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The paper investigates power transmission limitations in a VSC-HVDC system imposed by the ac system's impedance characteristics. An important observation from the study is that the operation of the converter is affected, not only by the magnitude of this impedance (quantified by the Short Circuit Ratio or SCR), but also significantly by its angle. An interesting result is that the larger the resistive...
This paper focuses on generic Type 4 wind turbine generators models, their applicability in modern HVDC connections and their capability to provide advanced ancillary services therefrom. A point-to-point HVDC offshore connection is considered. Issues concerning coordinated HVDC and wind farm control as well as the need of a communication link are discussed. Two possible control configurations are...
This paper focuses on the control schemes required on offshore VSC-HVDC networks to transmit the power to the onshore grid and provide fast frequency response for the AC grid. The simulation results show the benefits of such control scheme to restore the frequency in the grid after a loss of generation. The results further investigated the consequence of frequency disturbance in the islanded offshore...
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