CLC/TS 50549-1:2015

Requirements for generating plants to be connected in parallel with distribution networks - Part 1: Connection to a LV distribution network above 16 A

The purpose of this Technical Specification is to provide technical guidance on the requirements for generating plants which can be operated in parallel with a distribution network. For practical reasons, this Technical Specification refers to the distribution system operator in case settings have to be defined and/or provided, even when these settings are to be defined and/or provided by another actor according to national and European legal framework. NOTE 1 This includes European network codes and their national implementation, as well as further national regulations. NOTE 2 Further national requirements especially for the connection to the distribution network and the operation of the generating plant can apply. The requirements of this Technical Specification apply to all generating plants, electrical machinery and electronic equipment, irrespective of the kind of primary energy source and irrespective of the presence of loads in the producer’s network that meet all of the following conditions: - converting any primary energy source into AC electricity; - connected to a LV distribution network and rated at more than 16 A per phase; - intended to operate in parallel with this distribution network under normal network operating conditions. NOTE 3 Generating plants rated up to and including 16 A per phase are covered by EN 50438. NOTE 4 Generating plants connected to a MV distribution network fall into the scope of CLC/TS 50549-2. Unless stated differently by the DSO generating plants connected to a medium voltage distribution network with a maximum apparent power up to 100 kVA can comply with this Technical Specification as alternative to the requirements of CLC/TS 50549-2. A different threshold may be defined by the DSO. This Technical Specification defines connection requirements. This Technical Specification recognizes the existence of National Standards, Network Codes, and specific technical requirements of the DSOs. These should be complied with. Excluded from the scope are: - the selection and evaluation of the point of connection; - power system impact assessment; - connection assessment; - island operation of generating plants, both intentional and unintentional, where no part of the distribution network is involved; - active front ends of drives feeding energy back into the distribution network for short duration; - requirements for the safety of personnel as they are already adequately covered by existing European Standards.

Anforderungen für zum Parallelbetrieb mit einem Verteilnetz vorgesehene Erzeugungsanlagen – Teil 1: Anschluss an das Niederspannungsverteilnetz über 16 A je Phase

Diese Technische Spezifikation legt die technischen Anforderungen für den Anschluss von Erzeugungsan-lagen fest, die parallel mit einem öffentlichen Verteilungsnetz betrieben werden können. Diese Technischen Spezifikation soll als Referenz in einer Anschlussgenehmigung herangezogen werden, die zwischen einem VNB und einem Erzeuger getroffen wird. Die Anforderungen dieser Technischen Spezifikation beschränken sich auf den elektrischen Teil der Anlage, unabhängig von der verwendeten Primärenergiequelle. Diese Technischen Spezifikation gilt für alle dreiphasigen Erzeugungseinheiten, welche die folgenden Bedin-gungen – entweder als Einzelanlage oder als Gruppe von mehreren Anlagen mit einem gemeinsamen An-schlusspunkt – erfüllen: • Umwandlung einer beliebigen Primärenergie in Wechselstrom; • Bemessungsströme größer 16 A je Phase und Anschluss an ein Niederspannungsnetz; • Anlagen, die unter normalen Netzbetriebsbedingungen ständig parallel mit einem öffentlichen Ver-teilungs¬netz betrieben werden sollen; ANMERKUNG Erzeugungsanlagen bis 16 A je Phase werden durch die EN 50438 abgedeckt. Diese Technischen Spezifikation legt die Anschlussbedingungen und ein Verfahren für die Konformitäts¬prü-fung fest. Der Inselnetzbetrieb von Erzeugungsanlagen – beabsichtigt oder unbeabsichtigt – bei dem kein Teil des öffentlichen Verteilungsnetzes betroffen ist, liegt nicht im Anwendungsbereich dieser Technischen Spezifika-tion. Die Personensicherheit liegt nicht im Anwendungsbereich dieser Technischen Spezifikation. Diese Norm anerkennt die Existenz von nationalen Normen und Grid Codes: diese müssen eingehalten wer-den. Nur wenn keine nationalen Normen und Grid Codes vorhanden sind, sollen die Anforderungen dieser Technischen Spezifikation zur Anwendung kommen.

