MULTIPULSE AC-DC CONVERTERS FOR HARMONIC REDUCTION

Transcription

1 ternatonal Journal on Techncal and Physcal Problems of Enneern (IJTPE) Publshed by ternatonal Oranzaton of IOTPE ISSN IJTPE Journal March 2014 Issue 18 Volume 6 Number 1 Paes MULTIPULSE D ONVERTERS FOR HRMONI REDUTION N.M. Tabatabae 1,2 M. bed 1 N.S. oushehr 1,2. Jafar 1,2 1. Electrcal Enneern Department, Seraj Hher Educaton sttute, Tabrz, Iran n.m.tabatabae@mal.com, mo.abed@outlook.com, naresboush@yahoo.com, al.jafar.860@mal.com 2. Taba Elm ternatonal sttute, Tabrz, Iran bstract The ssue of power qualty now days s a major concerned area of research n the power sector. Wth the adancement n the technoloy now, t s possble to keep power sector free from polluton. the past few years, a lot of work has been done for the reducton of Total Harmonc Dstorton usn dfferent concepts and applcatons. Harmonc treatment can be performed by two methods, fltern, or cancellaton. Here we deal wth the reducton of Total Harmonc Dstorton usn MultPulse to D onerson scheme. Ths paper has en an dea that power qualty can be mproed wth mult pulse conerter, Here 6, 12, 18, 24, 30, 36, 48 pulse conerters hae been modeled and smulated n MTL/Smulnk software. Eery such conerter prodes 6pulse to D conerson, so n order to produce more sets of 6pulse systems, a unform phaseshft s requred and hence wth proper phaseshftn anle, 12, 18, 24, 30, and hher pulse systems hae been produced. The performance mproement of multpulse conerter s acheed for total harmoncs dstorton (THD) n supply current, D oltae rpples. Fure 1. urrent waeform n harmonc (or nonlnear) loads The current on the rht could hae been produced by an electronc arablespeed dre, n Fure 2. Whle the sual dfference n the aboe waeforms s edent, raphcal appearance alone s seldom suffcent for the power enneer requred to analyze the effects of nonsnusodal loads on the power system. One method of descrbn the nonsnusodal waeform s called ts Fourer seres. Jean Fourer was a French mathematcan of the early 19th century who dscoered a specal characterstc of perodc waeforms. Keywords: Harmoncs, MultPulse, Total Harmonc Dstorton (THD), Power Qualty, Rpple ontent. I. INTRODUTION Power system harmonc dstorton has exsted snce the early 1900s, as lon as power tself has been aalable. The earlest harmonc dstorton ssues were assocated wth thrd harmonc currents produced by saturated ron n machnes and transformers, socalled ferromanetc loads. better understandn of power system harmonc phenomena can be acheed wth consderaton of some fundamental concepts, especally, the nature of nonlnear loads, and the nteracton of harmonc currents and oltaes wthn the power system. y defnton, harmonc (or nonlnear) loads are those deces that naturally produce a nonsnusodal current when enerzed by a snusodal oltae source (Fure 1). Each waeform on rht, represents the araton n nstantaneous current oer tme for two dfferent loads each enerzed from a snusodal oltae source. oth current waeforms were produced by turnn on some type of load dece. the case of the current on the left, ths dece was probably a resstance heater. Fure 2. urrent waeform n an electronc arablespeed dre Fourer dscoered that perodc waeforms could be represented by a seres of snusods summed toether. He frequency of these snusods s an nteer multple of the frequency represented by the fundamental perodc waeform. The waeform on the left aboe, for example, s descrbed entrely by one snusod, the fundamental, snce t contans no harmonc dstorton. Ths example waeform s represented by only three harmonc components, but some realworld waeforms (square wae, for example) requre hundreds of snusodal components to fully descrbe them. The mantude of these snusods decreases wth ncreasn frequency. Equalent harmonc components are just a representaton the nstantaneous current as descrbed by the dstorted waeform s what s actually flown on the wre. Ths representaton s necessary because t facltates analyss of the power system. 210

