Adaptive Feedback Linearization Control for Power Oscillations Damping in AC/DC Power System

This research work proposes the supplementary control design for multiple High Voltage DC (HVDC) links to damp out post-contingency oscillations and enhance the stability of large interconnected AC/DC power system. The proposed MIMO supplementary control scheme uses nonlinear feedback linearization control with real-time optimized Neuro-Fuzzy identification of the power system dynamics and online self-tuning of controller parameters. An appropriate control signal is generated that modulates the real power flow through HVDC link and improves the damping of low frequency electro-mechanical oscillations during perturbed operating conditions. The performance of the proposed control is validated through comparison against the conventional PID control under a variety of contingency conditions of multi-machine test power system. The results demonstrate a significant improvement in both transient and steady-state stability of the power system.