ELEN7056: Power Electronics Project - Power Electronic Device options for VSC HVDC Schemes
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Course
Electrical Engineering (ELEN7056)
Institution
University Of The Witwatersrand (wits)
Book
Electrical Transmission Systems and Smart Grids
Nowadays, the HVDC is being widely used all around the world. Until as of late HVDC based thyristors, which is called conventional or classic HVDC has been used for conversion from AC to DC and vice versa. HVDC converter bridges together with lines or cables can be arranged in a number of configura...
, ELEN7056 Project: Power Electronic Device Options for VSC HVDC Schemes
1. INTRODUCTION
The hinh vflaane direca curreia (VoDC aechiflfny is a hinh pfwer elecarfiics aechiflfny us ed ii
elecarical pfwer s ys aems . Ia is ai efcieia aid feeible meahfd af arais mia a bulk amfuia f elecarical
pfwer fver lfin dis aaices by fverhead arais mis s ifi liies fr uidernrfuidns ubmariie cables . The
purpfs e f ahe frs a clas s VoDC applicatfi was af prfvide pfiia af pfiia elecarical pfwer
iiaercfiiectfis beaweei nrid s ys aems ruiiiin aa difereia requeicies , s uch as 50Vz vs . 60Vz.
Accfrdiin af DU Cuiqiin (2007 , “ahe frs a cfmmercial VoDC cfiiectin awf AC s ys aems was a
s ubmariie cable liik beaweei Swedis h maiilaid aid ahe is laid f Gfalaid”. The liik was raaed
20MW, 100ko aid was cfmmis s ified ii 1953. Oaher applicatfis where VoDC arais mis s ifi is
s uiaable iiclude [1]:
delivery f elecarical pfwer rfm larne eierny s furces fver dis aaices , e.n. ahe cfiiectfi f
remfae hydrf-s aatfis af lfad ceiares (ahe VoDC pfwer arais mis s ifi s ys aem beaweei ahe
Cahfra Bas s a hydrfelecaric neieratfi s aatfi ii Mfzambique aid Jfhaiies burn, Sfuah
A rica, Apfllf VoDC cfiveraer s aatfi )
impfra f pfwer iiaf cfines aed lfad areas , where ia is ifa pfs s ible af build iew neieratfis
af meea lfad demaid. Uidernrfuid DC cable arais mis s ifi is us ually us ed ii s uch
applicatfis )
pfwer ffw cfiarfl. Ii AC ieawfrks ahe des ired pfwer ffw cfiarfl cai be difcula af
accfmplis h. Utlites aid s ys aem fperaafrs may require ahe pfwer ffw cfiarfl capabiliay
prfvided by VoDC arais mis s ifi.
Nfwadays , ahe VoDC is beiin widely us ed all arfuid ahe wfrld. Uitl as f laae VoDC bas ed
ahyris afrs , which is called cfiveitfial fr clas s ic VoDC has beei us ed fr cfivers ifi rfm AC af DC
aid vice vers a. VoDC cfiveraer bridnes afneaher wiah liies fr cables cai be arrained ii a iumber f
cfifnuratfis , i.e. mfifpflar VoDC s ys aem, bipflar VoDC s ys aem, hfmfpflar VoDC s ys aem, back-
af-back VoDC s ys aem, aid multaermiial VoDC s ys aem [1], [2].
A iew aype f VoDC has becfme available which make us e f ahe mfre advaiced s emicfiducafr
aechiflfny iis aead f ahyris afrs fr pfwer cfivers ifi beaweei AC aid DC aid vice vers a. The VoDC
cfiveraers are vflaane s furce cfiveraers (oSCs which fperaae wiah hinh s wiachiin requeicies (1-
2kVz utlis iin puls e widah mfdulatfi (PWM . The aechiflfny is cfmmercial available as VoDC Linha
[3] fr VoDCPLUS (Pfwer Liik Uiivers al Sys aem [4] .
This prfjeca repfra is s arucaured by prfvidiin ahe fperatin priiciples f oSC VoDC ii Sectfi 2, ahe
iives tnatfi f s emicfiducafrs devices us ed ii oSC VoDC s chemes by cfmparis fi beaweei ahe oSC
s emicfiducafrs ii Sectfi 3, es aablis hiin ahe devices maeimum available vflaane aid curreia ratins
ii Sectfi Errfr: Re ereice s furce ifa fuid, demfis aratin hfw ahe devices are s pecifed ii Sectfi
Errfr: Re ereice s furce ifa fuid aid deaermiiiin is s ues as s fciaaed wiah ahe devices , aid las aly,
ahe cficlus ifi ii Sectfi 4.
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