电流、三相电压不平衡度的计算公式；然后结合"列车运行图法"开发了相应的仿真程序；最后通过一个实际算例，得到了实时电压不平衡度曲线，指出了负序大小的影响因素及相应措施。

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。

By adding an equivalent harmonic impedance in the branch circuit of power grid, this HAPF could force all the harmonic currents flow into passive power filters, which resulting in eliminating harmonic contamination more effective. And using the capacitive feature of PPF in the fundamental frequency, this HAPF could compensate fixed-capacity reactive power without increasing APF's burden. Moreover, in order to decrease APF's cost, the fundamental voltage will largely be endured by capacitor in view of the series resonance circuit tuned at the fundamental frequency, so the APF just bears little harmonic voltages.

其基本工作原理是：有源部分等效于在电网支路中串联了一个谐波阻抗，该谐波阻抗对基波电流不起作用，而对谐波电流产生很大阻碍作用，迫使谐波电流流入无源滤波器，从而达到滤除谐波的目的；同时新型注入式混合有源滤波器还充分利用了无源滤波器的无功补偿功能，在不增加有源部分容量的前提下，可以提供一定容量的无功功率；由于有源部分承受的电网基波电压不大，也没有基波电流流入，因此逆变器容量小，初期投资较小。

After years of practice and exploration, the company made great contributions to helicopter operations on patrol inspection of 500kv EHV electric power transmission line, live EHV transmission line insulator flush, hotline maintenance, wire setting-out, laser scanning and patrol inspection of UHV transmission line, filling in the gaps in the country and ensuring the safe stable operation of power network. The company has operations in the 500KV EHV Air Patrol, live maintenance, exhibition guide rope release, laser scanning and 1000KV Air Patrol operations and other special high-voltage electrical work on the helicopter filled a number of technical blank, to further ensure the security and stability of power grid to make an important contribution.

在多年的实践探索中，公司先后在500千伏超高压航巡作业、带电水冲洗绝缘子、带电检修、展放导引绳、激光扫描和1000千伏超高压航巡作业等直升机电力作业上填补了国内多项技术空白，为进一步确保电网的安全稳定运行做出了重要贡献。

In the HVDC engineering, it will produce a series of harmonic which than the fundamental frequency of power grid, and the harmonic have adverse effects with the power systems, equipment and power grids.

中文摘要：摘要：在高压直流输电工程中会产生一系列大于电网基波频率的谐波，而谐波的存在会对电力系统、设备及电网造成不良影响。

KV substation has two 110 kilovolt substation 13, 35 kV substation 86, the initial formation of a power supply and matching power grid construction, the coordinated development of power industry network.

有220千伏变电站2座，110千伏变电站13座，35千伏变电站86座，初步形成了电源和电网配套建设、协调发展的电力工业网络。

Superconducting magnetic energy storage can quickly respond to the power requirements of power system, which will improve the security and stability of power grid.

本文在简要论证电力安全的重要性的基础上，对SMES提高系统的安全稳定性的优越性进行了分析，并介绍了国家863计划项目"高温超导磁储能系统"的工作进展。

With the rapid development of modern electric power industry and the expansion ofthe power grid in China power system dynamics become more and more complex.

随着我国电力工业的快速发展，电网规模的逐步扩大，电力系统动态特性也变得越来越复杂。

The design of the calculation example imitates the gradually unloosening process of price competition in Chinese electricity markets; the power network security, LMP, operation cost of power system and congestion cost of power system are analyzed and compared; and the effect of applying the LMP based congestion management theory to North China power grid is researched.

算例的设计模仿了中国电力市场改革逐步放开价格竞争的过程，对不同模式下的电网安全、节点电价、系统运行费用、系统阻塞费用进行了分析比较，研究了基于节点电价的阻塞管理理论在华北电网的应用效果。

Considering the geographic dispersive distribution of large-scale offshore wind farms and the feature that doubly-fed wind power generators or direct-driven/ hybrid-driven wind power generators are mainly adopted in them, a power transmission topological structure of VSC-HVDC system corresponding to the connection offshore wind farms with power grid is proposed, and related control strategy is designed.

针对大规模近海风电场地理分布上高度分散以及主要采用双馈式或直驱/半直驱式风电机组的特点，提出了相应的电压源型变流器的高压直流(voltage source converter based HVDC，VSC-HVDC)并网传输拓扑结构，并设计了相应的控制策略。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。