Stability of micro grid system using frequency deviation reduction method | Distributed Generation

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Volume -1, Issue -2, Feb-2017
   ISSN (Online) No: INTERNATIONAL JOURNAL OF RESEARCH REVIEW INENGINEERING AND MANAGEMENT (IJRREM) STABILITY OF MICROGRID SYSTEM USING FREQUENCYDEVIATION REDUCTION METHOD SRUTHI MOHANAN.N PG Scholar, Department ofEEE,Adhiyamaan College of EngineeringHosur-63! #, $amilnadu , %ndiasruthimohanan3&'gmail(com NARAYANAPPA.S Professor, Department of EEE ,Adhiyamaan College of engineeringHosur-63! #,$amilnadu ,%ndianarayanpra)a*al'gmail(com Abstract A +icrogrid system is often su)ected to freuency de.iations due the .ariale nature of rene*ale energy resources connected to it and due to load fluctuations( %n this paper a smartmicrogrid system is considered *here fossil fuel generators and rene*ale energy sources li/e*ind and Photo.oltaic generation are comined *ith fast acting attery storage system( 0oustcontrol strategies are de.eloped for reducing the freuency de.iation *hile consideringsignificant model uncertainties( %n Con.entional system go.ernors and P%D controllers are usedto cope *ith load and rene*ale energy source transients( %n this paper a roust control strategy.ia 1-synthesis approach is considered( $hen ad.antages of our proposed system are compared*ith con.entional methods( All the simulations are conducted in the +atla and simuin/ en.ironment(  Key words - Energy storage, microgrid, po*er systems, smart grids, rene*ale energy( I. INTRODUCTION +icrogrid is a locali2ed grouping of electricity sources and loads that normally operatesconnected to and synchronous *ith the traditional centrali2ed macrogrid, ut can disconnect andfunction autonomously as physical andor economic condition dictate( %t pro.ides a *ay toeffecti.ely integrate .arious Distriuted Generation 4DG5, especially the 0ene*ale EnergySources 40ES5!7($he rene*ale energy resources are integrated *ith traditional microgrids ecause they are clean and aundantly a.ailale in nature 87( %t also pro.ides a good solution for supplying po*er in case of an emergency y the aility to change et*een islanded mode International Journal of Research Review in Engineering and Management (IJRREM) Volume -1,Issue -2, e! -2 1# $age %o &'2-2$age '2   ISSN (Online) No: INTERNATIONAL JOURNAL OF RESEARCH REVIEW INENGINEERING AND MANAGEMENT (IJRREM) and grid connected mode( $he main prolem *ith *ind turine generation is that the output po*er of it is proportional to the cue of .arying *ind speed .elocity( And similarly the output po*er of P9 generation .aries in accordance *ith the atmospheric temperature( $his *ill resultin .ariation in staility and can cause freuency and .oltage fluctuations in a micro grid( $his paper focuses only on freuency de.iation reduction *ith roust control techniues( :or reducing freuency and .oltage .ariaility high-speed, grid-attached storage systems such as atteries ha.e een proposed( Ho* due to high cost there is a need to minimi2e the atterysi2e this *ill strengthen the : and 9 de.iations 37( So to constrain these de.iations *ith in smallrange more ad.anced control techniues are used at the same time minimi2ing attery si2e(9ariety of control methods are used to cope *ith de.iations P%D controller is amongst the one;7( Ho* P%D controller generally has to alance all three gains impact to the *hole systemand may compromise the transient response, such as settling time, o.ershoots, and oscillations( %f the system parameters cannot e precisely estimated or achie.ed, the designed P%D gains maynot resist the uncertainties and disturances and thus present lo* roustness( Another controlmethod is the H-infinite controller the main dra*ac/ of this approach is that the roustness tomodel uncertainties are not addressed( :u22y logic control is another one ut *hile doingsimulation it is .ery difficult to de.elop an appropriate simulation model for the ao.e approach7(%n this paper rene*ale energy generation is an important fact and thus freuency controlis a challenging prolem( Here roust control strategies are used for oth attery system andcon.entional generation system( Controllers are designed to minimi2e the freuency de.iations ut at the same time smaller attery si2e is also an important consideration( %n this controllers aredesigned to cope *ith load transients, <$G and P9 output fluctuations, model uncertainties andmeasurement noiseerrors($he roust controller results are then compared *ith con.entional P%Dcontrollers and it *ill e e.ident that relati.ely smaller amount of storage *ill dramaticallyreduce the freuency de.iations( II. MICROGRID SYSTEM A typical setup of a micro grid *ith attery storage is sho*n n fig(!(=oth con.entionaland rene*ale energy sources 4mainly *ind and solar5 are considered( Energy sources, .arialeloads, and a attery-ased storage system are all connected to the common us ar( $he green loc/s indicate *here the controllers are attached( $he asic idea is that *e need to increase theusage of rene*ale energy system for reducing the fossil fuel consumption and at the same timemaintaining staility( International Journal of Research Review in Engineering and Management (IJRREM) Volume -1,Issue -2, e! -2 1# $age %o &'2-2$age '   ISSN (Online) No: INTERNATIONAL JOURNAL OF RESEARCH REVIEW INENGINEERING AND MANAGEMENT (IJRREM) Fig . Basic !icr gri# s$st%! &it' attac'%# st rag%. International Journal of Research Review in Engineering and Management (IJRREM) Volume -1,Issue -2, e! -2 1# $age %o &'2-2$age ''  >o* freuency load transients are handled y con.entional generators 4fig(85, ut the highfreuency load transients caused y rene*ale energy sources can e suppressed y using theattached storage system( Fig (.Mat'%!atica) ! #%) * c +,%+ti +a) g%+%rati + $he mathematical model of *ind turine generator is sho*n in the fig(8 elo*( $he rotor ladesof the *ind turine catches the *ind and transfers it to the rotor hu( $hrough a gear o? therotor hu is attached to a lo* speed shaft( Fig.-.Mat'%!atica) ! #%) * &i+# trbi+% g%+%rat r $he shaft then an electric generator *here the mechanical energy is con.erted to electricalenergy and deli.ers it to the grid( As the *ind speed .aries the output po*er of the *ind turinegenerator also .aries( As the *ind speed .aries the output po*er of the *ind turine generator also .aries(@ (4!5<hereis the mechanical po*er of *ind turine, ρ is the air density, A@area s*ept ythe turine lades, 9 is the *ind speed, andis the coefficient of performance of the *indturine(%n the controller design process in order to limit the model comple?ity simple transfer functionmodels are used for each of the loc/( $he electrical process of a attery system can e regardedas a lag element, so *ith the time constant of $@ (! s the attery system can e modeled as alag element *hich assumes the lead-acid attery attery (Eui.alent circuit and transfer function
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