A measurement-based control input-output signal selection approach to damp inter-area oscillations

Wide-area measurement systems enable the wide-area damping controller (WADC) to use remote signals to enhance the small signal stability of large scale interconnected power systems. Due to the global properties, conventional control input-output selection approach based on the detailed mathematical models are not available for the complicated systems. A new measurement-based damping control input- output signal selection approach is proposed based on the residue of a constructed linear autoregressive exogenous (ARX) model, which is applied to derive a low-order black-box transfer function model of a power system with power system stabilizers (PSSs) using wide-area signals. Fast Fourier transform (FFT) analysis is performed to preselect the feedback signals at the dominant mode for ARX model construction. Based on the identified ARX model, the residue is used to select the optimal control input-output pairs. Finally, the selected control input- output signal pair is verified by the control performance comparison in a 16-machine 68-bus power system.