Damping of Inter-Area Low Frequency Oscillation Using an Adaptive Wide-Area Damping Controller

Abstract

-This paper presents an adaptive wide-area damping controller (WADC) based on generalized predictive control (GPC) and model identification for damping the inter-area low frequency oscillations in large-scale inter-connected power system. A recursive least-squares algorithm (RLSA) with a varying forgetting factor is applied to identify online the reduced-order linearlized model which contains dominant inter-area low frequency oscillations. Based on this linearlized model, the generalized predictive control scheme considering control output constraints is employed to obtain the optimal control signal in each sampling interval. Case studies are undertaken on a two-area fourmachine power system and the New England 10-machine 39-bus power system, respectively. Simulation results show that the proposed adaptive WADC not only can damp the inter-area oscillations effectively under a wide range of operation conditions and different disturbances, but also has better robustness against to the time delay existing in the remote signals. The comparison studies with the conventional lead-lag WADC are also provided.

Power System Oscillations Damping by Robust Decentralized DFIG Wind Turbines

“…Moreover, when the severe short circuits occur in the system, the inter-area oscillation may cause the system instability. To damp out the inter-area oscillation, the power system stabilizer (PSS) has been successfully applied [2,3]. Nevertheless, the PSS may cause the negative impact to the voltage control of automatic voltage regulator (AVR) [4].…”