BSEN50549?1:2019+A1:2023

BSIStandardsPublication

IncorporatingcorrigendumApril2019

Requirementsforgeneratingplantstobeconnectedinparallelwithdistributionnetworks

Part1:ConnectiontoaLVdistributionnetwork—GeneratingplantsuptoandincludingTypeB

BSEN50549?1:2019+A1:2023

BRITISHSTANDARD

BSEN

50549?1:2019+A1:2023

Nationalforeword

ThisBritishStandardistheUKimplementationof

EN50549?1:2019+A1:2023,incorporatingcorrigendumApril2019.Itsupersedes

BSEN50549?1:2019

,whichwillbewithdrawnon12December2024.

Thestartandfinishoftextintroducedoralteredbyamendmentisindicatedinthetextbytags.TagsindicatingchangestoCENELECtextcarrythenumberoftheCENELECamendment.Forexample,textalteredbyCENELECamendmentA1isindicatedbyà.

TheUKparticipationinitspreparationwasentrustedtoTechnical

CommitteeGEL/8,SystemsAspectsforElectricalEnergySupply.

Alistoforganizationsrepresentedonthiscommitteecanbeobtainedonrequesttoitscommitteemanager.

Contractualandlegalconsiderations

Thispublicationhasbeenpreparedingoodfaith,howevernorepresentation,warranty,assuranceorundertaking(expressorimplied)isorwillbemade,andnoresponsibilityorliabilityisorwillbeacceptedbyBSIinrelationtotheadequacy,accuracy,completenessorreasonablenessofthispublication.Allandanysuchresponsibilityandliabilityisexpresslydisclaimedtothefullextentpermittedbythelaw.

Thispublicationisprovidedasis,andistobeusedatthe

recipient’sownrisk.

Therecipientisadvisedtoconsiderseekingprofessionalguidancewith

respecttoitsuseofthispublication.

Thispublicationisnotintendedtoconstituteacontract.Usersareresponsibleforitscorrectapplication.

?TheBritishStandardsInstitution2023

PublishedbyBSIStandardsLimited2023ISBN9780539229707

ICS29.160.20

CompliancewithaBritishStandardcannotconferimmunityfromlegalobligations.

ThisBritishStandardwaspublishedundertheauthorityoftheStandardsPolicyandStrategyCommitteeon28February2019.

Amendments/corrigendaissuedsincepublication

Date Textaffected

30April2019 ImplementationofCENELECcorrigendumApril2019:TableF.1corrected

31December2023 ImplementationofCENELECamendmentA1:2023

EUROPEANSTANDARDNORMEEUROPéENNEEUROP?ISCHENORM

EN50549-1:2019+A1

October2023

ICS29.160.20 SupersedesCLC/TS50549-1:2015,

EN50438:201

3,

EN

50438:201

3/IS1:2015

EnglishVersion

Requirementsforgeneratingplantstobeconnectedinparallelwithdistributionnetworks-Part1:ConnectiontoaLVdistributionnetwork-GeneratingplantsuptoandincludingTypeB

Exigencesrelativesauxcentralesélectriquesdestinéesàêtreraccordéesenparallèleàdesréseauxdedistribution-Partie1:RaccordementàunréseaudedistributionBT-Centralesélectriquesjusqu'auTypeBinclus

AnforderungenfürzumParallelbetriebmiteinemVerteilnetzvorgeseheneErzeugungsanlagen-Teil1:AnschlussandasNiederspannungsverteilnetzbiseinschlie?lichTypB

ThisEuropeanStandardwasapprovedbyCENELECon2018-08-09.CENELECmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEuropeanStandardthestatusofanationalstandardwithoutanyalteration.

Up-to-datelistsandbibliographicalreferencesconcerningsuchnationalstandardsmaybeobtainedonapplicationtotheCEN-CENELECManagementCentreortoanyCENELECmember.

ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).AversioninanyotherlanguagemadebytranslationundertheresponsibilityofaCENELECmemberintoitsownlanguageandnotifiedtotheCEN-CENELECManagementCentrehasthesamestatusastheofficialversions.

