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Simplified model of droop-controlled MTDC grid — Influence of MMC energy management on DC system dynamics

The interconnections of offshore wind farms have raised the interest of Multi-Terminal DC (MTDC) grids with voltage source converters, specifically with the Modular Multilevel Converter (MMC) topology. For controlling the DC bus voltage, the droop control strategy proves to be one of the most effective since it allows a shared effort between the different converters connected to the DC grid. Furthermore, these MTDC grids may likely result in multivendor schemes, where each converter could have different control strategies among them. Specially on the way that the internal energy of the MMC is managed, which may have an important impact on the DC voltage dynamics. This paper proposes a simplified model to represent the dynamic behavior of the DC grid including converters which highlights the droop gain and the energy management of the converter as main influential parameters. The performance of this model was assessed by comparisons with EMT simulations on a representative case study with different parameters.

Author(s):

Julian Freytes    
Grid Solutions from GE Power
France

Francois Gruson    
Arts et Metiers L2EP
France

Frederic Colas    
Arts et Metiers L2EP
France

Pierre Rault    
RTE
France

Hani Saad    
RTE
France

Xavier Guillaud    
Ecole Centrale de Lille L2EP
France

 

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