Amendment 1 - Photovoltaic power generating systems - EMC requirements and test methods for power conversion equipment

Amendement 1 - Systèmes de production d'énergie photovoltaïque - Exigences de CEM et méthodes d'essai pour les équipements de conversion de puissance

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Published
Publication Date
05-Apr-2021
Current Stage
PPUB - Publication issued
Completion Date
06-Apr-2021
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IEC 62920:2017/AMD1:2021 - Amendment 1 - Photovoltaic power generating systems - EMC requirements and test methods for power conversion equipment
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IEC 62920
Edition 1.0 2021-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Photovoltaic power generating systems – EMC requirements and test methods
for power conversion equipment
Systèmes de production d'énergie photovoltaïque – Exigences de CEM et
méthodes d'essai pour les équipements de conversion de puissance
IEC 62920:2017-07/AMD1:2021-04(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62920
Edition 1.0 2021-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Photovoltaic power generating systems – EMC requirements and test methods
for power conversion equipment
Systèmes de production d'énergie photovoltaïque – Exigences de CEM et
méthodes d'essai pour les équipements de conversion de puissance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.160 ISBN 978-2-8322-9595-3

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 62920:2017/AMD1:2021
© IEC 2021
FOREWORD

This amendment has been prepared by the IEC technical committee 82: Solar photovoltaic

energy systems.
The text of this amendment is based on the following documents:
FDIS Report on voting
82/1835/FDIS 82/1874/RVD

Full information on the voting for the approval of this amendment 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.

The committee has decided that the contents of this amendment and the base publication will

remain unchanged until the stability date indicated on the IEC website under

"http://webstore.iec.ch" in the data related to the specific publication. At this date, the

publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
INTRODUCTION
Replace the existing text of the Introduction with the following:
Background

Power conversion equipment (PCE) is indispensable for solar photovoltaic power energy

systems in order to convert the DC electric power energy generated by solar photovoltaic panels

into AC or DC electric power, and to feed the AC power energy into the AC mains network or

loads. PCE consists of DC to DC, DC to AC or AC to DC converters and forms systems with or

without DC-coupled electrical energy storage devices.

Manufacturers of PCE ensure the performance and reliability of PCE. Electromagnetic

compatibility (EMC) is one aspect of performance which must be ensured wherever PCE is used

in or exposed to an electromagnetic environment.

IEC Guide 107 specifies that TC 77 and CISPR, which are called EMC committees, have

responsibility for the development of basic, product family and generic standards on EMC

requirements, and product committees must use the emission limits developed by EMC

committees and must refer to basic immunity standards for the specification of test techniques.

---------------------- Page: 4 ----------------------
IEC 62920:2017/AMD1:2021 – 3 –
© IEC 2021
However, when the EMC standards which are developed by TC 77 and CISPR are not

considered suitable for a particular product or electromagnetic environment, product

committees must seek their assistance and advice for any change in the emission limits and/or

measurement requirements. Product committees are responsible for selecting the appropriate

immunity test items and levels for their products as well as for defining the relevant performance

criteria for the evaluation of the immunity test results. Consequently, product committees, such

as TC 22, TC 26, TC 9, and TC 69, have their own EMC standard to define EMC requirements

and test methods for their particular types of products.

TC 82 also has the responsibility to consider EMC requirements for PCE applying to the solar

photovoltaic power energy systems, and TC 82 has taken action as follows to develop its own

product EMC standards:

a) selection of the immunity test items in accordance with EMC environments for the solar

photovoltaic power energy systems,

b) supplement of generic standards with a detailed description of test conditions and test set

up,

c) development of the conditional limits and alternative test methods in terms of installation

environmental and operational conditions, and

d) development of appropriate requirements and test method for high power equipment.

In 2017, TC82 published IEC 62920 (Ed.1.0). By taking into account the latest market needs,

IEC 62920:2017 (Ed.1.0) has covered the above mentioned items and presents the minimum

EMC requirements for PCE applying to solar photovoltaic power energy systems.
Purpose of the maintenance of a product EMC standard

Following the state of the art technology as well as the latest market needs, users of standards

recognize the improvement of product EMC standards. The maintenance of product standards

is also one of important activities for product committees.

IEC 62920:2017 (Ed.1.0) is amended to extend the scope of IEC 62920:2017 (Ed.1.0) by taking

into account the following technical items.
– DC to DC power conversion equipment used in photovoltaic power energy systems.

