Performance Analysis of Grid Connected Multi Lethal HVDC System

Performance Analysis of Grid Connected Multi Lethal HVDC System



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    When connecting a wind park (WP) to the main grid (MG) by way
    of an HVDC Light transmission system, the WP becomes decoupled from the
    MG, which results in several technical and economic benefits, on a variety of
    aspects, for transmission system operators (TSOs), WP developers and WTG
    manufacturers. Perhaps most important for TSOs is that an HVDC-Light
    connected WP becomes comparable to a normal power plant; the MG-side
    HVDC Light converter can be directly connected to a control or power
    dispatch center. A desirable consequence is also that AC faults appearing in
    the WP or MG grid will not be propagated by the HVDC Light transmission
    system, which has several desirable consequences such as possibly reduced
    mechanical stresses on the WTGs. This paper presents operation and control
    strategies of multi-terminal HVDC transmission system (MTDC) using
    voltage source converters (VSCs) for integrating large offshore wind farms.
    The framework and operation principles of the proposed system are described
    and control strategies for coordinating various VSCs are proposed. DC
    voltage control based on the DC voltage-current (V-I) droop characteristic of
    grid side converters is implemented, to ensure stable system operation and
    flexible power dispatch between various onshore AC grids. To validate the
    performance of the proposed control strategies, a typical four terminal MTDC
    networks, which connecting two offshore wind farms with two onshore AC
    grids, is established in PSCAD/EMTEC. Simulation results under normal and
    abnormal operation conditions verify the satisfactory performance of the
    proposed control strategy and accuracy of the theoretical analysis.
    Keywords: Control, HVDC, multi-terminal, voltage source converter, wind
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    Performance Analysis of Grid Connected Multi Lethal HVDC System