特高压输电系统中磁控电抗器抑制工频过电压的研究

针对我国特高压输电线路中普遍安装的不可控电抗器,显著制约线路传输功率的缺点,本文采用磁控电抗器来限制特高压输电线路在长线空载电容效应、不对称接地和突然甩负荷三种工况下产生的工频过电压.对磁控电抗器抑制工频过电压基理进行分析,随后根据我国特高压线路的实际情况,用仿真软件分别分析了不同裳设方式下磁控电抗器抑制工频电压升高的...     

超高压可控并联电抗器录波回放系统设计

随着大电网互联和大容量、远距离输电系统的发展,电网对电能质量提出了更高的要求。在超高压线路中可控并联电抗器已成为系统稳定必要的设备,因此对可控并联电抗器录波回放系统的研究也就显得更加重要。该文主要研究的是可控并联电抗器的录波回放系统所工作的硬件环境及软件编程的流程图。     

高压线路并联电抗补偿特性及分析

随着电力系统的发展,装机容量的不断增加,高压输电线路电压等级不断提高,输电距离不断增加,从而引起电力系统电容电流以及容性无功功率的增长,导致电网电压偏高,分析了500kV输电系统并联电抗器的补偿特性,阐述了500kV并联电抗器开断的过电压及限制措施,并联电抗器对高压线路进行无功补偿的作用﹑意义,对电力系统的影响,以及并联电抗器的特性和作用。     

分级式高压可控并联电抗器微机在高压电网中的运用

分级式高压可控并联电抗器微机在高压电网中的应用越来越广泛,现就其版型、高压电网应用中仿真实例及特性、在高压电网中的控制原理、分级式可控无源滤波器工作原理4个方面进行了分析探讨。     

浙江省特高压电网规划研究

针对浙江省社会用电量持续增长与当地常规发电能源不足的矛盾,介绍了特高压交流输电技术以及我国特高压交流输电试验示范工程的开展情况,总结了浙江省电网的现状,分析了浙江省近期、中期、远期电力电量平衡情况,结合最新的特高压交流输电技术,提出了通过特高压交流输电线路将中西部电能输入东部的规划框架。仿真分析结果表明了该规划的可行性,为浙江省特高压电网的发展提供了指导依据。     

中国西电集团五种特高压输变电设备产品通过鉴定

西电集团研制的特高压交流1000kV320Mvar、1000kV240Mvar并联电抗器、±800kV特高压直流换流变压器、1700kV试验变压器和1100kV电容式套管五种产品顺利通过鉴定。以上产品的研制成功,不但满足了我国特高压交直流试验示范输电工程的需求。同时极大地提升了电力装备企业自主创新能力和市场竞争力。     

低压电抗器着火处理方法

详细介绍了低压电抗器在电网系统内实际运行中的基本方式,并从实用的角度分析了在平时运行中如何对低压电抗器设备进行监控和运行管理,同时对影响低压电抗器着火的各种因素进行了分析,并以500kV乔司变电站为例,介绍了在碰到干式电抗器发生着火时的应急处理方法。该处理方案对保障变电站内无功调节设备的安全运行具有重要的实际意义。     

动态功率因数补偿研究

本文介绍了电网功率因数的补偿原理 ,阐述了借助于晶闸管相控电抗器实现电网功率因数的动态补偿原理及实施补偿的两种方法。实验结果表明 ,所述方法能够很好地实现负载的动态功率因数补偿     

西变公司中标国内首批800千伏特高压电抗器

2005年7月27日，中国西电集团西安西电变压器有限责任公司与中国电力投资公司签订了6台800kV特高压并联电抗器的生产合同，其中包括3台10万kVar电抗器和3台7万kVar电抗器，合同金额近3600万元。这批产品是为新建的青海拉西瓦水电站生产的配套关键设备，也是目前国内电压等级最高、容量最大的电抗器产品，产品将于2007年11月交付使用。     

电能计量在智能电网与特高压中的应用

智能电网与特高压输电大力发展的环境下,智能电表在用户侧的推广应用,为电力系统安全稳定提供了大量可贵的数据信息。为保证电网中运行的智能电表可靠、有效地服务于智能电网,能够准确计量电能量值是智能电网与特高压输电发展重要的环节。为保障电网可靠运行提供数据支撑,为保证电量交易的公平、公正,电能计量在智能电网与特高压中有重要作用。     

New reactor dedicated to in operando studies of model catalysts by means of surface x-ray diffraction and grazing incidence small angle x-ray scattering