CENELECmembersarethenationalelectrotechnicalcommitteesofAustria,Belgium,Bulgaria,Croatia,Cyprus,theCzechRepublic,Denmark,Estonia,Finland,FormerYugoslavRepublicofMacedonia,France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,theNetherlands,Norway,Poland,Portugal,Romania,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,TurkeyandtheUnitedKingdom.

EuropeanCommitteeforElectrotechnicalStandardizationComitéEuropéendeNormalisationElectrotechniqueEurop?ischesKomiteefürElektrotechnischeNormung

CEN-CENELECManagementCentre:RuedelaScience23,B-1040Brussels

?2019CENELECAllrightsofexploitationinanyformandbyanymeansreservedworldwideforCENELECMembers.

Ref.No.EN50549-1:2019E

BSEN

50549?1:2019+A1:2023

EN50549-1:2019+A1:2023(E)

BSEN

50549?1:2019+A1:2023

EN50549-1:2019+A1:2023(E)

PAGE

10

PAGE

11

Contents Page

Europeanforeword 4

Introduction 5

Scope 8

Normativereferences 9

Termsanddefinitions 9

General 9

Plant,moduleandunit 11

Power 14

Voltage 15

Circuittheory 16

Protection 18

Control 22

Requirementsongeneratingplants 23

General 23

Connectionscheme 24

Choiceofswitchgear 25

General 25

Interfaceswitch 25

Normaloperatingrange 25

General 25

Operatingfrequencyrange 25

Minimalrequirementforactivepowerdeliveryatunderfrequency 26

Continuousoperatingvoltagerange 27

Immunitytodisturbances 27

General 27

Rateofchangeoffrequency(ROCOF)immunity 27

Under-voltageridethrough(UVRT) 28

Over-voltageridethrough(OVRT) 29

Phasejumpimmunity 30

Activeresponsetofrequencydeviation 30

Powerresponsetooverfrequency 30

Powerresponsetounderfrequency 33

Powerresponsetovoltagechanges 36

General 36

Voltagesupportbyreactivepower 36

Voltagerelatedactivepowerreduction 41

Shortcircuitcurrentrequirementsongeneratingplants 41

EMCandpowerquality 42

Interfaceprotection 43

General 43

Void 44

Requirementsonvoltageandfrequencyprotection 45

Meanstodetectislandsituation 47

Digitalinputtotheinterfaceprotection 48

Connectionandstartingtogenerateelectricalpower 48

General 48

Automaticreconnectionaftertripping 48

Startingtogenerateelectricalpower 48

Synchronization 49

Ceasingandreductionofactivepoweronsetpoint 49

Ceasingactivepower 49

Reductionofactivepoweronsetpoint 49

Remoteinformationexchange 49

Requirementsregardingsinglefaulttoleranceofinterfaceprotectionsystem

andinterfaceswitch 50

AnnexA(informative)Interconnectionguidance 51

General 51

Networkintegration 51

Clustersofsingle-phasegeneratingunits 52

AnnexB(informative)Void 53

AnnexC(informative)ParameterTable 54

AnnexD(informative)Listofnationalrequirementsapplicableforgeneratingplants 59

AnnexE(informative)LossofMainsandoverallpowersystemsecurity 61

AnnexF(informative)Examplesofprotectionstrategies 62

Introduction 62

General 62

Generalities 62

Detectionofunwantedislands 62

ProblemswithuncontrolledislandinginMVnetworks 63

Safety 63

Gridparameters 63

Reclosingoperations 63

Protectionofislandsagainstovercurrents 63

Protectionagainstphasetoearthfaults 63

Examplestrategy1 64

Examplestrategy2 67

AnnexG(normative)Abbreviations 69

AnnexH(informative)RelationshipbetweenthisEuropeanstandardandthe

COMMISSIONREGULATION(EU)2016/631 70

Bibliography 71

Europeanforeword

Thisdocument(EN50549-1:2019)hasbeenpreparedbyCLC/TC8X“Systemaspectsofelectricalenergysupply”.

