Analysis and Mitigation on Switching Transients of Medium-Voltage Low-Harmonic Filter Banks

Joon-Ho Kim,Jin-O Kim

doi:10.3390/en13092187

Abstract

This paper presents the switching transients of medium-voltage low-harmonic filter banks, which have alower back-to-back inrush current and higher transient recovery voltage (TRV) compared with capacitor banks. The switching transients of the filter banks are described by the analytical approach and field measurements for 150 MVA back-to-back filter banks are provided to support the switching phenomena described in this paper. As a mitigation measure of the high transient recovery voltage, a double-breaker type switchgear is analyzed in terms of the operating sequence and the time of the upper and lower breakers. From the analyses, an operation scheme for the double-breaker switchgear is proposed to avoid insulation failure of the breaker during the interruption by mitigating the transient recovery voltage across each breaker.

Highlights

A switchboard with a double circuit breaker structure is proposed, where two circuit breakers are connected in series to the switchboard, and the breaker damage caused by the transient recovery voltage can be minimized by sharing the transient recovery voltage with the two ciErnceurgiitesb2r02e0a, k13e, rxsF.OTR hPEeERswREiVtcIEhWboard consists of a bus vacuum circuit breaker (VCB), w12hofic1h5 is an upper breaker, and a load VCB, which is a lower breaker
This paper addressed the difference between the capacitor bank and the harmonic filter bank and analyzed the transient characteristics during back-to-back switching
The switching transients of the filter banks are described by the analytical approach and field measurements for 150 MVA back-to-back filter banks were provided to support the switching phenomena described in the paper

Summary

Introduction

TThhiiss llooaadd ggeenneerraatteess lloottss ooff ppoowweerr qquuaalliittyy iissssuueess aanndd hhaass ttoo bbee iinntteeggrraatteedd iinnttoo tthhee ggrriidd wwiitthh hhaarrmmoonniicc fifilltteerr bbaannkkss iinn oorrddeerr ttoo mmeeeett tthhee ggrriidd ccooddee[[66––1111]]..OOnneewwaayywwidiedleylyusuesdedfofroEr AEAFsFiss itsotionisntasltlalml mulutilptilpelelolwow-h-ahramrmonoincicsisningglel-et-utunnededfifiltleterrssffoorrththeemmitiitgigaatitoionnooffmmuullttiippllee hhaarrmmoonniicc oorrddeerrss ((FFiigguurree2)2.)T. CCaappaacciittoorr bbaannkkss,, wwhhiicchh aarree nnoorrmmaallllyy uusseedd ffoorr rreeaaccttiivvee ppoowweerr ccoommppeennssaattiioonn,, aarree ccoommppoosseedd ooff sseerriieess aanndd ppaarraalllleell ccaappaacciittoorr uunniittss. IInn aaddddiittiioonn,, iinndduuccttoorrss,, oofftteenn ccaalllleedd ccuurrrreenntt lliimmiittiinngg rreeaaccttoorrss,, aarree ppllaacceedd bbeettwweeeenn tthhee mmaaiinn bbuuss aanndd tthhee ccaappaacciittoorr bbaannkkss ttoo mmiittiiggaattee ttrraannssiieenntt iinnrruusshh ccuurrrreennttss dduurriinngg tthhee eenneerrggiizzaattiioonn,, aanndd oouuttrruusshhccuurrrreennttssffoorr aa sshhoorrtt--cciirrccuuiitt nneeaarr ttootthheeccaappaacciittoorrbbaannkkss..TThhee eeqquuiivvaalleenntt cciirrccuuiittss ooff tthhee ccaappaacciittoorr bbaannkkss aarree,, tthheerreeffoorree,,tthhee ccoommbbiinnaattiioonn ooff tthhee iinndduuccttaannccee aanndd ccaappaacciittaannccee iinn sseerriieess,, ssiimmiillaarr ttoo tthhee ssiinnggllee--ttuunneedd aanndd ddee--ttuunneedd fifilltteerrss iinn FFiigguurree 11. FFoorr ccaappaacciittoorr bbaannkkss,, tthhee vvaalluuee ooff tthhee ccuurrrreenntt lliimmiittiinngg rreeaaccttoorrss iissttyyppiiccaallllyy sseevveerraall hhuunnddrreedd mmiiccrroohheennrriieess. Avsotlhtaegsee c[2h6a]r.aActsetrhiesstiecschaaffreaccttetrraisntsiciesnatffpehcetntroamnseinean,ttphheecnaopmaceintoar, bthaenkcaapnadcitthoer hbaarnmk oannidc fithlteerhabramnkonmicufsitltbeer dbaisntkinmguuissthbede danisdtinangualiyshzeedd.and analyzed

Methods

Results

Conclusion