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Enhanced LMI-based Damping Control in Power Networks through a High Voltage Direct Current Line

Large interconnected power networks are arguably some of the most complicated man-made systems to understand and characterize. This becomes even more complicated due to the surge of renewables that are connected (possible via HVDC lines) to the network. Faults, such as the tripping of an electricity line, can easily occur in a network, which can cause undesired oscillatory behaviour. This paper proposes an output-feedback controller that aims at diminishing these oscillations. The presented controller consists of a state-feedback gain and a Kalman filter and is tuned by employing an in this work identified model. The proposed controller ensures a lower bound on the closed-loop damping coefficients of the network.