Safety of power converters for use in photovoltaic power systems - Part 3: Particular requirements for electronic devices in combination with photovoltaic elements

IEC 62109-3:2020 covers the particular safety requirements for electronic elements that are mechanically and/or electrically incorporated with photovoltaic (PV) modules or systems.
Mechanically and/or electrically incorporated means that the whole combination of electronic device with the photovoltaic element is sold as one product. Nevertheless, tests provided in this document may also be used to evaluate compatibility of PV modules and electronic devices that are sold separately and are intended to be installed close to each other.
The purpose of the requirements of this document is to provide additional safety-related testing requirements for the following types of integrated electronics, collectively referred to as module integrated equipment (MIE):
a) Type A MIE where the PV element can be evaluated as a PV module according to IEC 61730-1 and IEC 61730‑2 independently from the electronic element;
b) Type B MIE where the PV element cannot be evaluated as a PV module according to IEC 61730-1 and IEC 61730-2 independently from the electronic element.
The contents of the corrigendum of November 2020 have been included in this copy.

Sécurité des convertisseurs de puissance utilisés dans les systèmes photovoltaïques - Partie 3: Exigences particulières pour les dispositifs électroniques combinés aux éléments photovoltaïques

l’IEC 62109-3:2020 couvre les exigences particulières de sécurité concernant les éléments électroniques intégrés de manière mécanique et/ou électrique à des modules ou systèmes photovoltaïques (PV).
“Intégrés de manière mécanique et/ou électrique” signifie que l’intégralité de la combinaison de l’appareil électronique et de l’élément photovoltaïque est vendue comme un seul et même produit. Cependant, les essais indiqués dans le présent document peuvent également être utilisés pour évaluer la compatibilité des modules PV et des appareils électroniques vendus séparément et destinés à être installés à proximité les uns des autres.
Les exigences de la présente partie de l’IEC 62109 ont pour objet de fournir des exigences supplémentaires d’essai liées à la sécurité pour les types suivants d’électroniques intégrées, communément appelées “électroniques intégrées aux modules” (MIE-module integrated equipment):
a) La MIE de type A, dans laquelle l’élément PV peut être évalué comme un module PV conforme à l’IEC 61730-1 et à l’IEC 61730-2, quel que soit l’élément électronique;
b) La MIE de type B, dans laquelle l’élément PV ne peut pas être évalué comme un module PV conforme à l’IEC 61730-1 et à l’IEC 61730-2, quel que soit l’élément électronique.
Le contenu du corrigendum de novembre 2020 a été pris en considération dans cet exemplaire.

General Information

Status
Published
Publication Date
07-Jul-2020
Current Stage
PPUB - Publication issued
Completion Date
08-Jul-2020
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IEC 62109-3
Edition 1.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Safety of power converters for use in photovoltaic power systems –
Part 3: Particular requirements for electronic devices in combination with
photovoltaic elements
Sécurité des convertisseurs de puissance utilisés dans les systèmes
photovoltaïques –
Partie 3: Exigences particulières pour les dispositifs électroniques combinés
aux éléments photovoltaïques
IEC 62109-3:2020-07(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62109-3
Edition 1.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Safety of power converters for use in photovoltaic power systems –
Part 3: Particular requirements for electronic devices in combination with
photovoltaic elements
Sécurité des convertisseurs de puissance utilisés dans les systèmes
photovoltaïques –
Partie 3: Exigences particulières pour les dispositifs électroniques combinés
aux éléments photovoltaïques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.160 ISBN 978-2-8322-8483-4

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 62109-3:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 8

4 General testing requirements ........................................................................................... 9

4.1 General ................................................................................................................... 9

4.2 General conditions for testing ............................................................................... 16

4.2.1 Sequence of tests .......................................................................................... 16

4.2.2 Reference test conditions .............................................................................. 18

4.3 Thermal testing ..................................................................................................... 18

4.3.2 Maximum temperatures ................................................................................. 18

4.4 Testing in single fault condition ............................................................................. 23

4.4.4 Single fault conditions to be applied .............................................................. 23

4.8 Additional tests for grid-interactive inverters ......................................................... 23

4.300 General requirements regarding protection of the PV element circuit of MIE ......... 23

5 Marking and documentation ........................................................................................... 24

5.1 Marking ................................................................................................................. 24

5.1.1 General ......................................................................................................... 24

5.1.3 Identification .................................................................................................. 24

5.1.4 Equipment ratings .......................................................................................... 25

5.3 Documentation ...................................................................................................... 25

5.3.2 Information related to installation ................................................................... 25

6 Environmental requirements and conditions ................................................................... 25

7 Protection against electric shock and energy hazards .................................................... 25

8 Protection against mechanical hazards .......................................................................... 25

9 Protection against fire hazards ...................................................................................... 25

10 Protection against sonic pressure hazards ..................................................................... 26

11 Protection against liquid hazards ................................................................................... 26

12 Protection against chemical hazards .............................................................................. 26

13 Physical requirements ................................................................................................... 26

13.4 Internal wiring and connections ............................................................................. 26

13.4.5 Interconnection between parts of the PCE ..................................................... 26

13.9 Fault indication ..................................................................................................... 27

13.9.300 Fault indication for MIE .................................................................................. 27

13.300 Requirements for field assembled MIE .................................................................. 27

14 Components .................................................................................................................. 27

15 Software and firmware performing safety functions ........................................................ 27

Annex A (normative) Alternative method for PV module nominal backsheet

temperature (T ) .............................................................................................................. 28

NBs

A.1 General ................................................................................................................. 28

A.2 Principle ............................................................................................................... 28

A.3 Test procedure ...................................................................................................... 28

---------------------- Page: 4 ----------------------
IEC 62109-3:2020 © IEC 2020 – 3 –

Figure 300 – Test sequence .................................................................................................. 17

Figure 301 – Location of heating pads .................................................................................. 20

Figure 302 – Test setup for Type B MIE (cross-section view) ................................................ 22

Figure 303 – Test setup for Type A MIE (cross-section view) ................................................ 22

Table 300 – IEC 61730-2:2016 test reference for Type A and Type B MIE ............................ 11

---------------------- Page: 5 ----------------------
– 4 – IEC 62109-3:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF POWER CONVERTERS
FOR USE IN PHOTOVOLTAIC POWER SYSTEMS –
Part 3: Particular requirements for electronic devices
in combination with photovoltaic elements
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

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Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62109-3 has been prepared by IEC technical committee 82: Solar

photovoltaic energy systems.
The text of this International Standard is based on the following documents:
FDIS Report on voting
82/1718/FDIS 82/1737/RVD

Full information on the voting for the approval of this International Standard can be found in the

report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts of IEC 62109 series, under the general title, Safety of power converters for

use in photovoltaic power systems, can be found on the IEC website.
---------------------- Page: 6 ----------------------
IEC 62109-3:2020 © IEC 2020 – 5 –

The requirements in this document IEC 62109-3 are to be used with the requirements in

IEC 62109-1:2010 and IEC 62109-2:2011. This document IEC 62109-3 supplements or

modifies clauses in IEC 62109-1:2010 and IEC 62109-2:2011. When a particular clause or

subclause of IEC 62109-1:2010 or IEC 62109-2:2011 is not mentioned in this document

IEC 62109-3, that clause of IEC 62109-1:2010 and/or IEC 62109-2:2011 applies. When this

document IEC 62109-3 contains clauses that add to, modify, or replace clauses in IEC 62109-

1:2010 or IEC 62109-2:2011, the relevant text of IEC 62109-1:2010 and IEC 62109-2:2011 is

to be applied with the required changes.

Subclauses, figures and tables additional to those in IEC 62109-1:2010 and IEC 62109-2:2011

are numbered starting from 300 to indicate that they are introduced in this document

IEC 62109‑3.

NOTE For example, new level 2 subclauses in clause 5 would be numbered 5.300, 5.301, etc. New level 4

subclauses in subclause 7.3.201 would be numbered 7.3.201.300, 7.3.201.301, etc.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct understanding

of its contents. Users should therefore print this document using a colour printer.

---------------------- Page: 7 ----------------------
– 6 – IEC 62109-3:2020 © IEC 2020
INTRODUCTION

This part 3 of IEC 62109 gives requirements for products which consist of an electronic element

and a PV element or PV module. For this type of equipment, specific safety aspects must be

considered that arise from the combination of these two product types. This part 3 gives safety

requirements by: referring to other parts of IEC 62109 and to PV module standards like

IEC 61730, defining tests and requirements that are in addition to these product standards of

the sub elements, defining modifications to the test procedures in IEC 62109 and IEC 61730,

and providing guidance to apply these tests to the combination of PV module and electronics.

---------------------- Page: 8 ----------------------
IEC 62109-3:2020 © IEC 2020 – 7 –
SAFETY OF POWER CONVERTERS
FOR USE IN PHOTOVOLTAIC POWER SYSTEMS –
Part 3: Particular requirements for electronic devices
in combination with photovoltaic elements
1 Scope

This Part 3 of IEC 62109 covers the particular safety requirements for electronic elements that

are mechanically and/or electrically incorporated with photovoltaic (PV) modules or systems.