– Electrical energy storage devices connected to DC power ports of PCE used in photovoltaic

power energy systems.

Furthermore, IEC 62920:2017 (Ed.1.0) is amended to cover the latest options of measurement

distance of radiated disturbances by taking the latest updates of CISPR 16-1-4 and CISPR 16-

2-3 into consideration to adapt it to different sizes of products.
1 Scope
Replace the existing first paragraph with the following:

This document specifies electromagnetic compatibility (EMC) requirements for power

conversion equipment (PCE) (e.g. DC to DC, DC to AC and AC to DC) for use in photovoltaic

(PV) power systems with or without DC-coupled electrical energy storage devices.
---------------------- Page: 5 ----------------------
– 4 – IEC 62920:2017/AMD1:2021
© IEC 2021
3 Terms and definitions
Replace the existing terms and definitions with the following:
3.1
photovoltaic power generating system
PV system

electric power generating system which uses the photovoltaic effect to convert solar power into

electricity
3.2
power conversion equipment
PCE

electrical device converting one form of electrical power to another form of electrical power with

respect to voltage, current, frequency, phase and the number of phases

[SOURCE: IEC 62109-1:2010, 3.66, modified – The definition has been rephrased, and the note

has been deleted.]
3.3
photovoltaic module
PV modules

complete and environmentally protected assembly of interconnected photovoltaic cells

[SOURCE: IEC TS 61836:2016, 3.1.48.7, modified – The note has been deleted.]
3.4
electrical energy storage devices
ESS

devices that are able to absorb electrical energy, to store it for a certain amount of time and to

release electrical energy during which energy conversion processes may be included

[SOURCE: IEC 62933-1:2018, 3.1, modified – The example and the note have been deleted.]

3.5
port
particular interface of the PCE with the external electromagnetic environment
Note 1 to entry: See Figure 1 for examples of ports.
Figure 1 – Example of ports
3.6
enclosure port

physical boundary of the PCE product which electromagnetic fields may radiate through or

impinge on
---------------------- Page: 6 ----------------------
IEC 62920:2017/AMD1:2021 – 5 –
© IEC 2021
3.7
AC mains power port

port used to connect to a public low voltage AC mains power distribution network or other low

voltage AC mains installation
3.8
auxiliary AC power port
additional low voltage AC power port for purposes other than feeding in AC power
3.9
DC power port

port used to connect a local low voltage DC power generating system or electrical energy

storage devices
3.10
auxiliary DC power port

additional low voltage DC power port for purposes other than supplying DC power for the DC

to AC conversion or electrical energy storage devices
3.11
signal and control port

port intended for the interconnection of components of PCE, or between PCE and local auxiliary

equipment, and used in accordance with relevant functional specifications

Note 1 to entry: Examples include RS-232, Universal Serial Bus (USB), high-definition multimedia interface (HDMI),

IEEE standard 1394 (“Fire Wire”) and control pilot.
3.12
wired network port

point to connection for voice, data and signalling transfers intended to interconnect widely

dispersed systems by direct connection to a single-user or multi-user communication network

Note 1 to entry: Examples include CATV, PSTN, ISDN, xDSL, LAN and similar networks. These ports can support

screened or unscreened cables and can also carry AC or DC power where this is an integral part of the

telecommunication specification.
3.13
high power electronic equipment and system

one or more power conversion equipment with a combined rated power greater than 75 kVA, or

a system containing such equipment
3.14
low voltage

set of voltage levels used for the distribution of electricity and whose upper limit is generally

accepted to be 1 000 V AC or 1 500 V DC
3.15
high voltage
a) in a general sense, the set of voltage levels in excess of low voltage

b) in a restrictive sense, the set of upper voltage levels used in power system for bulk

transmission of electricity
[SOURCE: IEC 60050-601:1985, 601-01-27]
---------------------- Page: 7 ----------------------
– 6 – IEC 62920:2017/AMD1:2021
© IEC 2021
3.16
medium voltage
any set of voltage levels lying between low and high voltage
[SOURCE: IEC 60050-601:1985, 601-01-28, modified – The note has been deleted.]
3.17
small equipment

equipment including its cables fits in an imaginary cylindrical test volume of 1,5 m in diameter

and 1,5 m in height (to ground plane) to be measured at a measurement distance of 3 m at an

