Control of a multi-terminal DC transmission system with reduced power oscillation

The control of multiterminal HVDC systems based on local variables has shown a better performance, in terms of dynamical response and implementation simplicity, than constant DC voltage and droop control. However, power oscillations can be produced due to the interaction among different HVDC stations. In this paper, a modified control logic for this type of control is proposed in order to reduce the power oscillations generated when the HVDC stations change its operation mode. The new control logic locks the operating mode of each station for a given time avoiding interactions with other HVDC stations after sudden changes in the DC voltage or power.

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