ELEN7056: Power Electronics Project - Power Electronic Device options for VSC HVDC Schemes

ELEN7056: POWER ELECTRONICS

Course Project: Power Electronic Device
options for VSC HVDC Schemes




Candidate
Student Name

Student Number
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I hereby declare this is my own unaided work, submitted in partial fulfillment for the
degree in Master of Engineering in Electrical

,ELEN7056 Project: Power Electronic Device Options for VSC HVDC Schemes




Table of Contents


1. INTRODUCTION..............................................................................................................................3
2. BACKGROUND................................................................................................................................4
2.1 Operatin Priiciples f oflaane Sfurce Cfiveraer (oSC VoDC...................................................4
2.2 oSC VoDC DEoICE OPTIONS.........................................................................................................7
3. INoESTIGATION OF oSC DEoICES...................................................................................................8
3.1 Cfmparis fi f GTO, IGCT aid IGBT Devices ................................................................................8
3.1.1 Cfis aructfinDes ini.................................................................................................................8
3.1.2 Oi-s aaae Behavifur.................................................................................................................10
3.1.3 Swiachiin Behavifur...............................................................................................................11
3.1.4 Prfaectfi...............................................................................................................................14
3.1.5 Reliabiliay................................................................................................................................15
3.2 ISSUES ASSOCIATED WITV oSC DEoICES....................................................................................15
4. CONCLUSIONS..............................................................................................................................16




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, 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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