Thefollowingdatesarefixed:

latestdatebywhichthisdocumenthastobeimplementedatnationallevelbypublicationofanidenticalnationalstandardorbyendorsement

(dop)

2019-08-01

latestdatebywhichthenationalstandardsconflictingwiththisdocumenthaveto

bewithdrawn

(dow)

2022-02-01

Thisdocumentsupersedes

EN50438:2013

andCLC/TS50549-1:2015.

ThisEuropeanStandardrelatestoboththeRfGEuropeanNetworkCodeandcurrenttechnicalmarketneeds.Itspurposeistogivedetaileddescriptionoffunctionstobeimplementedinproducts.

ThisEuropeanStandardisalsointendedtoserveasatechnicalreferenceforthedefinitionofnationalrequirementswheretheRfGEuropeanNetworkCoderequirementsallowflexibleimplementation.Thespecifiedrequirementsaresolelytechnicalrequirements;economicissuesregarding,e.g.thebearingofcostarenotinthescopeofthisdocument.

CLC/TC8XplansfuturestandardizationworkinordertoensurethecompatibilityofthisEuropeanStandard(EN)withtheevolutionofthelegalframework.

Attentionisdrawntothepossibilitythatsomeoftheelementsofthisdocumentmaybethesubjectofpatentrights.CENELECshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.

EuropeanforewordtoamendmentA1

ThisdocumentEN50549-1:2019/A1:2023hasbeenpreparedbyTC8X“Systemaspectsofelectricalenergysupply”.

Thefollowingdatesarefixed:

latestdatebywhichthisdocumenthastobeimplementedatnationallevelbypublicationofanidenticalnationalstandardorbyendorsement

latestdatebywhichthenationalstandardsconflictingwiththisdocumenthavetobewithdrawn

(dop) 2024-09-21

(dow) 2026-09-21

ThisdocumentamendsEN50549-1:2019.

Thisamendmentincludesthefollowingsignificanttechnicalchanges:

Introductionofaphasejumpimmunityrequirement.

HarmonizingtheROCOFimmunityrequirementforsynchronousandnon-synchronousgeneratingtechnology.

ModifyingFRTfortypeAfromrecommendationtorequirement.

ProvidingadditionaldetailforEESSincaseofoverfrequency.

Attentionisdrawntothepossibilitythatsomeoftheelementsofthisdocumentmaybethesubjectofpatentrights.CENELECshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.

Anyfeedbackandquestionsonthisdocumentshouldbedirectedtotheusers’nationalcommittee.AcompletelistingofthesebodiescanbefoundontheCENELECwebsite.

Introduction

Rationaleforthecontentandstructureofthisdocument.

Foreword

ThisExplanatoryNoteexplainstherationalebehindthecontentandstructureofprEN50549-1andprEN50549-2.DuetotheuniquerelationshipbetweenCOMMISSIONREGULATION2016/631(RfG)andtheEN50549Series,andbasedonthecommentsreceivedattheenquirystageofprEN50549-1andprEN50549-2,TC8XWG03decidedtodraftthisexplanatorynoteinordertoprovidenationalcommitteesandthewiderpublicwithanunderstandingoftheserationale.

IncreasedScopeofEN50549inrelationtoRfG

Inthetraditionof

EN5043

8,TC8XWG03intended,inwritingofprEN50549,toincludeallcapabilitiesofgeneratingplantsthatareneededtooperatetheseinparalleltodistributionnetworks.Thisincludesissuesnecessaryforastabledistributionnetworkmanagementaswellasthemanagementoftheinterconnectedsystem.AsRfGisfocusedontheinterconnectedsystem,itislogicalthat,takingintoaccountfurtherneedsfordistributionnetworkmanagement,furtheraspectsareincluded.

