A Novel Failure-Distribution-Dependent Non-Fragile H_∞ Fault-Tolerant Load Frequency Control for Faulty Multi-Area Power Systems

This article studies the non-fragile <tex-math notation="LaTeX">H_∞</tex-math> fault-tolerant load frequency control problem for multi-area power systems with actuator failures. At first, considering the distribution characteristics of partial failures, a stochastic distribution model is established for actuator partial failures. Next, for the perturbations of controller gains, not only the additive uncertainties but also the multiplicative uncertainties are incorporated into the fault-tolerant controller design. The coupling items which hardly directly solved have turned into a W-problem in fault-tolerant load frequency control. Furthermore, a novel failure-distribution-dependent non-fragile <tex-math notation="LaTeX">H_∞</tex-math> fault-tolerant load frequency control algorithm is given by using linear matrix inequalities technology and Lyapunov-Krasovskii functional method. Finally, a numerical example with a three-area power system is given to show the effectiveness of the proposed methods.