A Network Delay Compensation Technique for Wide-Area SVC Damping Controller in Power System

Network uncertainties, such as time-varying delays, packet losses, packet disorder, seriously deteriorate the performance and stability of any network based control system. To address this issue, a systematic approach has been suggested in this paper to compensate for the network latency in the application of synchrophasor assisted wide area control for the Static Var Compensator (SVC). The power oscillation modes are estimated online in presence of packet drop in a communication network. The modes are monitored through a modified Modified Extended Kalman Filter (MEKF) approach. The time delay has been compensated by predicting the dynamics of the delayed measurement signal. A network control system model has been developed incorporating the Phasor Measurement Units (PMUs), event driven communication network and network buffers to mimic the response of a real time communication based control. The wide-area stabilizing controller has been designed based on Takagi-Sugeno (TS) fuzzy approach. The performance of the proposed delay compensation scheme has been tested on 39-bus New England system.