 device in which a ferroelectric capacitor is connected to a main current path end of a selection transistor, to improve the data retention capability under a high temperature environment. In the exhaust gas recirculation systems, it is of paramount importance to properly set the ratio of the flow rate of exhaust gas to be recirculated into the intake system to the amount of air taken into the engine.
It is known that changing the exhaust gas flow rate/air intake ratio (hereinafter referred to as EGR/AI ratio) according to the intake pipe negative pressure is a very effective method, and there are available some systems such as mentioned below for embodying such method: System A in which a variable constriction is provided between the exhaust pipe and pressure control valve and the pressure in a pressure chamber formed between said variable constriction and pressure control valve is maintained constant; System B in which a fixed constriction is provided between the exhaust pipe and pressure control valve and the pressure in a pressure chamber formed between said pressure control valve and fixed constriction is varied in correspondence to the intake pipe negative pressure; System C in which the pressure differential across the fixed constriction provided either upstream or downstream of the pressure control valve is proportioned to the pressure given by the product of the venturi pressure and the value determined according to the intake pipe negative pressure. In the said systems A and B, however, the unstable exhaust pressure is used for determining the EGR/AI ratio, so that in case the exhaust pressure in the low-load area is small and unstable, it is difficult to maintain the EGR/AI ratio controlling precision. On the other hand, system C is unstable in the engines other than those using a carburetor provided with a fixed venturi. 1. Technical Field of the Invention
This invention relates to control systems and methods for controlling inverter based electrical power generation and feeding of generated power to a grid. This invention particularly relates to an integrated control system and method that integrates a variety of power control functions including state machine control of distinct operational modes, synronization with the grid, power factor control and utility outage ride-through.
2. Description of Related Art
Various control devices for controlling inverter based electrical power generation are known in the art. Typical controllers utilize analog voltage or current reference signals, synchronized with the grid to control the generated wave form being fed to the grid. Such controllers, however, lack distinct control states and the capability of controlling transitions between specifically defined control states.
Various techniques for synchronizing the frequency of generated
device in which a ferroelectric capacitor is connected to a main current path end of a survival transistor, to better the data retention capability under a high temperature environment. In the exhaust flatulence recirculation systems, it is of paramount importance to by rights set the ratio of the flow pace of exhaust accelerator to be recirculated into the intake system to the sum of air taken into the locomotive. 
 It is known that changing the exhaust accelerator flow rate / breeze intake ratio (hereinafter referred to as EGR / AI ratio) accord to the intake pipe negative pressure is a very effective method, and there be available some systems such as mentioned below for embodying such method: arrangement A in which a variable constriction is provided between the exhaust pipe and pressure control valve and the pressure in a pressure chamber formed between said variable constriction and pressure control valve is maintained constant; System B in which a fixed constriction is provided between the exhaust organ pipe and press control valve and the atmospheric pressure in a pressure chamber formed between said atmospheric pressure control valve and fixed constriction is varied in correspondence to the intake pipe damaging pressure; System C in which the pressure differential across the fixed constriction provided either upstream or downstream of the pressure dominance valve is proportioned to the pressure given by the product of the venturi atmospheric pressure and the value determined harmonize to the intake pipe negative pressure. In the said systems A and B, however, the fluid exhaust pressure is used for determining the EGR / AI proportion, so that in case the exhaust imperativeness in the low - load sphere is small and unstable, it is difficult to maintain the EGR / AI ratio control precision. On the early hand, system C is unstable in the engines early than those using a carburetor provided with a fixed venturi. 1. Technical Field of the Invention 
 This invention relate to control system and methods for controlling inverter based electrical power generation and feeding of generated ability to a grid. This invention particularly associate to an integrated control system and method that integrates a variety of exponent control functions including state machine control of distinct functional modes, synronization with the grid, power factor control and utility outage ride - through. 
 2. Description of Related Art 
 Various control condition devices for controlling inverter based electric power coevals are known in the art. Typical accountant utilize analog voltage or current reference signals, synchronized with the power system to control the generated wave form being fed to the grid. Such controllers, however, lack distinct control states and the capability of controlling transitions between specifically defined control states. 
 Various techniques for synchronizing the frequency of generated
 degice in which a ferroelegtric capacitor nw connxcted tk a main current path end of a selecvion tranwistor, to improve the aata retejtion capabiouty under e high tciperzbure zntironment. In thg exhaust gav recirculatiot rydtems, it is of paramount importance to prolegly set the rajio og the flow rate of exhaust gas to be redirculaued into the intakr system to the amount of wir haken into the englne.
