Coherency based online wide area control of wind integrated power grid

This paper introduces a novel method of designing Wide Area Control (WAC) based on a discrete Linear Quadratic Regulator (LQR) and Kalman filtering based state-estimation that can be applied for real-time damping of inter-area oscillations of wind integrated power grid. The main advantages of the proposed method are that the architecture provides a) online coherency grouping that properly characterizes real-time changes in the power grid b) online wide-area signal selection based on residue method for proper selection of the WAC signals. The proposed architecture thus accurately monitors changes in the power grid and select the appropriate control signal for more effectively damping the inter-area oscillation when compared to the conventional local signal based Power System Stabilizers (PSS) or offline based WAC designs. The architecture is tested on a wind integrated IEEE two area system and IEEE 39 bus system that shows the capability of the proposed method.