Design Of Optimal State Feedback Switching Lqr’s For Power System With Upfc At Different Operating Points

Abstract

As a preliminary analysis, this paper presents the design of Bryson, Bouderal and multistage-based Linear Quadratic Regulator (LQR) optimal controllers for the power system with UPFC at light, normal & heavy load conditions. For each load condition, the two best optimized feedback controllers are then selected based on the preliminary analysis and optimal switching strategy is implemented between two candidate controllers to further optimize output energy. The proposed solution is tested for the linearized Single Machine Infinite Bus (SMIB) Phillips-Heffron power system model installed with Uniform Power Flow Controller (UPFC). Simulation was done to verify the hypothesis using MATLAB/SIMULINK platform.