2 ternatonal Journal on Techncal and Physcal Problems of Enneern (IJTPE), Iss. 18, Vol. 6, No. 1, Mar The current drawn by nonlnear loads passes throuh all of the mpedance between the system source and load. Ths current produces harmonc oltaes for each harmonc as t flows throuh the system mpedance. These harmonc oltaes sum and produce a dstorted oltae when combned wth fundamental. The oltae dstorton mantude s dependent on the source mpedance and the harmonc oltaes produced. Fure 3 llustrates how the dstorted oltae s created. s llustrated, nonlnear loads are typcally modeled as a source of harmonc current [1]. Fure 3. reaton of dstorted current II. PROLEMS RESULTING FROM HRMONIS There are many problems, whch can arse from harmonc currents flown n a power system. Harmonc urrents cause hher RMS current and oltae n the system, ths can result n any of problems lsted as below: Equpment Motor Transformer Swtch ear and cables apactors Protecte Relays Power electronc equpment ontrol & nstrumentaton Electronc equpment ommuncaton equpment / P s Neutral cable Telecommuncaton equpment Table 1. Problems resultn from harmoncs Effect of Harmoncs Oerheatn, producton of nonunform torque, ncreased braton Oerheatn and nsulaton falure, nose Neutral lnk falure, ncreased losses due to skn effect and oerheatn of cables Lfe reduces drastcally due to harmonc oerloadn Malfuncton and nusance trppn Msfrn of Thyrstors and falure of semconductor deces Erratc operaton followed by nusance trppn and breakdowns terference Hher Neutral current wth 3rd harmonc frequency, Neutral oerheatn and or open neutral condton Telephonc nterference, malfuncton of senste electroncs used, falure of telecom hardware III. PPLITION GUIDE FOR SOLVING HRMONIS PROLEMS the past few years, a lot of work has been done for the reducton of total harmonc dstorton usn dfferent concepts and applcatons. Fure 4, depct arous technques used wdely for reducton of harmoncs. Harmonc treatment can be performed by two methods, fltern or cancellaton [2, 3]. Many efforts hae been performed to reduce harmonc contents n the utlty lne currents of controlled conerters [8]. Passe flters hae been used n many researches wth dfferent confuratons, but ths technque suffers from bulky, heay flter elements and sometmes causes resonance problems [9]. cte Flters Harmonc Reducton Technques Passe PWM Rectfers Multpulse onerters Sx Twele Ehteen TwentyFour Thrty ThrtySx Fure 4. rous Harmonc Reducton Technques FortyEht cte flters hae been used n many researches and t seems to be an nterestn opton, but ths technque suffers from complexty and hh cost [10]. Hybrd solutons usn acte flters and passe flters are used n hhpower applcatons to mproe passe flter performance. Howeer, ths technque s heay, has hh cost, complex constructon, needs to be lare, and t s not readly aalable from the manufacturer [11, 12]. The multpulse conerter theory deals wth the reducton of harmoncs present on the source sde. Ths theory noles wth the phase shftn of the nput oltae and thereby breakn the nput oltae nto number of pulses. s the pulse number ncreases, the harmoncs present n the nput decreases and the total harmonc dstorton (THD) reduces. The use of sxpulse dode brde rectfer s the nteral part of ths system. Usn multpulse conerters allows a reducton n the sze of the fltern element. Multpulse conerter s a sutable confuraton to reach hh power ratn and hh qualty output waeform besdes. rde rectfer s the basc block requred for D conerson, howeer, full wae and halfwae rectfers are also used up to 120 kw ratns [2]. recent years, the hh power selfcommutated D conerters hae become an trnsc consttuent n many ndustry and power system applcatons, manly due to ther superor features oer conentonal lne commutated Thyrstor based conerters, Such as the flexblty of controlln reacte power from lead to la and the ablty of supplyn acte power to weak or een passe networks. The need to mantan hh effcency, forced these conerters to be connected to hh oltaes, typcally few hundreds of klo olts. Threephase controlled rectfers hae a wde rane of applcatons, from small rectfers to lare Hh Voltae Drect urrent (HVD) transmsson systems. They are used for electrochemcal process, many knds of motor dres, tracton equpment, controlled power supples, and many other applcatons. modern power electroncs conerters, a threephase controlled conerter s commonly used especally as a rectfer n nterfacn djustable Speed Dres (SD) [4], [5] and renewable enery n electrc utltes [6, 7]. Here we deal wth the reducton of total harmonc dstorton usn multpulse to D conerson scheme. IV. TOTL HRMONIS REDUTION Y MULTI PLUSE ONVERTORS The present work s an effort towards analyzn the dfferent multpulse to D conerters (Fure 5) n soln the harmonc problem n a threephase conerter system [13]. 211

