Research On Power System Stabilizer Based On H_∞ Control Theory

In this thesis, a new method of designing power system stabilizer based on H∞ control theory is presented, it can avoid the bad robust and adapt performance of conventional PSS. Because it's hard to select weighting function in H∞PSS design, and the controller designed directly always has high order, the application of H∞PSS is limited. In order to avoid these, the paper presents a general weighting function selection method and a balanced method of reducing the order of the controller based on Gram matrix. The nonlinear simulations and dynamic simulating tests show that H∞PSS is insensitive to the changes of operating conditions and perturbations, it can restrain oscillations under a wider range of operating conditions than the conventional PSS. The robustness of H∞PSS is very good. Yang Lin (Power System and its Automation) Directed by prof. Zhao Shuqiang...