VSC-HVDC Technology for the Connection of Offshore Windfarms
Dr Mark Davies Team Leader System Performance WG B4.62 Connection of Windfarms to Weak AC networks.
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Transcript of Dr Mark Davies Team Leader System Performance WG B4.62 Connection of Windfarms to Weak AC networks.
![Page 1: Dr Mark Davies Team Leader System Performance WG B4.62 Connection of Windfarms to Weak AC networks.](https://reader033.fdocuments.net/reader033/viewer/2022061602/5697bf991a28abf838c91609/html5/thumbnails/1.jpg)
Dr Mark Davies
Team Leader System Performance
WG B4.62Connection of Windfarms to Weak AC networks
![Page 2: Dr Mark Davies Team Leader System Performance WG B4.62 Connection of Windfarms to Weak AC networks.](https://reader033.fdocuments.net/reader033/viewer/2022061602/5697bf991a28abf838c91609/html5/thumbnails/2.jpg)
Experiences with low SCR connections
1. SVCs on long radial feeder
2. LCC HVDC with very low SCR (near 1 !!)
3. LCC HVDC with WTG interaction
4. VSC HVDC with WTG interaction
5. WTG with SCR < default requirement
![Page 3: Dr Mark Davies Team Leader System Performance WG B4.62 Connection of Windfarms to Weak AC networks.](https://reader033.fdocuments.net/reader033/viewer/2022061602/5697bf991a28abf838c91609/html5/thumbnails/3.jpg)
Item 1: Risk - Understand & Define
• Generators that require a minimum SCR (e.g. HVDC or WTGs) by implication also create some system degradation.
![Page 4: Dr Mark Davies Team Leader System Performance WG B4.62 Connection of Windfarms to Weak AC networks.](https://reader033.fdocuments.net/reader033/viewer/2022061602/5697bf991a28abf838c91609/html5/thumbnails/4.jpg)
Item 1 : Risk – Managing it• How can the system impact:
• be measured• extreme effects be mitigated and• a fair system of management be applied?
![Page 5: Dr Mark Davies Team Leader System Performance WG B4.62 Connection of Windfarms to Weak AC networks.](https://reader033.fdocuments.net/reader033/viewer/2022061602/5697bf991a28abf838c91609/html5/thumbnails/5.jpg)
Item 2: Technical – The Challenges1. Make WTG synchronisation performance closer
to that of synchronous generators
2. Make WTGs behave more like synchronous voltage sources
![Page 6: Dr Mark Davies Team Leader System Performance WG B4.62 Connection of Windfarms to Weak AC networks.](https://reader033.fdocuments.net/reader033/viewer/2022061602/5697bf991a28abf838c91609/html5/thumbnails/6.jpg)
Item 2: Technical – Improvements ?
• Due to their large ratings HVDC systems often operate with low SCR. Can WTG systems leverage off the experiences of these related power conversion devices?
• Two areas of synergy are:1. (re)synchronisation performance - (PLL delays)
2. fault current limitation