International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering

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1 ISSN (Prnt) : Interntonl Journl of dvned Reserh n Eletrl, Eletrons nd Instrumentton Engneerng (n ISO 397: 007 ertfed Orgnzton) Vol. 3, Spel Issue 5, Deemer 04 DSTTOM Implemented On 3 Phse 4 Wre Dstruton System for Hrmon Elmnton nd System lne Neethu Sthyn, Fossy Mry hko M.Teh student, SINTGITS ollege of Engneerng, Kottym, Kerl, Ind ssstnt Professor, SINTGITS ollege of Engneerng, Kottym, Kerl, Ind STRT: Ths pper dels wth the desgn nd smulton of the performne of synhronous referene frme (SRF) nd neurl network ontrolled DSTTOM long wth zgzg trnsformer, mplemented on three phse four wre dstruton system s soluton for power qulty ssues. Frst prt of the pper dels wth the desgn nd smulton of SRF ontrolled DSTTOM sed on threeleg nd fourleg VS topology nd performne of oth s evluted nd ompred. Seond prt dels wth the desgn nd smulton of NeurlNetwork ontrolled DSTTOM sed on three leg VS topology. Then the performne of DSTTOM usng oth SRF nd Neurl Network wll e ompred. For the threeleg voltgesoure onverter (VS) sed DSTTOM onfgurton zgzg trnsformer s used for neutrl urrent ompenston t the P. SRF strtegy genertes unt vetors from the grd voltge nd opertes voltge soure nverter. It uses oordnte trnsformtons to generte the urrent referene. Wheres n NN strtegy the dlnesed urrent deomposer estmtes the referene urrents through trkng of unt vetors together wth tunng of the weghts. The performne of the proposed DSTTOM system s vldted through smultons usng MTL softwre wth ts Smulnk nd Power System lok set tooloxes. KEYWORDS:Dstruton Stt ompenstor (DSTTOM), Synhronous Referene Frme (SRF), rtfl Neurl Network (NN), Power Qulty Improvement, Voltge Soure onverter (VS), ZgZg trnsformer, Pont of ommon ouplng (P) et. I. INTRODUTION Idelly, the gol of power ndustry s to supply purely snusodl voltge t fxed mpltude nd fxed frequeny. Wheres t s the duty of the suppler to provde n lmost snusodl voltge wth less vrton n mpltude nd frequeny, the user lso hs prt to ply n retng suh senro. Power qulty prolems n the dstruton systems re mnly due to the prolferton of dfferent types of nonlner lods, unplnned expnson of the dstruton system, et. These power qulty prolems nlude hgh retve power urden, hrmon urrents, lod unlne, nd exessve neutrl urrent. The power qulty t the pont of ommon ouplng (P) s regulted y the vrous stndrds suh s IEEE59 stndrd. threephse fourwre dstruton stt ompenstor (DSTTOM) s used for neutrl urrent ompenston long wth voltge regulton or power ftor orreton, hrmon elmnton, nd lod lnng n threephse fourwre system wth lner nd nonlner lods. There re mny strteges vlle for the generton of referene soure urrents for the ontrol of VS of DSTTOM for threephse fourwre system. In ths pper, ontrol pproh sed on Synhronous Referene Frme (SRF) strtegy& rtfl Neurl Network(NN) s used under nonsnusodl supply ondtons for the three opyrght to IJREEIE 38

