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1、此文档收集于网络，如有侵权，请联系网站删除XX大学学生毕业设计（论文）外文译文学生姓名：XX学号：XX专业名称：电气工程及其自动化译文标题（中英文）：交流不间断电源（ACuninterruptedpowersupply）译文出处：《电源工业》总第134期指导教师审阅签名：此文档仅供学习与交流此文档收集于网络，如有侵权，请联系网站删除外文译文正文：1.TraditionalacuninterruptiblepowersupplyUninterruptiblePowerSystem.Isakindof
2、containingtheenergystoragedevice,inverterasthemainpartoftheconstantvoltageandconstantfrequencyofuninterruptedpowersupply.Ismainlyusedtogiveasinglecomputer,computernetworksystemorotherpowerelectronicdevicestoprovideuninterruptedpowersupply.Whennormalma
3、insinput,UPSwillbeusedafterthemainsvoltagesupplyload,UPSisanacmainsvoltagestabilizeratthistime,atthesametimeitalsotothemachineinsidethebattery;Whenmainsinterruption(forcedoutage),UPSwillimmediatelyinternalbatterypower,continuetosupplytotheloadbythemet
4、hodofinverterswitch220valternatingcurrent(ac),theloadtomaintainthenormalworkandtheprotectionofcriticalloadofsoftwareandhardwarefrombeingdamaged.UPSequipmentusuallyistoprovideprotectiontoexcessivevoltageandthevoltageistoolow.Traditionalsingle-phase,thr
5、ee-phaseacinverterpointsinapplication,voltagetypeandcurrenttypeontheperformancepoints,pointsonthestructureofthebasicmultiplesuperpositioninvertersquarewaveinverter,phaseshift,multilevelinverter,softswitchinverter,etc.,pointsonthecircuittopologyofpush-
6、pull,halfbridgetypeandbridgetype,etc.,areusingPWMpulsewidthmodulationtechnology,theworkingprocessofastrongEMIinterference,causeseriouspollutiontothegrid,atthesametime,lowefficiency,wasteofenergy.Ifneed10kvaacoutputpower,thetraditionalinvertermustputmo
7、rethan12kwdcinputvoltage,alltransformintohighfrequencysquarewavevoltage,andthenthroughthelow-passfilterintoaquasisinewavevoltage(traditionalinverteroutput,foreverisnotreallyasinewavevoltage),existthefollowingproblems:(1)adoptthemethodofpulsewidthmodul
8、ation,thegenerationofhighfrequencyandhigh-powersquare-waveprocess,alsoisstrongEMIinterferenceproducedbytheprocess,highpowerdcconverterisequivalenttoahighfrequencypowerstation,itisconceivablethattheinterferenceisserious.(2)thepowertransformatio