3 ternatonal Journal on Techncal and Physcal Problems of Enneern (IJTPE), Iss. 18, Vol. 6, No. 1, Mar PhaseShftn Transformer (0 de) ontnuous poweru Fure 5. Multpulse conerter confuratons PhaseShftn Transformer (20 de)1 PhaseShftn Transformer (0 de) ontnuous poweru PhaseShftn Transformer1 (20 de) Fure 10. Uncontrolled ehteenpulse conerter Fure 6. Uncontrolled sxpulse conerter Fure 11. THD for nput current of uncontrolled ehteenpulse conerter Fure 7. THD for nput current of uncontrolled sxpulse conerter PhaseShftn Transformer (15 de) ontnuous poweru PhaseShftn Transformer (0 de) PhaseShftn Transformer (15 de) PhaseShftn Transformer1 (15 de) PhaseShftn Transformer (15 de) Fure 8. Uncontrolled twelepulse conerter PhaseShftn Transformer (30 de) Fure 12. Uncontrolled twentyfour pulse conerter Fure 9. THD for nput current of uncontrolled twelepulse conerter The effect of ncreasn the number of pulses on the performance of to D conerters has been analyzed. The threephase multpulse to D conerson system employs a phaseshftn transformer and a threephase. Eery such conerter prodes 6pulse to D conerson, so n order to produce more sets of 6pulse systems, a unform phaseshft s requred and hence wth proper phaseshftn anle, 12, 18, 24, 30, and hher pulse systems hae been produced. The performance mproement of multpulse conerter s acheed for total harmoncs dstorton (THD) n supply current, D oltae rpples. 212

4 ternatonal Journal on Techncal and Physcal Problems of Enneern (IJTPE), Iss. 18, Vol. 6, No. 1, Mar PhaseShftn Transformer (05 de) ontnuous poweru PhaseShftn Transformer (15 de) PhaseShftn Transformer (25 de) Fure 13. THD for nput current of uncontrolled twentyfour pulse conerter PhaseShftn Transformer (0 de) PhaseShftn Transformer (12 de)1 ontnuous poweru PhaseShftn Transformer (05 de) PhaseShftn Transformer (15 de) PhaseShftn Transformer1 (25 de) Fure 16. Uncontrolled thrty sxpulse conerter PhaseShftn Transformer (12 de)2 PhaseShftn Transformer (24 de)1 PhaseShftn Transformer1 (24 de) Fure 14. Uncontrolled thrtypulse conerter Fure 17. THD for nput current of uncontrolled sxpulse conerter Multpulse methods nole multple conerters connected so that the harmoncs enerated by one conerter are a celled by harmoncs produced by other conerters. y ths means, certan harmoncs related to number of conerters are elmnated from the power source. multpulse conerters, reducton of nput lne current harmoncs s mportant as reards to the mpact the conerter has on the power system. Fure 5 depct the arous multpulse conerter confuratons. Fure 15. THD for nput current of uncontrolled thrtypulse conerter The results are obtaned for both uncontrolled and controlled conerters for RL load. For uncontrolled conerson, dodes hae been preferred, whle for the controlled conerson, Thyrstor hae been mplemented. The presented smulaton results show the reduced THD at supply sde. These results aree wth the IEEE Standards V. SIMULTION OF UNONTROLLED MULTIPULSE ONVERTERS. SxPulse onerter The sx pulse conerter brde shown n Fure 6. s the basc conerter unt of HVD transmsson s used for rectfcaton, where electrcal power flows from the sde to the D sde and nerson where the power flow s from the D sde to the sde (Fures 6 and 7). 213