2 ISSN (Prnt) : Interntonl Journl of dvned Reserh n Eletrl, Eletrons nd Instrumentton Engneerng (n ISO 397: 007 ertfed Orgnzton) Vol. 3, Spel Issue 5, Deemer 04 leg & fourleg VS sed DSTTOM mplemented on threephse fourwre system. The estmted referene supply urrent s used for genertng the gte pulses for the VS of the DSTTOM II. METHODOLOGY. SRF ontrol The synhronous referene frme strtegy uses oordnte trnsformtons to generte the urrent referene. It employs the wellknown lrke s Trnsformton nd Prk s Trnsformton for ths purpose..referene Sgnl Estmton. The referene supply urrent s estmted usng the sensed lod urrent nd voltge t P. The SRF method s lso known s I d I q method. Eh urrent omponent hs n verge vlue or d omponent nd n oslltng vlue or omponent s The referene soure urrent s therefore s = () = () = (3) = (4) where, loss s the loss urrent omponent nd qr retve power omponent. The referene soure urrent n the frme s otned y reverse trnsformton of the ove urrent vetor:. urrentontrolled PWM for genertng gtng pulses 0 0 = 0 os θ sn θ 0 sn θ os θ 0 (5) In urrent ontroller, the sensed nd referene supply urrents re ompred wth trngulr rrer sgnl to generte the gtng sgnls for sx swthes.. NN ontrol The s theory of deomposer s sed on the lest men squre (LMS) lgorthm, nd ts trnng s through DLINE for genertng the referene soure urrents. For n system, the soure voltges nd lod urrents hve hrmon omponents long wth fundmentl omponents V = V sn ωt V sn(nωt θ ) (6) I = I sn ωt I sn(nωt θ ) (7) Where V ndv n re the peks of the fundmentl nd hrmon omponents of the voltge. Smlrly, I nd I n re the peks of the fundmentl nd hrmon omponents of the urrent. The unt templte for three phses n e represented s opyrght to IJREEIE 383

3 ISSN (Prnt) : Interntonl Journl of dvned Reserh n Eletrl, Eletrons nd Instrumentton Engneerng (n ISO 397: 007 ertfed Orgnzton) Vol. 3, Spel Issue 5, Deemer 04 u = U sn ωt u = U sn(ωt 0) u = U sn(ωt 40) (8) x = U os ωt x = U os(ωt 0) x = U os(ωt 40) (9) WhereU =. The fundmentl lod urrent n e deomposed s I = I I (0) WhereI p ndi q re the tve nd retve power omponents of the lod urrent, respetvely. The estmtes of the fundmentl tve power nd fundmentl retve power omponents of the lod urrent for sngle phse re otned y estmtng the respetve weghts orrespondng to the fundmentl tve omponents of the lod urrent (w p, w p, w p ) nd the weghts orrespondng to the fundmentl retve omponents of the lod urrent (w q, w q, w q ). The weghts re updted usng the LMS lgorthm. W ( ) = W ( ) η ( ) W ( ) u ( ) u ( ) W ( ) = W ( ) η ( ) W ( ) u ( ) u ( ) W ( ) = W ( ) η ( ) W ( ) u ( ) u ( ) W ( ) = W ( ) η ( ) W ( ) x ( ) x ( ) () W ( ) = W ( ) η ( ) W ( ) x ( ) x ( ) W ( ) = W ( ) η ( ) W ( ) x ( ) x ( ) Whereη s the oeffent of onvergene nd ts vlue les etween 0 nd. It s used s 0. n ths LMS lgorthm. The verge weght orrespondng to the tve nd retve omponents of the lod s shown s W = (W W W )/3 () W = (W W W )/3 (3) Two Proportonl Integrl (PI) ontrollers re used for ontrollng the d us voltge nd termnl voltge. Ths PI ontroller estmtes the loss omponent of the soure urrent (W loss ), nd hene, ths s dded wth the W p. The seond PI ontroller s used over the mpltude of P voltge nd referene vlues, nd t estmtes the retve omponent of the DSTTOM urrent (W qr ), nd hene, ths s dded wth the W q. Now, the rel nd retve omponents of the referene soure urrents re omputed s = W u = W u = W u (4) = W x = W x = W x (5) The referene soure urrents re otned s the sum of tve nd retve power urrents s = = = (6) opyrght to IJREEIE 384

