A Robust Wide-Area Measurement-Based Damping Controller for Networks With Embedded Multiterminal and Multiinfeed HVDC Links

Control strategies for power swing damping which use wide-area feedback signals need to be robust to partial/complete loss of communication and changes in operating points and topology. In addition, they should have a positive effect on all controllable swing modes and ensure adequate stability margins to avoid destabilization of untargeted modes. This paper proposes a control strategy for multiple embedded dc links (multi- terminal or multi-infeed), which has all these attributes and is inherently able to provide wide band damping. The strategy uses only a limited set of non local signals. These signals may be directly communicated to the dc links without having to be centrally collated with other system-wide measurements, thereby reducing communication delays. The strategy can easily be adapted during power system operation to achieve targeted damping of the critical swing modes.