Título:
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Control of modular multilevel converters under singular unbalanced voltage conditions with equal positive and negative sequence components
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Autor/a:
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Prieto Araujo, Eduardo; Junyent Ferré, Adrià; Clariana Colet, Gerard; Gomis Bellmunt, Oriol
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Otros autores:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Elèctrica; Universitat Politècnica de Catalunya. CITCEA - Centre d'Innovació Tecnològica en Convertidors Estàtics i Accionaments |
Abstract:
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This paper focuses on the control of Modular Multilevel Converters (MMC) for High Voltage DC (HVDC) applications during unbalanced AC grid voltage sags where positive and negative sequence voltages are equal. The control scheme is based on six arm energy regulators, six independent current controllers, and two reference calculation stages that convert the power references into grid and inner current references. Conventional inner AC currents reference calculation fails if the amplitude of the positive and the negative sequence AC grid voltages are equal, a state which is referred to in this paper as singular voltage condition. This paper discusses the types of network faults that cause this condition and proposes three different solutions to operate the converter in such scenarios. The adequacy of the proposed solutions is validated through simulations considering each of the problematic fault scenarios. |
Abstract:
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Peer Reviewed |
Materia(s):
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-Àrees temàtiques de la UPC::Enginyeria elèctrica -Electric currents -Converts -HVDC transmission -modular multilevel converters -unbalanced operation -voltage-source converter -Convertidors de corrent elèctric -- Disseny i construcció -Energia elèctrica -- Transmissió |
Derechos:
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Tipo de documento:
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Artículo - Versión publicada Artículo |
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