牽引供電系統(tǒng)的高次諧波的仿真與分析_碩士學(xué)位論文

《牽引供電系統(tǒng)的高次諧波的仿真與分析_碩士學(xué)位論文》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。

1、蘭州交通大學(xué)畢業(yè)設(shè)計(jì)（論文）牽引供電系統(tǒng)的高次諧波的仿真與分析摘　　要電氣化鐵道作為公用電網(wǎng)的非線性負(fù)載，已成為引起電力系統(tǒng)諧波污染的主要諧波源之一。這主要是因?yàn)樵陔姎饣F道上行駛的電力機(jī)車是單相的整流型負(fù)荷。由于功率大，分布廣，而且三相不對(duì)稱，在其運(yùn)行過程中必然會(huì)產(chǎn)生大量的高次諧波，并將在接觸網(wǎng)上激發(fā)起沿線分布的高次電壓和電流諧波，它們對(duì)電氣化鐵道沿線的通信系統(tǒng)會(huì)造成嚴(yán)重的干擾。隨著交直交動(dòng)車組在電氣化鐵道中的大量采用，使得牽引供電系統(tǒng)中的諧波特性發(fā)生變化，除了含有低頻帶的3、5、7次等諧波外，在高頻帶還出現(xiàn)了大量的高次諧波。盡管這些高頻帶諧波含有率不高，但其卻大大增加了系統(tǒng)發(fā)生

2、諧波諧振的可能性。當(dāng)系統(tǒng)發(fā)生諧波諧振時(shí)，會(huì)形成較大的過電壓和過電流，危害牽引變電所和電力機(jī)車等的絕緣設(shè)備，影響系統(tǒng)安全運(yùn)行。本文對(duì)電力系統(tǒng)的諧波特性做了詳細(xì)的理論研究和分析，重點(diǎn)闡述了牽引供電系統(tǒng)諧波的形成、諧波參數(shù)并對(duì)一些設(shè)備的諧波進(jìn)行了分析，以便可以更加深刻的理解牽引供電系統(tǒng)的諧波分布，諧波形成和控制，維持牽引供電系統(tǒng)的穩(wěn)定性和可靠性。最后，本文對(duì)牽引供電系統(tǒng)的高次諧波進(jìn)行了仿真、分析，更加直觀的展示了牽引供電系統(tǒng)的諧波特點(diǎn)及其分布，進(jìn)一步加深理解。關(guān)鍵詞：高次諧波；牽引供電；諧波電流放大；MATLAB/Simulink-33-蘭州交通大學(xué)畢業(yè)設(shè)計(jì)（論文）AbstractEle

3、ctrifiedrailway,asthenonlinearloadofpublicelectricnet,hasbecomeoneofmainharmonicsourcescausingharmonicpollutioninthepowersystem,whichismainlybecausethatelectriclocomotiverunningontheelectrifiedrailwayissingle-phaserectifierload.Onaccountofitsgreatpower,widedistributionandthree—phaseasymmetric,

4、itwillproduceagreatdealofhigh—orderharmonicsandonthecontactnetwillexcitehigh—ordervoltageandcurrentharmonicsdistributingalongtheline,whichwillinterfereseriously,withthecommunicationsystemalongtheelectrifiedrailway．WiththewideapplicationofAC—DC—ACmultipleunitsinelectricrailway,harmoniccharacter

5、isticinthetractionPowersupplysystemhasbeenchanged.Notonlythelow—orderharmonies,forexample,third—order,fifth—orderandseventh—orderharmonicwereincludedinthissystem,butalsoalotofhigh—orderharmonicwerecontained.Althoughthecontentrateofthesehigh—orderharmonicsverylow,thepossibilityofharmonicresonan

6、ceinthesystemwillgreatlyincrease.Whenharmonicresonanceoccurredinthesystem,overvoltageandovercurrentwillproduce,whichcanendangerequipmentinsulationoftractionsubstationandtrainandinfluencethesystemsafetyoperation.Inthispapertheharmoniccharacteristicofpowersystemtodoadetailedtheoreticalresearchan

7、danalysis,expoundsthetractionpowersupplysystemharmonicformation,andsomeequipmentharmonicparametersareanalyzed,sothattheycanmoreprofoundunderstandingofharmonicdistributionofthetractionpowersupplysystem,harmonicformationandcontrol,maintai