Low-voltage electrical installations - Part 8-3 : Functional aspects - Operation of prosumer’s electrical installations

IEC TS 60364-8-3:2020 (E) specifies requirements and recommendations for the safe and proper functioning of prosumers' electrical installations.
It is intended for use by contractors, users, facility managers and similar of electrical low-voltage installations.
This document also provides requirements and recommendations on technical parameters and their limiting values influencing:
a) safety:
– protection;
– alarm;
b) proper functioning:
– stability (voltage, frequency, etc);
– reliability (power quality, interoperability of communication, etc);
– energy management (power, power factor, current, stored energy, etc);
– ability to ensure correct operation of equipment.
This document also provides requirements and recommendations on data exchange models, and test procedures for the prosumer’s electrical installations that could include the following applications:
– local generating sources (e.g. photovoltaic systems, rotating generators, wind turbines);
– energy storage units (e.g. stationary secondary batteries);
– electric vehicle charging and/or discharging;
– prosumer’s energy measurement unit (PEMU);
– control and monitoring system;
– loads which can be controlled.
This part of IEC 60364 is intended to be applied in conjunction with the other parts of IEC 60364.

General Information

Status
Published
Publication Date
26-May-2020
Current Stage
PPUB - Publication issued
Completion Date
27-May-2020
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IEC TS 60364-8-3
Edition 1.0 2020-05
TECHNICAL
SPECIFICATION
colour
inside
Low-voltage electrical installations –
Part 8-3: Functional aspects – Operation of prosumer’s electrical installations
IEC TS 60364-8-3:2020-05(en)
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IEC TS 60364-8-3
Edition 1.0 2020-05
TECHNICAL
SPECIFICATION
colour
inside
Low-voltage electrical installations –
Part 8-3: Functional aspects – Operation of prosumer’s electrical installations
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 91.140.50 ISBN 978-2-8322-8303-5

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC TS 60364-8-3:2020 © IEC 2020
CONTENTS

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

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

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

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

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

4 General ........................................................................................................................... 9

4.1 PEI architecture ...................................................................................................... 9

4.2 Operating modes .................................................................................................. 10

4.2.1 General ......................................................................................................... 10

4.2.2 Grid connected PEI........................................................................................ 10

4.2.3 Stand-alone PEI ............................................................................................ 10

4.2.4 Islandable PEI ............................................................................................... 11

5 Local power supplies ..................................................................................................... 11

5.1 General ................................................................................................................. 11

5.2 Renewable energy sources ................................................................................... 11

5.3 Electric vehicle charging system ........................................................................... 11

5.4 Electrical energy storage ...................................................................................... 12

6 Power measurement ...................................................................................................... 12

7 Control .......................................................................................................................... 13

7.1 General ................................................................................................................. 13

7.2 Grid connected PEI ............................................................................................... 13

7.3 Stand-alone PEI .................................................................................................... 13

7.4 Islandable PEI ...................................................................................................... 13

8 Monitoring ..................................................................................................................... 14

9 Optimization .................................................................................................................. 14

10 Communication .............................................................................................................. 15

10.1 General requirements ........................................................................................... 15

10.2 Information exchange within PEI ........................................................................... 15

10.3 Interaction between PEI and other systems........................................................... 16

10.3.1 General ......................................................................................................... 16

10.3.2 Specific functional constraints related to grid codes requirements ................. 16

10.3.3 Interaction with utilities or distribution system operator .................................. 17

10.3.4 Interactions with revenue metering systems ................................................... 17

10.3.5 Interactions with energy-related service providers (including energy

retailers) ........................................................................................................ 17

10.3.6 Peer to peer interactions with other prosumers or distributed energy

resources ...................................................................................................... 17

11 Power quality ................................................................................................................. 18

11.1 General ................................................................................................................. 18

11.2 Voltage regulation ................................................................................................. 18

11.3 Flicker ................................................................................................................... 18

11.4 Superimposed DC component ............................................................................... 18

11.5 Frequency ............................................................................................................. 18

11.6 Power factor ......................................................................................................... 18

12 Maintenance .................................................................................................................. 18

