Delay-Dependent Networked Robust Stability Analysis for Load Frequency Control based on Single-Area Power System

The stability analysis for single-area power system with time-delay is studied. Firstly, a single-area system model which considers communication time-delay is established. In order to acquire better performance, PI controller is designed and an appropriate Lyapunov-Krasovskii functional is constructed. Based on the method of linear matrix inequality, the robust stability criterion of the system with PI parameters is derived. Furthermore, combined with numerical analysis, the maximum allowable delay of the system with different PI control gains in the case of different types of delays is analyzed. Finally, the simulation example analysis is given to testify the feasibility and superiority of the proposed method by comparing our results with existing ones.