Resilient wide-area damping control for interarea oscillation considering communication failure

The wide-area damping controller, which uses the wide-area signal transmitted by communication network as the input signal, is an effective measure to suppress interarea oscillations. However, communication failure may occur when communication device fault, disaster or even attack occur. It would lead to the loss of wide-area signal and may disable the wide-area damping controller (WADC). To address this problem, this paper proposes a resilient WADC by employing both a wide-area signal and a local signal as the input signals to combine the observability and reliability of input signals. Moreover, a goal representation heuristic dynamic programming (GrHDP) algorithm is employed to design the resilient WADC of voltage source converter high voltage direct current (VSC-HVDC) transmission system for interarea oscillation. The proposed resilient GrHDP-WADC has the ability of online learning and strong adaptivity to handle the communication failure. Meanwhile, it does not need the exact model of the power system. Case study is undertaken based on a 10-machine 39-bus system with one VSC-HVDC transmission line. Simulation results show that the proposed resilient GrHDP-WADC can maintain a good control performance under communication failure.