Adaptive Wide Area Damping Controller for Damping Inter-Area Oscillations On Power System

A Wide Area Damping Controller (WADC) strategy is presented to damp the inter-area low-frequency oscillations in power systems based on Wide Area Measurement Signals (WAMS) and Global Power System Stabilizers (GPSS). The proposed WADC scheme includes three control parts as: 1) GSG:Global Signal Generator; 2) GSC: Global Signal Combinator; 3) GPSS: Global Power System Stabilizer. which two concepts of them including observability for control signals and controllability for GPSS are considered as the main goals. The control signals are selected based on WAMS structure in GSG, while the best signals to obtain the best observability for oscillatory modes are combined together in GSC, and a Global Signal (GS) is generated to send to some PSSs. To make an optimized GPSS (that is constructed by some local PSSs), different combinations of local PSSs with various number of them are considered in this paper. After selection of the mentioned candidates, GS will be sent for them to damp interarea oscillations, and finally the best combination can be selected on the basis of maximum damping ratio. The control strategy is carried out on a modified IEEE 14-buses as a case study and the simulations are done in time domain. The results show the effectiveness of the proposed scheme for fast damping the simulated oscillations.