DAMPING OF OSCILLATIONS IN MULTI-MACHINE INTEGRATED POWER SYSTEMS USING HYBRID FUZZY STRATEGIES

Transcription

1 Interntionl Journl of Reserh nd Reviews in pplied Sienes Volue, Issue (Noveer 009) DMPING OF OSILLTIONS IN MULTI-MHINE INTEGRTED POWER SYSTEMS USING HYRID FUZZY STRTEGIES DKK OULESU, DR. S. F. KODD, DR. V. SNKR RM 3 Reserh Sholr, EEE Dept., JNTU, Hyderd-85, ndhr Prdesh, Indi, ssoite Professor, MITS, Mdnplli, hittor Dist, P, Indi. Professor & HOD, Dept. of EEE, uror Engg ollege, hongir Professor, Dept. of EEE, JNTUE, Kuktplly, Hydrd-85. STRT The design & developent of fuy logi ontroller using UPFs to dp out the osilltions in FTS sed integrted ulti-hine power syste when fults tkes ple t different uses (one fult t tie) is presented in this pper. The ulti-hine syste onsists of 3 genertors, 3 trnsforers, 9 uses, 4 lods & UPFs. 3 Siulink odels re developed with & without the hyrid ontroller y onsidering the ourrene of one fult t tie ner eh genertor. The 3 phse to ground syetril fult is de to our ner the first genertor for 00 s in the odel, next t the seond genertor in odel & finlly t the third genertor in odel 3. Siultions re perfored with & without the ontroller. The 3 odels re opred for the effetiveness of the fult ourrene ner eh of the genertors. The digitl siultion results show the effetiveness of the ethod presented in this pper. Keywords : UPF, POD, Fuy logi, oordintion, ontroller, Osilltions, Dping, Stility, Siulink, Stte spe odel. I. INTRODUTION ording to IEEE, FTS - whih is the revition of Flexile Trnsission Systes, is defined s lternting urrent trnsission systes inorporting power eletronis sed nd other stti ontrollers to enhne ontrollility nd power trnsfer pility. Dyni retive power openstion nd dping power syste osilltions n lso e hieved using FTS ontrollers. Injeting the series voltge phsor, with desirle voltge gnitude nd phse ngle in line n provide powerful ens of preisely ontrolling the tive nd retive power flows, y whih syste stility n e iproved, syste reliility n e enhned while operting nd trnsission investent ost n e redued. It is possile to vry the ipedne of speifi trnsission line to fore power flow long desired ontrt pth in the eerging power systes, nd to regulte the unwnted loop power flows nd prllel power flows in the interonneted syste. The FTS ontrollers hve een rodly developed on two different priniples, one tht lters the line series retne or us shunt retne or voltge phse differene ross line nd utilies onventionl thyristor swithes for ontrol. In generl, FTS ontrollers n e divided into four tegories sed on their onnetion in the network, vi., series, shunt, oined series-series, nd oined series-shunt. In our work, we hve used the series-shunt ointion []. The orgnition of the pper is s follows. Firstly, rief introdution to the FTS, its evolutions, pplitions, the UPF ontroller & the fuy logi ontroller ws presented in the previous prgrphs. Setion presents the thetil odeling of the ulti-hine syste long with the preters. In setion 3, the ontrol strtegy, the design of the ontroller for ll the 3 odels is presented. Setion 4 presents the developent of the 3 Siulink odels for the dping of the power syste osilltions when fult tkes ple ner eh genertor, individully t tie. Siultion results re presented in setion 5. 96

2 Interntionl Journl of Reserh nd Reviews in pplied Sienes Volue, Issue (Noveer 009) onlusions re finlly presented t the end in setion 6. This is followed y the ronys & the referenes. II. MODELING OF THE 3-MHINE, 9-US INTEGRTED POWER SYSTEM The integrted ulti-hine power syste odel onsisting of 3 genertors used for the siultion purposes is shown in the for of one-line digr (single line digr) with & without the ontrollers in the Fig. respetively. The genertors, nd 3 re onneted to uses, 5 nd 8. Two UPF s re used for ontrolling & dping the power syste osilltions in the integrted plnt []. One is onneted etween us & 3 nd the other is onneted etween uses 6 nd 7. Three trnsforers T to T3 re lso used in the integrted power syste ner the genertor uses for the power trnsission purposes, i.e., for stepping up & stepping down purposes. Trnsission lines re onneted etween the uses Sine, we know tht the power syste is dyni one, definitely, it is non-liner syste [0]. For odeling & siultion purposes in the Mtl-Siulink environent, nueril odel is needed. y lineriing out n operting point, the totl lineried power syste odel (the plnt odel) is represented finlly in the stte spe for s x& = x + u, () y = x + D u. Gen Gen us Trnsforer Lod