5 ternatonal Journal on Techncal and Physcal Problems of Enneern (IJTPE), Iss. 18, Vol. 6, No. 1, Mar PhaseShftn Transformer (0 de) PhaseShftn Transformer (7.5 de) PhaseShftn Transformer (15 de) ontnuous poweru. Twele Pulse onerter Twelepulse conerter s a seres connecton of two fully controlled sx pulse conerter brdes and requres two 3phase systems, whch are spaced apart from each other by 30 electrcal derees (Fures 8 and 9).. Ehteen Pulse onerter ths 18pulse topoloy, the manetc crcut noled s same as that of a 6pulse conerter. Therefore, ths topoloy s comparately a preferred one. phase shft of 20 has been proded between all threephase shft transformers wth star connected secondary (Fures 10 and 11). PhaseShftn Transformer (22.5 de) PhaseShftn Transformer (7.5 de) PhaseShftn Transformer (15 de)1 PhaseShftn Transformer (22.5 de)2 D. TwentyFour Pulse onerter The connecton for 24pulse conerter and the correspondn connectons are shown n Fure 12. Four sx pulse conerters phase shfted by 15 derees from each other, can prode twenty four pulse rectfcaton, obously wth much lower harmoncs on and D sde. Its output oltae would hae 24n ± 1 order harmoncs.e., 23rd, 25th, 47th, 49th harmoncs wth mantudes of 1/23rd, 1/25th, 1/47th, 1/49th, respectely, of the phase shft. PhaseShftn Transformer (30 de) Fure 18. Uncontrolled forty ehtpulse conerter E. ThrtyPulse onerter The connecton for 30pulse conerter and the correspondn connectons are shown n Fure 14, sxpulse conerters phase shfted by 12 derees from each other, can prode thrtypulse conerson, and obously wth much lower harmoncs on and D sde. Its output oltae would hae 30n ± 1 order harmoncs.e., 29th, 31st, 59th, 61st harmoncs wth mantudes of 1/29th, 1/31st, 1/59th, 1/61st, respectely, of phase shft. F. Thrty SxPulse onerter The connecton for 36pulse conerter and the correspondn connectons are shown n Fure 16. Sx sxpulse conerters phase shfted by 10 from each other, can prode thrtysx pulse conerson, and obously wth much lower harmoncs on and D sde. Its output oltae would hae 30n ± 1 order harmoncs. Fure 19. THD for nput current of uncontrolled forty ehtpulse conerter PhaseShftn Transformer (0 de) Fure 20. ontrolled sxpulse conerter ontnuous poweru The characterstc sde current harmoncs enerated by 6pulse conerters are 6n ± 1, haracterstc D sde oltae harmoncs enerated by a 6pulse conerter are of the order 6n ±1. G. Forty EhtPulse onerter For hh power FTS controllers, from the pont of ew of the systems een a twenty four, thrty or Thrtysx pulse conerter wthout flters could hae oltae harmoncs, whch are hher than the acceptable leel. The alternate s to o for 48pulse (Fure 18) operaton wth eht sxpulse conerters phase shfted from each other by 7.5 derees. V. SIMULTION OF ONTROLLED MULTIPULSE ONVERTERS. SxPulse onerter For the smulaton of controlled mult pulse conerters nstead of the dode brde, we use the Thyrstor rde and the correspondn pulses are en (Fure 20). 214

6 ternatonal Journal on Techncal and Physcal Problems of Enneern (IJTPE), Iss. 18, Vol. 6, No. 1, Mar Fure 21. THD for nput current of controlled sxpulse conerter. TwelePulse onerter (Fure 22) Fure 25. THD for nput current of controlled ehteenpulse conerter D. Twenty FourPulse onerter (Fure 26) PhaseShftn Transformer (15 de) ontnuous poweru PhaseShftn Transformer (0 de) ontnuous poweru PhaseShftn Transformer1 (15 de) Fure 22. ontrolled twelepulse conerter PhaseShftn Transformer (15 de)1 PhaseShftn Transformer (15 de)2 PhaseShftn Transformer1 (30 de) Fure 26. ontrolled twenty fourpulse conerter Fure 23. THD for nput current of controlled twelepulse conerter. EhteenPulse onerter (Fure 24) Fure 27. THD for nput current of controlled twenty fourpulse conerter E. ThrtyPulse onerter (Fure 29) PhaseShftn Transformer (0 de) ontnuous poweru PhaseShftn Transformer (20 de)1 PhaseShftn Transformer1 (20 de) Fure 24. ontrolled ehteenpulse conerter Fure 28. THD for nput current of controlled thrtypulse conerter 215