OATS/SAC
3.18
medium equipment

equipment including its cables fits in an imaginary cylindrical test volume of 2 m in diameter

and 2 m in height (to ground plane) to be measured at a measurement distance of 5 m at an

OATS/SAC
3.19
type test

test of one or more equipment made to a certain design to show that the design meets certain

specifications
3.20
residential environment

environment characterized by the fact that the product is directly (not via external transformer)

connected to a public low voltage AC mains power distribution network or other low voltage AC

mains installation
3.21
non-residential environment

environment characterized by a separate power network, supplied from a dedicated power

transformer or a high- or medium-voltage transformer
3.22
PCE-MV
PCE including a medium voltage transformer
3.23
artificial mains network
AMN

network that provides a defined impedance to the equipment under test (EUT) at radio

frequencies, couples the disturbance voltage to the measuring receiver and decouples the test

circuit from the low voltage AC mains supply
3.24
artificial DC network
DC-AN

artificial network used for defined termination of the EUT’s port under test also providing the

necessary decoupling from conducted disturbances originating from the laboratory low voltage

DC power source
---------------------- Page: 8 ----------------------
IEC 62920:2017/AMD1:2021 – 7 –
© IEC 2021
4.1 Category of environment
Replace the existing Figure 2 with the following:
4.2 Division into classes
Add, at the end of the subclause, the following new note:

NOTE Such equipment would fulfil the tighter emission requirements of the residential environment as well as the

severe immunity requirements of the industrial environment.
5.1 General
Replace the existing text with the following:

Emission and immunity testing of PCE can be conducted with or without solar photovoltaic

modules or storage devices. However, only the PCE is subject to testing. Therefore, the test

may be conducted with a uni- or bi-directional appropriate DC power supply to simulate a PV

module and a storage device. The DC power supply shall provide a continuous and stable DC

voltage, load or power during testing. In addition, this alternative DC supply shall be designed

in such a manner that harmonics and electromagnetic disturbance from the DC supply do not

influence test results.

Similarly, a uni- or bi-directional appropriate AC power supply should be used so that continuous

and stable AC voltage and frequency for the PCE can be supplied during testing. Harmonics

and electromagnetic disturbance generated by the AC power source shall not influence test

results.

The uni- or bi-directional appropriate DC power supply and AC power supply are connected to

the DC power port and the AC mains power port. Auxiliary power ports, if any, and if necessary

to operate the PCE as intended, shall be connected to the appropriate power supply during

testing.
---------------------- Page: 9 ----------------------
– 8 – IEC 62920:2017/AMD1:2021
© IEC 2021

The uni- or bi-directional AC and/or DC power supply shall support all operating modes of PCE

to be tested.
5.2.1 General
Replace the existing fourth paragraph with the following:

The DC power ports of the PCE shall be connected to a suitable DC power supply. The DC

voltage of this power supply shall be adjustable to provide a voltage level within the rated

operation range for the respective type of PCE. A dedicated DC power source in the test

laboratories, sets of batteries or also other DC energy sources such as fuel cell modules can

be used, provided that they allow for continuous and stable voltage and current and other

conditions necessary for PCE within rated operating modes and conditions during testing.

Replace, in the existing fifth paragraph, "DC power sources" with "DC power supply".

Replace, in the existing sixth paragraph, both instances of “AC power source" with "AC power

supply".
Replace, in the existing seventh paragraph, "power sources" with "power supply".
5.2.4.1 Conducted disturbances
Replace the existing last paragraph with the following:

Measurement of conducted disturbances at signal and control ports shall be carried out

according to Table A.11 of CISPR 32:2015. Measurement arrangement is described in C.4.1.1

and Annex D of CISPR 32:2015. Asymmetric artificial networks or current probes shall be used

to measure asymmetric mode conducted emissions at the signal and control ports.
6.1 General
Replace the existing text with the following:
This document defines three operating modes for compliance testing, as follows.

Standby mode: The PCE is connected to the AC mains and is energized but does not generate

or feed power into the AC mains or electrical energy storage devices. The voltage level at the

DC power ports need not to be within the rated operation range.

Operating mode to feed into AC grid and/or to discharge from electrical energy storage devices:

The PCE shall operate at a rated operation point.