4 ISSN (Prnt) : Interntonl Journl of dvned Reserh n Eletrl, Eletrons nd Instrumentton Engneerng (n ISO 397: 007 ertfed Orgnzton) Vol. 3, Spel Issue 5, Deemer 04 The referene soure urrents n three phses re used for the ontrol of the threeleg VS. The sensed nd referene soure urrents re ompred, nd the error s used to generte the gtng sgnls for the IGT swthes III. MODELLING The fourleg VS sed DSTTOM nd threeleg VS nd the zgzg trnsformersed DSTTOM for threephse fourwre system re modelled usng SRF nd NN ontrol strteges nd smulted usng MTL nd ts Smulnk nd Sm Power System (SPS) tooloxes The multwndng trnsformer model vlle n the SPS s used for modellng the zgzg trnsformer. The rpple flter s onneted to the VS of the DSTTOM for flterng the rpple n the P voltge. The system dt re gven n the ppendx. The ontrol lgorthm for the DSTTOM s lso modelled n MTL. The referene soure urrents re derved from the sensed P voltges (V S, V S, V S ), lod urrents ( L, L, L ), nd the d us voltge of DSTTOM (V d ). Followng fgures shows the Smulnk model of the DSTTOM sed on the dfferent ontrol strteges nd the prevous mentoned onfgurtons. pulsewdth modulted (PWM) urrent ontroller s used over the referene nd sensed soure urrents to generte the gtng sgnls for the IGTs of the VS of the DSTTOM. The swthng frequeny s set s 0 khz.. Three phse four wre system wthout DSTTOM Ds rete, Ts = e 006 s. Vsoure Vlod N p owe rgu ThreePhse Progrmm le Voltge Soure ThreePhse Seres RL rnh V I Goto Goto V I Goto Ilod ThreePhse Goto3reker Seres RL Lod L Lod urrent Mesurement Sope3 Seres RL Lod onn ThreePhse reker onn From Sope Vsoure From4 onn3 Susystem Vlod Vlod From Sope From5 Ilod From6 Sope From7 Sope4 Ilod From3 Fg.Three phse fourwre system wthout DSTTOM opyrght to IJREEIE 385

5 ISSN (Prnt) : Interntonl Journl of dvned Reserh n Eletrl, Eletrons nd Instrumentton Engneerng (n ISO 397: 007 ertfed Orgnzton) Vol. 3, Spel Issue 5, Deemer 04. Three phse four wre system wth 4leg VS sed SRF ontrolled DSTTOM Dsrete, Ts = e 006 s. po we rgu VS g g Vsoure Goto Vlod Goto N ThreePhse Progrm mle Voltge Soure T hreephse Seres RL rnh Goto Ilod Goto3 ThreePhse reker Seres RL Lod Seres RL Lod In Goto6 T hreephse Seres RL rnh Seres RL Lod urrent Mesurement urrent Mesurement Sope0 ThreePhse reker Sope3Goto4 Ion Seres RL rnh ThreePhse reker Sope7 Sope V I onn onn onn3 From Vsou re From Vd In In Out T hreephse Seres RL rnh urrent Mesurement Sope 8 Susystem From Vlod In3 In4 Out VS Ilod From 0 Sope6 From 3 Susystem V I V I Vlod Vsoure From8 Sope4 Seres RL rnh From 4 Vlod From 5 From 7 Sope Voltge Mesurement v Vd Goto5 From 6 Sope Ilod From Fg. System wth 4leg VS sed SRF ontrolled DSTTOM In Dsrete 3phse PLL Freq Term ntor sn_os dq0 _to_dq0 Trnsformton Termntor3 Fo=7Hz D srete Fl ter 0 onstnt dq0 sn_os From4 dq0_to_ Trnsformton Isour e Gte Iref Gte Susystem Out Out In V(pu) wt Sn_os Term ntor 680 PI 0 Gn 3 In3 onstnt Fo=50Hz Flter 340 onstnt D srete PI ontroller PI Fo=0Hz Dsrete Fl ter 4 In4 In Out Fo=50Hz Dsrete PI ontroller Susystem Flter Fg. 3 ontrol rut for 4leg VS sed SRF ontrolled DSTTOM opyrght to IJREEIE 386