Introductionof“Responsibleparty”

DuringthenationalimplementationprocessofCOMMISSIONREGULATION(EU)2016/631,differenttypesofresponsiblepartiesplayaroleintherefinementofthenon-exhaustiverequirements.Ineachmembercountry,theNationalRegulatoryAuthorityapprovesthisnationalimplementation.Dependingonthenationalregulatoryframework,thismightresultinavarietyofdocuments:nationallaws,decreesorregulations,technicalspecifications,orrequirementsoftransmissionanddistributionsystemoperators.Therefore,asexplainedinthescope,EN50549-1andEN50549-2refertothe“responsibleparty”whererequirementshavetobedefinedbyanactorotherthantheDSO.Howeverwhenageneratingplantisbuiltandconnectedtothedistributionnetwork,typicallythedistributionsystemoperatorprovidestheplantdeveloperallthetechnicalrequirementstobefulfilled.

Useofterms

TermsanddefinitionsareselectedtoachieveconsistencywithEN60050,IEV(cf.)andCENELECterminology,recognizingthattermsinCOMMISSIONREGULATION(EU)2016/631maydeviate.

Additionalrequirementsfordistributionsystemmanagement

ThefollowingrequirementsarestatedinEN50549fordistributionsystemmanagementreasons,whichmightnotberequiredinRfGorifrequiredinRfG,arenotrequiredfortypeA.AsDirective714/20098(7)limitsthescopeofRfGtoissueseffectingthecrossbordertradeofelectricity,requirementsincludedsolelyfortheneedofdistributionsystemmanagementareconsideredbeyondthescopeofRfG.

ConnectionschemeandCoordinationofswitchgear,

Voltageoperatingrange,

Reactivepowercapabilityandcontrolmodes,

Voltagerelatedactivepowerreduction,

Interfaceprotectionincludingthedetectionofislandsituations,

Connectionandreconnectiontothegrid,

Generationcurtailment,

Remoteinformationexchange,

Additionalrequirementsforstabilityoftheinterconnectedsystem

Additionally,requirementsrelevantforthestabilityoftheinterconnectedsystemsareincludedincaseofovervoltageridethrough(OVRT)asthisisnotdealtwithinRfG.DuetothelongdurationofRfGdevelopmentandthefastdevelopmentofdecentralisedgenerationinEuroperobustnesstovoltageswellsisconsideredtobeofhighimportance,butapparentlycouldnotbeincludedintoRfG.

Aselectricalenergystoragesystem(EESS),areexcludedfromthescopeofRfG,butareincludedinthescopeoftheEN50549Series,EN50549alsoincludesthefurtherrequirementofactivepowerfrequencyresponsetounderfrequency(LFSM-U)toelectricalenergystoragesystems.Thisrequirementisconsideredofgreatimportanceinviewoftheexpectedfastincreaseofelectricalenergystorageforthenextyearsandisconsiderednottoaffectthecostofelectricalenergystoragesystemsifconsideredduringtheirdesign.

DetailsontheoperationoftheLFSM-O

Duringtheenquirystage,somecommentsreportedthatcertaindetailsinthechapterregardingtheoperationoftheLFSM-O(e.g.intentionaldelay,operationwithdeactivationthreshold)wereviolatingtheRfG.ThesetopicshavebeenfurtherevaluatedconsultingtheEuropeanStakeholderCommittee(ESC-GC)andTC8XWG03couldnotconcludeinthesameway.ThefactthattheseoperationsarenotforeseenintheRfGisconsiderednotsufficienttostateanyviolation.Thereforethesedetailsarekeptwithadditionalinformationontheiruse.

ImplementationofUVRTandLFSM-UtoavoidlegalconflictwithRfG

àUnderVoltageRideThrough(UVRT)requirementsaredefinedinRfGformodulestypeB,typeCandtypeD.ThereisnomentioningofthistopicfortypeAmodules.

Nevertheless,UVRTisseenasanimportantrequirementinsomememberstatesevenforsmallgenerationmodulesliketypeA.

NOTE Atthetimeofwriting,LVRTrequirementsfortypeAmoduleshavebeenimplementedinthefollowing

countries:Austria,CzechRepublic,Germany,Portugal(forPGMof15kWandhigher),Switzerland.

FromalegalpointofviewtherearetwocontradictingopinionsonwhetheritisallowedorforbiddentorequireUVRTfortypeAmodules.

