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WG B4.62 Connection of Windfarms to Weak AC networks

WG B4.62 Connection of Windfarms to Weak AC networks. Dr Mark Davies Team Leader System Performance. Experiences with low SCR connections. SVCs on long radial feeder LCC HVDC with very low SCR (near 1 !!) LCC HVDC with WTG interaction VSC HVDC with WTG interaction

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WG B4.62 Connection of Windfarms to Weak AC networks

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  1. WG B4.62Connection of Windfarms to Weak AC networks Dr Mark Davies Team Leader System Performance

  2. Experiences with low SCR connections • SVCs on long radial feeder • LCC HVDC with very low SCR (near 1 !!) • LCC HVDC with WTG interaction • VSC HVDC with WTG interaction • WTG with SCR < default requirement

  3. Item 1: Risk - Understand & Define • Generators that require a minimum SCR (e.g. HVDC or WTGs) by implication also create some system degradation.

  4. Item 1 : Risk – Managing it • How can the system impact: • be measured • extreme effects be mitigated and • a fair system of management be applied?

  5. Item 2: Technical – The Challenges • Make WTG synchronisation performance closer to that of synchronous generators • Make WTGs behave more like synchronous voltage sources

  6. 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: • (re)synchronisation performance - (PLL delays) • fault current limitation

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