连锁反应事故Facts在阻塞管理中的应用.连锁反应事故Facts在阻塞管理中的应用
上传时间: 2014-01-10
上传用户:lps11188
《软件工程中的真相和谬误》的英文版《Facts and Fallacies of Software Engineering》,介绍软件工程中常见的一些“事实”和“误解”
标签: Engineering Fallacies Software Facts
上传时间: 2014-01-03
上传用户:love1314
this file is contain important Facts aboute different programming langueges.
标签: programming different important langueges
上传时间: 2014-01-12
上传用户:sevenbestfei
this book is contain very important Facts about different programming languages.
标签: programming important different languages
上传时间: 2013-12-06
上传用户:1427796291
统一潮流控制器(UPFC)作为一种典型的Facts装置,综合了Facts元件的多种灵活控制手段,能同时或选择地控制线路的基本参数(电压、阻抗、相角),也可交替地控制线路上的有功和无功潮流,还可独立地提供可控的并联无功补偿。因此UPFC被认为是最有创造性,功能最强大的Facts元件。 首先,本文详细分析了统一潮流控制器的基本结构和工作原理。采用开关函数法建立了电压源型变流器的数学模型,并推导了统一潮流控制器在abc三相坐标系和dq旋转坐标系下的数学模型,该模型考虑到直流环节电容储能的动态变化过程,从而使其更适合于系统的动态特性分析。本文讨论的UPFC控制采用基于两相旋转坐标系下的非线性解耦控制方案,在UPFC的精确模型下具有可快速跟踪给定值的优点,且在dq坐标系下可以实现有功和无功功率的独立控制;在电容电压PI调节中加入电流反馈,使其更接近真实值。 其次,本论文在分析UPFC数学模型的基础上建立了UPFC在MATLAB平台上的仿真模型;然后利用MATLAB建立了三相环形电力系统,将UPFC模型应用到该系统中,着重研究了UPFC对电网电能质量的影响。首先研究了UPFC对故障系统中电网功率的影响以及UPFC对提高故障系统功率稳定性的作用;同时,对UPFC能够抑制无故障系统中系统接入电网时的功率冲击进行了研究。最后,通过仿真波形研究了UPFC对电网故障中电压跌落的补偿作用以及UPFC对正常系统电压的影响,结果发现,UPFC可以保持故障中的系统电压为正弦波。
上传时间: 2013-04-24
上传用户:1406054127
这600本书几乎包括了电气工程专业的所有内容。 例如:电子学最基础的 《Circuit.Analysis.Theory.And.Practice.》(电路分析)、 哈佛大学的经典教材 《The.Art.of.Electronics》(电子学的艺术)、DSP.Facts.and.Equipment。
上传时间: 2013-08-02
上传用户:lw4463301
要学MFC必看之书,由Jeff Prosise编写。下面是作者前言: The production of this book required the efforts of many people, but two in particular deserve to be singled out for their diligent, sustained, and unselfish efforts. Sally Stickney, the book s principal editor, navigated me through that minefield called the English language and contributed greatly to the book s readability. Marc Young, whose talents as a technical editor are nothing short of amazing, was relentless in tracking down bugs, testing sample code, and verifying Facts. Sally, Marc: This book is immeasurably better because of you. Thanks.
标签: MFC
上传时间: 2015-10-20
上传用户:waizhang
The production of this book required the efforts of many people, but two in particular deserve to be singled out for their diligent, sustained, and unselfish efforts. Sally Stickney, the book s principal editor, navigated me through that minefield called the English language and contributed greatly to the book s readability. Marc Young, whose talents as a technical editor are nothing short of amazing, was relentless in tracking down bugs, testing sample code, and verifying Facts. Sally, Marc: This book is immeasurably better because of you. Thanks.
标签: production particular required efforts
上传时间: 2016-07-15
上传用户:ve3344
PSCAD/EMTDC是加拿大马尼托巴高压直流研究中心出品的一款电力系统电磁暂态仿真软件,PSCAD(Power Systems Computer Aided Design)是用户界面,EMTDC(Electromagnetic Transients including DC)是内部程序。 EMTDC最初代表直流暂态,是一套基于软件的电磁暂态模拟程序。Dennis Woodford博士于1976年在加拿大曼尼托巴水电局开发完成了EMTDC的初版,编写这个程序的原因是因为当时现存的研究工具不能够满足曼尼托巴电力局对尼尔逊河高压直流工程进行强有力和灵活的研究的要求。自此之后程序被不断开发,至今已被广泛地应用在电力系统许多类型的模拟研究,其中包括交流研究,雷电过电压和电力电子学研究。EMTDC开始时在大型计算机上使用。然后在1986年被移植到Unix系统和以后的PC机上。 PSCAD代表电力系统计算机辅助设计,PSCAD的开发成功,使得用户能更方便地使用EMTDC进行电力系统分析,使电力系统复杂部分可视化成为可能,而且软件可以作为实时数字仿真器的前置端。可模拟任意大小的交直流系统。PSCAD V1 1988年首先在阿波罗工作站上使用,然后大约在1995年PSCAD V2开始应用。PSCAD V3以PC Windows作为平台,在1999年面世。目前最新版本的是PSCAD V4.2.1。 用户可以通过调用随EMTDC 主程序一起提供的库程序模块或利用用户自己开发的元部件模型有效地组装任何可以想象出的电力系统模型和结构。EMTDC 的威力之一是可以较为简单地模拟复杂电力系统, 包括直流输电系统和其相关的控制系统。 采用 PSCAD/EMTDC 进行的典型模拟研究包括: 一般的交流电力系统电磁暂态研究 直流输电结构和控制 Facts(灵活交流输电系统)元部件模型 由于故障、断路器操作或雷电冲击引起的电力系统的过电压研究 绝缘配合研究 谐波相互影响研究 静止补偿器研究 非线性控制系统研究 变压器饱和研究, 如铁磁振荡和铁芯饱和不稳定性研究 同步发电机和感应电动机的扭矩效应和自励磁研究 陡前波分析 研究当一台多轴系发电机与串补线路或电力电子设备相互作用时的次同步谐振现象 向孤立负荷送电 电力系统数字仿真实验室使用PSCAD/EMTDC主要进行一般的交流电力系统电磁暂态研究,进行简单和复杂电力系统的故障建模及故障仿真,分析电力系统故障电磁暂态过程。
标签: PSCAD实验指导教程
上传时间: 2016-02-16
上传用户:xixi略
It all started rather innocuously. I walked into Dr GT Murthy’s office one fine day, andchanged my life. “Doc” was then the General Manager, Central R&D, of a very largeelectrical company headquartered in Bombay. In his new state-of-the-art electronics center,he had hand-picked some of India’s best engineers (over a hundred already) ever assembledunder one roof. Luckily, he too was originally a Physicist, and that certainly helped me gainsome empathy. Nowadays he is in retirement, but I will always remember him as athoroughly fair, honest and Facts-oriented person, who led by example. There were severalthings I absorbed from him that are very much part of my basic engineering persona today.You can certainly look upon this book as an extension of what Doc started many years agoin India … because that’s what it really is! I certainly wouldn’t be here today if I hadn’t metDoc. And in fact, several of the brash, high-flying managers I’ve met in recent years,desperately need some sort of crash course in technology and human values from Doc!
标签: 开关电源
上传时间: 2021-11-23
上传用户: