EN 50549-2:2019

SLOVENSKI STANDARD
01-april-2019
Nadomešča:
SIST-TS CLC/TS 50549-2:2015
Zahteve za vzporedno vezavo generatorskih postrojev z razdelilnim omrežjem - 2.
del: Vezava s srednjenapetostnim razdelilnim omrežjem do vključno tipa B
Requirements for generating plants to be connected in parallel with distribution networks
- Part 2: Connection to a MV distribution network - Generating plants up to and including
Type B
Anforderungen für zum Parallelbetrieb mit einem Verteilnetz vorgesehene
Erzeugungsanlagen – Teil 2: Anschluss an das Mittelspannungsverteilnetz für
Erzeugungsanlagen bis einschließlich Typ B
Exigences relatives aux centrales électriques destinées à être raccordées en parallèle à
des réseaux de distribution - Partie 2: Raccordement à un réseau de distribution MT -
Centrales électriques jusqu’au Type B inclus
Ta slovenski standard je istoveten z: EN 50549-2:2019
ICS:
29.160.20 Generatorji Generators
29.240.01 Omrežja za prenos in Power transmission and
distribucijo električne energije distribution networks in
na splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50549-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2019
ICS 29.160.20 Supersedes CLC/TS 50549-2:2015
English Version
Requirements for generating plants to be connected in parallel
with distribution networks - Part 2: Connection to a MV
distribution network - Generating plants up to and including Type
B
Exigences relatives aux centrales électriques destinées à Anforderungen für zum Parallelbetrieb mit einem Verteilnetz
être raccordées en parallèle à des réseaux de distribution - vorgesehene Erzeugungsanlagen - Teil 2: Anschluss an
Partie 2: Raccordement à un réseau de distribution MT - das Mittelspannungsverteilnetz für Erzeugungsanlagen bis
Centrales électriques jusqu'au Type B inclus einschließlich Typ B
This European Standard was approved by CENELEC on 2018-08-09. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
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, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50549-2:2019 E
Contents Page
European foreword . 4
Introduction. 5
1 Scope . 7
2 Normative references . 8
3 Terms and definitions . 8
3.1 General . 8
3.2 Plant, module and unit . 10
3.3 Power . 12
3.4 Voltage . 13
3.5 Circuit theory . 15
3.6 Protection . 17
3.7 Control . 21
4 Requirements on generating plants . 23
4.1 General . 23
4.2 Connection scheme . 24
4.3 Choice of switchgear . 24
4.3.1 General . 24
4.3.2 Interface switch . 24
4.4 Normal operating range . 25
4.4.1 General . 25
4.4.2 Operating frequency range . 25
4.4.3 Minimal requirement for active power delivery at underfrequency . 25
4.4.4 Continuous operating voltage range . 26
4.5 Immunity to disturbances . 26
4.5.1 General . 26
4.5.2 Rate of change of frequency (ROCOF) immunity . 27
4.5.3 Under-voltage ride through (UVRT) . 27
4.5.4 Over-voltage ride through (OVRT) . 29
4.6 Active response to frequency deviation . 30
4.6.1 Power response to overfrequency . 30
4.6.2 Power response to underfrequency. 33
4.7 Power response to voltage changes . 36
4.7.1 General . 36
4.7.2 Voltage support by reactive power . 36
4.7.3 Voltage related active power reduction . 41
4.7.4 Short circuit current requirements on generating plants . 41
4.8 EMC and power quality . 46
4.9 Interface protection . 48
4.9.1 General . 48
4.9.2 Voltage transformer . 49
4.9.3 Requirements on voltage and frequency protection . 49
4.9.4 Means to detect island situation . 52
4.9.5 Digital input to the interface protection . 53
4.10 Connection and starting to generate electrical power. 53
4.10.1 General . 53
4.10.2 Automatic reconnection after tripping . 54
4.10.3 Starting to generate electrical power . 54
4.10.4 Synchronization . 54
4.11 Ceasing and reduction of active power on set point . 55
4.11.1 Ceasing active power . 55
4.11.2 Reduction of active power on set point . 55
4.12 Remote information exchange . 55
Annex A (informative)  Interconnection guidance . 56
A.1 General . 56
A.2 Network integration . 56
A.3 Clusters of single-phase generating units . 57
Annex B (informative) Remote information exchange . 58
Annex C (informative)  Parameter Table . 62
Annex D (informative) List of national requirements applicable for generating plants . 67
Annex E (informative) Loss of Mains and overall power system security . 69
Annex F (informative) Examples of protection strategies . 70
F.1 Introduction . 70
F.1.1 General . 70
F.1.2 Generalities . 70
F.1.3 Detection of unwanted islands . 70
F.1.4 Problems with uncontrolled islanding in MV networks . 71
F.1.4.1 Safety . 71
F.1.4.2 Grid parameters . 71
F.1.4.3 Reclosing operations . 71
F.1.4.4 Protection of islands against overcurrents . 71
F.1.4.5 Protection against phase to earth faults . 71
F.2 Example strategy 1 . 72
F.3 Example strategy 2 . 75
Annex G (normative) Abbreviations . 77
Annex H (informative) Relationship between this European standard and the
COMMISSION REGULATION (EU) 2016/631 . 78
Bibliography . 79

European foreword
This document (EN 50549-2:2019) has been prepared by CLC/TC 8X “System aspects of electrical
energy supply”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2019-08-01
implemented at national level by publication
of an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2022-02-01
conflicting with this document have to
be withdrawn
This document supersedes CLC/TS 50549-2:2015.
This European Standard relates to both the RfG European Network Code and current technical market
needs. Its purpose is to give detailed description of functions to be implemented in products.
This European Standard is also intended to serve as a technical reference for the definition of national
requirements where the RfG European Network Code requirements allow flexible implementation. The
specified 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 European
Standard (EN) with the evolution of the legal framework.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Introduction
1. Foreword
This Explanatory Note explains the rationale behind the content and structure of EN 50549-1 and EN
50549-2. Due to the unique relationship between COMMISSION REGULATION 2016/631 (RfG) and
the EN 50549 Series, and based on the comments received at the enquiry stage of FprEN 50549-1
and FprEN 50549-2, TC8X WG03 decided to draft this exp
...