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REACTIVE POWER CONTROL IN HVDC TRANMISSION SYSTEM
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TECHNICAL TECHNIC AL PAPER PAPER PRESENTATION PRESENTATION ON “REACTIVE POWER CONTROL IN HVDC TRANMISSION SYSTEM” ABSTRACT This paper describes about the influence & control of reactivepower in HV system. There are 2 kinds of links mentioned Monopolar & nipolar and the reac power !eneration & control & sources of reactive power are described. Tho sync synchr hron onou ous s moto motors rs when when oper operat ates es on nolo noload ad serv serves es as the the sync synchr hr condensers supplyin! reactive power" now#a days static V$% systems are use operation of those systems is presented. INTRODUCTION: t is well known that electric power !enerated in power plants in transmitte the load load centr centre e on three# three#pha phase se ac transm transmiss ission ion lines. lines. Howeve However" r" for bulk bulk transmission over lon! distances" hi!h volta!e dc 'HVDC( transmission lines pref prefer erre red. d. HVDC HVDC tran transm smis issi sion on poss posses esse ses s the the foll follow owin in! ! adva advant nta! a!es es over over transmission system) n HVDC transmission system" one or *+ conduc conductor tors s and smalle smallerr towers towers re,uired as a!ainst three conductors and tall towers in $C transmission syst HVDC transmission" therefore" costs less. -ault clearance clearance in HVDC is faster" faster" therefore therefore DC transmission system posses improved transient stability. i/e i/e of cond conduct uctors ors in in DC tran transmi smissi ssion on can can be be reduc reduced ed as as there there is no skin skin effect effect Two Two $C systems systems at differ differen entt fre,uenc fre,uencies ies can can be intercon interconnec nected ted throu throu!h !h HV transmission lines. -or powe powerr trans transmis missio sion n throu throu!h !h cabl cables" es" HVDC HVDC is is prefe preferre rred d as it re,u re,uire ires s no cha current and the reactive power. The additio additional nal cost cost of conve convertin rtin! ! the invert invertin! in! e,uip e,uipmen ments ts makes makes transmission uneconomical for low#power supply over short distances. However lar!e#power transmission over lon! distances" HVDC turns out to be economica a result" HVDC links are bein! used worldwide at power levels of several !i!aw with the use of thyristor valve.
-i!. -i!. show shows s the the basi basic c lay layout out of an HVDC HVDC tran transm smis issi sion on syst system em.. Tw syste systems ms $ and 0 are interco interconne nnecte cted d by the DC line. line. f power power flows flows from $ Read Foron 30this Days converter $ then operates as a rectifier and 0 as anupFree inverter. %everse power Sign to vote title from 0 to $ is also possible with 0 actin! as a r ectifier and $ as an inverter. $C fi Useful Not useful Cancel anytime. the $4.99/month. current harmonics !enerated by the converters from enterin! into Special offer forreduce students: Only systems. DC filters and smoothin! inductors 1d reduce the ripple in the dc volta
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throu!h !round or sea leads to hi!her conduction losses" electrolytic action and la potential !radients. 'a( Monopolar" 'b( bipolar n bipolar HVDC transmission" two conductors are used" one is positive other is ne!ative with respect to the !round as shown in -i!. $s stated before" neutral points are !rounded at both the ends. $s the positive and ne conductors carry e,ual currents" there is no earth current. n case one line is ope due to fault" the other conductor and the !round will form unipolar link and half rated power can be transmitted untill the fault is cleared. t is obvious from above bipolar system of HVDC is more reliable than the unipolar or monopolar system such" HVDC bipolar link is more commonly employed. $ typical bipolar arran!ement is described in what follows. APPLICATIONS OF HVDC TRANSMISSION SYSTEM -or !eneration" transmission" distribution" and utili/ation of electrical ene 5#phase $C systems are used universally and have a define superiority over HVD However in followin! particular applications. Hi!h Volta!e" Direct Cu Transmission 'HVDC( is a stron! alternative to 6HV#$C transmission and HV lines are preferred. 7 1on! distance hi!h power transmission by overhead lines. 7 Medium hi!h power submarine or under!round cables. 7 ystem interconnection by means of overhead lines" or under!round8subma cables" or back#to#back HVDC couplin! stations" or Multi#Terminal DC sy 'MTDC(. You're Reading a Preview 7 -re,uency conversion links H/8;:H/( (e.g. 9: 7 ncomin! lines in me!a#cities. Unlock full access with a free trial. n HVDC link $C power is convened by thyristor # convertor valves at end. The ener!y is transmitted Download in HVDC With formFree to the other end. $t the other end" Trial DC power is inverted to $C and fed into the receivin! $C system. -i!. illustrat typical bipolar HVDC link. $ 2#Terminal HVDC transmission system has a HVDC convertor sub#sta at each end and an HVDC transmission line in between. n case of back#to#b couplin! station" the convertor and invertor are at the same place and there" i HVDC line. Multi#Terminal HVDC inter connects 5 or more $C systems" by HV transmission lines. CHOICE OF HVDC TRANSMISSION SYSTEM Read Free For 30this Days Sign up totovote on title volta!e. HVDC system are selected as an alternative e
