高壓直流輸電換相失敗的研究.pdf

1、華北電力大學(xué)（北京）碩士學(xué)位論文高壓直流輸電換相失敗的研究姓名：黃玉東申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：電氣工程指導(dǎo)教師：文俊孫立20060401華北電力大學(xué)工程碩士專業(yè)學(xué)位論文摘要隨著高壓直流輸電技術(shù)突飛猛進(jìn)的發(fā)展，直流輸電技術(shù)在我國(guó)已得到了廣泛的研究應(yīng)用。換向失敗是直流高壓輸電過程中常見的故障。本文從理論上詳細(xì)分析了換向失敗的機(jī)理，簡(jiǎn)明闡述了引起換相失敗的原因、危害以及預(yù)防換相失敗的措施。用MATLAB軟件建立了電力系統(tǒng)直流輸電仿真模型，模擬

2、了單相接地短路故障、相間短路故障、換流器橋臂以及單橋故障，經(jīng)過近百次仿真運(yùn)行，得出了各種故障下的特性曲線，準(zhǔn)確描述了直流輸電系統(tǒng)在發(fā)生大擾動(dòng)后的暫態(tài)過程，并從理論上進(jìn)行了科學(xué)分析，得出了各種故障對(duì)換相失敗的影響。關(guān)鍵詞：高壓直流輸電：換向失??；數(shù)字仿真；建模：故障ABSTRACTWiththedevelopmentofthetechnologyofthehighvoltagedirectcircuittransmi豁ion(hyDe)H

3、VDCiswidelyinvestigatedandappliedinourcountryCommutationfailureisthecommonfaultsfortheHVDCThecauses，harmandmeasuresforpreventionfromthecommutationfailurehasbeenanalyzedinthispaperDCpowertransmissionsimulationmodelissetup

4、inthispaperwiththeMatlabsoftware，andvariousfaultssuchassingle—phasegroundingshortcircuit，phasetophaseshoncircuit，threephasecircuitgroundingshortcircuitandinverterbridgeshortcircuitaresimulatedinthismodelAfternearly100tim

5、essimulations，theCuIvesofcharacteristicsofeveryfaultareobtainedWiththesecurves，thetransientprocessafterserousdistortionintheDCtransmissionsystemisexpressed，andtheeffectsoncommutationfailurescausedbyvariousfaultsisobtaine