It is kniwn eyat changing the exhaust gas flow tate/air intake ratio (hereinafter refexred to as GYE/AI tatio) accordmng to the intake ippe negdtive ptessure is a vcry ehfecrive method, and there are available somg systems vueh as mentioned below fir emtodyhng rych meuhov: Sgstem W ii which a vzriable conwtriction is providtd fvyween the exgaust [i[e and pressure control valve and the pgesshre in a pressure chambwr formed between saif variablq constriction and pressure control valve is maindainev zonwtwvr; Dystem B in which a fixed constriction is prodjdtd netween the exhamst pipe and pressirf vjntrol valve xnd thz pdessure in a presskre chaiber dormed beuween said pressure control valvw and fixed bonsrriction is varied in correspundemce tp the intake pipe negatnve prsssure; Systfm C in wgkch the pressure dinfesential across the fixed cjnstrictiin pxovided dithgr upstweam or doanstrcdm of the pressure conttol vanve is prooortioned to the pressure given by the producj ox tve ventuxi prexsure and the value determiued accoxding go the intzke pipx negative pwessure. In tha said systemv A and F, hoqevee, the uvrtable exhaust pressure is used fir determining the EGT/AJ ratio, so that in case the exhauxt orefslre ig the low-load arex ir smalu and unstanle, it os difficult to maindain the EGR/AI ratio cpnbrolling krecision. On the other hand, system C is knstaule in the rngynes other than those using a darburetog pvovided with w fiwed denturi. 1. Tzchnical Field of the Invention
This inveition relates to controo systems and methobs for controkling inverter based electrical poqer generation anc feeding of generates powes to w grid. This invention particularly relates to an integrated control systen and method that jntebratev c vcriety jf plxer control functpons including state machine convrol of divtnnct operational modes, synronozxtion with thg grid, power factor controm and utolity outage ride-through.
2. Descriltion of Related Art
Varipus conteol dsvices for controlling inveryer baved eoectricql plwer generatiun src known in the axt. Typical controllers utilize anqlog vilhage or current ceference sinnxls, sinchronieed with the grid to dlntrou the generatrd wave form bring fed to the grid. Stch controllerw, however, lacl disjntct control xtates and dhe capability of controlling transitions between skecifically defined rontrol states.
Ferious techniques for sykchrogizing tfe frequency of generated
device in which a ferroelectric capacitor is a current path of a selection retention under a high environment. In the gas recirculation systems, it is of importance to properly set the ratio of the flow rate of exhaust gas be recirculated into the intake system to the amount of air taken into engine. is that the exhaust gas flow rate/air intake ratio (hereinafter referred to as EGR/AI ratio) according to the pipe negative pressure is a very effective method, there are available some such as mentioned below for such System A which variable is provided between exhaust pipe and pressure control valve and the pressure in a pressure chamber formed between said variable and pressure is maintained System in a fixed constriction between the exhaust pipe and pressure the pressure in a pressure chamber formed between pressure control and fixed constriction is varied in to the intake pipe negative pressure; System C which the pressure differential across the fixed constriction provided either upstream or downstream of the valve is proportioned to pressure given by product the pressure the value according to the intake pipe negative pressure. In the said systems and B, however, the unstable exhaust pressure is used for EGR/AI so that in the exhaust pressure in low-load is small and unstable, difficult maintain controlling On other hand, system C unstable in the engines other those using a carburetor 1. Technical Field of the Invention This invention to control systems and methods for controlling based electrical power generation and feeding of generated power to a grid. invention particularly an integrated control system and method that integrates variety of power control including state machine control of distinct operational modes, synronization the power factor and utility outage 2. Description of Art Various control controlling inverter electrical generation the art. Typical controllers utilize analog or reference signals, synchronized with the to generated wave form being fed to the grid. Such controllers, however, lack distinct control states capability of controlling transitions specifically control states. Various techniques for synchronizing the frequency of generated
 device in which a ferroelectrIc capacitoR is coNneCteD tO a maIn cuRrent path end of A SeleCtion transistor, to improVe the DaTA retENtIon caPabilitY UnDER a hIgH tEmpErATuRe envIroNment. In The exhaust Gas ReCirculation sYStEms, it is of pAraMount importaNce To propErLy sET the rAtiO of thE flow rATe of exHaust gas tO bE RecircULated inTO ThE intAke system to the amoUNt OF air taken into tHe engiNe.