7 ternatonal Journal on Techncal and Physcal Problems of Enneern (IJTPE), Iss. 18, Vol. 6, No. 1, Mar G. FortyEht Pulse onerter (Fure 32) PhaseShftn Transformer (0 de) PhaseShftn Transformer (12 de)1 ontnuous poweru PhaseShftn Transformer (0 de) ontnuous poweru Fure 29. ontrolled thrtypulse conerter F. Thrty SxPulse onerter (Fure 30) PhaseShftn Transformer (12 de)2 PhaseShftn Transformer (24 de)1 PhaseShftn Transformer1 (24 de) PhaseShftn Transformer (7.5 de) PhaseShftn Transformer (15 de) PhaseShftn Transformer (22.5 de) PhaseShftn Transformer (05 de) PhaseShftn Transformer (15 de) PhaseShftn Transformer (25 de) ontnuous poweru PhaseShftn Transformer (7.5 de) PhaseShftn Transformer (15 de)1 PhaseShftn Transformer (22.5 de)2 PhaseShftn Transformer (30 de) Fure 32. ontrolled forty ehtpulse conerter PhaseShftn Transformer (05 de) PhaseShftn Transformer (15 de) PhaseShftn Transformer1 (25 de) Fure 30. ontrolled thrty sxpulse conerter Fure 33. THD for nput current of controlled forty ehtpulse conerter VI. SIMULTION RESULTS ll the data obtaned after smulaton of preously mentoned models usn MTL/Smulnk has been collected here to ease the comparson of factors accounted for.e. THD, rpple content and between uncontrolled and controlled multpulse conerters. Fure 31. THD for nput current of controlled thrty sxpulse conerter 216

8 ternatonal Journal on Techncal and Physcal Problems of Enneern (IJTPE), Iss. 18, Vol. 6, No. 1, Mar Total Harmonc Dstorton (THD) (Fure 34) (a) sxpulse conerter (f) thrty sxpulse conerter () forty ehtpulse conerter (b) twelepulse conerter Fure 34. Percentae THD for RL load, (a) sxpulse conerter, (b) twelepulse conerter, (c) ehteenpulse conerter, (d) twenty fourpulse conerter, (e) thrtypulse conerter, (f) thrty sxpulse conerter, () forty ehtpulse conerter. Percentae Rpple ontent (Fure 35) (c) ehteenpulse conerter (a) sxpulse conerter (d) twenty fourpulse conerter (b) twelepulse conerter (e) thrtypulse conerter (c) ehteenpulse conerter 217

9 ternatonal Journal on Techncal and Physcal Problems of Enneern (IJTPE), Iss. 18, Vol. 6, No. 1, Mar accordn to IEEE standards. The rpple n the nput current waeform decreases as the conerter wth hher pulse number s ben used and the hh qualty output D current wae s obtaned. (d) twenty fourpulse conerter (e) thrtypulse conerter (f) thrty sxpulse conerter () forty ehtpulse conerter Fure 35. Percentae rpple content for RL load, (a) sxpulse conerter, (b) twelepulse conerter, (c) ehteenpulse conerter, (d) twenty fourpulse conerter, (e) thrtypulse conerter, (f) thrty sxpulse conerter, () forty ehtpulse conerter VII. ONLUSIONS The objecte of the present work s to nestate the performance of controlled and uncontrolled multpulse conerters. These conerters are studed n terms of harmonc spectrum of supply current, total harmonc dstorton, rpple content and form factor n the mans. It s concluded therefore that n eneral wth ncrease n number of pulses n multpulse case the performance parameters of these conerters are remarkably mproed. ll the data obtaned after smulaton of preously mentoned models usn MTL/Smulnk has been collected here to ease the comparson of factors accounted for.e. THD, rpple content between uncontrolled and controlled multpulse conerters. Therefore, we can clearly nfer that THD mproes as the number of conerter pulses s ncreased and s n permssble lmts REFERENES [1] L. Ray, L. Hapeshs, Power System Harmonc Fundamental onsderatons, Schneder Electrc US c., p. 22, [2] L. Weln, Desn and Realzaton of Star onnected utotransformer ased 24Pulse D onerter, ternatonal onference on Power System Technoloy, IEEE, [3] P. Srastaa, K. Sanj, Smulaton of MultPulse D onerters for Medum Voltae SD s, VSRD ternatonal Journal of Electrcal, Electroncs & ommuncatons Enneern. Vol. 1, No. 10, pp , Dec [4] V. Nedc, T.. Lpo, Lowost urrentfed PMSM Dre System wth Snusodal put urrents, IEEE Transactons on dustry pplcatons, Vol. 42, No. 3, pp. 3762, May/June [5].I. Maswood,.K. Yusop, M.. Rahman, Noel SuppressedLnk Rectfererter Topoloy wth Near Unty Power Factor, IEEE Transactons Power Electroncs, Vol. 17, No. 5, pp , Sep [6] R. Nak, N. Mohan, M. Roers,. ulawka, Noel Grd terface, Optmzed for UtltyScale pplcatons of Photooltac, WndElectrc, and Fuelell Systems, IEEE Transactons on Power Delery, Vol. 10, No. 4, pp , Oct [7] N. Mohan, Noel pproach to Mnmze Lne urrent Harmoncs n terfacn Renewable Enery Sources wth 3Phase Utlty Systems, IEEE onf. PE, pp , oston, M, Feb [8] H.. Pacheco, G. Jmenez, J. rau, Optmzaton Method to Desn Flters for Harmonc urrent Reducton n a Three Phase Rectfer, IEEE onf. IEP, pp , Puebla, Mexco, u [9] S. hattacharya, D.M. Dan,.. anerjee, ontrol and Reducton of Termnal Voltae Harmonc Dstorton (THD) n Hybrd Seres cte and Parallel Passe Flter System, IEEE PES, Seattle, W, pp , Jun [10] J. Ortea, M. Estee, M. Payan,. Gomez, Reference urrent omputaton Methods for cte Power Flters ccuracy ssessment n the Frequency Doman, IEEE Transactons on Power Electroncs., Vol. 20, No. 2, pp , Mar [11].S. Lee, New lean Power Reactor Systems for Utlty terface of Statc onerters, Ph.D. Dssertaton, Texas &M Unersty, ollee Staton, TX, u [12] M. Saxena, S. Gupta, Smulaton of MultPulse onerter for Harmonc Reducton Usn ontrolled Rectfer, ternatonal Journal of Scence and Research (IJSR), Issue 4, Vol. 2, No. 4, pp , pr [13] D. Snh, H. Mahala, P. Kaur, Modeln and Smulaton of MultPulse onerters for Harmonc Reducton, ternatonal Journal of danced omputer Research, Issue 5,Vol. 2, No. 3, pp. 2432, Sept