Operating mode to charge electrical storage device from PV modules and/or AC grid: The PCE

shall operate at a rated operation point.
6.2 Operating conditions for immunity requirement test
Replace the existing second paragraph to fifth paragraph with the following:

The electrostatic discharge immunity test shall be conducted under all the operating conditions

for the PCE in standby mode and operating modes. The PCE shall be continually operated at

its most sensitive operating point determined by preliminary testing.

The radiated radio-frequency electromagnetic field immunity test, electrical fast transient/burst

immunity test and surge immunity test shall be conducted in operating mode or modes.

---------------------- Page: 10 ----------------------
IEC 62920:2017/AMD1:2021 – 9 –
© IEC 2021

The surge test in addition shall be conducted in the standby mode with relays opened. In case

that relays are installed on AC and/or DC sides, a state with relays opened may be the worst

case for surge immunity because loads and/or sources are missing.

The immunity test to conducted disturbances induced by radio-frequency fields as well as

voltage dips and voltage interruption shall also be conducted in operating mode or modes.

During testing, it is recommended that the PCE is operated at the maximum power to feed into

AC mains and/or electrical energy storage devices. If the maximum feeding power is not

technically available due to the restriction of power capacity and DC voltage level of power

supply and test equipment in the laboratory, it may be necessary to conduct some investigatory

testing to adjust the feeding power of the PCE and DC voltage level at the DC power ports.

6.3 Operating conditions for low frequency emission requirement test
Replace the existing first paragraph with the following:

The low frequency emission test shall be carried out under the normal operating modes and

conditions determined by preliminary testing.

Replace, in the existing second paragraph, "operating mode" with "operating modes".

6.4 Operating conditions for high frequency emission requirement test

Add, after the existing note, the following new note 2, and renumber the existing note as note 1:

NOTE 2 DC to DC conversion also contributes to emission. This is especially the case for equipment with buck

and/or boost converters (e.g. optimizers and, ports for an electrical energy storage device). Any effect of the DC to

DC conversion function to emission can be tested only if activated.

Replace, in the existing second paragraph, "AC mains" with "AC mains or dis-/charging from/to

electrical energy storage devices".
7.1 Requirements
Replace the existing first paragraph with the following:

The immunity requirements in Table 1 shall be applied to class B PCE. The immunity

requirements in Table 2 shall be applied to class A PCE.
8.2.1.3 Disturbance voltage limits at the DC power port
Replace the existing text of this subclause with the following:

Limits for the disturbance voltage at the DC power port in the frequency range 150 kHz to 30

MHz for PCE measured on a test site are given in Table 8 and Table 9. Table 8 is for class A

PCE, and Table 9 for class B.

Limits for the disturbance voltage at the auxiliary DC power port are provided in Table 8 and

Table 9.

Selection of the appropriate set of limits at each auxiliary DC power port shall be based on the

rated power given in product specification.

In case of DC/DC converters component, the selection of the appropriate set of limits at each

DC power port shall be based on the rated power of PCE given in product specification.

The applicability of these limits is defined in Table 14.
---------------------- Page: 11 ----------------------
– 10 – IEC 62920:2017/AMD1:2021
© IEC 2021
Add the following new Table 14 after the existing Table 9:
Table 14 – Applicability of measurements at DC power ports
Cable length L Class B group 1 equipment Class A group 1 equipment
L < 3 m No measurements are required No measurements are required
For measurements, the limits in Table 9 For measurements, the limits in Table 8
apply. apply.

3 m ≤ L < 30 m The frequency range for measurement The frequency range for measurement

starts at a frequency equal to: starts at a frequency equal to:
f(MHz) = 60/ L f (MHz) = 60/ L
For measurements, the limits in Table 9 For measurements, the limits in Table 8
L ≥ 30 m
apply. apply.

L: maximum length of the installation cables (in metres) connected to an LV DC power port, and provided with

the product or as specified by the manufacturer. Where no maximum cable length is specified, L shall be

considered as longer than 30 m.
8.2.2 Radiated emission
Replace the existing Table 12 with the following:
Table 12 – Electromagnetic radiation disturbance limits for class A PCE
measured on a test site
b b
10 m measuring distance
5 m measuring distance 3 m measuring distance
rated power of
rated power of rated power of
Frequency
c c c c
a, c a, c
range ≤ 20 kVA ≤ 20 kVA ≤ 20 kVA > 20 kVA
> 20 kVA > 20 kVA
MHz
Quasi-peak Quasi-peak Quasi-peak Quasi-peak Quasi-peak Quasi-peak
dB(µV/m) dB(µV/m) dB(µV/m) dB(µV/m) dB(µV/m) dB(µV/m)
30 to 230 40 50 46 56 50 60
230 to 1 000 47 50 53 56 57 60

