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    Item type:Publication, Access status: without files ,
    Study of centralized and distributed coordination of power injection in multi-TSO HVDC grid with large off-shore wind integration
    (Elsevier, 2016)
    Babazadeh, Davood
    ;
    Van Hertem, Dirk
    ;
    Nordström, Lars
    This paper studies centralized and distributed schemes for the coordination of power injection in an HVDC grid connected to large wind generation. This coordination of power injection aims to keep the power balanced within the HVDC grid especially during large wind disturbances. Furthermore, the coordination tries to follow the converters' schedules set by the connecting AC-TSOs every 15-min. This schedule comes from an overall combined AC/DC economic dispatch calculation with lower resolution compared to this coordination. In this paper, the coordination of power injection has been formulated as a non-linear constrained optimization problem for the centralized architecture. Next, the centralized optimization problem is decomposed to sub-problems using the Auxiliary Problem Principle (APP) method for the distributed architecture. This distributed optimization problem is solved by exchanging the required information between the AC TSOs. These two different approaches have been evaluated for a 5-terminal HVDC grid. Furthermore, a sensitivity analysis has been carried out to find the optimal updating rate of power injection set-points. The result shows that the more frequent updating of power injection coordination in the centralized architecture improves the generation reserves in each AC area.
    Publicationtype: Journal Article
      45
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    Item type:Publication, Access status: without files ,
    Coordination of power injection in HVDC grids with multi-TSOs and large wind penetration
    (IEEE, 2015-02)
    Babazadeh, Davood
    ;
    Van Hertem, Dirk
    ;
    Rabbat, Michael
    ;
    Nordström, Lars
    This paper proposes different architectures for the coordination of power injection in interconnected hybrid AC/DC grids with Multi-TSO. The power dispatch problem is first formulated for the HVDC grid with the aim of keeping the balance in real time and try to follow the 15-min schedules introduced by AC TSOs considering the ongoing changes in the HVDC grid. Next, the Auxiliary Problem Principle (APP) method is proposed to decompose the dispatch problem and distributed between connected AC operators who control the local converters. Two different approaches are tested and the sensitivity of the OPF updating rate has been evaluated for a 5-area HVDC grid with the wind production.
    Publicationtype: Conference Paper
      51