Prescriptions relatives au raccordement de générateurs de plus de 16A par phase - Partie 1: Connexion au réseau de distribution BT

L'objet de la présente Spécification Technique est de fournir des instructions techniques pour le raccordement des centrales de production pouvant fonctionner en parallèle avec un réseau de distribution public. La présente Spécification Technique est destinée à être utilisée comme référence technique dans les contrats de raccordement entre les GRD et les producteurs d'électricité. Les exigences contenues dans la présente Spécification Technique s'appliquent uniquement aux machines et au matériel, quelle que soit la source d'énergie primaire. La présente Spécification Technique s'applique à toutes les unités de production triphasées qui satisfont à toutes les conditions qui suivent en tant qu'unité de production individuelle ou en tant que groupe d'unités de production ayant un point de raccordement commun: • convertissant toute source d'énergie primaire en électricité en courant alternatif; • est raccordé(e) au réseau BT et assigné(e) à plus de 16 A par phase; • est destiné(e) à fonctionner en parallèle avec un réseau de distribution public dans des conditions de fonctionnement normales. NOTE Les générateurs assignés à 16 A inclus par phase sont couverts par la norme EN 50438. La présente Spécification Technique définit les exigences applicables aux interconnexions ainsi qu'une procédure d'essai de conformité. Le fonctionnement en îlotage de centrales de production, qu'il soit intentionnel ou non, dans lequel aucune partie du système de distribution public n'est impliquée, est en dehors du domaine d'application de la présente Spécification Technique. La sécurité du personnel est en dehors du domaine d'application de la présente Spécification Technique. La présente Spécification Technique reconnaît l'existence de normes et de codes nationaux applicables aux réseaux: ceux-ci doivent être respectés. Il convient que les exigences de la présente Spécification Technique s'appliquent uniquement en l'absence de ces normes et codes nationaux.

Zahteve za priklop generatorjev za toke nad 16 A na fazo – 1. del: Priklop na nizkonapetostni distribucijski sistem

Namen te tehnične specifikacije je zagotoviti tehnična navodila o zahtevah za generatorje, ki jih je mogoče upravljati hkrati z razdelilnim omrežjem.
Zaradi praktičnih razlogov se ta tehnična specifikacija nanaša na upravljavca razdelilnega omrežja,
kadar je treba nastavitve opredeliti in/ali zagotoviti, tudi kadar mora te nastavitve opredeliti in/ali zagotoviti drug udeleženec v skladu z nacionalnim in evropskim pravnim okvirom.
OPOMBA 1: To zajema evropske omrežne kodekse in njihovo nacionalno izvajanje ter tudi dodatne nacionalne predpise.
OPOMBA 2: Uporabiti je mogoče dodatne nacionalne zahteve, zlasti za povezavo z razdelilnim omrežjem in delovanjem generatorja.
Zahteve iz tega tehničnega standarda se uporabljajo za vse generatorje, električne stroje in elektronsko opremo, ne glede na vrsto vira primarne energije in ne glede na prisotnost obremenitev v omrežju proizvajalca, ki izpolnjujejo naslednje pogoje:
– pretvarjanje katerega koli vira primarne energije v izmenični tok;
– povezava z nizkonapetnostnim razdelilnim omrežjem z nazivno vrednostjo več kot 16 A na fazo;
– namenjeni so za uporabo skupaj s tem razdelilnim omrežjem v običajnih pogojih delovanja
omrežja.
OPOMBA 3: Generatorji z nazivno vrednostjo do vključno 16 A na fazo so zajeti v standardu EN 50438.
OPOMBA 4: Generatorji, povezani s srednjenapetostnim omrežjem, so zajeti v področju uporabe standarda CLC/TS 50549-2.
Razen če upravljavec razdelilnega omrežja navede drugače, je mogoče, da so generatorji, povezani v srednjenapetostno razdelilno
omrežje z največjo navidezno močjo do 100 kVA, skladni s to tehnično specifikacijo kot alternativo zahtevam iz CLC/TS 50549-2. Upravljavec razdelilnega omrežja lahko opredeli drugačen prag.
Ta tehnična specifikacija določa zahteve za priključitev.
V tej tehnični specifikaciji se upošteva obstoj nacionalnih standardov, omrežnih kodeksov in
posebnih tehničnih zahtev upravljavcev razdelilnih omrežij. Te zahteve naj bi se upoštevale.
Ta standard ne zajema:
– izbire in ocene točke povezave;
– ocene učinka napajalnega sistema;
– ocene povezave;
– ločenega delovanja generatorjev, namernega in nenamernega, kadar ni vključen noben del
razdelilnega omrežja;
– aktivnih sprednjih delov pogonov, ki energijo za kratek čas usmerjajo nazaj v razdelilno omrežje;
– zahtev za varnost osebja, ker so že ustrezno zajete v veljavnih evropskih standardih.