Opinion1:ItcanberequiredbecausethetopicisnotdealtwithfortypeAmodules.

Option2:ItcannotberequiredbecausethetopicUVRTisdealtwithintheRfG.NotmentioningUVRTfortypeAinRfGthereforemeansthatitcannotberequiredfortypeAmodules.

TC8XWG03adoptstheviewofACERasexpressedin“ACERMonitoringoftheImplementationoftheGridConnectionNetworkCodes”11November2021Item3.3.4#DwhereitstatestheGermanUVRTrequirementforTypeAascompliantwithNCRfG.

ThissameexplanationcanbeappliedtotherequirementsregardingLimitedFrequencySensitiveMode-Underfrequency(LFSM-U).InRfG,thisLFSM-UissolelydefinedfortypeCandtypeDmodules.InEN50549,LFSM-Uisdefinedasarecommendation(should)forgeneratingmodulesoftypeAandtypeB.Thesoleexceptioniselectricalenergystoragesystemshavingarequirement(shall).ThesesystemsarecurrentlynotwithinthescopeoftheRfG.

AnnexH-RelationshipbetweenthisEuropeanstandardandtheCOMMISSIONREGULATION(EU)2016/631.

ManufacturersofgeneratingunitsandplantsshallcomplywithallrelevantEUDirectivesandRegulations.ForthespecificfunctionofconnectingthegeneratingplantwiththeelectricsystemthereferenceregulationisCOMMISSIONREGULATION(EU)2016/631(NCRfG).

SincetheEN50549-1and-2arecoveringalltechnicalrequirementsfortypeAandtypeBgeneratingunits,modulesandplants,itisconsideredhelpfultoprovidetheinformationwhichclauseofthestandardsupportswhicharticleoftheRfGinastructuredinformativeannexwithinthestandard.

ForotherEUDirectivesandRegulations(e.g.LVD,MDorGAR)itisaformaltaskgiventoCCMCtoincludesuchaninformativeAnnexZZbasedonastandardizationrequestfromtheEU.Itisfinallyreviewedbythenewapproachconsultant(NAC)fortherelevantDirectiveorRegulation,priortothelistingofthestandardintheofficialjournaloftheEU(OJEU)providingthen“presumptionof

conformity”.Thismeansthatifaproductiscompliantwiththestandard,theDirectiveorRegulationsisfulfilledtoo.

CLCTC8Xisfullyaware,thatthisofficialprocedureisnotincludedintheRfG.ThereforeCLCTC8XWG3draftedAnnexH.InAnnexHtherelationshipbetweentheclausesandthearticlesisshown.Itisconsidered,thatgeneratingplantscompliantwiththeclausesofthestandardsarealsocompliantwiththearticlesintheRfG.Ofcourse,thisdoesnotprovide“presumptionofconformity”asalistedstandardintheOJEUwouldprovide.NeverthelessitwillbehelpfulfortheindustrywhenperformingtheconformityassessmentagainstRfG.

Scope

Thisdocumentspecifiesthetechnicalrequirementsfortheprotectionfunctionsandtheoperationalcapabilitiesforgeneratingplants,intendedtooperateinparallelwithLVdistributionnetworks.

ForpracticalreasonsthisdocumentreferstotheresponsiblepartywhererequirementshavetobedefinedbyanactorotherthantheDSOe.g.TSO,memberstate,regulatoryauthoritiesaccordingtothelegalframework.TypicallytheDSOwillinformtheproducerabouttheserequirements.

NOTE1ThisincludesEuropeannetworkcodesandtheirnationalimplementation,aswellasadditionalnationalregulations.

NOTE2Additionalnationalrequirementsespeciallyfortheconnectiontothedistributionnetworkandtheoperationofthegeneratingplantmayapply.

