光伏发电并网逆变器控制策略优化研究

华北电力大学（保定）硕士学位论文光伏发电并网逆变器控制策略优化研究姓名：彭龙祥申请学位级别：硕士专业：控制科学与工程；控制理论与控制工程指导教师：田沛2011-03I(MPPT)BOOSTSIMULINKPISVPWMPIPISIMULINKPIIIAbstractToimprovetheefficiencyofthephotovoltaiccells’outputpower,optimizephotovoltaicgrid-connectedgenerationsystem’powerquality,thetextmadeastudyofphotovoltaicinvertermaximumpowerpointtracking(MPPT)control,thereactivepowerandharmoniccontrolmethod.TomaketheinternalresistanceofPVcellsandtheloadresistancematch,outputmaximumpowerinthecurrentenvironmentconditions,thetextadoptedfuzzylogiccontrolwhichwasbasedonBOOSTconvertertostudymaximumpowerpointtrackingcontrol.ThiscontrolmethodwassimulatedwithSIMULINKtoolbox,theresultcertificatedthatfuzzylogiccontrolmethodimprovedtraditionalmethod’sdisadvantages,achievedtheunityofaccuracyandfasttracking.Simultaneously,ItelevatedthevoltageoftheDCside,avoidedthedisadvantagesbyuseoflowfrequencytransformers.Sincethegrid-connectedmethodofphotovoltaicgrid-connectedgenerationsystemadoptedcurrentsourcemethod,thecurrentmusttrackthefundamentalvoltageofgridtomakethesystemoutputcompletelyactivepower.Besides,thefundamentalvoltageofgridisofteninterferedbyharmonicsignals.Simultaneously,invertersbelongtopowerelectronicequipmentwhichworksinastateofhighfrequencyswitching.Itmakestheoutputpowerhasharmonicswhichifarenotwellcontrolled,itwillpollutethegrid’spowerquality.Fortheabovereasons,thetextadoptedsynchronousrepetitiveandPIcontrolwhichbasedonthevoltagespacevectorpulsewidthmodulation(SVPWM)tooptimizethepowerqualityofthesystem.SynchronousrepetitiveandPIcontrolconvertedsystemanalysis’scoordinatespacetosynchronouslyrotatingframe,withtheuseofdecouplecontrol,realizedactivepowerandreactivepowerindividuallycontrolled.Inthisspace,repetitiveandPIcontrolnotonlyrealizedrapidlytrackingofgridvoltage,butalsoeliminatedperiodicdisturbance(harmonics),inthisway,achievedtheaimofimprovingthepowerquality.Finally,thiscontrolmethodwassimulatedwithSIMULINKtoolbox.Byaddingharmonicdisturbanceofthegrid’svoltage,thefeasibilityofthemethodhadbeenproved.Keywords:PhotovoltaicGrid-connectedGenerationSystem;MaximumPowerPointTracking;ReactivePowerandHarmonicControl;FuzzyLogicControl;RepetitiveandPIControl11.11.2200010.1%58.8%3.4%1.3%36.5%129.7[1][2]70%40%30%1/316[2]2008120083674022018563236353731500kV1266500kV1078095718915mm93.8%20mm6.2%89.9%10.1%[3]51-11-1[4]/(MJ/m2)h/a(d/a)I10070003200350II806200~70002400~3200330~350III605200~62002000~2400270~330IV404200~52001600~2000210~270V2042001200~160021064800MJ/m218004000MJ/m21.31.3.13200130%20051