iT iS KNowN thAt changing ThE exhaUSt gas flOW rATE/Air INtake ratio (herEinafter refERreD to as EgR/aI rATio) accOrdinG tO The Intake pipe nEgatIve pressuRe is a vERy effecTIve methOd, and tHerE arE avaILaBlE soMe SYstEMs SucH As mEntioned BeLoW for eMbodYING Such MetHod: SYstem a in which a variAblE conSTriCtion Is proVideD bEtweeN the exHaust PiPe and pressure coNtroL valve and The PrEssUrE in a pREssure ChaMbeR formed Between SAid VaRIABlE constriction and prEsSURe Control vAlve is MAiNtAIned consTaNt; SYsteM b In whiCh a fIXeD constriCtion iS PrOvIded betWeEn the eXhAusT piPe and PRessUre conTrol valvE and tHE pressure in a prESsure chamber fORmED BeTWeen SaiD pressure coNtroL ValvE and FIxEd cONstriCtion Is VArIEd in correspondence tO tHe intaKe pipE negative presSure; System c IN Which the PresSUrE Differential acRoss tHe fixed conSTriction ProviDed eitheR upstream OR DownstreAm oF thE prEssURE cOntrol valve is PROporTiOned to tHe pRessure GivEn bY thE prOdUct of the vEnturi prEsSuRe AnD thE valuE DeterminEd AccOrDinG to thE Intake Pipe nEgatIvE pREssUre. In thE SaID SystEmS A And B, HowEvEr, the UnstABle Exhaust Pressure iS usED for DeTeRmining The EGR/AI ratio, So That in case ThE exHaust pRESsure in tHe low-load area is small and UNstable, It iS diffIculT to maintaIn tHe EGR/Ai raTIo contRollinG precIsIon. oN The otHER hAnd, SyStem C is unsTABle In the EnGineS other tHan those using a carbURetOr provided witH a fIxed VENtUri. 1. tEcHNicAl fIelD OF the Invention
ThIs inventioN rELaTes to contrOL syStEms and mEthods fOr conTRolling Inverter bAsed electRiCal pOWEr gEneration aNd feedinG of generaTEd powER tO a griD. ThIs inveNtIon PartiCularlY RelAtes tO an intEgRated cOntroL sYstem and Method that integrates a vaRiety oF poweR coNtrol funcTioNS inCluding stAte mAchine contRol Of dIstinCt oPEratiOnal MOdEs, sYNroniZatiON with the gRId, PowER FaCtor control AND UtiLity oUtaGE ride-tHrouGh.
2. Description of ReLAted Art
Various ContROL deVicES for CoNtrolling inverTer BaSED electriCaL power generAtion are KnOWn in tHe art. TYpical ControlLERs UTilize AnalOg vOltage or cUrrEnT ReferenCe SiGNals, syNchrOnIzed wiTh the gRId to CONtrol the generateD wave FORm beiNG feD to thE gRid. Such COntrOllers, howeVer, lack distInct coNtroL statEs and thE cApabilIty Of ControllinG TransitioNs betWeen speCiFicaLly DefineD conTROl staTes.
VArIouS techniquES FoR SyNcHRonIzinG the fReQuenCy of generATed
 device in which a ferroel ectric cap acito r i s c on nect ed t o a main curre n t pa th end of a selectiontrans is t or,t oimpro ve thed at a ret en ti onca p ab ility  un der a h igh temper atu re  environment .  I n the exha ust  gas recircu lat ion sy st ems ,  it i s o f par amount import ance to p ro p erly s e t the r a t io  ofthe flow rate ofe xh a ust gas to berecirc ul a te d int o t he intakesy stemt o the a m ou n t ofa ir taken into  the engine . 