us 8 Trnsforer us UPF Fuy Logi ontroller POD UPF Fuy Logi ontroller us 3 us 7 POD us 6 us 9 us 4 Lod 3 Trnsforer 3 us 5 Gen 3 Lod 3 Lod Fig. : 3-hine, 9-us interonneted power syste odel with 4-lods & POD-UPF & the fuy ontroller III. DEVELOPMENT OF THE ONTROL STRTEGY ontroller is devie whih ontrols eh & every opertion in the syste king deisions. Fro the ontrol syste point of view, it is ringing stility to the syste when there is disturne or noise or fult, thus sfegurding the equipent fro further dges. It y e hrdwre sed ontroller or softwre sed ontroller or ointion of oth. In this setion, the developent of the ontrol strtegy for dping the osilltions in FTS sed power systes is presented. The unified power flow ontroller (UPF) is one of the ost proising devie & ost verstile ontroller devie used in the FTS fily [] - [4]. It is n eletril devie for providing fst-ting retive power openstion on high-voltge trnsission networks & is generlly used s ontroller in loop with the plnt. It hs the pility to ontrol voltge gnitude, line ipedne nd phse ngle, nd n lso independently provide (positive or negtive) retive power injetions, thus providing the voltge support, ontrol of power flow, & n e used to ontrol tive nd retive power flows in trnsission line. [5]. The onept of UPF kes it possile to hndle prtilly ll power flow ontrol nd trnsission line 97

3 Interntionl Journl of Reserh nd Reviews in pplied Sienes Volue, Issue (Noveer 009) openstion proles, using solid stte ontrollers, whih provide funtionl flexiility, generlly not ttinle y onventionl thyristor ontrolled systes [3]. It hs pility of iproving oth stedystte nd dyni perfornes of power syste s they llow ore urte ontrol of the power flow, etter nd fster ontrol of voltge nd syste stility. [6]. It n e onneted in series with trnsission line inside syste or in tie-line onneting su-systes in lrge interonneted power syste [7]. Moreover, UPF further iproves the dyni perforne of the power syste in oordintion with dping ontrollers [8]. s result, one of their pplitions is the dping of power syste osilltions using Power Osilltion Dping (POD), whih reently hs een ttrting the interest of ny reserhers, inluding ours. The hert of the UPF is the power eletroni devies, i.e., the silion ontrolled retifiers. It onsists of two solid-stte synhronous voltge soure onverters oupled through oon D link pitor s shown in Fig. 3, i.e., voltge soure inverters shring oon D storge pitor. Two oupling trnsforers re used. s shown in Fig. 3, the UPF onsists of oosting trnsforer nd n exittion trnsforer linked y k-to-k onverters nd. The first onverter is onneted in shunt nd the seond one in series with the line. The shunt onverter is pririly used to provide tive power dend of the series onverter through oon D link [4]. onverter n lso generte or sor retive power nd therey provide independent shunt retive openstion for the line. onverter provides the in funtion of the UPF y injeting dditionl voltge with ontrollle gnitude nd phse ngle in series with the trnsission line through series trnsforer [5]. The in tsk of the UPF is to ontrol the flow of power in stedy-stte onditions. In ddition, high speed of opertion of thyristor devies kes it possile to ontrol rel nd retive power flow. The UPF n e eployed to enhne power syste dping y odulting the onverter voltges. The UPFs re used t ertin lotions in integrted power syste in etween soe uses [6]. In the Fig. 3 shown, the i nd j represents the uses in the integrted power syste odel. In our work onsidered, we hve tken the totl nuer of uses to e 9 & Two UPFs onneted etween us, 3 nd 6, 7. i Series Trnsforer j Shunt side onverter Series side Shunt Trnsforer D Link pitor onverter Fig. 3 : lok digr of the UPF shee used in FTS (single line digr) Fuy oordintion ontroller Rule se Refer ene Fuifition Unit Deision Mking Unit De-fuifition Unit POD UPF Power Syste (Plnt) tul output (Power ngle) Dt se Fig. 5 : digrti view of typill fuy logi ontroller used long with POD-UPF for ontrolling the osilltions in power syste 98