General Information

• Status: Withdrawn
• Publication Date: 15-Jan-2015
• ICS: 29.160.20 - Generators
• Technical Committee: CLC/TC 8X - System aspects of electrical energy supply
• Drafting Committee: IEC/TC 8 - IEC_TC_8
• Parallel Committee: IEC/TC 8 - IEC_TC_8
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 01-Feb-2022
• Completion Date: 01-Feb-2022
• Mandate: M/490 - Standardisation mandate to the European Standardisation Organisations (ESOs) to support European Smart Grid deployment
• Ref Project: SIST-TS CLC/TS 50549-1:2015 - Requirements for the connection of generators above 16 A per phase - Part 1: Connection to the LV distribution system

Relations

• Replaced By: EN 50549-1:2019 - Requirements for generating plants to be connected in parallel with distribution networks - Part 1: Connection to a LV distribution network - Generating plants up to and including Type B
• Effective Date: 23-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2015
Zahteve za priklop generatorjev za toke nad 16 A na fazo – 1. del: Priklop na
nizkonapetostni distribucijski sistem
Requirements for the connection of generators above 16 A per phase - Part 1:
Connection to the LV distribution system
Prescriptions pour le raccordement de générateurs de plus de 16A par phase - Partie 1:
Connexion au réseau de distribution BT
Ta slovenski standard je istoveten z: CLC/TS 50549-1:2015
ICS:
29.160.20 Generatorji Generators
29.240.01 2PUHåMD]DSUHQRVLQ Power transmission and
GLVWULEXFLMRHOHNWULþQHHQHUJLMH distribution networks in
QDVSORãQR general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION CLC/TS 50549-1

SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
January 2015
ICS 29.160.20
English Version
Requirements for generating plants to be connected in parallel
with distribution networks - Part 1: Connection to a LV
distribution network above 16 A
Prescriptions relatives au raccordement de générateurs de Anforderungen für den Anschluss von
plus de 16A par phase - Partie 1: Connexion au réseau de Stromerzeugungsanlagen über 16 A je Phase - Teil 1:
distribution BT Anschluss an das Mittelspannungsverteilungsnetz
This Technical Specification was approved by CENELEC on 2014-09-15.

CENELEC members are required to announce the existence of this TS in the same way as for an EN and to make the TS available promptly
at national level in an appropriate form. It is permissible to keep conflicting national standards in force.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. CLC/TS 50549-1:2015 E

Contents Page
Foreword.3
1 Scope .4
2 Normative references .4
3 Terms and definitions .5
4 Requirements on generating plants . 13
4.1 General . 13
4.2 Connection scheme . 14
4.3 Choice of switchgear . 14
4.4 Normal operating range . 15
4.5 Immunity to disturbances . 17
4.6 Active response to frequency deviation . 19
4.7 Power response to voltage variations and voltage changes . 20
4.8 EMC and power quality . 25
4.9 Interface protection . 25
4.10 Connection and starting to generate electrical power . 30
4.11 Active power reduction on set point . 31
4.12 Requirements regarding single fault tolerance of interface protection system and
interface switch . 31
5 Conformance test procedure . 31
Annex A (informative)  Interconnection requirements . 32
A.1 General . 32
A.2 Network integration . 32
A.3 Clusters of single-phase generating units . 33
Annex B (informative) Loss of Mains and overall power system security . 34
Annex C (informative) Examples of protection strategies . 35
C.1 Introduction . 35
C.2 Example strategy 1 . 36
C.3 Example strategy 2 . 40
Annex D (normative) Abbreviations . 42
Bibliography . 43

- 3 - CLC/TS 50549-1:2015
Foreword
This document (CLC/TS 50549-1:2015) has been prepared by CLC/TC 8X "System aspects of
electrical energy supply".
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
This Technical Specification relates to both future European Network Codes and current technical
market needs. Its purpose is to give detailed description of functions to be implemented in products.
This Technical Specification is also intended to serve as a technical reference for the definition of
national requirements where European Network Codes requirements allow flexible implementation.
The stated requirements are solely technical requirements; economic issues regarding, e.g. the
bearing of cost are not in the scope of this document.
CLC/TC 8X plans future standardization work in order to ensure the compatibility of this Technical
Specification with the evolution of the legal framework.