6 g ISSN (Prnt) : Interntonl Journl of dvned Reserh n Eletrl, Eletrons nd Instrumentton Engneerng (n ISO 397: 007 ertfed Orgnzton) Vol. 3, Spel Issue 5, Deemer 04 The threephse fourwre DSTTOM s used for retve power nd hrmon urrent ompenston long wth lod lnng nd neutrl urrent ompenston. There s 3 phse wre nd one neutrl wre. The frst three legs wll provde ompenstng urrents for the three phses, whle the fourth leg provdes the ompenstng urrent for neutrl.. Three phse four wre system wth 3leg VS sed SRF ontrolled DSTTOM Dsrete, Ts = e 00 6 s. po wergu Vsoure Sope6 N ThreePhse Progrmmle Voltge Soure ThreePhse Seres RL rnh V I Goto Goto V I Vlod Goto Ilod Goto3 urrent Mesurement In Goto6 ThreePhse Seres RL rnh Sope0 ThreePhse urrent reker Mesurement Sope3 ThreePhse reker Goto4 Ion Seres RL rnh Sope8 Seres RL Lod Seres RL Lod Seres RL Lod From Vsoure In In Sope T hreephse Seres RL rnh V I N urrent Mesurement Groundng Trnsformer ThreePhse reker onn onn From Vd In3 Out onn3 onn4 From In4 Susystem Vlod Susystem VS Vlod From3 Vsoure From8 Sope4 Seres RL rnh From4 Vlod From5 From7 Sope Ilod Voltge Mesurement v Vd From6 Ilod From0 Sope5 Goto5 From9 Sope Fg 4. System wth 3leg VS sed SRF ontrolled DSTTOM In Dsrete 3phse PLL Freq T ermntor dq0 sn_o s _to_dq0 Trnsformton T ermntor3 Fo=7Hz Dsrete Flter 0 onstnt dq0 sn_os From4 dq0_to_ Trnsformton Gte Iref Susystem Out In V(pu) wt Sn_os T ermntor 680 PI 0 Gn 3 In3 onstnt Fo=50Hz Dsrete Flter3 340 onstnt D srete PI ontroller PI Fo=0Hz Dsrete Flter 4 In4 In Out Susystem Fo=50Hz Dsrete Flter4 Dsrete PI ontroller Fg 5 ontrol rut for 3leg VS sed SRF ontrolled DSTTOM opyrght to IJREEIE 387

7 v g ISSN (Prnt) : Interntonl Journl of dvned Reserh n Eletrl, Eletrons nd Instrumentton Engneerng (n ISO 397: 007 ertfed Orgnzton) Vol. 3, Spel Issue 5, Deemer 04 In threeleg VS sed DSTTOM there s no fourth leg to provde ompenston for neutrl urrent. Hene zgzg trnsformer s norported to provde neutrl urrent ompenston. D. Three phse four wre system wth 3leg VS sed NNontrolled DSTTOM Ds rete, Ts = e 006 s. po we rg u Vsoure N T hreephse Progrmmle Voltge Soure V I Goto Goto V I Vlod Goto3 Ilod Goto4 Sope6 3 ThreePhse reker Seres RL rnh Sope5 V I N Sope7 Seres RL Lod Seres RL Lod Ilod From4 Vd In Sope S Ser Seres RL rnh3 Groundng Trnsformer Vsoure Seres RL Lod onn onn From In3 Out From5 onn3 onn4 ThreePhse reker Vlod Susystem Vlod From3 In4 VS From6 Susystem3 From7 Ilod From0 Vlod Ilod Voltge Mesurement Sope From8 Sope4 From9 Sope3 Goto5 Vd From Sope Fg 6. System wth NN ontrolled DSTTOM Wp From7 Goto8 Wp From5 Wloss In U Unt Dely z U U X X X Susystem3 f(u) Wp f(u) /3 Gn Wp f(u) Wp f(u) Wq f(u) Wq /3 Gn f(u) Wq Goto9 Wq 680 onstnt Fo=50Hz PI Dsrete PI ontroller Wloss Goto6 Wp From9 z Unt Dely From8 Wq In3 Dsrete Flter Sope u()*u() p* Wqr From6 u()*u() 45*.44/.73 onstnt PI Wqr Goto7 Dsrete PI ontroller Ip* u()*u() From5 Gte Ip* Iref Out Wq u()*u() Iq* Susystem From4 3 InOut Fo=6Hz u()*u() In4 Susystem Dsrete Flter Iq* u()*u() Step 0 Swth Iq* onstnt3 Fg 7. NN ontrol system opyrght to IJREEIE 388

