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简介：ThispaperintroducesoverallpolicyandeconomicenvironmentforpowerindustryinChina.Thepolicyenvironmenttendstobefavorable,whiletheeconomicenvironmentseemsworrisome.Thelatterismainlyduetoenergytransportationblockingandpriceescalating.Thepaperalsointroducestheperformanceanddevelopmentoflistedpowercompanies,andpointsoutthatthepowerstockmarketisstillpromisingandpowerindustryisstillvaluableforinvestment.

简介：ThispaperpresentsthebehavioranalysisofmodularmultilevelconverterunderDCpole-to-poleshort-circuitfault,whichisanimportantissueinfaultmanagement,electricalsystemdesignandMMCbasedpowersystemprotectionandcontrol.Firstly,thetransientbehaviorisanalyzedandtheconductionoverlappingangleγisdefined.Secondly,sevenpossibleshort-circuitcurrentpathsinducedbydifferentγvaluesareidentified,andthecorrespondingengineeringshort-circuitcurrentcalculationmethodsforbothACandDCsidesareproposed.Andthen,theinfluencesofimpedancedistributionfactorkandequivalentshort-circuitresistanceRSConshort-circuitcurrentsareelaborated.Finally,casestudyisusedtoverifytheeffectivenessoftheproposedanalysismethods.

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