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This paper proposed an transient-based optimal parametric tuning method forpower system stabilizer (PSS) based on trajectory sensitivity (TS) analysis ofhybrid system, such as hybrid power system (HPS). The main objective is toexplore a systematic optimization approach of PSS under large disturbance ofHPS, where its nonlinear features cannot be ignored, which, however, thetraditional eigenvalue-based small signal optimizations do neglect the higherorder terms of Taylor series of the system state equations. In contrast toprevious work, the proposed TS optimal method focuses on the gradientinformation of objective function with respect to decision variables by meansof the trajectory sensitivity of HPS to the PSS parameters, and optimizes thePSS parameters in terms of the conjugate gradient method. Firstly, thetraditional parametric tuning methods of PSS are introduced. Then, thesystematic mathematical models and transient trajectory simulation arepresented by introducing switching/reset events in terms of triggeringhypersurfaces so as to formulate the optimization problem using TS analysis.Finally, a case study of IEEE three-machine-nine-bus standard test system isdiscussed in detail to exemplify the practicality and effectiveness of theproposed optimal method.

Optimization Approach to Parametric Tuning of Power System Stabilizer Based on Trajectory Sensitivity Analysis