4 Interntionl Journl of Reserh nd Reviews in pplied Sienes Volue, Issue (Noveer 009) In the reserh work onsidered in this pper, fuy logi ontroller is used to oordinte etween the vrious preters of the ulti-hine sed FTS power syste long with the POD-UPF s shown in the lok digr in the Fig. 5. These fuy ontrollers hve got lot of dvntges opred to the lssil (P, PI, PID) & the onventionl ontrollers (POD-UPF), suh s the sipliity of ontrol, low ost, high reliility, optness of the hrdwre (sine fuy logi ontroller just kes use of fuy rules) nd the possiility to design without knowing the ext thetil odel of the proess []. Fuy logi is one of the suessful pplitions of fuy set in whih the vriles re linguisti rther thn the nueri vriles & eerged s onsequene of the 965 proposl of fuy set theory y Lotfi Zdeh. Linguisti vriles, defined s vriles whose vlues re sentenes in nturl lnguge (suh s lrge or sll), y e represented y the fuy sets. Fuy set is n extension of risp set where n eleent n only elong to set (full eership) or not elong t ll (no eership). Fuy sets llow prtil eership, whih ens tht n eleent y prtilly elong to ore thn one set. fuy set of universe of disourse X is represented y olletion of ordered pirs of generi eleent x X nd its eership funtion µ : X [ 0 ], whih ssoites nuer µ (x) : X [ 0 ], to eh eleent x of X. fuy logi ontroller is sed on set of ontrol rules lled s the fuy rules ong the linguisti vriles [7]. These rules re expressed in the for of onditionl stteents. Our si struture of the fuy logi oordintion ontroller to dp out the osilltions in the power syste onsists of 3 iportnt prts, vi., fuifition, knowledge se - deision king logi (inferene syste) nd the defuifition, whih re explined in rief s follows [3]. The internl struture of the fuy oordintion unit is shown in the Fig. 5. The neessry inputs to the deision-king unit loks re the rule-sed units nd the dt sed lok units. The fuifition unit onverts the risp dt into linguisti vriles. The deision king unit deides in the linguisti vriles with the help of logil linguisti rules supplied y the rule se unit nd the relevnt dt supplied y the dt se [8, 5]. The output of the deision-king unit is given s input to the de-fuifition unit nd the linguisti vriles of the signl re onverted k into the nueri for of dt in the risp for [5]. The deision-king unit uses the onditionl rules of IF-THEN-ELSE, whih n e oserved fro the lgorith entioned elow [4]. The developed fuy rules inluded in the fuy oordinted ontroller is given elow in the for of n lgorith s follows :. If (input_ is f) nd (input_ is f) then (output_ is f3) (). If (input_ is f) nd (input_ is f) then (output_ is f) () 3. If (input_ is f) nd (input_ is f3) then (output_ is s) () 4. If (input_ is f) nd (input_ is f) then (output_ is f3) () 5. If (input_ is f) nd (input_ is f) then (output_ is f) () 6. If (input_ is f) nd (input_ is f3) then (output_ is s) () 7. If (input_ is f3) nd (input_ is f) then (output_ is f3) () 8. If (input_ is f3) nd (input_ is f) then (output_ is f) () 9. If (input_ is f3) nd (input_ is f3) then (output_ is s) () The ontrol deisions re de sed on the fuified vriles. The inferene involves set of rules for deterining the output deisions [8]. s there re input vriles P UPF- nd P UPF- & three fuified vriles (S, M, ), the fuy logi oordintion ontroller hs set of 9 rules for eh POD sed UPF ontroller. To deterine the degree of eerships for the output vriles, the onept of in-x inferene is used. Note tht oth the ontrollers use the se rule se syste [9]. The rule se for the deision-king unit for the POD sed UPF ontroller- is written s shown in the tle II s follows : P UPF P UPF Sll set S f 99 Mediu set M f ig Set f 3 Sll set S f M S Mediu set M f M S

5 Interntionl Journl of Reserh nd Reviews in pplied Sienes Volue, Issue (Noveer 009) ig set f 3 M S S Tle II : The 9-fuy rules used for deterining the output deisions (Inferene tle) rule se used for the ontrol purposes Now, the 9 output vriles of the inferene syste re the linguisti vriles nd they ust e onverted into nueril output, i.e., they hve to e de-fuified [30]. This proess is wht is lled s defuifition. Defuifition is the proess of produing quntifile result in fuy logi. The defuiftion trnsfors fuy set infortion into nueri dt infortion. This opertion long with the opertion of fuifition is ritil to the design of fuy systes s oth of these opertions provide nexus etween the fuy set doin nd the rel vlued slr doin [3]. There re so ny ethods to perfor the deffuifition, vi., entre of grvity ethod, entre of singleton ethod, xiu ethods, the rginl properties of the entroid ethods & so on. In our work, we use the entre of grvity ethod [3]. The output of the fuy-oordintion unit is further given s the input to the POD, whih in turn is given s input to the UPF ontroller. The POD (Power Osilltion Dping) uses 5 individul loks, vi., the plifition lok, the wsh out link, stge of lg-led loks nd liiter. The odeling of this is done in Siulink nd is shown in the Fig. 9. Note tht the inputs to ontroller (P UPF- nd P