13 Test procedure .............................................................................................................. 19

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IEC TS 60364-8-3:2020 © IEC 2020 – 3 –

13.1 General ................................................................................................................. 19

13.2 Recommended tests ............................................................................................. 19

Annex A (informative) List of notes concerning certain countries .......................................... 20

Bibliography .......................................................................................................................... 21

Figure 1 – PEI architecture: functional layers .......................................................................... 9

Figure 2 – PEI architecture: example of physical layout ........................................................ 10

Table 1 – Examples of information exchange ........................................................................ 16

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– 4 – IEC TS 60364-8-3:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE ELECTRICAL INSTALLATIONS –
Part 8-3: Functional aspects –
Operation of prosumer’s electrical installations
FOREWORD

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

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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.

The main task of IEC technical committees is to prepare International Standards. In exceptional

circumstances, a technical committee may propose the publication of a Technical Specification

when

• the required support cannot be obtained for the publication of an International Standard,

despite repeated efforts, or

• the subject is still under technical development or where, for any other reason, there is the

future but no immediate possibility of an agreement on an International Standard.

Technical Specifications are subject to review within three years of publication to decide

whether they can be transformed into International Standards.

IEC TS 60364-8-3, which is a Technical Specification, has been prepared by IEC technical

committee 64: Electrical installations and protection against electric shock.
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IEC TS 60364-8-3:2020 © IEC 2020 – 5 –
The text of this Technical Specification is based on the following documents:
Draft TS Report on voting
64/2400/DTS 64/2427/RVDTS

Full information on the voting for the approval of this Technical Specification 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 in the IEC 60364 series, published under the general title Low-voltage electrical

installations, can be found on the IEC website.

The reader's attention is drawn to the fact that Annex A lists all of the "in-some-country" clauses

on differing practices of a less permanent nature relating to the subject of this document.

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

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– 6 – IEC TS 60364-8-3:2020 © IEC 2020
INTRODUCTION

There is a need for the development of new standards in smart grid that can apply to prosumers'

electrical installations in low-voltage level. New standards relating to prosumers' low-voltage

electrical installations that are different from existing facilities are needed in order to provide

bidirectional power and information while being connected to upper smart grid systems, unlike

other existing low-voltage electrical installations built in accordance with published standards,

and in order to evaluate the power quality of electrical power supply.

The new standards should be able to verify the stability, interoperability, security which are

characteristics of smart grid according to IEC TR 63097, published by IEC SyC Smart Energy.

When a bidirectional power network is operating, it is very important to ensure the safety of

homes and buildings and the protection of electrical installations in low-voltage against lightning

and fault.

A new standard for the verification of the prosumer’s electrical installations should in the first

instance define the power system of low-voltage and require criteria for information exchange

between the prosumer’s electrical installations while connecting to other power systems.

This document is the first attempt in the development of a framework for low-voltage electrical

installations. In order to match this overall framework, TC 64 made modifications to suit the

needs of the prosumer’s electrical installations in low-voltage, based on the framework and

architecture that have already been developed by IEC, IEEE and ETSI. Up till now, no attempt

to match the frame of other systems such as utilities, service providers, to other prosumers'

electrical installation systems has been made and this new development will help in setting-up

prosumers' electrical installations effectively.

As low-voltage to a prosumer’s electrical installation is applied, the biggest change is the mode

of the power supply. Direct feeding mode, reverse feeding mode and island mode are discussed

in IEC 60364-8-2. The reliability of the system operation mode is important for the stability,

safety, protection of the prosumer’s low-voltage electrical installations, depending on the mode

of the power supply.

In order to transfer the power consumption, failure and accident information to other systems

or other prosumers' electrical installations, it is important to ensure the interoperability of the

systems. This document defines the model of exchange information to facilitate the exchange

of data between systems, defines a framework to ensure interoperability, but does not define

how to secure communications for interoperability as communication type and methods.