A new experimental setup has been developed to enable in situ studies of catalyst surfaces during chemical reactions by means of surface x-ray diffraction (SXRD) and grazing incidence small angle x-ray scattering. The x-ray reactor chamber was designed for both ultrahigh-vacuum (UHV) and reactive gas environments. A laser beam heating of the sample was implemented; the sample temperature reaches 1100 K in UHV and 600 K in the presence of reactive gases. The reactor equipment allows dynamical observations of the surface with various, perfectly mixed gases at controlled partial pressures. It can run in two modes: as a bath reactor in the pressure range of 1-1000 mbars and as a continuous flow cell for pressure lower than 10(-3) mbar. The reactor is connected to an UHV preparation chamber also equipped with low energy electron diffraction and Auger spectroscopy. This setup is thus perfectly well suited to extend in situ studies to more complex surfaces, such as epitaxial films or supported nanoparticles. It offers the possibility to follow the chemically induced changes of the morphology, the structure, the composition, and growth processes of the model catalyst surface during exposure to reactive gases. As an example the Pd(8)Ni(92)(110) surface structure was followed by SXRD under a few millibars of hydrogen and during butadiene hydrogenation while the reaction was monitored by quadrupole mass spectrometry. This experiment evidenced the great sensitivity of the diffracted intensity to the subtle interaction between the surface atoms and the gas molecules.     

Real time monitoring and intelligent control for novel advanced microwave biodiesel reactor

In this paper, a comparison between intelligent controllers (Fuzzy Logic, Neuro-Fuzzy and Adaptive), when they applied for a novel advanced microwave biodiesel reactor to produce the biodiesel not from pure oil but also from waste cooking oil and fats. This novel microwave reactor is designed to be capable of operating at commercial production rates (kg/h) instead of laboratory scale (g/day), and reduces chemical reaction time, from hours under conventional heating, to minutes. In this reactor, as modern chemical process involves high temperatures, high pressures and catalysts so the process flow is very complicated. It is well known that traditional controllers cannot achieve a good performance when the process to be controlled is characterized by high nonlinearities and parameter uncertainties so it requires the efficient control to handle these multivariable problems as well as to adapt to time varying dynamics. The designed controllers were based on LabVIEW to automatically and continuously adjust the applied power of microwave reactor under different perturbations, and full system real time monitoring.     

列管式反应器催化剂卸料专用机器人

针对列管式反应器的管束数量大、排布密集、内径小等结构特点和催化剂卸料作业特殊要求,设计了一种通过PLC控制,按照管束排布方式,能够自动寻管、自动进给、自动完成管束清理的专用机器人。阐述了该机器人的基本工作原理和本体结构、主要部件设计,并设计了基于西门子S7-214的控制系统。实际应用表明,该机器人工作可靠、卸料作业效率高、最大限度的减少了卸料作业对人体的伤害,完全满足列管式反应器催化剂卸料作业要求,在石化、冶金、电力等行业广泛应用的列管式装置的日常维护中具有广阔的应用前景。     

基于DSP的超高压线路微机保护装置的研究

随着我国电网容量的迅速增加和电压等级的不断提高,对超高压输电线路保护系统的性能提出了更高的要求。该保护系统以TMS320F2812为核心硬件平台,设有电流差动保护为主体的快速主保护。由工频变化量阻抗元件构成的快速Ⅰ段距离保护。相对于传统的线路保护系统在功能上有了较大的扩展。     

AP1000反应堆冷却剂系统主要设备安装技术

从反应堆冷却剂系统的组成和功能出发,分析了其主要设备的安装形式和技术要求。结合非能动先进压水堆反应堆（AP1000）冷却剂系统自身的特点,并在海阳核电站实践的基础上,阐述了反应堆压力容器、反应堆冷却剂主管道、蒸汽发生器、反应堆冷却剂泵、稳压器、波动管的施工流程,为后续核电站核蒸汽供应系统大型主设备的现场安装提供一定的技术参考。     

保险粉“四合一”旋转反应釜压力测量及无线传送

采用无线通信模块、数据采集模块、信号输出模块和有线压力变送器完成保险粉"四合一"旋转反应釜的压力测量和传送,并对测量和传送的系统构成和相关模块参数设置进行了阐述。     

Design and experimental analysis of an advanced static VAR compensator with computer aided control

This study presents integration of a real-time energy monitoring and control system with an advanced reactive power compensation unit based on fixed capacitor-thyristor controlled reactor (FC-TCR). Firing angles of the thyristors located in the FC-TCR are controlled by a microcontroller in order to keep the power factor within the limits. Electrical parameters of the system are measured by specially designed circuits and simultaneously transferred to the computer via a data acquisition board. Thus, real time data of the system can be observed through a visual user interface. The data obtained is not only analyzed for control process, but also regularly saved into a database. The system has been tested in laboratory conditions under different load characteristics and experimental results verified that the system successfully and accurately achieves compensation process against the all operational conditions.