656MW200438%762MW27%48%464MW12%156MW96%274MW[5,6]20079100MWp200814721MWp2000~20081033.9%[7]20058810%30%30%2000[8]RPS[9]100%20082GW31%3-550%20083.0GW44%[10]1.3.2[11]4[11]1-1DC/DCDC/ACMPPT1-1DC-DCDC-DCcDMPPTDC-DCBUCKBOOSTBUCK-BOOSTSPWMSPWMSVPWM51.3.3MPPTBOOSTCVTDC-DCcDDC-DCPIPI61.41MPPT2DC-DCDC-DC3172.1IIIVPNPNPNNPPNP-NP-NP-NP-NNNP-NPPP-NPN2-1LILIdIUSRShRSRShRP-NjCLdII-ShR//SR8LIshRjCsRIdIshIU2-1LIP-NjCsLdshURIIIIR+=--2-1dI0()[exp[]1]sdqURIIIAKT+=-2-20IP-Nq191.610C-×sRK231.3810/JK-×TA[13]0sR→shR→∞0[exp[]1]LdLqUIIIIIAKT=-=--2-32.212-1STP175S-24/ACWp175WpVoc44.2VIsc5.2AVm35.2VIm4.95A92-1STP175S-24/AC43±2227g1m1580mm×808mm×35mm15.5kg25Vm35.2V2-22-2(,)mmUI102.2.1[14]2.2.2[14]2.32.10()[exp[]1]sLdLqURIIIIIIAKT+=-=--2-4/aAKq=()exp[]10sqURIAKT+-0()exp[]sLaURIIIIT+=-2-50I=ocUU=mII=mUU=sRLscII=[15]2-3[12]11ln(1/)mscmmsocTIIaUIRU-=+-2-60exp()ocscaUIIT=-2-70ln()ln(/)ocscmmscmsmUIIUIIIRI--=2-8SIMULINKSimpowersystem2-32-421/refRKWm=296refTK=35.2mVV=4.95mIA=44.2ocUV=5.2scIA=2-32-4ocU1121000KW/m2291K296K301K2-52-52-5296K0.6KW/m20.8KW/m21KW/m22-62-62-6132.4MATLABSIMULINK175Wp143.1MPPTrR-DC-DCDC-DCRpvUrDC-DCinUoutUoutIinI3-1DC-DCDC-DC3-1DC-DCinUoutU/outinnUU=outIinIn/outinnII=R2211*outinrefoutinUURRIInn===3-1refR2nRrefRrefRrDC-DCnDC-DCnDC-DCcDcD153.2DC-DCDC-DContofftsT3-23-2ontofftsTcDononconsoffttDttT==+3-2cDDC-DCcD3.2.1BUCKLDCRpvUTVDrainSourceShtdwn3-3BUCKBUCK3-3BUCKT3-4LCRLLiL()ontpvonRLQUUIt=-3-316LCRpvULI3-4T3-5LCRRLofftpvLoffQUIt=3-4CCILLI3-5L3-33-4onpvcpvRonofftUUDUtt==+3-53.2.2BOOSTVDrainSourceShtdwnLDCRTpvU3-6BOOSTBOOST3-6BOOSTTD3-717CRLontpvonLQUIt=3-6LCpvULICI3-7T3-8RCRL()offtpvRLoffQUUIt=-3-7LCRpvULI3-8L3-53-611onoffpvpvRcoffttUUUtD+==-3-8BOOST2sLIIΔ=3-9sI0101ttpvpvpvcsLtUUUIdttDTLLL+Δ===∫3-1018BOOSTpvpvRRUIUI=3-11(3-9)3-103-112(1)2ccsRLDDT=-3-12BOOSTcsRQIDTΔ=3-13QΔ0csRIDTQUCCΔΔ==3-140UΔ0csRIDTCU≤Δ3-15BOOSTBUCK[17,18]1BOOSTBUCK3.3MaximumPowerPointTrackingMPPT[19,20]BOOSTcD,cD3-919+-++coldPnewPDΔDcold=3-9[21]SIMULINKMPPT3.3.1[22,23]3-11kUkIkPkP1kP-1kkPP-kU1kU-1kkUU-1kkPP-3-1020UPABC3-10,kkUIkkkPUI=10kkPP--=1kkPP-=yesyesyesyesnononono*U*U*U*U10kkPP--10kkUU--10kkUU--3-113-10ABC2103.3.2[24,25]*PUI=*dPdIIUdUdU=+3-160dPdU=dIIdUU=-3-17dIdUIU-dIIdUU=-3-12kUkIdU22dIdUdI0dI0dUdIdUIU0dIIdUU+0dPdU0dIIdUU+0dPdU,kkUI1kkdUUU-=-0dU=1kkPP-=nono*U*U1kkdIII-=-dIIdUU=-0dI=0dIIdUU+noyesyesno0dI*U*Uyesno1kkPP-=yesyes3-1223dIIdUU=-dIIdUUe-≤3.3.3++cDΔDcoldeeΔYR+-dudt3-131dPdUdU={NB,NS,Z,PS,PB}dPdU={NB,NS,Z,PS,PB}UΔ[8,8]-17cD={NB,NS,Z,PS,PB}Dc[-3,3]cD[-0.03,0.03]24NBPBNSZOPS[26-28]NSZO