In this document, a method of power supply and a data exchange model based on the framework

are suggested and the role of a prosumer who can directly produce and distribute energy is

defined.
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IEC TS 60364-8-3:2020 © IEC 2020 – 7 –
LOW-VOLTAGE ELECTRICAL INSTALLATIONS –
Part 8-3: Functional aspects –
Operation of prosumer’s electrical installations
1 Scope

This part of IEC 60364 specifies requirements and recommendations for the safe and proper

functioning of prosumers' electrical installations.

It is intended for use by contractors, users, facility managers and similar of electrical low-voltage

installations.

This document also provides requirements and recommendations on technical parameters and

their limiting values influencing:
a) safety:
– protection;
– alarm;
b) proper functioning:
– stability (voltage, frequency, etc);
– reliability (power quality, interoperability of communication, etc);
– energy management (power, power factor, current, stored energy, etc);
– ability to ensure correct operation of equipment.

This document also provides requirements and recommendations on data exchange models,

and test procedures for the prosumer’s electrical installations that could include the following

applications:

– local generating sources (e.g. photovoltaic systems, rotating generators, wind turbines);

– energy storage units (e.g. stationary secondary batteries);
– electric vehicle charging and/or discharging;
– prosumer’s energy measurement unit (PEMU);
– control and monitoring system;
– loads which can be controlled.

This part of IEC 60364 is intended to be applied in conjunction with the other parts of IEC 60364.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any

amendments) applies.

IEC 60364-8-1, Low-voltage electrical installation – Part 8-1: Functional aspects – Energy

efficiency
IEC 62053 (all parts), Electricity metering equipment
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– 8 – IEC TS 60364-8-3:2020 © IEC 2020
IEC TS 62786, Distributed energy resources connection with the grid
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
prosumer
entity or party who can be a producer and a consumer of electrical energy
[SOURCE: IEC60364-8-2:2018, 3.6]
3.2
prosumer’s electrical installation
PEI

electrical installation connected or not to a public distribution network able to operate:

– local power supplies, and/or
– local storage units

[SOURCE: IEC 60364-8-2:2018, 3.2, modified – Deletion of the second part of the definition.]

3.3
prosumer’s energy measurement unit
PEMU

equipment used for measuring the electrical energy used or produced by the PEI or part of it,

– to collect and analyse data for an efficient usage of the electricity, and
– to inform the control and monitoring system for management of the electricity
3.4
grid connected PEI

PEI connected to the distribution network, where local sources operate in parallel to the grid

Note 1 to entry: In case of power outage, the electrical installation cannot be supplied by the local supplies.

3.5
stand-alone PEI

PEI designed for being never connected to a distribution network, supplied by its own local

sources only
3.6
islandable PEI

PEI connected to the distribution network, able to operate in island mode in case of distribution

network outage
3.7
operating mode

operation of an installation with respect to the different sources of electrical energy and to

energy flow
[SOURCE: IEC 60364-8-2:2018, 3.11]
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IEC TS 60364-8-3:2020 © IEC 2020 – 9 –
3.8
electrical energy storage
EES

system for storing and releasing electrical energy based on the needs of the connected

installation
4 General
4.1 PEI architecture

As shown in Figure 1, it can be considered that PEI architecture is composed of the following

layers:

• protection and metering: equipment and devices in the installation for the purpose of safety,

reliability, power and energy management;

• power supplies: includes the connection to the distribution network and local power supplies

such as PV system, wind turbines, electrical energy storage;
• control system to ensure the proper functioning of the PEI;
• monitoring system;
• analytics and services for optimization of the power supplies usage.
Figure 1 – PEI architecture: functional layers
An example of physical PEI architecture is presented in Figure 2.
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– 10 – IEC TS 60364-8-3:2020 © IEC 2020
Key
EES: electrical energy system
CHP: combined heat and Power
POC: point of connection
UPS: uninterruptible power supply
Figure 2 – PEI architecture: example of physical layout
4.2 Operating modes
4.2.1 General

Each operating mode is a unique configuration of local energy supplies, supplied loads, EES

and electric vehicle charging or discharging state.
4.2.2 Grid connected PEI
The operating modes in a grid-connected PEI are as follows:
• the PEI is supplied by the distribution network;

• the PEI is supplied by the distribution network and local energy supplies. The EES operates

as load or as energy supply. Each operating mode is defined by the available local energy

sources and supplied loads.
4.2.3 Stand-alone PEI

A stand-alone PEI is energized by local power supplies without any supply from the grid. The

voltage and the frequency reference are fixed by one of the local power supplies.

