5.5電流型逆變電路 Current source inverter circuit 中英版

Currenttypeinvertercircuit5.5電流型逆變電路TeachingResourcesDatabaseof

NationalVocationalEducationPowerSupplyTechnologyBilingualcourses.Powerelectronicstechnology電力電子技術(shù)Item5InverterCircuit項(xiàng)目五逆變電路圖1電流型單相橋式逆變電路及電流波形Fig.1Current-typesingle-phasebridge-typeinvertercircuitandcurrentwaveform1、電流型單相橋式逆變電路電路工作過(guò)程：Currenttypesingle-phasebridge-typeinvertercircuitworkingprocess:Currenttypeinvertercircuit5.5電流型逆變電路Load當(dāng)T1、T4導(dǎo)通，T2、T3關(guān)斷時(shí)，I0=Id；反之，I0=-Id。WhenT1andT4areonandT2andT3areoff,I0=Id;Ontheotherhand,I0=Id.當(dāng)以頻率f交替切換開(kāi)關(guān)管T1、T4和T2、T3時(shí)，則在負(fù)載上獲得如圖4.4.1（b）所示的電流波形。WhenswitchingtubeT1,T4,T2,andT3alternatelyatfrequencyf,thenyouwillgetthecurrentwaveformshowninFigure4.4.1(b).輸出電流波形為矩形波，與電路負(fù)載性質(zhì)無(wú)關(guān)，而輸出電壓波形由負(fù)載性質(zhì)決定。Theoutputcurrentwaveformisarectangularwave,independentofthecircuitloadproperties,whiletheoutputvoltagewaveformisdeterminedbytheloadproperties.主電路開(kāi)關(guān)管采用自關(guān)斷器件時(shí)，如果其反向不能承受高電壓，則需在各開(kāi)關(guān)器件支路串入二極管。Whenthemaincircuitswitchtubeadoptstheself-turn-offdevice,ifitsreversecannotwithstandthehighvoltage,itisnecessarytostringthediodeintothebranchoftheswitchingdevice.將圖1（b）所示的電流波形i0展開(kāi)成傅氏級(jí)數(shù),有：Thecurrentwaveformi0showninFig.1(b)isexpandedintoaFourierseries,asfollows:2、電流波形參數(shù)計(jì)算：Calculationofcurrentwaveformparameters:

Currenttypeinvertercircuit5.5電流型逆變電路圖1電流型單相橋式逆變電路及電流波形Fig.1Current-typesingle-phasebridge-typeinvertercircuitandcurrentwaveform其中基波幅值I01m和基波有效值I01分別為：Amongthem,thefundamentalwaveamplitudeI01mandtheeffectivefundamentalwavevalueI01arerespectively:圖2

電流型三相橋式逆變電路原理圖及輸出電流波形Fig.2Schematicdiagramofcurrent-typethree-phasebridge-typeinvertercircuit

andwaveformofoutputcurrent1、電流型三相橋式逆變電路工作方式:

Operatingmodeofcurrent-typethree-phasebridge-typeinvertercircuit:輸出電流波形和負(fù)載性質(zhì)無(wú)關(guān)，正負(fù)脈沖各120°的矩形波。Theoutputcurrentwaveformisindependentoftheloadnature,andthepositiveandnegativepulsesarerectangularwavesof120°each.輸出電流和三相橋整流帶大電感負(fù)載時(shí)的交流電流波形相同，諧波分析表達(dá)式也相同。ThewaveformoftheoutputcurrentisthesameasthatoftheACcurrentinthethree-phasebridgerectifierwithalargeinductiveload,andtheharmonicanalysisexpressionisthesame.輸出線(xiàn)電壓波形和負(fù)載性質(zhì)有關(guān)，大體為正弦波。Outputlinevoltagewaveformandloadpropertiesrelated,generallysinewave.輸出交流電流的基波有效值。ThefundamentalwaveeffectivevalueoftheoutputACcurrent.Currenttypeinvertercircuit5.5電流型逆變電路導(dǎo)電方式為120°導(dǎo)通、橫向換流方式，任意瞬間只有兩個(gè)橋臂導(dǎo)通。Conductingmodeis120°conduction,transversecommutationmode,onlytwobridgearmsconductionatanymoment.導(dǎo)通順序?yàn)?→T2→T3→T4→T5→T6，依次間隔60°，每個(gè)橋臂導(dǎo)通120°。這樣，每個(gè)時(shí)刻上橋臂組和下橋臂組中都各有一個(gè)臂導(dǎo)通。Theconductionsequenceis1→T2→T3→T4→T5→T6.Theintervalis60°,andtheconductionofeachbridgearmis120°.

Inthisway,ateachmomentthereisanarmconductionintheupperarmgroupandthelowerarmgroup.Thanksforwatching謝謝觀看-更多內(nèi)容，敬請(qǐng)關(guān)注國(guó)家級(jí)供用電技術(shù)專(zhuān)業(yè)教學(xué)資源庫(kù)-Formoreinformation,pleasepayattentiontotheTeachingResourcesDatabaseof

NationalVo