10 ternatonal Journal on Techncal and Physcal Problems of Enneern (IJTPE), Iss. 18, Vol. 6, No. 1, Mar IOGRPHIES Naser Mahda Tabatabae was born n Tehran, Iran, He receed the.sc. and the M.Sc. derees from Unersty of Tabrz (Tabrz, Iran) and the Ph.D. deree from Iran Unersty of Scence and Technoloy (Tehran, Iran), all n Power Electrcal Enneern, n 1989, 1992, and 1997, respectely. urrently, he s a Professor n ternatonal Oranzaton of IOTPE. He s also an academc member of Power Electrcal Enneern at Seraj Hher Educaton sttute (Tabrz, Iran) and teaches power system analyss, power system operaton, and reacte power control. He s the General Secretary of ternatonal onference of ITPE, Edtornhef of ternatonal Journal of IJTPE and harman of ternatonal Enterprse of IETPE all supported by IOTPE. He has authored and coauthored of sx books and book chapters n Electrcal Enneern area n nternatonal publshers and more than 130 papers n nternatonal journals and conference proceedns. Hs research nterests are n the area of power qualty, enery manaement systems, IT n power enneern and rtual elearnn educatonal systems. He s a member of the Iranan ssocaton of Electrcal and Electronc Enneers (IEEE). Mohammad bed was born n rdabl, Iran, He receed the.sc. deree from rdabl ranch, Islamc zad Unersty, rdabl, Iran n urrently he s pursun the M.Sc. deree n the Electrcal Enneern Department, Seraj Hher Educaton sttute, Tabrz, Iran, all n Power Electrcal Enneern. Nares Sadat oushehr was born n Iran. She receed her.sc. deree n ontrol Enneern from Sharf Unersty of Technoloy (Tehran, Iran), and Electronc Enneern from entral Tehran ranch, Islamc zad Unersty, (Tehran, Iran), n 1991 and 1996, respectely. She receed the M.Sc. deree n Electronc Enneern from ternatonal Ecocenery cademy (aku, zerbajan), n She s the Member of Scentfc and Execute ommttees of ternatonal onference of ITPE and also the Scentfc and Execute Secretary of ternatonal Journal of IJTPE supported by ternatonal Oranzaton of IOTPE ( Her research nterests are n the area of power system control and artfcal ntellent alorthms. l Jafar was born n Zanjan, Iran n He receed the.sc. deree n Electrcal Enneern from bhar ranch, Islamc zad Unersty, bhar, Iran n He s currently the M.Sc. student n Seraj Hher Educaton sttute, Tabrz, Iran. He s the Member of Scentfc and Execute ommttees of ternatonal onference of ITPE and also the Scentfc and Execute Secretary of ternatonal Journal of IJTPE supported by ternatonal Oranzaton of IOTPE ( Hs research felds are ntellent alorthms applcaton n power systems, power system dynamcs and control, power system analyss and operaton, and reacte power control. 219