On a test site, class A equipment can be measured at a nominal distance of 3 m, 5 m, 10 m or 30 m. A measuring

distance less than 10 m (3 m or 5 m) is allowed only for small or medium equipment which complies with the

definition given in 3.17 or 3.18. In case of measurements at a separation distance of 30 m, an inverse

proportionality factor of 20 dB per decade shall be used to normalize the measured data to the specified distance

for determining compliance. Due to 20 lg(10/3) = 10,458 typically results in 10 dB offset between 10 m and 3 m

limits, a 6 dB offset is used between 10 m and 5 m limits based on 20 lg(10/5) = 6,021.

At the transition frequency, the more stringent limit shall apply.

These limits apply to equipment with a rated power of > 20 kVA and intended to be used at locations where

there is a distance greater than 30 m between the equipment and third party sensitive radio communications.

The manufacturer shall indicate in the technical documentation that this equipment is intended to be used at

locations where the separation distance to third party sensitive radio services is > 30 m. If these conditions are

not met, then the limits for ≤ 20 kVA apply.

The 3 m separation distance applies only to small equipment meeting the size criterion defined in 3.17. The

5 m separation distance applies only to medium equipment meeting the size criterion defined in 3.18.

Selection of the appropriate set of limits shall be based on the rated power.
---------------------- Page: 12 ----------------------
IEC 62920:2017/AMD1:2021 – 11 –
© IEC 2021
Replace the existing Table 13 with the following:
Table 13 – Electromagnetic radiation disturbance limits for class B PCE
measured on a test site
10 m measuring distance 3 m measuring
5 m measuring distance
distance
Frequency range
Quasi-peak Quasi-peak Quasi-peak
MHz
dB(µV/m) dB(µV/m) dB(µV/m)
30 to 230 30 36 40
230 to 1 000 37 43 47

On a test site, class B equipment can be measured at a nominal distance of 3 m, 5 m or 10 m. Due to 20 lg (10/3)

= 10,458 typically results in 10 dB offset between 10 m and 3 m limits, a 6 dB offset is used between 10 m and 5

m limits based on 20 lg (10/5) = 6,021.
At the transition frequency, the more stringent limit shall apply.

The 3 m separation distance applies only to small equipment meeting the size criterion defined in 3.17. The

5 m separation distance applies only to medium equipment meeting the size criterion defined in 3.18.

9 Test results and test report
Replace the existing title with the following:
9 Test procedures, results and report
Bibliography
Add the following documents:

IEC 60050-601:1985, International Electrotechnical Vocabulary (IEV) – Part 601: Generation,

transmission and distribution of electricity – General

IEC TS 61836:2016, Solar photovoltaic energy systems – Terms, definitions and symbols

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

General requirements
IEC 62933-1:2018, Electrical energy storage (EES) systems – Part 1: Vocabulary

IEC GUIDE 107, Electromagnetic compatibility – Guide to the drafting of electromagnetic

compatibility publications
IEEE 1394-2008, IEEE Standard for a High-Performance Serial Bus
___________
---------------------- Page: 13 ----------------------
– 12 – IEC 62920:2017/AMD1:2021
© IEC 2021
AVANT-PROPOS

Le présent amendement a été établi par le comité d’études 82 de l’IEC: Systèmes de conversion

photovoltaïque de l’énergie solaire.
Le texte de cet amendement est issu des documents suivants:
FDIS Rapport de vote
82/1835/FDIS 82/1874/RVD

Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant

abouti à l'approbation de cet amendement.
Le présent document a été rédigé selon les Directives ISO/IEC, Partie 2.

Le comité a décidé que le contenu de cet amendement et de la publication de base ne sera pas

modifié avant la date de stabilité indiquée sur le site web de l'IEC sous "http://webstore.iec.ch"

dans les données relatives à la publication recherchée. À cette date, la publication sera

• reconduite,
• supprimée,
• remplacée par une édition révisée, ou
• amendée.
_____________
INTRODUCTION
Remplacer le texte existant de l’Introduction par le suivant:
Informations générales
Les équipements de conversion de pui
...

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