UPF- ) re the tive power flow through the UPFs. The output signl of the fuy-pod ointion is the ond signls to the UPFs [33]. Thus, in this wy, the onventionl POD ontrollers re tuned y king use of the fuy-oordintion ontrollers. The ontrol signl generted fro this oined fuy-pod-upf is given to the ulti-hine odel whih is further used to dpen the osilltions [34]. The in dvntge of putting the fuy oordintion ontroller efore the UPF-POD in odeling is the plifition prt of the onventionl ontroller eing odified y the fuy oordintion unit, thus inresing the power syste stility. The overll struture of the fuy-oordintion ontroller used in the work is shown in the lok-digr in the Fig. 8. ontrol signl to UPF- V x P UPF- P UPF- Fuy oordintor ontroller Fuy oordintor ontroller s T + s s T + s w Tw w Tw + st + s T + st + s POD ontroller - POD ontroller - + st + s T 3 T4 + st + s 3 T4 Liiter V in V x Liiter UPF ontroller UPF ontroller Finl ontrol signl to the plnt V in ontrol signl to UPF- Fig. 8 : The Fuy-POD-UPF fuy-ordintor ontroller IV. DEVELOPMENT OF THE SIMULINK MODEL In this setion, we present the developent of the Siulink odel for the ulti-hine FTS sed power syste with nd without the ontroller. The Figs. 0 - show the 3 siultion odels of the 3- genertor, 9-us syste instlled with two Fuy-POD-UPF ontrollers, i.e., first one etween nd nd the 3 rd us nd seond one is t 6 th nd 7 th us when the fult tkes ple ner genertors, & 3. The entire syste odeled in Siulink is losed loop feedk ontrol syste onsisting of the plnts, ontrollers, oprtors, feedk systes, the ux, de-ux, integrtors, stte-spe odels, su-systes, trnsforers, the output sinks (sopes) & the input soures [39]. The Siulink odel is developed fro the si funtions ville in the Siulink lirry & fro the vrious tool-oxes ville. Trnsforers re used for voltge step up & step down purposes. The su-syste shown in the 3 Siulink odels 00

6 Interntionl Journl of Reserh nd Reviews in pplied Sienes Volue, Issue (Noveer 009) onsists of FTS POD ontroller nd it involves 3-stge first order trnsfer funtion onsisting of n plifition lok, wsh-out lok nd stges of led-lg loks & the liiters [35]. The output signl of the Fuy oordinted POD is plifition signl djusted to the UPF POD ontroller & given s input to the UPF. In this wy, the onventionl POD ontrollers re oordinted dynilly y ens of fuy-logi & the plifition prt of the onventionl ontroller is odified y the fuy oordintion ontrollers, thus ting s pre-plifier [38]. Fuy oordinted ontroller onsists of 3 si loks vi., fuifition, inferene, nd the de-fuifition loks. set of 9 fuy rules re written nd lled in the for of file in the developed Siulink odel with the ontroller. The 3 phse to ground syetril fult is de to our ner the first genertor for 00 s fro the first yle to the tenth yle. In the work onsidered shown in the Fig. 0, the oined effet of Fuy-POD-UPF is inly used for power syste osilltion dping [37]. The Figs. 3-5 show the siultion odel of 3-genertor, 9-us syste instlled without the ontrollers for ll the 3 odels. This syste is thus, n open loop ontrol syste euse of the sene of the ontroller [40]. The 3 phse to ground syetril fult is lso de to our ner the first genertor for 00 s fro the first yle to the tenth yle like in the odel with the ontroller in ll the 3 ses. This is done in order to opre the effetiveness of the inorported ontroller in the odel when the fult tkes ple with the odel without the ontroller when the fult tkes ple [36]. To Workspe ontinuous pow ergui Out Power Plnt # Pno=000 MW Delt deltfuy To Workspe3 lok tiefuy To Workspe4 x To Workspe x V PQ I 3-phse V V I I Three-Phse Three-Phse V-I Mesureent V-I Mesureent Three-Phse Series RL Lod 4 V PQ I 3-phse Instntneous tive & Retive Power Power Plnt # Pno=000 MW3 Out Three-Phse Series RL Lod Unit Dely y onn Fuy Logi ontroller To Workspe InOut V* V Susyste I* Unit Dely Unit Dely3 urrent Regultor I* Pulses I onn onn3 onn4 In onn5 onn6 onn7 onn8 onn9 Susyste Susyste onn onn onn3 onn4 onn5 In onn6 onn7 Fuy Logi ontroller InOut Susyste4 V* V I* Unit Dely urrent Regultor I* Pulses I onn8 onn9 Out Power Plnt # Pno=000 MW Fig. 0 : The developed Siulink odel of 3-hine, 9-us syste with Fuy-POD-UPF (with ontroller) fult tking ple t genertor in odel 0

