連鎖反應(yīng)事故Facts在阻塞管理中的應(yīng)用.連鎖反應(yīng)事故Facts在阻塞管理中的應(yīng)用
標(biāo)簽: Facts 連鎖 中的應(yīng)用 阻塞
上傳時間: 2014-01-10
上傳用戶:lps11188
《軟件工程中的真相和謬誤》的英文版《Facts and Fallacies of Software Engineering》,介紹軟件工程中常見的一些“事實”和“誤解”
標(biāo)簽: Engineering Fallacies Software Facts
上傳時間: 2014-01-03
上傳用戶:love1314
this file is contain important Facts aboute different programming langueges.
標(biāo)簽: programming different important langueges
上傳時間: 2014-01-12
上傳用戶:sevenbestfei
this book is contain very important Facts about different programming languages.
標(biāo)簽: programming important different languages
上傳時間: 2013-12-06
上傳用戶:1427796291
統(tǒng)一潮流控制器(UPFC)作為一種典型的Facts裝置,綜合了Facts元件的多種靈活控制手段,能同時或選擇地控制線路的基本參數(shù)(電壓、阻抗、相角),也可交替地控制線路上的有功和無功潮流,還可獨立地提供可控的并聯(lián)無功補償。因此UPFC被認(rèn)為是最有創(chuàng)造性,功能最強大的Facts元件。 首先,本文詳細(xì)分析了統(tǒng)一潮流控制器的基本結(jié)構(gòu)和工作原理。采用開關(guān)函數(shù)法建立了電壓源型變流器的數(shù)學(xué)模型,并推導(dǎo)了統(tǒng)一潮流控制器在abc三相坐標(biāo)系和dq旋轉(zhuǎn)坐標(biāo)系下的數(shù)學(xué)模型,該模型考慮到直流環(huán)節(jié)電容儲能的動態(tài)變化過程,從而使其更適合于系統(tǒng)的動態(tài)特性分析。本文討論的UPFC控制采用基于兩相旋轉(zhuǎn)坐標(biāo)系下的非線性解耦控制方案,在UPFC的精確模型下具有可快速跟蹤給定值的優(yōu)點,且在dq坐標(biāo)系下可以實現(xiàn)有功和無功功率的獨立控制;在電容電壓PI調(diào)節(jié)中加入電流反饋,使其更接近真實值。 其次,本論文在分析UPFC數(shù)學(xué)模型的基礎(chǔ)上建立了UPFC在MATLAB平臺上的仿真模型;然后利用MATLAB建立了三相環(huán)形電力系統(tǒng),將UPFC模型應(yīng)用到該系統(tǒng)中,著重研究了UPFC對電網(wǎng)電能質(zhì)量的影響。首先研究了UPFC對故障系統(tǒng)中電網(wǎng)功率的影響以及UPFC對提高故障系統(tǒng)功率穩(wěn)定性的作用;同時,對UPFC能夠抑制無故障系統(tǒng)中系統(tǒng)接入電網(wǎng)時的功率沖擊進(jìn)行了研究。最后,通過仿真波形研究了UPFC對電網(wǎng)故障中電壓跌落的補償作用以及UPFC對正常系統(tǒng)電壓的影響,結(jié)果發(fā)現(xiàn),UPFC可以保持故障中的系統(tǒng)電壓為正弦波。
上傳時間: 2013-04-24
上傳用戶:1406054127
這600本書幾乎包括了電氣工程專業(yè)的所有內(nèi)容。 例如:電子學(xué)最基礎(chǔ)的 《Circuit.Analysis.Theory.And.Practice.》(電路分析)、 哈佛大學(xué)的經(jīng)典教材 《The.Art.of.Electronics》(電子學(xué)的藝術(shù))、DSP.Facts.and.Equipment。
上傳時間: 2013-08-02
上傳用戶:lw4463301
要學(xué)MFC必看之書,由Jeff Prosise編寫。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.