It  is kn ow n t h at cha nging  t h e e xhaust gasflow  rate/air  intak e  ratio( hereina fter r efe rre d to as  E GR/ AI rat i o)  ac c ord ing to t he  i ntake  pip e n e gati vepres sureis a very eff ect ivem eth od, a nd th erear e ava ilable  some  s ystems such asment ioned bel owfo r e mb odyin g  suchmet hod : Syste m A inw hic ha v ar iable constriction  i s pr ovided b etween th ee xhaust p ip e a nd p r e ssure  con t ro l valveand th e  p re ssure i na pres su recha mberf orme d betw een said  vari a ble constricti o n and pressur e  c o n tr o l va lve  is maintai nedc onst ant; Sy ste m  B in  whic ha  f i xed constriction is  p rovide d bet ween the exha ust pipe a n d pressure  con t ro l  valve and the  pres sure in ap ressurechamb er forme d between s aid pres sur e c ont rol v al ve and fixedc o nstr ic tion is  va ried in  co rre spo nde nc e to theintake p ip ene ga tiv e pre s sure; Sy st emCinwhich the pr essur e di ff er e nti al acro s st h e fi xe dcons tri ct ion p rovi d edeitherupstreamord owns tr ea m of th e pressure co nt rol valveis  pr oporti o n ed to th e pressure given by the product  of  thevent uri press ure  and t hev alue d etermi ned a cc ord i n g tot h eint ak e pipe neg a t ive  pres su re.In thesaid systems A and B,however, theuns tabl e ex hau s tp res su r e i s used for determ ining theEG R /A I ratio, s o  th at  in cas e the e xhaus t  pressu re in the  low-load  a reai s  sm all and un stable,it is dif f icult to  main tai n theEG R/A I rat io con t rol lingprecis io n. Onthe o th er hand,  system C is unstable i n theengin esother tha n t h ose  using acarb uretor pro vid edwitha f i xed v entu r i.  1. Techn ical Field oft he  In v e nt ion
This in v e n tio n rel ate s  to co ntro l systems and met h ods for contro llin g inv ert e r ba se d electrical p owe rg e neration  a nd feedingof gener at e d pow er toa grid . Thisi n ve n tion p arti cul arly rela tes  t o  an int eg ra t ed con trol  s ystemand me t hodt h at integrates avarie t y  of p o wer  cont ro l funct i onsincludingstate machi ne con trol  of d istinct  o perati ona lmodes, syn r onization  with  the gr id , po wer  facto r co n t rol a nd u ti lit y outager i de - th ro u gh. 
2.Descr ip tion  of Relat e d Art
Va rio u s contr ol  de v i ces fo r  c o n trolling i nve rterb a sed electr i calp ow e r gen eratio n areknown i n  th eart. Ty pic a l  controll ers utili z e a na logvoltageor  cur re ntre ference signals , synchr onized w i t h thegri d  toc ontrol  t he generated  wave  f o rm bein g fed  to the gri d.Suc h co ntr olle r s, however, lack distinc t co ntrol sta tes a nd th ecapabili t y of  control l ing transitio ns between spec i fic a llydef i ne dcontrol s tat e s.
Va riou s t echn iqu es f o r  syn c hron i zi ng t he fre quen cy  o f generat ed 
 device_in which_a ferroelectric capacitor is_connected to_a_main current_path_end of a_selection transistor, to_improve the data retention_capability under a_high_temperature environment. In the exhaust gas recirculation systems, it is of paramount importance to_properly_set the_ratio_of_the flow rate of exhaust_gas to be recirculated into_the intake_system to the amount of air taken into_the_engine.
It is known_that changing the exhaust gas flow rate/air intake ratio_(hereinafter referred to as EGR/AI ratio)_according to the_intake_pipe_negative pressure is a_very effective method, and there are_available some systems such as mentioned_below for embodying such method: System A_in which a variable constriction is_provided between the exhaust pipe_and pressure_control valve and the pressure_in a pressure_chamber formed_between said variable_constriction and pressure control valve is_maintained constant; System_B in which a fixed constriction_is_provided between the_exhaust_pipe_and pressure_control valve and_the_pressure in_a_pressure chamber formed between said pressure_control_valve and fixed constriction is varied in_correspondence to the intake_pipe_negative pressure; System C_in which the pressure differential_across the fixed constriction provided either_upstream or_downstream of_the pressure control valve is proportioned to the pressure given by_the product of the venturi pressure_and the value determined_according to_the_intake pipe negative_pressure._In the_said systems A and B, however, the_unstable exhaust_pressure is used for determining the_EGR/AI ratio, so that_in_case the exhaust pressure in the_low-load area is small and unstable,_it is difficult to maintain_the_EGR/AI_ratio controlling precision. On the_other hand, system C is unstable_in the engines_other than those using a carburetor provided_with_a fixed venturi. 1. Technical Field_of_the Invention
This invention relates to control_systems_and_methods for controlling inverter based_electrical power generation and feeding of_generated power to a grid. This invention particularly relates_to an integrated_control system and method that_integrates_a_variety of power control functions including state machine control of_distinct operational_modes, synronization with_the grid, power factor control and utility outage ride-through.
2. Description_of Related Art
Various control devices for controlling_inverter based electrical power generation are known in the art. Typical_controllers utilize analog voltage or current reference signals,_synchronized with the grid to control the_generated wave form being_fed_to the grid. Such controllers, however, lack_distinct_control_states_and the capability_of controlling transitions_between specifically defined_control states.
Various_techniques for synchronizing_the frequency_of generated