7 Interntionl Journl of Reserh nd Reviews in pplied Sienes Volue, Issue (Noveer 009) To Workspe ontinuous pow ergui lok tiefuy To Workspe4 x To Workspe x V PQ I V PQ I 3-phse Instntneous tive & Retive Power Out Power Plnt # Pno=000 MW 3-phse Instntneous V V tive & Retive Power I I Three-Phse Three-Phse 4 V-I Mesureent V-I Mesureent Power Plnt # Pno=000 MW3 Out Three-Phse Series RL Lod Three-Phse Series RL Lod Unit Dely y onn Fuy Logi ontroller To Workspe InOut V* V Susyste I* Unit Dely Unit Dely3 urrent Regultor I* Pulses I onn onn3 onn4 In onn5 onn6 onn7 onn8 onn9 Susyste Susyste onn onn onn3 onn4 onn5 In onn6 onn7 Fuy Logi ontroller InOut Susyste4 V* V I* Unit Dely urrent Regultor I* Pulses I onn8 onn9 ontrol_ To Workspe6 ontrol_ To Workspe5 Delt Out deltfuy To Workspe3 Power Plnt # Pno=000 MW Fig. : The developed Siulink odel of 3-hine, 9-us syste with Fuy-POD-UPF (with ontroller) fult tking ple t genertor in odel To Workspe ontinuous pow ergui lok tiefuy To Workspe4 x To Workspe x V PQ I V PQ I 3-phse Instntneous tive & Retive Power Out Power Plnt # Pno=000 MW V I Three-Phse V-I Mesureent 3-phse Instntneous V tive & Retive Power I Three-Phse 4 V-I Mesureent Power Plnt # Pno=000 MW3 Out Delt deltfuy To Workspe3 Three-Phse Series RL Lod Unit Dely y onn Fuy Logi ontroller To Workspe InOut V* V Susyste I* Unit Dely Unit Dely3 ontrol_ To Workspe5 urrent Regultor I* Pulses I onn onn3 onn4 In onn5 onn6 onn7 onn8 onn9 Susyste Susyste onn onn onn3 onn4 onn5 In onn6 onn7 onn8 onn9 Three-Phse Series RL Lod InOut Fuy Logi Susyste4 ontroller V* V I* Unit Dely urrent Regultor I* Pulses I ontrol_ To Workspe6 Out Power Plnt # Pno=000 MW Fig. : The developed Siulink odel of 3-hine, 9-us syste with Fuy-POD-UPF (with ontroller) fult tking ple t genertor 3 in odel 3 ontinuous 3 9 pow ergui Genertor Genertor tiewithout Lod Lod 4 To Workspe Lod 3 Genertor side syste Out Delt Sope3 V I 5 Out 4 6 lok 0.5 Pref P Vf Reg_M P 3.8kV 000 MV Out Vf _ 000 MV 000 MV 3.8 kv/30 kv 3 Out Genertor 3 8 Genertor side 3 syste P Vf _ 000 MV 000 MV 3.8 kv/30 kv 3.8kV 000 MV Fig. 3 : The developed Siulink odel of 3-hine, 9-us syste without Fuy sed UPF-POD (without ontroller) & fult tking ple t genertor in odel 3 Lod 0.5 Pref P Vf Reg_M Out

8 Interntionl Journl of Reserh nd Reviews in pplied Sienes Volue, Issue (Noveer 009) ontinuous tiewithout pow ergui To Workspe lok Out V I Out 4 deltwithout To Workspe Delt Sope3 Out Fig. 4 : The developed Siulink odel of 3-hine, 9-us syste without Fuy sed UPF-POD (without ontroller) & fult tking ple t genertor in odel deltwithout To Workspe ontinuous pow ergui Out tiewithout To Workspe lok V I Delt Sope3 Out 4 Out Fig. 5 : The developed Siulink odel of 3-hine, 9-us syste without Fuy sed UPF-POD (without ontroller) & fult tking ple t genertor 3 in odel 3 V. SIMULTION RESULTS Digitl Siultions re rried out in Mtl 7 & ws run for s with & without the ontroller for ll the 3 odels, vi., fult t genertor (odel ), fult t genertor (odel ), fult t genertor 3 (odel 3). The step sie for ll the 6 siultions (3 with ontroller & 3 without ontroller) ws tken to e very sll so tht we get very urte results. For the softwre ipleenttion purposes, we hd tken 3-genertor nine us syste with 0 KV line nd 00 MW genertors. The 3 phse to ground syetril fult is de to our ner the first genertor for 00 s fro the first yle to the tenth yle & & is lso siulted in the Siulink odel. Siilrly, the 3 phse to ground syetril fult is de to our ner the seond genertor for 00 s fro the first yle to the tenth yle & & is lso siulted in the Siulink odel. gin, the 3 phse to ground syetril fult is de to our ner the first genertor for 00 s fro the first yle to the tenth yle & & is this lso siulted in the Siulink odel. Due to the ourrene of the fult, the siultion results were oserved with & without the ontroller for ll the 3 odels fter the ourrene of the fult. The fuy editor with inputs & outputs is shown in the Fig. 6. The eership funtion with the 9 fuy rules used in the developent of the fuy logi 03

9 Interntionl Journl of Reserh nd Reviews in pplied Sienes Volue, Issue (Noveer 009) oordintion shee for the odel is shown in the Fig. 7 only for onveniene. The set of fuy rules is shown in Fig. 8. This reins the se for the reining odels (odel & 3) & is not shown here in this ontext. The response urve of power ngle in degrees vs. tie is otined without the ontroller for ll the 3 odels & is shown in the Figs. 9 - respetively & without the ontrollers for ll the 3 odels in the Figs. - 4 respetively. It is lerly oserved fro the oprtive siultion results tht with the developed ontroller, the dyni perforne of the power syste is quite iproved with the inorportion of the fuy oordintion shee for ll the 3 individul odels. It is lso oserved tht with the ontroller, the power ngle hrteristis urves