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1、江蘇大學(xué)工程碩士學(xué)位論文摘要隨著電力電子技術(shù)的發(fā)展和生產(chǎn)力的進(jìn)步,各種大功率非線性電氣設(shè)備的廣泛應(yīng)用,諧波和無功問題在電力系統(tǒng)中己日趨嚴(yán)重,影響了電網(wǎng)的安全運(yùn)行,降低了供電系統(tǒng)的供電效率和供電質(zhì)量,因此電網(wǎng)的抑制諧波和無功補(bǔ)償成了一個(gè)緊迫的課題。論文針對(duì)兆順中板廠的幾種主要的生產(chǎn)設(shè)備進(jìn)行了負(fù)載電能質(zhì)量分析,找到其產(chǎn)生諧波和無功的原因,并針對(duì)兆順中板廠的負(fù)荷情況提出了諧波抑制和無功補(bǔ)償方案。系統(tǒng)采用了TCR+TSC+LC的諧波抑制與無功補(bǔ)償?shù)姆桨?。本文運(yùn)用改進(jìn)后的遺傳算法對(duì)LC濾波器進(jìn)行優(yōu)化,并用實(shí)例證實(shí)了該方法
2、是切實(shí)可行的。LC濾波器對(duì)諧波進(jìn)行濾波的同時(shí)還與TSC一起將負(fù)載補(bǔ)償?shù)饺菪裕偻ㄟ^TCR將功率因數(shù)回調(diào)到需要的范圍。系統(tǒng)克服了單獨(dú)的TSC系統(tǒng)不能夠無級(jí)調(diào)節(jié)無功以及響應(yīng)速度慢的缺點(diǎn);同時(shí)相對(duì)于FC+TCR系統(tǒng)來說,所采用的TCR系統(tǒng)容量要小得多,進(jìn)一步減少了TCR在系統(tǒng)在無功補(bǔ)償過程中所產(chǎn)生的諧波量,也降低了系統(tǒng)成本。靜止無功補(bǔ)償裝置控制系統(tǒng)設(shè)計(jì)的好壞直截關(guān)系到整套裝置的性能。本文介紹了混合式靜止無功補(bǔ)償模擬裝置中數(shù)字式控制器的軟硬件設(shè)計(jì)方法,對(duì)控制器的數(shù)據(jù)處理方法和控制策略進(jìn)行了詳細(xì)的分析。文中設(shè)計(jì)了不同于常
3、規(guī)做法的用于晶閘管投切電容器的過零檢測(cè)觸發(fā)電路,它以晶閘管兩端電壓的過零點(diǎn)作為電容器投切動(dòng)作產(chǎn)生的必要條件。關(guān)鍵詞:混沌遺傳算法,諧波抑制,無功補(bǔ)償,電能質(zhì)量,晶閘管投切電容器,晶閘管控制電抗器AbstractWiththedevelopmentofpowerelectronicstechniqueandtheadvancementofproductivity,varioushigh·powernonlinearelectricalequipmentsareappliedwidely.Thesecausehar
4、monicsandreactivepower.Thesituationbecomesincreasinglyseriousinelectricpowersystem.Itnotonlyinfluencesthesaferunningofelectricnetworkbutalsodebasestheefficiencyandqualityofpowersupply.Soharmonicdepressionandreactivepowercompensationbecomeallurgentsubject.Thi
5、sdissertationanalysesthequalityofloadpowerconsumptionaboutseveralmainproductionfacilitiesofZhaoshunstandlesssteelfactory.Itfindsoutthecausesofharmonicsandreactivepower.Inthispaper,aschemetosuppressharmonicsandcompensatereactivepowerisproposedaimingattheloads
6、ituationofZhaoshunstandlesssteelfactory.ThissystemadoptsthemethodofTSC,LCandTCRtOsuppressharmonicsandcompensatereactivepower.ImprovedGeneticalgorithmtooptimizeLCfiltersisutilized,andfactualexamplesaregiventoprovethemethod’Svalidity.LCfilterscanfilterharmonic
7、sandatthesametimecancompensateloadtobecapacitivestatusaccordingwithTSC,andthenadjustthepowerfactorbacktoneededrangebyTCR.AsingleTSCsystemcan’tadjustreactivepowersteplesslyanditrespondsslowly.Thispaper’SsystemovercomestheshortcomingofasingleTSCsystem.Andtheca
8、pacityoftheadoptedTCRsystemismuchlessthanFCandTCRsystem.Inaddition,thesysteminthispaperreducesfurthertheharmonicscomponentwhichisproducedduringthecourseofreactivepowercompensation.Furthermore,th