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favourable above @:: km" ::: M* when cost of 6HV#line8sub#station e
.2.@( ,. For In$'r&onn'&$"on -T"'l"n'#/ 0'$*''n $*o %.&. ##$'+# havin! own load fre,uency control. HVDC links have several advanta!es over a.c. li HVDC links form an asynchronous#tie . i.e the two a.c. systems interconnecte HVDC tie#line need not in synchronism with each other. HVDC interconnection is superior to 6HV#$C interconnection in respects and is selected due to its technical superiority. *ith HVDC interconnec power flow can be controlled" the fre,uency disturbances are not transferred" sh circuit levels remain unchan!ed at both ends" transient stability of $C networ both end can be si!nificantly improved. Aower flow throu!h the HVDC line can be ,uickly modulated reve chan!ed to dampen the power swin! in connected $C ?etwork. Thereby the sys stability can be !reatly improved. HVDC interconnection can provide a weak tie 'of lesser capacity( betw stron! and a weak $C ?etwork. This is difficult with AC interconnection. Most important task#of interconnector is to transfer re,uired amount of po in re,uired direction and to assist the interconnected $C. ?et#work to mai transient .stability. $C interconnectors have severe limitations. interconnections are without such limitations. HVDC system control can be modified to dampen oscillations in load an! Thereby the stability of both $C systems is#improved. 2. For B%&3$o0%&3 #n&(rono4# $"'#$%$"on#. *here two a.c. syst You're Reading a Preview are interconnected by a convertor sub#station without any a.c. transmission" inbetween uch a He#link #!ives anaccess asynchronous Unlock full with a free trial. interconnection between adBacent $C systems. The back#to#back couplin! stations can be located at suitable location" where to networks meet !eo!raphically and e(. Three or more $C networks can be interconnected asynchronous means of a multi#terminal HVDC network. Aower flow from each connected ?etwork can be controlled suitably. 1ar!e powers can be transferred. verall sta can be improved. $t present only one such scheme is under e
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characteristic of the inverter is !enerally not desirable and re,uires su modifications by providin! ade,uate var compensation. %elation between i!nition delay and phase displacement The reactive power soruces that are used vary switched capacitors to s var systems. The re,uirements of volta!e control and the costs dictate the choic the speed of response of the reactive power control under dynamic conditions. SOURCES OF RECTIVE POWER The reactive power re,uirements of the converter are met by one or mor the followin! sources) ( $C system 2( $C filters 5( hunt capacitors =( ynchronous condensers ;( tatic var system. These are shown schematically in fi!. -rom volta!e re!ulation" losses and stability considerations" it is not desir to draw rective power from the system e
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provide reactive power. These filters and shunt capacitors are mechan switched# $lthou!h these devices are less e.: controllin! the firin! an!le of the back to back connected thyristors" the current in reactor can be in!le phase thyristor controlled reactor Controlled. This is shown in -i!. -or α E ::" the current is ma
Master your Currentsemester control in TC%with Scribd Read Free Foron 30this Days Sign up to vote title The fundamental component of the inductor current is !iven by & The New York Times Useful Not useful where V is the rms volta!e across the TC%" G is thefundamental fre,ue 1
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Special offer for students: Only $4.99/month. reactance and σ is the conduction an!le related to αby the followin! e,uation.
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The variation of the lower order of the harmonics with conduction an!le shown in fi!. The variation of the fundamental and the total harmonic componen shown in fi!. The triplen harmonics in the lines are eliminated by the delta connection o three sin!le phase TC%s. The typical control system for a TC% is shown in -i!. *here the con si!nals are obtained from the volta!e and the reactor current. The controlle usually an inte!ral controller $ typical control system for a TC% *ith variable !ain to avoid the problems of contol istability. The au The control ran!e is abI which shows a positive slope which can be adBusted f the !ain in the current feedback path. The harmonics inBected by TC% into the system can be considerably redu either with wolve pulse arran!ement or with additional filters tuned to ;th and harmonics. CONCLUSION: You're Reading a Preview Thou!h static V$% systems are relatively e
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