The stability of AGC systems with real parameter uncertainties and communication delays

In this paper, the stability performance of multi-area AGC system with real parameter uncertainties/perturbations and communication delays is analyzed. By virtue of Linear Fractional Transformation (LFT) technique, a M-Δ structure with mixed structured uncertainties is developed. An optimization model to evaluate the delay margins at different parameter perturbations is proposed and an algorithm based on μ analysis and frequency-sweeping test is developed to solve the problem. Frequency analysis and time domain simulation in case studies validate the effectiveness of the proposed method.