8 ISSN (Prnt) : Interntonl Journl of dvned Reserh n Eletrl, Eletrons nd Instrumentton Engneerng (n ISO 397: 007 ertfed Orgnzton) Vol. 3, Spel Issue 5, Deemer 04 IV. SIMULTION RESULTS The performne of DSTTOM for P voltge regulton, hrmon elmnton, neutrl urrent ompenston nd lod lnng, s shown n followng grphs. The performne of the threephse VSsed DSTTOM for P voltge regulton, long wth neutrl urrent ompenston nd lod lnng of threephse fourwre lner lod, s shown n ove Fgures. It s oserved tht the mpltude of P voltge (V S ) s regulted to the referene mpltude y the requred retve power ompenston nd tht the soure neutrl urrent ( sn ) s mntned t nerly zero euse of the zgzg trnsformer. The d us voltge of the ptor (V d ) of the VS of DSTTOM s regulted y the ontroller, nd the d voltge s mntned ner the referene d voltge under vryng lod dsturnes. The totl hrmon dstorton (THD) of soure urrent s oserved to e less thn 5%, whh meets the requrement of IEEE59 stndrd.. System wthout DSTTOM Fg 8. Smulton output of ThreePhse four wre system wth lner lod nd wthout DSTTOM Fg 9. Smulton result of three phse fourwre system wth nonlner lod nd wthout DSTTOM The result shows tht for lner lod the soure urrent nd lod (p) voltge s purely snusodl nd for nonlner lod the soure urrent nd lod (p) voltge s very muh dstorted. FFT nlyss shows tht the THD ontent n p voltge, soure urrent nd lod urrent s very hgh out 5.05%, 7.39% nd 7.39%. opyrght to IJREEIE 389

9 ISSN (Prnt) : Interntonl Journl of dvned Reserh n Eletrl, Eletrons nd Instrumentton Engneerng. SRF ontrol strtegy. FOURLEG VS sed DSTTOM (n ISO 397: 007 ertfed Orgnzton) Vol. 3, Spel Issue 5, Deemer 04 It hs etter performne thn onventonl flters. ut the hgher power rtng of nverters nrese the ost of system. lso t n e ppled only for 3 phse 4 wre systems. The termnl voltge s mntned to the referene voltge y djustng the retve power njeton.. FFT nlyss shows tht the THD ontent n p voltge nd lod urrent s very hgh out 4.37% nd 5.53%, ut soure urrent s redued to 3.%. Fg 0. Smulton output of ThreePhse four wre system wth DSTTOM (4leg VS) nd NonLner lod. THREELEG VS sed DSTTOM Fg. Smulton output of ThreePhse four wre system wth DSTTOM (3leg VS nd zgzg trnsformer) nd NonLner lod It hs etter performne thn 4 leg VS sed DSTTOM. It n e desgned for oth 3 phse 3 wre nd 4 wre systems. It s ost effetve too. The supply neutrl urrent s nerly zero nd t verfes the properompenston y the zgzg trnsformer. Power rtng of onverter n e redued. The termnl voltge smntned to the referene voltge y djustng the retve power njeton.. FFT nlyss shows tht thethd ontent n p voltge nd lod urrent s very hgh out 4.8% nd 6.8%, ut soure urrent s redued to.4%. opyrght to IJREEIE 390

10 ISSN (Prnt) : Interntonl Journl of dvned Reserh n Eletrl, Eletrons nd Instrumentton Engneerng. NN ontrol strtegy (n ISO 397: 007 ertfed Orgnzton) Vol. 3, Spel Issue 5, Deemer 04 Fg. Smulton output of ThreePhse four wre system wth NN ontrolled DSTTOM (3leg VS nd zgzg trnsformer) nd NonLner lod Neurl Network strtegy hs etter performne thn SRF ontrol strtegy nd t s ost effetve too. Thesupply neutrl urrent s nerly zero nd t verfes the proper ompenston y the zgzg trnsformer. Thetermnl voltge s mntned to the referene voltge y djustng the retve power njeton. It s lsooserved tht the d us voltge of DSTTOM s mntned t the referene vlue under ll dsturnes. FFT nlyss shows tht the THD ontent n p voltge nd soure urrent s very hgh out 6.37% nd.%,ut soure urrent s redued to 0.6%. D. THD nlyss of system wth nonlner lod TLEI P VOLTGE SOURE URRENT LOD URRENT Wthout DSTTOM 5.05% 7.39% 7.39% Wth SRF ontrolled 4legVS DSTTOM Wth SRF ontrolled 3legVS DSTTOM& ZgZg trnsformer Wth NN ontrolled 3leg VSDSTTOM 4.37% 3.% 5.53% 4.8%.4% 6.8% 6.37% 0.6%.8% It s oserved tht y the use of SRF nd NN ontrol tehnques though the lod urrent nd P voltge hrmons remn unompensted, the hrmon ontent n the soure urrent s redued nd ttned IEEE stndrd. y omprng the THD ontent, t s ovous tht 3leg VS sed NN ontrolled DSTTOM gves etter hrmons mtgton thn 3leg nd 4leg VS sed SRF ontrolled DSTTOM. opyrght to IJREEIE 39