TherequirementsofthisEuropeanStandardapply,irrespectiveofthekindofenergysourceandirrespectiveofthepresenceofloadsintheproducer’snetwork,togeneratingplants,generatingmodules,electricalmachineryandelectronicequipmentthatmeetallofthefollowingconditions:

convertinganyenergysourceintoACelectricity;

generatingmodulescapacityoftypeBorsmalleraccordingtoCOMMISSIONREGULATION(EU)2016/631whileconsideringnationalimplementationforthedecisionregardingpowerlimitsbetweenAandBtypesandBandCtypes;

connectedtoandoperatedinparallelwithanACLVdistributionnetwork.

NOTE3 GeneratingplantsconnectedtoaMVdistributionnetworkfallintothescopeofEN50549–2.NOTE4 Electricalenergystoragesystems(EESS)inmeetingtheconditionsaboveareincluded

Ifgeneratingmodulesofdifferenttype(AorB)arecombinedinoneplant,differentrequirementsapplyforthedifferentmodulesbasedonthetypeofeachmodule.

EXAMPLE:Ifageneratingplantconsistsofmultiplegeneratingmodules(see3.2.1),accordingtoCOMMISSIONREGLUATION(EU)2016/631thesituationmightoccur,thatsomegeneratingmodulesareoftypeAandsomeareoftypeB.

UnlessspecifiedotherwisebytheDSOandtheresponsibleparty,generatingplantsconnectedtoamediumvoltagedistributionnetworkwithamaximumapparentpowerupto150kVAcancomplywiththisEuropeanStandardasalternativetotherequirementsofEN50549-2.AdifferentthresholdmaybedefinedbytheDSOandtheresponsibleparty.

Thisdocumentrecognizestheexistenceofspecifictechnicalrequirements(e.g.gridcodes)oftheDSOoranotherresponsiblepartywithinamemberstateandthesemustbecompliedwith.

Excludedfromthescopeare:

theselectionandevaluationofthepointofconnection;

powersystemimpactassessmente.g.assessmentofeffectsonpowerquality,localvoltageincrease,impactonlineprotectionsoperation;

connectionassessment,thesetoftechnicalverificationsmadeaspartoftheplanningoftheconnection;

islandoperationofgeneratingplants,bothintentionalandunintentional,wherenopartofthedistributionnetworkisinvolved;

four-quadrantrectifierofdrivesfeedingbreakingenergybackintothedistributionnetworkforlimiteddurationwithnointernalsourceofprimaryenergy;

uninterruptiblepowersupplywithdurationofparalleloperationlimitedto100ms;

NOTE5ParalleloperationduetomaintenanceofuninterruptiblepowersupplyunitsisnotseenaspartofnormalUPSoperationandthereforenotconsideredinthisdocument.

requirementsforthesafetyofpersonnelastheyarealreadyadequatelycoveredbyexistingEuropeanStandards.

theconnectionofageneratingunit,moduleorplantintoaDCnetwork

Normativereferences

Thefollowingdocumentsarereferredtointhetextinsuchawaythatsomeoralloftheircontentconstitutesrequirementsofthisdocument.Fordatedreferences,onlytheeditioncitedapplies.Forundatedreferences,thelatesteditionofthereferenceddocument(includinganyamendments)applies.

EN50549-2,Requirementsforgeneratingplantstobeconnectedinparallelwithdistributionnetworks

-Part2:ConnectiontoaMVdistributionnetwork-GeneratingplantsuptoandincludingTypeB

àEN50549-10,Requirementsforgeneratingplantstobeconnectedinparallelwithdistributionnetworks-Part10:Testsforconformityassessmentofgeneratingunits

àTextdeleted

EN61000-4-30,Electromagneticcompatibility(EMC)—Part4-30:Testingandmeasurementtechniques—Powerqualitymeasurementmethods(

IEC61000-4-3

0)

HD60364-1,Low-voltageelectricalinstallations—Part1:Fundamentalprinciples,assessmentofgeneralcharacteristics,definitions(IEC60364-1)

HD60364-5-551,Low-voltageelectricalinstallations—Part5-55:Selectionanderectionofelectricalequipment—Otherequipment—Clause551:Low-voltagegeneratingsets(IEC60364-5-551)

Termsanddefinitions

Forthepurposesofthisdocument,thefollowingtermsanddefinitionsapply.