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IEC TS 60364-8-3:2020 © IEC 2020 – 11 –
4.2.4 Islandable PEI
The operating modes in an islandable PEI are as follows:
• the PEI is supplied by the distribution network;
• the PEI is supplied by the distribution network and local power supplies;
• the PEI is supplied by local power supplies only.
5 Local power supplies
5.1 General
Local power supplies may include:
• energy sources (e.g. PV, wind turbines),
• electrical energy storage (EES) units,
• electric vehicle charging stations (EVCSs).

When required, the local power supplies shall be erected in such a way that it should be able

to disconnect from the installation, in accordance with the requirements of the distribution

system operator (DSO).
5.2 Renewable energy sources

Energy sources may include PV inverters, wind turbine inverters or co-generation units.

Renewable energy sources shall correctly transfer information to the control and monitoring

system on power measurements and inverter status. They shall be able to receive set points

for operation or control orders from the control system.

Renewable energy sources may be temporarily, automatically disconnected from the PEI in

order to avoid damage resulting from voltage fluctuation.
5.3 Electric vehicle charging system

The electric vehicle charging station shall correctly transfer the following information to the

control and monitoring of the PEI, if relevant:
• verification of the correct connection of the electric vehicle to the PEI;
• activation or not of the charge or the discharge of the electric vehicle;

• setting of charging and/or discharging rate and charging and/or discharging time;

• keeping and releasing connection of the charging interface equipment;
• user recognition;
• measurement or calculation of used energy;
• calculation and payment of charge or discharge;
• charging status of the electric vehicle.

Minimum specifications of the electric vehicle shall be transferred as follows to ensure safety

and interoperability of the PEI out of information required for the control and operation of the

electric vehicle charging equipment:

• specification of the electric vehicle for detection and adjustment of allowable load current of

the power supply equipment;

• specification for measurement or calculation of used energy of the electric vehicle;

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– 12 – IEC TS 60364-8-3:2020 © IEC 2020

• continuous detection and adjustment of allowable load current of the power supply

equipment.

The control system can start, stop the charging or the discharging, if relevant, of the electric

vehicle according to power supply status and user commands.

When the PEI is operated in island mode, it is required to control whether or not the electric

vehicles can be charged or discharged considering availability of the electrical power from the

local power supplies of the PEI.
5.4 Electrical energy storage

Electrical energy storage (EES) units shall complement unstable output of the distributed

generation or be used as a main local power.

EES shall provide instantaneously any power fluctuation occurring from the difference between

power generation and current-using equipment consumption in the island mode.

• Local power generation and local power consumption shall be measured and compared.

• The control system shall analyse the above information to control the power generation and

the local consumption.

In case of sudden disconnection of the PEI from the public distribution network, the PEI shall

instantaneously change from the connected mode to the island mode. In this case the EES shall

complement the distributed power supplies for supplying the current-using equipment.

When connected to the public distribution network and using the reverse feeding mode, the

control system shall manage output power and current-using equipment consumption and

power feedback to the public distribution network to improve power quality and supply stable

power.

After supplying power to the current-using equipment from a distributed generation in the local

system, the surplus power shall be stored in the EES unit, or the power supplied from the system

shall be stored in the EES unit for demand management and preparation for a situation of power

supply in an island mode.
6 Power measurement

Power measurement equipment shall provide current, voltage, power, frequency and power

quality information.

Power measurement equipment shall measure power usage in a certain time interval.

Power measurement equipment shall integrate a remote measurement function.

Power measurement equipment shall provide information on power generation and load

consumption to the control, monitoring and optimization systems.

Accuracy of the measuring instrument allows correct information for PEI operation. Accuracy of

the measuring equipment shall have the relevant class according to IEC 62053 (all parts) so as

to allow correct PEI operation.

The smart meter and measuring equipment shall be installed on such locations that allow

information required for each equipment according to conditions
...

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