Nonlinear Control Design of Shunt Flexible AC Transmission System Devices for Damping Power System Oscillation

Problem statement: The disturbance in the complicated network of power system may cause in nonlinear response.Static Synchronous Compensator (STATCOM) is a power electronic based device that has the capability of controlling the line current.This study applies the STATCOM to decrease the over line current in power system during dynamic state.Approach: This study proposes the control strategy of a STATCOM to enlarge the stability region of a simple power system.The control is determined very carefully to satisfy the Lyapunov's stability criterion and is found to be a non-linear function of system states.The proposed nonlinear control of STATCOM for damping power system oscillation is investigated through the sample system.Results: The maximum generator rotor angle of the faulted system without a STATCOM is continuously oscillation and the maximum value is much more than the system with a STATCOM.Conclusion: STATCOM based the proposed nonlinear control can damp power system oscillation.