11 ISSN (Prnt) : Interntonl Journl of dvned Reserh n Eletrl, Eletrons nd Instrumentton Engneerng E. System wth lner unlned lod (n ISO 397: 007 ertfed Orgnzton) Vol. 3, Spel Issue 5, Deemer 04 Fg 3. Unompensted system Fg7. 3leg VS sed DSTTOM wth SRF ontrol Fg4. Neutrl urrent of unompensted system Fg 8. Neutrl urrent of SRF ontrolled 3leg VS sed DSTTOM system Fg5.4leg VS sed DSTTOM wth SRF ontrol Fg 9. NN ontrolled DSTTOM Fg 6. Neutrl urrent of SRF ontrolled 4leg VS sed DSTTOM system Fg 0. Neutrl urrent of NN ontrolled DSTTOM The 3leg VS sed DSTTOM system wth zgzg trnsformer hs een found to e effetve for ompenstng the zerosequene fundmentl nd hrmon neutrl urrents thn 4leg VS sed DSTTOM system. y omprng opyrght to IJREEIE 39

12 ISSN (Prnt) : Interntonl Journl of dvned Reserh n Eletrl, Eletrons nd Instrumentton Engneerng (n ISO 397: 007 ertfed Orgnzton) Vol. 3, Spel Issue 5, Deemer 04 the neutrl urrent, t s ovous tht 3leg VS sed NN ontrolled DSTTOM gves etter lod lnng nd neutrl urrent ompenston thn 3leg nd 4leg VS sed SRF ontrolled DSTTOM. The unompensted neutrl urrent s of out 0. nd ts lmted to vlue less thn 0. for SRF ontrolled DSTTOM nd t s further redued to vlue less thn 0.05 for NN ontrolled DSTTOM. V. ONLUSION The nlyss & smulton of threephse fourwre DSTTOM ontrolled wth SRF nd NN ts performne hs een demonstrted for neutrl urrent elmnton long wth retve power ompenston, hrmon elmnton, nd lod lnng. It s oserved tht the mpltude of P voltge s regulted to the referene mpltude y the requred retve power ompenston nd tht the soure neutrl urrent s mntned t nerly zero euse of the zgzg trnsformer. The d us voltge of the ptor of the VS of DSTTOM s regulted y the ontroller, nd the d voltge s mntned ner the referene d voltge. The totl hrmon dstorton (THD) of soure urrent s oserved to e less thn 5%, whh meets the requrement of IEEE59 stndrd. ut on omprng etween SRF nd NN t hs een found tht the NN ontrol tehnque s smple to mplement & fst n response. lso, NN redues wveform dstorton nd THD of the P voltge nd soure urrent muh etter thn SRF. It lso redues the ntl phse shftng nd wveform settlng tme. Lne mpedne: R s = 0.0 X, L s = mh Lod, Lner: 000 kv, pf lg Nonlner: Threephse rdge retfer nd seres R L lod wth R = 50 X nd L = mh Rpple flter :Rf = 5 X, f = 5 lf D us ptne :3000lF D us voltge: 680 V lne voltge: 45 V, 50 Hz PWM swthng frequeny :0 khz PPENDIX REFERENES [] hm Sngh, P. Jyprksh nd D.P. Kothr, New ontrol pproh for ptor supported DSTTOMn threephse four wre dstruton system under nondel supply voltge ondtons sed on synhronousreferene frme theory, Int J Eletrl Power nd Energy Systems; 0 33: 097. [] hm Sngh, P. Jyprksh, Sunl Kumr, nd