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Dynamics and Control of multi-terminal HVDC systems for off-shore wind farm integration

pubblicazioni - Articolo

Dynamics and Control of multi-terminal HVDC systems for off-shore wind farm integration

L’integrazione di grandi quantità energia eolica nella rete europea è un importante target dell’UE ma presenta diversi aspetti critici. La memoria analizza i problemi di stabilità dinamica di reti MTDC multi-terminali che connettono wind-farm marine alla rete AC, e discute l’applicazione di Special Protection Schemes (SPS) per la gestionedi eventi severi come la perdita dei convertitori.

This paper addresses dynamic modelling aspects concerning the operation of VSC-based MTDC networks connecting large offshore wind farms to mainland AC system. In particular, stability issues of the AC-DC system under severe contingencies such as AC fault on mainland side, DC cable faults, and loss of offshore VSC terminal are analysed, and possible stabilising controls are identified. The propose model includes the basic control strategies for converters on mainland and offshore side, and an additional global control which simulates the action of SPS-Special Protection System. Simulations are performed on a test system implemented in DIgSILENT Power Factory platform, including the proposed control systems and detailed models of wind turbine DFIGs. The work has been carried out within the FP7 European research project “TWENTIES”.

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