It’s been a very long time coming, but the International Standards Organisation has finally published what is formally known as ISO 15118-20:2022/Amd 1:2026. According to the ISO web site the amendment adds the following improvements to the previously published 15118-20 standard:
AC DER service, MCS service, and improved security concept
If the acronyms above seem somewhat opaque and your internet address indicates that you are located in the United Kingdom you will see this not entirely helpful notice when you click the link above, :
Sadly the associated British standard is not yet available for purchase from the BSI web site! Instead we are told:
Approval start date: 17/04/2026
Publication start date: 06/08/2026
Fortunately in all the circumstances I don’t need to wait for the BSI to start selling the document, or pay ISO CHF 227 for the original 15118-20 standard plus another CHF 227 for the new amendment. As a member of the committee that developed the standards I already have PDF copies on my hard drive.
Quoting extracts from the brief sample of the amendment provided on the ISO web site:
3.73
megawatt charging system
MCS
charging system according to IEC61851-23-33.76
distributed energy resource
DER
source of electric power that is not directly connected to a bulk power system
EXAMPLE Generators and energy storage technologies capable of exporting active power to the electrical grid..3.78
frequency droop curve
parameterized curve of the frequency-watt function3.87
ride-through
ability to withstand voltage or frequency disturbances inside defined limits and to continue operating as specified
If you would like further insight into the implications of the above information, please do not hesitate to get in touch.