Networked Predictive Control Based Wide-Area Supplementary Damping Controller of SVC with Communication Delays Compensation

This paper presents the design of a networked predictive control (NPC) based wide-area supplementary damping controller (WSDC) of SVC in order to damp the inter-area low frequency oscillations in large-scale interconnected power system. The major advantage of the proposed WSDC is that it can compensate constant and random communication delays existing in wide-area signals in an active way. Moreover, a recursive least-squares algorithm (RLSA) with a variable forgetting factor is applied to identify the predictive model of the power system to overcome the model inaccuracies and uncertainties. Case studies undertaken on a two-area four-machine power system with a SVC device installed show that the proposed WSDC can provide better damping performances than the conventional WSDC especially when the wide-area signals exist communications delays.