Mechanically and/or electrically incorporated means that the whole combination of electronic

device with the photovoltaic element is sold as one product. Nevertheless, tests provided in this

document may also be used to evaluate compatibility of PV modules and electronic devices that

are sold separately and are intended to be installed close to each other.
Items included in the scope:

Electronic devices combined with PV modules that perform functions such as, but not limited

to, DC-DC or DC-AC power conversion, active diodes, protection, control, monitoring, or

communication. These requirements specifically address such electronic devices used in

combination with flat-plate photovoltaic (PV) modules.

NOTE It is acknowledged that the physical design of products covered by this scope may vary widely, it is

anticipated that the requirements of this document may need to evolve to meet the unique safety requirements of

such products, particularly if the photovoltaic element of the product is not of a flat-plate configuration. As an

example, this document does not fully address the safety requirements of building-integrated photovoltaics (BIPV)

and building-attached photovoltaics (BAPV) products, although they would fall under the scope of this document.

The purpose of the requirements of this part of IEC 62109 is to provide additional safety-related

testing requirements for the following types of integrated electronics, collectively referred to as

module integrated equipment (MIE):
a) Type A MIE where the PV element can be evaluated as a PV module according to
IEC 61730-1 and IEC 61730-2 independently from the electronic element;

b) Type B MIE where the PV element cannot be evaluated as a PV module according to

IEC 61730-1 and IEC 61730-2 independently from the electronic element.
Items excluded from the scope:

PV modules with only one or more bypass diodes as the combined or integrated element. Such

products are covered by IEC 61730-1 and IEC 61730-2.
Aspects included and excluded from scope:

All aspects of IEC 62109-1:2010 apply. Addition to the list “excluded from the scope” is

evaluating the MIE to IEC 61215-1.
2 Normative references

Clause 2 of IEC 62109-1:2010 and IEC 62109-2:2011 is applicable with the following additions:

IEC 61215-2:2016, Terrestrial photovoltaic (PV) modules – Design qualification and type

approval – Part 2: Test procedures
---------------------- Page: 9 ----------------------
– 8 – IEC 62109-3:2020 © IEC 2020

IEC 61730-1:2016, Photovoltaic module safety qualification – Part 1: Requirements for

construction

IEC 61730-2:2016, Photovoltaic (PV) module safety qualification – Part 2: Requirements for

testing

IEC 61853-2:2016, Photovoltaic (PV) module performance testing and energy rating – Part 2:

Spectral responsivity, incidence angle and module operating temperature measurements

IEC 62109-1:2010, Safety of power converters for use in photovoltaic power systems – Part 1:

General requirements

IEC 62109-2:2011, Safety of power converters for use in photovoltaic power systems – Part 2:

Particular requirements for inverters

IEC 62790:2014, Junction boxes for photovoltaic modules – Safety requirements and tests

3 Terms and definitions

Clause 3of IEC 62109-1:2010 and IEC 62109-2:2011 is applicable with the following

modifications:
Modification:

In all cases where the term “PCE” is used in a definition in Clause 3 of IEC 62109-1:2010 or

IEC 62109-2:2011, it is replaced in this part with the term “MIE”, except for 3.66.

3.39
Isc PV
Modification:
Replace “array” with “PV element”.
3.58
Pluggable equipment type B
Modify Note:

Note 1 to entry: MIE PV AC and DC circuits that use connectors are considered pluggable equipment type B MIE

and may also be considered fixed equipment.
3.97
Vmax PV
Modification:
Replace “array” with “PV element”.
Additional subclauses:
3.300
module integrated equipment
MIE

minimally, the complete combination of photovoltaic elements, electronic devices, wiring with

connector(s), and mechanical mounting means

Note 1 to entry: This document uses two designations for MIE only for the purpose of describing test methods and

what tests apply: Type A MIE and Type B MIE. These type designations have no meaning outside of this document.