D. P. Kothr, Implementton of NeurlNetworkontrolledThreeLeg VS nd Trnsformer s ThreePhse FourWre DSTTOM, IEEE Trns. Industry pp. Vol. 47,No. 4, July/ugust 0. [3] S.K.Ds nd J.K.Mohrn, Desgn nd Smulton of Smll Sgnl Model of STTOM for RetvePower ompenston on Vrton of D lnk Voltge, IJEIT, vol., ssue 5, Nov. 0. [4].nnd Kumr nd G.GnneshwrKumr, Power ompenston t Dstruton Level usng VSsed DSTTOM, Int. Jour. Engneerng Reserh nd Tehnology (IJERT), Vol. Issue 5, July 0. [5] J. M. I. Mlns, E. R. dvl, nd F.. Gonzlez, omprson of ontrol strteges for shunt tve powerflters n threephse fourwre systems, IEEE Trns. Power Eletron., vol., no., pp. 936, Jn [6] H.L. Jou, K.D. Wu, J.. Wu, nd W.J. hng, threephse fourwre power flter omprsng threephsethreewre tve flter nd zgzg trnsformer, IEEE Trns. Power Eletron., vol. 3, no., pp. 559,Jn [7] H.L. Jou, J.. Wu, K.D. Wu, W.J. hng, nd Y.H. hen, nlyss of zgzg trnsformer pplyng nthe threephse fourwre dstruton power system, IEEE Trns. Power Del., vol. 0, no., pp. 6873, pr.005 [8] Prmod Kumr Meher nd Sng Yoon Prk, rtlpth nlyss nd Lowomplexty mplementtonof the LMS dptve lgorthm, IEEE Trns. ruts nd Systems: Regulr Ppers. [9]. Sngh, V. Verm, nd J. Solnk, Neurl networksed seletve ompenston urrent qulty prolemsn dstruton system, IEEE Trns. Ind. Eletron., vol. 54, no., pp. 5360, Fe [0] Prmod Kumr Meher nd Sng Yoon Prk, rtlpth nlyss nd Low omplexty mplementtonof the LMS dptve lgorthm, IEEE Trns. ruts nd Systems: Regulr Ppers opyrght to IJREEIE 393

13 ISSN (Prnt) : Interntonl Journl of dvned Reserh n Eletrl, Eletrons nd Instrumentton Engneerng (n ISO 397: 007 ertfed Orgnzton) Vol. 3, Spel Issue 5, Deemer 04 [] V. Sores, P. Verdelho, nd P. D. Mrques, tve power flter ontrol rut sed on nstntneoustve nd retve urrent d q method, n Pro. IEEE PES, 997, pp []S. Km nd P. N. Enjet, ontrol strteges for tve power flter n threephse fourwre systems, npro. IEEE PE, Fe. 000, pp [3] R.. Dugn, M. F. MGrnghn, nd H. W. ety, Eletr Power Systems Qulty, nd ed. New York:MGrwHll, 006. [4] K. R. Pdyr, FTS ontrollers n Trnsmsson nd Dstruton. New Delh, Ind: New ge Int., 007. [5] IEEE Reommended Prtes nd Requrements for Hrmons ontrol n Eletr Power Systems, IEEEStd. 59, 99. IOGRPHY Neethu Sthyn Reeved.Teh n Eletrl & Eletrons Engneerng from MG Unversty,Kottym, Ind n 0. She s urrently dong M.Teh degree n Power systems from Sntgts ollege of Engneerng, Kottym, Ind. Fossy Mry hko Reeved.Teh n Eletrl & Eletrons Engneerng from Unversty of Knnur, Ind. She Reeved M.Teh degree n Industrl Drves nd ontrol from RIT, Pmpdy, Ind. She hs een workng n the EEE deprtment of SINTGITS ollege of Engneerng s ssstnt Professor for 9 yers. opyrght to IJREEIE 394