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Transient AC voltage related phenomena for HVDC schemes connected to weak AC systems

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3 Author(s)
Pilotto, L.A.S. ; Centro de Pesquisas de Energia Eletrica, Rio de Janeiro, Brazil ; Szechtman, M. ; Hammad, A.E.

A didactic explanation of voltage-stability-associated phenomena at HVDC terminals is presented. Conditions leading to AC voltage collapse problems are identified. A mechanism that excites control-induced voltage oscillations is shown. The voltage stability factor is used to obtain the maximum power limits of AC/DC systems operating with different control strategies. Correlation to Pd×Id curves is given. Solutions for eliminating the risks of voltage collapse and for avoiding control-induced oscillations are discussed. The results are supported by detailed digital simulations of a weak AC/DC system using EMTP

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Power Delivery, IEEE Transactions on  (Volume:7 ,  Issue: 3 )