1 Scope
The purpose of this Technical Specification is to provide technical guidance on the requirements for
generating plants which can be operated in parallel with a distribution network.
For practical reasons, this Technical Specification refers to the distribution system operator in case
settings have to be defined and/or provided, even when these settings are to be defined and/or
provided by another actor according to national and European legal framework.
NOTE 1 This includes European network codes and their national implementation, as well as further national
regulations.
NOTE 2 Further national requirements especially for the connection to the distribution network and the
operation of the generating plant can apply.
The requirements of this Technical Specification apply to all generating plants, electrical machinery
and electronic equipment, irrespective of the kind of primary energy source and irrespective of the
presence of loads in the producer’s network that meet all of the following conditions:
– converting any primary energy source into AC electricity;
– connected to a LV distribution network and rated at more than 16 A per phase;
– intended to operate in parallel with this distribution network under normal network operating
conditions.
NOTE 3 Generating plants rated up to and including 16 A per phase are covered by EN 50438.
NOTE 4 Generating plants connected to a MV distribution network fall into the scope of CLC/TS 50549-2.
Unless stated differently by the DSO generating plants connected to a medium voltage distribution
network with a maximum apparent power up to 100 kVA can comply with this Technical Specification
as alternative to the requirements of CLC/TS 50549-2. A different threshold may be defined by the
DSO.
This Technical Specification defines connection requirements.
This Technical Specification recognizes the existence of National Standards, Network Codes, and
specific technical requirements of the DSOs. These should be complied with.
Excluded from the scope are:
– the selection and evaluation of the point of connection;
– power system impact assessment;
– connection assessment;
– island operation of generating plants, both intentional and unintentional, where no part of the
distribution network is involved;
– active front ends of drives feeding energy back into the distribution network for short duration;
– requirements for the safety of personnel as they are already adequately covered by existing
European Standards.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 60255-127, Measuring relays and protection equipment  Part 127: Functional requirements for
over/under voltage protection (IEC 60255-127)
EN 61000-4-30, Electromagnetic compatibility (EMC)  Part 4-30: Testing and measurement
techniques  Power quality measurement methods (IEC 61000-4-30)

- 5 - CLC/TS 50549-1:2015
 Part 1: Fundamental principles, assessment of
HD 60364-1, Low-voltage electrical installations
general characteristics, definitions (IEC 60364-1)
HD 60364-5-551, Low-voltage electrical installations  Part 5-55: Selection and erection of electrical
equipment  Other equipment  Clause 551: Low-voltage generating sets (IEC 60364-5-551)
IEC 60050, International Electrotechnical Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050 and the following
apply.
3.1
active factor
for a two-terminal element or a two-terminal circuit under sinusoidal conditions, ratio of the active
power to the apparent power
Note 1 to entry:  In a three phase system, this is referring to the positive sequence component of the
fundamental.
Note 2 to entry:  The active factor is equal to the cosine of the displacement angle.
[SOURCE: IEV 131-11-48, modified]
3.2
basic insulation
insulation of hazardous-live-parts which provides basic protection
Note 1 to entry:  This concept does not apply to insulation used exclusively for functional purposes.
[SOURCE: IEV 195-06-06]
3.3
basic protection
protection against electric shock under fault-free conditions
[SOURCE: IEV 195-06-01]
3.4
cogeneration
combined heat and power (CHP)
combined generation of electricity and heat by an energy conversion system and the concurrent use of
the electric and thermal energy from the conversion system
3.5
converter connected generating technology
technology where a generating unit is connected to a distribution grid through a converter including
doubly fed induction machine based technology (DFIG)
3.6
design active power
P
D
maximum AC active power output at an active factor of 0,9 or the active factor specified by the DSO
for a certain generating plant or generating technology
3.7
directly coupled generating technology
technology where a generating unit is connected to a distribution grid without any converter
3.8
disconnection
separation of the active parts of the main circuit of the generating plant or unit from the network with
mechanical contacts providing at least the equivalent of basic insulation

Note 1 to entry:  Passive components like filters, auxiliary power supply to the generating unit and sense lines
can remain connected.
Note 2 to entry:  For the design of basic insulation all voltage sources should be considered.
3.9
displacement angle
φ
under sinusoidal conditions, phase difference between the voltage applied to a linear two-terminal
element or two-terminal circuit and the electric current in the element or circuit
Note 1 to entry:  In a three phase system, this is referring to the positive sequence component of the
fundamental.
Note 2 to entry:  The cosine of the displacement angle is the active factor.
3.10
distribution network
electrical network, including closed distribution networks, for the distribution of electrical power from
and to third parties connected to it, to and from a transmission or another distribution network, for
which a DSO is responsible
3.11
distribution system operator
DSO
natural or legal person responsible for the distribution of electrical power to the public and for
operating, ensuring the maintenance of and, if necessary, developing the distribution network in a
given area
No
...