exhiit very less overshoots & undershoots. The osilltions re lso dped out in lesser tie. The response hrteristis tke less tie to settle & reh the finl stedy stte vlue in ll the 3 ses. Without the ontroller, the response hrteristis tke lot of tie to settle whih n e oserved fro the siultion results in the Figs. 9 - respetively. One thing to oserve is tht sine we hve used only fuy-pod-upfs, one ner the genertor & the other ner the genertor & no UPF ner the genertor 3. euse of this reson (sene of fuy- POD-UPF), the output ner the genertor 3 with the ontrol effet is ore osilltory, of ourse it settles & stility is intined & tkes lot of tie to stilie. The output ner the genertor is less osilltory opred to the output t genertor 3 nd stilies very quikly opred to the previous ounterprt. The output ner the genertor does not exhiit osilltions & re dped out very quikly opred to the power ngle hrteristis ner the genertor & 3. Hene, it n e onluded tht upon the ourrene of the fult ner the respetive genertors, the fult t genertor hs less effet on the syste dynis thn the others. Here, the oprtive stteents of the settling ties with nd without the ontrollers is presented in the for of tle in the tle IV. Without ontroller With ontroller Model Model Model Tle IV : oprtive stteents of the settling ties of the power ngle urves Fig. 9 : Siultion result of power ngle v/s tie (without UPF) for odel, fult t genertor Fig. 0 : Siultion result of power ngle v/s tie (without UPF) for odel, fult t genertor 04

10 Interntionl Journl of Reserh nd Reviews in pplied Sienes Volue, Issue (Noveer 009) Fig. : Siultion result of power ngle v/s tie (without UPF) for odel 3, fult t genertor 3 Fig. : Siultion result of power ngle v/s tie (with UPF & fuy ontrol), fult t genertor for odel Fig. 3 : Siultion result of power ngle v/s tie (with UPF & fuy ontrol), fult t genertor for odel Fig. 4 : Siultion result of power ngle v/s tie (with UPF & fuy ontrol), fult t genertor 3 for odel 3 VI. ONLUSION FTS sed ulti-hine power syste oprising of 3 genertors, 9 uses, 3 lods with nd without the Fuy-POD-UPF ontrollers ws onsidered in this pper y developing 3 Siulink odels. Siulink odels were developed in Mtl 7 with & without the Fuy-POD-UPF ontrollers for the onsidered ulti-hine odel in order to dp out the osilltions. 3 odels were developed. In the st odel, fult tkes ple ner genertor. In the nd odel, fult tkes ple ner genertor. In the 3 rd odel, the fult tkes ple ner genertor 3. The ontrol strtegy ws lso developed y writing set of fuy rules. The fuy ontrol strtegy ws designed sed on the onventionl POD-UPF ontroller & put efore the POD-UPF in the odeling. The in dvntge of putting the fuy oordintion ontroller efore the POD-UPF in odeling is the plifition prt of the onventionl ontroller eing odified y the fuy oordintion unit, thus inresing the power syste stility. Siultions were run in Mtl 7 & the results were oserved on the sope. Grphs of power ngle vs. tie were oserved with nd without the ontroller for ll the 3 odels. Fro the siultion results, it ws oserved tht without the Fuy-POD-UPF ontroller, the nine us syste will e hving ore disturnes, while we hek the power ngle on the first genertor in odel, seond genertor in odel, third genertor in odel 3. There re lot of ringing osilltions (overshoots & undershoots) & the output tkes lot of tie to stilie, whih n e oserved fro the siultion results. ut, fro the inorportion of the Fuy-POD-UPF oordintion syste in loop with the plnt in ll the 3 odels, gve etter results there y reduing the disturnes in the power ngle nd lso the post fult settling tie lso got redued lot. The syste stilies quikly, thus dping the lol ode osilltions nd reduing the settling tie ieditely fter the ourrene of the fult. The developed ontrol strtegy is not only siple, relile, nd y e esy to ipleent in rel tie pplitions. The perforne of the developed ethod in this pper thus deonstrtes the dping of the power syste osilltions using the effetiveness of Fuy-POD-UPF oordintion onepts over the dping of power syste osilltions 05

