A New Strategy for Synchronization of Grid-connected Solar Photovoltaic Generation

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Volume 1, Issue 2, Feb -2017
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   ISSN (Online) No: INTERNATIONAL JOURNAL OF RESEARCH REVIEW INENGINEERING AND MANAGEMENT (IJRREM) A New Strategy for Synchronization of Grid-connected Solar PhotovoltaicGeneration V.Lakshmi Narayana Moorthy*PG Scholar, Department of EEE,Adhiyamaan olle!e of En!ineerin!, os#r $ %&'(), +amilnad#, ndia.-lnmoorthy((!mail.comDr.V.+amilsel-an.Department of EEE,Adhiyamaan olle!e of En!ineerin!, os#r $ %&'(), +amilnad#, ndia.tamil//()!mail.com Abstract +his paper presents the interconnection of distorted solar photo-oltaic !eneration to a#tility !rid, 0hich re1#ires the synchroni2ation 3et0een photo-oltaic -olta!e and !rid-olta!e. +he -olta!e im3alance d#e to harmonic content in photo-oltaic system d#e to po0er electronic de-ices res#lts in o-er c#rrents and #ndesira3le protection trippin!. +he controlstr#ct#re, that incl#des c#rrent control loop and -olta!e control loop and filter desi!n for smooth interconnection 3et0een photo-oltaic system and #tility !rid. Key words- -olta!e control loop, c#rrent control loop, phase locked loop and po0er systemnterconnection. I.INTR! #TIN ncreasin! #tili2ation of electrical ener!y made rene0a3le ener!y as predominant so#rce,synchroni2ation of s#ch rene0a3le ener!y so#rces like solar and 0ind ener!y to the !rid net0ork has se-eral challen!es d#e to harmonic distortion and -olta!e #n3alance 4d#e to intermittentnat#re of its a-aila3ility5 in rene0a3le ener!y !enerations. International Journal of Research Review in Engineering and Management (IJRREM), olume ! , Issue !#, $e%!#& ', age No #!#*  Distri3#ted po0er !eneration #nits are connected to the #tility !rid 6(7$687.n the !ridconnected scheme, the phase and -olta!e ma!nit#de are set 3y the !rid at the point of commonco#plin! 4P5, the distri3#ted po0er !eneration 4DPG5 synchroni2e 0ith the P -olta!e.+he !rid meas#rements s#ch as -olta!e ma!nit#de, fre1#ency and phase an!le 0ill 3e the maino39ecti-e for sta3le synchroni2ation operation. +he practical connection 3et0een #tility !rid andDPG is reali2ed in 6:7$67,for smooth interconnection the DPG -olta!e and !rid -olta!e sho#ld 3e of same, 3#t it is not !#aranteed in distorted photo-oltaic !eneration.n the proposed system, the interconnection and synchroni2ation of !rid net0ork to distortedsolar photo-oltaic !eneration is analy2ed, 0ith the !oal of rectifyin! the harmonic distortion andthe -olta!e mismatch at the point of common co#plin!. +his paper is or!ani2ed as follo0s;Section  re-ie0s the control str#ct#re for interconnection of distorted PV !eneration to !ridnet0ork. Section  presents the sim#lation res#lts of proposed system. <inally, Section V presents the concl#sions. II.#NTR$ STR #T R% &R T'% INT%R#NN%#TIN & GRI!N%T(RK T !ISTRT%! P) G%N%RATIN <i!. ( sho0s the control 3lock dia!ram of proposed system 0ith -olta!e control loop andc#rrent control loop respecti-ely. t consist of inner control loop and o#ter control loop, the inner c#rrent control loop controls the o#tp#t c#rrent of the -olta!e so#rce in-erter 4VS5 and the o#ter -olta!e control loop controls the o#tp#t of filter -olta!e. n the -olta!e control loop, the proportionaland inte!ral 4P5 controller is #sed at solar photo-oltaic !eneration to control -olta!e and c#rrent. +he phase locked loop 4PLL5 is #sed to analy2e the three phase !rid -olta!e respecti-ely. +he proposedsystem eliminates the o-er c#rrent d#e to -olta!e mismatch 3et0een PV !eneration and !rid, thema!nit#de of o-er c#rrent depends #pon the -olta!e difference 3et0een PV and !rid respecti-ely+he fre1#ency and phase an!le of !rid -olta!e is transformed from a3c to d1 1#antities #sin! 4(5and 4/5,=<d1>/?&4fa @ f3e 9*/* ?&@ fce 9*B* ?&5e C9*4(5 > dt  ʃ ɷ 4/5Fhere,  is phase an!le and is fre1#ency of !rid -olta!e respecti-ely. ɷ  &ig. *. ontroller 3lock 0ith -olta!e and c#rrent control loop.  A. Connection of Distorted DPG To Grid Network Through LC Filter  <i!. / sho0s the circ#it dia!ram of three Phase -olta!e so#rce con-erter connected to the !ridnet0ork thro#!h L filter. +he ind#ctance of transmission line and filter are !i-en 3y 4L +L  andL i 5 ,capacitance  0ith a series resistance     and the e1#i-alent resistance is !i-en 3y 4  +L  and   5 respecti-ely, &ig. +. VS connected to !rid net0ork +he transfer f#nction 3et0een harmonic c#rrent and harmonic -olta!e !i-en in 4&5, 3ased on0hich the filter -al#es has 3een desi!ned.i d1h  ? - d1h  > 4s?L5 ? 4s /  @ s.?L @ (?L54&5  +he filterin! circ#it has 3een desi!ned for ' th  order harmonics. III. SI, $ATIN R%S $TS & PRPS%! SST%, +he proposed method has 3een tested 3y sim#lation, the three phase pro!ramma3le ac so#rceis #sed to em#late the !rid -olta!e. +he DPG is represented 3y solar photo-oltaic 4PV5!eneration follo0ed 3y 3oost con-erter, 0hich is #sed to 3oost the solar -olta!e and fed into the-olta!e so#rce in-erter follo0ed 3y filter desi!n and transmission line, the p#lses for the -olta!eso#rce in-erter is !enerated 3y the control str#ct#re, 0hich consist of -olta!e and c#rrent controlloop 3ased on 0hich the VS is tri!!ered. +he o#tp#t of the VS consist of harmonics d#e to the presence of po0er electronic de-ices, 0hich are remo-ed 3y ena3lin! filter and transmissionLine desi!n and the synchroni2ation is achie-ed at the point of common co#plin!.+he o#tp#t 0a-eform of -olta!e so#rce in-erter 0hich consist of harmonics, d#e to 0hich thesynchroni2ation 3ecomes compleH is sho0n in the <i!.&4a5 and <i!.&435 sho0s the 0a-eform atthe P respecti-ely, &ig. /a0
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