---------------------- Page: 10 ----------------------
IEC 62109-3:2020 © IEC 2020 – 9 –

Note 2 to entry: MIE with inverters as the electronic element are sometimes referred to as AC PV Modules. For the

purpose of this document, MIE is used to describe all combinations regardless of the type or function of the electronic

element.
3.301
type A MIE

construction where the PV module has been evaluated to IEC 61730-1 and IEC 61730-2

independently from the electronic element but may include any portion of the electronic element

that serves as an attachment means
3.302
type B MIE

construction where the PV element cannot be evaluated as a PV module to IEC 61730-1 and

IEC 61730-2 independently from the electronic element or portion of the electronic element

(such as the electronic attachment means)
3.303
PV element circuit
MIE PV circuit on the input side of the integrated electronics, including cables
3.304
diode

non-controllable valve device that allows the current to flow in one direction and blocking the

current in the reverse direction without any control signal being applied
3.305
active diode

circuit used to simulate a diode function using a switching element where the current is

controlled with a control signal
3.306
photovoltaic element
PV element
single PV cell, sub-assembly of such cells or entire PV module
4 General testing requirements

Clause 4 of IEC 62109-1:2010 and IEC 62109-2:2011 is applicable except as follows:

Addition:

NOTE In IEC 62109-1:2010 and therefore in this Part 3, test requirements that relate only to a single type of hazard

(shock, fire, etc.) are given in the clause specific to that hazard type. Test requirements that relate to more than one

type of hazard (for example testing under fault conditions) or that provide general test conditions, are given in this

Clause 4.
4.1 General
The following text replaces the requirements in IEC 62109-1:2010.

Testing required by this document is to demonstrate that electronic devices in combination with

photovoltaic elements are fully in accordance with the applicable requirements of this document.

This document requires the use of requirements from IEC 61730-2.

Guidance on modifications to the test procedures in IEC 61730-2:2016 is provided in Table 300.

---------------------- Page: 11 ----------------------
– 10 – IEC 62109-3:2020 © IEC 2020

Type A MIE may be tested to the condensed sequence of Figure 300 when the PV module has

already been evaluated to IEC 61730-2:2016 or newer. Designs that allow the electronic

element to be electrically and mechanically separated from the PV module without affecting the

outcome of the test can use samples consisting of just the electronic element for those tests

that do not require a full MIE. Tests for type B MIE may also be used for constructions where

the PV element can be separated and has not yet been evaluated as a PV module to
IEC 61730-2:2016 or newer independently from the electronic element.

Type B MIE will be evaluated to the test sequence of IEC 61730-2:2016, Figure 1 using

Table 300 as a guide for testing with the electronic element. Some modification to the test

procedure may be required along with special preparation of samples to gain access to PV

element output circuits and the electronics input and output circuits.

The evaluation of the electronic element shall also comply with all applicable clauses of this

document and any other IEC standards specific to the type of electronic device.

Some electronic devices and associated hardware require the use of other standards (such as

protection, monitoring, communication systems, cabling and connectors) for requirements

specific to the function of the device that are not included in:
a) this Part 3, or
b) IEC 62109-1:2010 and IEC 62109-2:2011.

This document does not supersede any requirements for PV modules in IEC 61730 (all parts)

and IEC 61215 (all parts).

Junction box designs that contain electronic elements can be evaluated as a component to

IEC 62790. However, the completed MIE assembly shall be evaluated to this document

considering tests and evaluations already performed to IEC 62790 that relate to requirements

in IEC 61730-1 and IEC 61730-2.

NOTE Table 300 and Figure 300 use abbreviations for module safety test (MST) and module quality test (MQT)

taken from IEC 61730-2:2016 and IEC 61215-2:2016.
---------------------- Page: 12 ----------------------
IEC 62109-3:2020 © IEC 2020 – 11 –
Table 300 – IEC 61730-2:2016 test reference for Type A and Type B MIE
Tests Type A MIE Type B MIE

IEC 61730-2:2016 Considerations when applying Figure 300 test Considerations when applying

NOTE
(IEC 61215-2:2016) IEC 61730-2:2016, Figure 1 test sequence
sequence.
NOTE
Environmental stress tests

MST 51 (MQT 11) Test using procedure MST 51 (MQT 11), In addition to the PV module test procedure in

Thermal cycling except: MST 51 (MQT 11), for MIE that is required to
be earthed and that provides earth continuity
a) The electronic element may be tested
between accessible metal parts and the
without a PV element if the electronic
earthing terminal, the earthing continuity shall
element is not secured by adhesive to
be monitored during the test. Connect a
the PV element and does not rely on any
continuous current source through the
part of the PV element for environmental
earthing path using the same procedure and
protection.
current as described for the PV module circuit
testing in MQT 11.
b) If the PV element has already been
evaluated, a constant current source
The electronic element is not powered during
does not have to be connected to the PV
this test.
element.
Post test(s) described in IEC 61730-2:2016,
c) Thermocouple(s) may be located on the
based on Figure 1 test sequence, shall be
electronic element if the PV element is
applied to the MIE using the considerations
not needed for the testing.
as described in Table 300 of this document.
d) For MIE that is required to be earthed
and that provide
...

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