11 Interntionl Journl of Reserh nd Reviews in pplied Sienes Volue, Issue (Noveer 009) without the Fuy-POD-UPF oordintion shee. Finlly, it ws onluded tht the genertor (odel ) is less stle nd tkes lot of tie to stilie s the UPF is not eing used ner it. Genertor stilies very quikly, wheres genertor tkes soe tie nd genertor 3 tie lot of tie to stilie opred to the other two odels. REFERENES []. L. Gyugi, Unified Power flow onept for flexile trnsission systes, IEE Pro., Vol. 39, No. 4, pp , 99. []. M. Norooin, L. ngquist, M. Ghndri, nd G. nderson, Use of UPF for optil power flow ontrol, IEEE Trns. on Power Systes, Vol., No. 4, pp , 997. [3]. Nvi-Niki nd M.R. Irvni, Stedy-stte nd dyni odels of unified power flow ontroller (UPF) for power syste studies, IEEE 96 Winter Meeting, Pper 96, 996. [4]..D. Shuder, D.M. Hi, nd. Edris. Opertion of the Unified Power Flow ontroller (UPF) under Prtil onstrints, IEEE Trns. On Power Delivery, Vol. 3, No.. pp. 630~639, pr [5]. Gyugyi, L., Unified power flow ontroller onept for flexile trnsission systes, IEE Pro. Gener. Trns. Distri., No.39, pp , 99 [6]. S.N. Dhurvey nd V.K. hndrkr: Perforne oprsion of UPF in oordintion with Optiied POD nd PSS On Dping of Power Syste Osilltions, WSES Trnstions on Power Systes, Issue 5, Vol. 3, pp , My 008. [7]. V.K.hndrkr,.G.Kothri, RFN sed UPF for Iproving trnsient stility Perforne, WSES Trnstions on Power Systes, Issue, Vol., pp.-6, Jn 007. [8]. K.R. Pdiyr, K. U Ro, Modeling nd ontrol of UPF for Trnsient Stility, Elsevier Journl of Eletril Power Energy Systes, N0., pp. -, 999. [9]. H.F. Wng, M. Jeri, Y.J. o, Operting odes nd ontrol intertion nlysis of unified power flow ontrollers, IEE Pro., Gener. Trns. Distri., Vol. 5, Issue, pp , Mr [0]. Lijun i, Istvn Erlih, Fuy oordintion of FTS ontrollers for dping power syste osilltions, Pro. Of the Int. Syp. On Modern Eletroni Power Systes, Wrolw, pp. 5-56, Sept. -3, 00. [].. E. Hd, nlysis of Power Syste Stility Enhneent y Stti VR openstors, IEEE Trns. PWRS, Vol., No. 4, pp. 7, 986. []. S. Lee nd.. Liu, n Output Feedk Stti VR ontroller for the Dping of Genertor Osilltions, Eletri Power Syste Reserh, Vol. 9, pp. 9 6, 994. [3].. Hsnovi nd. Felihi, Geneti lgorith sed Inter-re Osilltion Dping ontroller Design Using MTL, Power Eng. Soiety Suer Meeting 00 IEEE, Vol. 3, pp. 36 4, -5 Jul 00. [4]. M.R. Irvni, P.L. Dndeno, K.H. Nguyen, D. Zhu, nd D. Mrtukul, pplitions of Stti Phse Shifters in Power Systes, IEEE Trns. Power Delivery, Vol. 9, No.3, pp , 994. [5]. M.. ido, Thyristor ontrolled Phse Shifter sed Stilier Design Using Siulted nneling lgorith, Intl. onf. Eletri Power Engineering, PowerTeh, udpest, Pper 99, pp. 307, 9 ug. Sept [6]... Hshni, Youyi Wng, nd T. Lie, Design nd pplition of Nonliner oordinted Exittion nd TPS ontroller in Power Systes, Pro. the 00 erin ontrol onf., Vol., pp. 8 86, 5 7 Jun. 00. [7]. X.R. hen, N.. Phlwthth, U.D. nnkkge, nd. Kule, ontrolled Series openstion for Iproving Stility of Multi-Mhine Power Systes, IEE Pro. Gen. Trns. nd Distri., Vol. 4, No. 4, pp , 995. [8]. J. hng nd J.H. how, Tie-Optil ontrol of Power Systes Requiring Multiple Swithings of Series pitors, IEEE Trns. Power Systes, Vol. 3, No., pp , 998. [9]. Y. Wng, R.R. Mohler, R. Spee, nd W. Mittelstdt, Vrile-Struture Fts ontrollers for Power Syste Trnsient Stility, IEEE Trns. Power Systes, 7()(99), pp [0]. M.. ido, Geneti-sed TS Dping ontroller Design for Power Syste Stility Enhneent, Intl. onf. Eletri Power Engineering - 999, PowerTeh udpest 99, pp. 65, 9 ug. Sep

12 Interntionl Journl of Reserh nd Reviews in pplied Sienes Volue, Issue (Noveer 009) [].. Nvi-Niki, nd M.R. Irvni, Stedy-Stte nd Dyni Models of Unified Power Flow ontroller (UPF) for Power Syste Studies, IEEE Trns. Power Systes, Vol., No. 4, pp , 996. []. H.F. Wng, Dping Funtion of Unified Power Flow ontroller, IEE Pro. Gen. Trns. nd Distri., Vol. 46, No., pp. 8 87, 999. [3]. H.F. Wng, pplition of Modeling UPF Into Multi-Mhine Power Systes, IEE Pro. Gen. Trns. nd Distri., Vol. 46, No. 3, pp , 999. [4]. Y. H. Song,. T. Jons, Flexile Trnsission Systes (FTS), IEE Power nd Energy Series, pp. 30, 999. [5]. S. Hongo, D. Yu. Luo hunlei, novel ethod of power flow nlysis with unified power flow ontroller (UPF), Power Engineering Soiety Winter Meeting, 000, pp , Vol. 4, 3-7 Jn [6]. Nrin G. Hingorni, Lslo Gyugyi Understnding FTS: oneptsnd Tehnology of Flexile Trnsission Systes, Power eletronis sponsored y the Institute of Eletril nd Eletronis Engineers, In. 3 Prk venue, New York, NY , 000. [7]... Eldty, S. O. Fried, S. oreshid, Dping Power Syste Osilltions Using Fuy Logi sed Unified Power Flow ontroller, J. Eletril nd oputer Engineering, pp , 005. [8]. R.P Klyni, G.K. Venygoorthy, M. row, Neuroidentifition of syste preters for the shunt & series rnh ontrol of UPF, Power Engineering Soiety Generl Meeting, 003, IEEE Vol. 4, 3-7 Jul [9]. S. Knnn, S. Jyr, M. M.. Sl, Rel nd Retive Power oordintion for Unified Power Flow ontroller, IEEE Trnstions on Power Systes, Vol. 9, Issue 3, pp , 004. [30]. R. Oriondo, R. lves, UPF Siultion nd ontrol Using the TP/EMTP nd MTL/Siulink Progrs, Trnsission &Distriution onferene nd Exposition, IEEE/PES, pp. 7, 006. [3]. D. Thukr, L. Jenkins, K. Viskh, Iproveent of Syste Seurity with Unified Power Flow ontroller t Suitle Lotions under Network ontingenies of Interonneted Systes, IEE Proeedings Genertion, Trnsission nd Distriution, Vol. 5, Issue 5, pp , 005. [3]. H. Fujit, Y. Wtne, H. kgi, ontrol nd nlysis of Unified Power Flow ontroller, IEEE Trnstions on Power Eletronis, Vol. 4, Issue 6, pp. 0 07, 999. [33].. Lu, L. Hou,. Li, Y. Liu, New Unified Power Flow Fuy ontrol Method, Jr. Innovtive oputing, Infortion nd ontrol, Seond Interntionl onferene, pp , 007. [34]. Y. Qing, L. Noru, T. Undelnd, S. Round, Investigtion of Dyni ontrollers for Unified Power Flow ontroller, Trns. On Industril Eletronis, ontrol, nd Instruenttion, Vol. 3, pp , 996. [35]. M. W. Mustf,.. Zin,.F. Kdir, Stedy Stte nlysis of Power Trnsission Using Unified Power Flow ontroller, Trnsission nd Distriution onferene nd Exhiition, Vol. 3, pp [36]. P. K. Dsh, S. Mishr, nd G. Pnd, Dping Multi-odl Power Syste Osilltion Using Hyrid Fuy ontroller for Series onneted FTS Devies, IEEE Trns. on Power Systes, Vol. 5, No. 4, pp , Nov [37]. P. Kor, F.R. Segundo,. hudhuri, dvned tuning of POD ontrollers for EPS using FTS, Pro. of the 7th World ongress, IF, Seoul, Kore,, pp , Jul. 6-, 008. [38]. Rusejl Sdikovi, Use of FTS Devies for Power Flow ontrol nd Dping of Osilltions in Power Systes, Dotorl Thesis, Swiss Federl Institute of Tehnology, Zurih, 006. [39]. Lutfu Sriulut, Mehet Tuy, nd Đlys Eker, Perforne nlysis of Fuy Logi sed Unified Power Flow ontroller, Pro. World dey of Siene, Engineering nd Tehnology, Vol. 35, ISSN , pp. 3-37, Nov [40]. P.K. Dsh, S. Mishr, Dping of ultiodl power syste osilltions y FTS devies using non-liner Tkgi-Sugeno fuy ontroller, Pro. Eletril Power nd Energy Systes, Vol. 5, pp ,

13 IOGRPHY: Interntionl Journl of Reserh nd Reviews in pplied Sienes Volue, Issue (Noveer 009) D. Oulesu reeived the.e. degree in EEE fro STJ Institute of Tehnology, Rneennur, Krntk, Indi fro Krntk University nd M.Teh. in Power Eletronis fro Dr. M.G.R. University in the yer 000 nd 005 respetively. He hs got tehing experiene of nerly 08 yers. urrently, he is working s ssoite Professor in Mdnplli Institute of Tehnology & Sienes, Mdnplly, hittoor Dist, ndhr Prdesh, Indi in the Dept. of Eletril & Eletronis Engg. & siultneously doing his Ph.D. (Reserh Sholr) in Eletril & Eletronis Engg. fro the prestigious Jwhrll Nehru Tehnologil University (JNTU), Hyderd, ndhr Prdesh, Indi. He hs pulished nuer of reserh ppers in vrious ntionl & interntionl journls & onferenes. His re of interests re neurl networks, fuy logi, rtifiil intelligene, power eletronis, Mtl, FTS, et. Dr. S. F. Kodd reeived the.e. degree in EEE fro STJ Institute of Tehnology, Rneennur, Krntk, Indi fro Krntk University nd the M.Teh. degree in Energy Systes Engg. fro JNTU, Hyderd, Indi in the yer 99. He reeived his Ph.D. degree in Eletril Engg. fro JNTU, Hyderd, Indi in the yer 004. He hs got tehing experiene of nerly yers. urrently, he is working s Professor & Hed in uror ollege of Engg., Hyderd, ndhr Prdesh, Indi in the Dept. of Eletril & Eletronis Engg. He hs pulished nuer of ppers in vrious ntionl & interntionl journls & onferenes & done nuer of in-house & industry projets. He hs lso presented nuer of guest letures nd vrious seinrs nd prtiipted in nuer of ourses, seinrs, workshops, syposius in the vrious prts of the ountry in different institutions nd lso onduted few ourses. He is lso guiding nuer of Ph.D. students. His re of interests re neurl networks, fuy logi, power eletronis, power systes, rtifiil intelligene, Mtl, Renewle energy soures, et. Dr.. V. Snkr R reeived the.e. degree in Eletril Engg. fro Osni University & M.E. degree in Power Systes fro Osni University, Hyderd, ndhr Prdesh, Indi. He reeived his Ph.D. degree in Eletril Engg. fro JNTU, Hyderd, Indi. He otined Diplo in ndidte Mngeent Finne. He hs got tehing experiene of ore thn 0 yers. urrently, he is working s Professor in JNTU ollege of Engg. Hyderd, Indi in the Dept. of Eletril Engg. He hs pulished nuer of ppers in vrious ntionl & interntionl journls & onferenes & done nuer of in-house & industry projets. He is lso guiding nuer of reserh sholrs in vrious topis of engg. He hs speilied in power systes. His reserh interests inlude power syste reliility nd Flexile Trnsission systes, power eletronis & it is pplitions. 08