Page - 174 - in Short-Term Load Forecasting by Artificial Intelligent Technologies

Energies2018,11, 2038 Inorder tocompare the real electricitybill in2016of thecustomer (thecampusuniversity)with theone that itwouldhavehadactingasaDMC, theparts that aredifferent inbothof thebillshave beenemphasized. The real electricitybill emittedby thesupplier in2016 (a retailer) consistsof three components: theaccess fees (regulatedprice), the taxes, andthe“referencedenergy”(which includes someregulatedpricessuchasthecapacitypaymentsor losscoefficientsandallof theunregulatedprices). FinalCostRetailer =AccessFees+ReferencedEnergy+Taxes (13) Takingintoaccount that theaccess feesandtaxesare thesamefor thetwotypesofsupply(retailer andDMC), thecostof the“referencedenergy”for2016 isanalyzed. ForaDMC, thehourlycostof the (referenced)energy isgivenbythe followingsumofcosts: E(h) = ECBC(h)+DMP(h)·EDM(h)+ IMP(h)·EIM(h)+ SAC(h)·EMCB(h) +MDP(h)·EMD(h)+CPP(h)·EMCB(h) (14) where: • E(h)=Energycost in thehour“h”, in€. • ECBC(h)=Energycost in thehour“h” frombilateral contracts, in€. • DMP(h)=DailyMarketprice in thehour“h”, in€/kWh. • EDM(h)=Energybought in theDailyMarket in thehour“h”, inkWh. • IMP(h)= IntradayMarketprice in thehour“h”, in€/kWh. • EIM(h)=Energybought in the IntradayMarket in thehour“h”, inkWh. • SAC(h)=Systemadjustmentcostpassedonto theDMCinthehour“h”, in€/kWh. • EMCB(h)=EnergymeasuredinCentralBars in thehour“h”, inkWh. • MDP(h)=MeasuredDeviationsprice in thehour“h”, in€/kWh. • EMD(h)=MeasuredDeviationofEnergy in thehour“h”=Differencebetweenconsumedenergy andprogrammedenergy in thehour“h”, inkWh. • CPP(h)=Capacitypaymentprice in thehour“h”, in€/kWh. Inthispaper, it isassumedthat theDMCinthestudy(thecampusuniversity)doesnotparticipate inbilateral contractsnor in the IntradayMarket, thus thehourlycostof theenergyreduces to: E(h)=DMP(h)·EDM(h)+ SAC(h)·EMCB(h)+MDP(h)·EMD(h)+CPP(h)·EMCB(h) (15) It ismandatory for theSpanishRegulator (ComisiónNacionaldelMercadoy laCompetencia, CNMC)topublishonitswebsiteadocumentwiththecriterionusedtocalculate theaveragefinalprice (AFP)ofenergy in themarket. TheAFP(seeFigure4) representsanapproximatevalueof thecost ofelectricenergyperkWh,beingonlyareference thatcanvarytoagreateror lesserextent fromthe actualfinalprice,dependingontheconsumer. Specifically, thecapacitypaymentsandthedeviations betweenenergyconsumedandprogrammed,are those thatcanmarkgreaterdifferencesbetweenthe realcostof the invoicingandthecost resultingfromusingtheaveragefinalprice.Asanadditional objective,wecompare thereal costactingasaDMCwiththeresultingcostusingtheAFP. 4.3. CaseStudy:ACampusUniversityasaDMC Todate, all thedependenciesof theTechnicalUniversityofCartagenahavecontractedsupply with a retailer,which is themodality of supplyingof almost all consumers inhighvoltage of the Spanish electrical system. Onlyaround200 consumershavedared toparticipate in theMarket as DMC,see the list in [43]. In2016, thecontractedtariff for theAlfonsoXIII campuswastheATR6.1, 6-periodhighvoltage tariff,withasupplyvoltageof20kV. As ithasbeenstatedbefore, thefinalpriceof the campusuniversity’s invoice is composedof theaccess fees (whichrefers to theuseof thenetwork), the taxes, andthepriceof theenergyfreely 174