標(biāo)簽: MFC
上傳時間: 2015-10-20
上傳用戶: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.
標(biāo)簽: production particular required efforts
上傳時間: 2016-07-15
上傳用戶:ve3344
PSCAD/EMTDC是加拿大馬尼托巴高壓直流研究中心出品的一款電力系統(tǒng)電磁暫態(tài)仿真軟件,PSCAD(Power Systems Computer Aided Design)是用戶界面,EMTDC(Electromagnetic Transients including DC)是內(nèi)部程序。 EMTDC最初代表直流暫態(tài),是一套基于軟件的電磁暫態(tài)模擬程序。Dennis Woodford博士于1976年在加拿大曼尼托巴水電局開發(fā)完成了EMTDC的初版,編寫這個程序的原因是因為當(dāng)時現(xiàn)存的研究工具不能夠滿足曼尼托巴電力局對尼爾遜河高壓直流工程進(jìn)行強有力和靈活的研究的要求。自此之后程序被不斷開發(fā),至今已被廣泛地應(yīng)用在電力系統(tǒng)許多類型的模擬研究,其中包括交流研究,雷電過電壓和電力電子學(xué)研究。EMTDC開始時在大型計算機上使用。然后在1986年被移植到Unix系統(tǒng)和以后的PC機上。 PSCAD代表電力系統(tǒng)計算機輔助設(shè)計,PSCAD的開發(fā)成功,使得用戶能更方便地使用EMTDC進(jìn)行電力系統(tǒng)分析,使電力系統(tǒng)復(fù)雜部分可視化成為可能,而且軟件可以作為實時數(shù)字仿真器的前置端。可模擬任意大小的交直流系統(tǒng)。PSCAD V1 1988年首先在阿波羅工作站上使用,然后大約在1995年P(guān)SCAD V2開始應(yīng)用。PSCAD V3以PC Windows作為平臺,在1999年面世。目前最新版本的是PSCAD V4.2.1。 用戶可以通過調(diào)用隨EMTDC 主程序一起提供的庫程序模塊或利用用戶自己開發(fā)的元部件模型有效地組裝任何可以想象出的電力系統(tǒng)模型和結(jié)構(gòu)。EMTDC 的威力之一是可以較為簡單地模擬復(fù)雜電力系統(tǒng), 包括直流輸電系統(tǒng)和其相關(guān)的控制系統(tǒng)。 采用 PSCAD/EMTDC 進(jìn)行的典型模擬研究包括: ? 一般的交流電力系統(tǒng)電磁暫態(tài)研究 ? 直流輸電結(jié)構(gòu)和控制 ? Facts(靈活交流輸電系統(tǒng))元部件模型 ? 由于故障、斷路器操作或雷電沖擊引起的電力系統(tǒng)的過電壓研究 ? 絕緣配合研究 ? 諧波相互影響研究 ? 靜止補償器研究 ? 非線性控制系統(tǒng)研究 ? 變壓器飽和研究, 如鐵磁振蕩和鐵芯飽和不穩(wěn)定性研究 ? 同步發(fā)電機和感應(yīng)電動機的扭矩效應(yīng)和自勵磁研究 ? 陡前波分析 ? 研究當(dāng)一臺多軸系發(fā)電機與串補線路或電力電子設(shè)備相互作用時的次同步諧振現(xiàn)象 ? 向孤立負(fù)荷送電 電力系統(tǒng)數(shù)字仿真實驗室使用PSCAD/EMTDC主要進(jìn)行一般的交流電力系統(tǒng)電磁暫態(tài)研究,進(jìn)行簡單和復(fù)雜電力系統(tǒng)的故障建模及故障仿真,分析電力系統(tǒng)故障電磁暫態(tài)過程。
標(biāo)簽: PSCAD實驗指導(dǎo)教程
上傳時間: 2016-02-16
上傳用戶: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!
標(biāo)簽: 開關(guān)電源
上傳時間: 2021-11-23
上傳用戶:
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