Introduction.- Theoretical Foundation of Low Frequency Oscillations.- Oscillatory Parameters Computation based on Improved HHT.- Oscillation Model Identification based on Nonlinear Hybrid Method (NHM).- Identification of Dominant Complex Orthogonal Mode (COM).- Basic Framework and Operating Principle of Wide Area Damping Control.- Coordinated Design of Local PSSs and Wide Area Damping Controller.- Robust Coordination of HVDC and FACTS Wide Area Damping...