Flatness based TCSC controller for transient stability enhancement of power system

This paper gives a different viewpoint of flatness which uses a coordinate change based on a Lie-Backlund approach to equivalence in developing flatness-based feedback linearization and its application to the design of model predictive control (MPC) based flexible-AC transmission systems (FACTS) controller for power system transient stability improvement. The flat output provides the framework to derive the endogenous feedback compensator, which can result in a constant linear controllable system, for a given nonlinear system. The MPC has been applied on the linear system, which is in terms of flat outputs by which it is easy to compute the control efforts required to stabilize the system in post-fault region. The proposed flatness-based TCSC controller using MPC strategy is validated using MATLAB simulation results for single-machine-infinite-bus (SMIB). The simulation results have proved the effectiveness of the proposed control strategy, even when the fault is cleared after critical clearing time.