ISOandIECmaintainterminologicaldatabasesforuseinstandardizationatthefollowingaddresses:

IECElectropedia:availableat

/

ISOOnlinebrowsingplatform:availableat

/obp

Note TermsanddefinitionsareselectedtoachieveconsistencywithIEV(cf.

)andCENELECterminology,recognizingthattermsinCOMMISSIONREGULATION(EU)2016/631maydeviate.

General

3.1.1

distributionnetwork

ACelectricalnetwork,includingcloseddistributionnetworks,forthedistributionofelectricalpowerfromandtothirdpartiesconnectedtoit,toandfromatransmissionoranotherdistributionnetwork,forwhichaDSOisresponsible

Note1toentry:Adistributionnetworkdoesnotincludetheproducer’snetwork.

3.1.2

closeddistributionnetwork

systemwhichdistributeselectricitywithinanindustrial,commercialorsharedservicessite,thatisgeographicallyconfined,anddoesnotsupplyhouseholdscustomers(withoutexcludingtheoptionofasmallnumberofhouseholdsservedbythesystemthathaveanemploymentorsimilarassociationswiththeownerofthesystem)

Note1toentry:Acloseddistributionnetworkwilleitherbeusedtointegratetheproductionprocessesofthenetworkusersforspecificortechnicalreasonsordistributeelectricityprimarilytotheoperatorofthecloseddistributionnetworkorhisrelatedundertakings.

[SOURCE:Directive2009/72/EC,article28,modified]

3.1.3

distributionsystemoperatorDSO

naturalorlegalpersonresponsibleforthedistributionofelectricalpowertofinalcustomersandforoperating,ensuringthemaintenanceofand,ifnecessary,developingthedistributionnetworkinagivenarea

Note1toentry:Asthisdocumentisapplicabletodistributiongrids,DSOisusedforrelevantsystemoperatoraccordingtoarticle2(13)ofCOMMISSIONREGULATION2016/631.

Note2toentry:Insomecountries,thedistributionnetworkoperator(DNO)fulfilstheroleoftheDSO.

3.1.4

transmissionsystemoperator

naturalorlegalpersonresponsibleforoperating,ensuringthemaintenanceofand,ifnecessary,developingthetransmissionsysteminagivenareaand,whereapplicable,itsinterconnectionswithotherpowersystems,andforensuringthelong-termabilityofthepowersystemtomeetreasonabledemandsforthetransmissionofelectricity

3.1.5

responsibleparty

party,thataccordingtothelegalframeworkisresponsibletodefinerequirementsorparametersaccordingtoCOMMISSIONREGLUALTION2016/631e.g.TSO,memberstate,regulatoryauthority

3.1.6

lowvoltage(LV)distributionnetwork

electricdistributionnetworkwithavoltagewhosenominalr.m.s.valueisUn≤1kV

3.1.7

mediumvoltage(MV)distributionnetwork

electricdistributionnetworkwithavoltagewhosenominalr.m.s.valueis1kV<Un≤36kV

Note1toentry:Becauseofexistingnetworkstructures,theupperboundaryofMVcanbedifferentinsomecountries.

3.1.8

powersystemstability

capabilityofapowersystemtoregainasteadystate,characterizedbythesynchronousoperationofthegeneratingplantsafteradisturbance

[SOURCE:IEV603-03-01]

3.1.9

producer

naturalorlegalpersonwhoalreadyhasconnectedorisplanningtoconnectanelectricitygeneratingplanttoadistributionnetwork

3.1.10

producer’snetwork

ACelectricalinstallationsdownstreamfromthepointofconnectionoperatedbytheproducerforinternaldistributionofelectricity

Note1toentry:Whentheinternaldistributionnetworkisidenticaltoanelectricalnetworkofacustomerhavinghisowngeneratingplant,whereoneormoregeneratingunitsareconnectedtothisinternaldistributionnetworkbehindapointofconnection,thenthisnetworkmaybealsoreferredasprosumer’snetwork.

3.1.11

downstream

directioninwhichtheactivepowerwouldflowifnoge