The National HVDC CentreUse of HVDC and Large-scale Power Electronics to address Frequency stabilityBen Marshall, Technology Manager, National HVDC Centre,GBMulti-DC: 23/09/21

Page: 2

222/09/2021

Page: 3

322/09/2021

Agenda

1) What is GB frequency stability, and what influences that?

2) HVDC and large- scale Power electronics- how have they been used to support frequency stability?

3) HVDC and large –scale Power electronics in the Future

4) Future risks, Opportunities and areas of R&D priority

5) Managing Interoperability.

Page: 4

Frequency Stability in GB:

Minimising frequency “drift”

Responding to frequency movement

(Frequency moves differently across

the system during an event)

Damping frequency

following an event

Containing frequency movement

(avoiding cascade loss)

https://www.nationalgrideso.com/document/63481/download

Key ingredients today

System inertiaFrequency regulation

Static and dynamic responses

https://www.nationalgrideso.com/document/144441/download

http://powerresponsive.com/wp-content/uploads/2021/01/PR-Steering-Group-Slides-21st-January-2021.pdf

Page: 5

How HVDC & Power Electronics used today:

Services in development by NGESO

Services in use by NGESO

Technologies and their capabilities over time…

https://www.nationalgrideso.com/document/188666/download

https://www.nationalgrideso.com/document/188666/download

Page: 6

622/09/2021

The future…

1) NOA stability Pathfinders – GB Grid Forming Converters.

2) Offshore co-ordination- multi-purpose HVDC arrangements, with Grid forming resources and properties.

3) Wide Area enabled/ informed frequency support- follow-ons from EFCC

Page: 7

722/09/2021

Risks and opportunities..

1) Guarding across new vulnerabilitiescontrol interaction, ride-through, new areas of compliance demonstration and data exchange.

2) “Last Man standing” challengesmonitoring integration of Grid forming resources & resilience of residual synchronous technology- PMU monitoring; phase step responses Offshore co-ordination- multi-purpose HVDC arrangements, with Grid forming resources and properties.

3) Delivering interoperability across more complex Power Electronic concepts with new more extensive performance needs, at scale & at pace!

Page: 8

Hosted simulation Environments

Concluding point… managing the complexities.

“Old School” verification process- oriented around Synchronous generation-no longer sufficient…

New verifications with more detailed and more extensive simulation needs

Page: 9

www.hvdccentre.com