Distributed fault detection and isolation for multimachine power systems

This paper presents a distributed fault detection and isolation scheme for multimachine power systems. Each generator is interconnected with other machines through a transmission network, where the interactions between directly interconnected machines are nonlinear. In the distributed FDI scheme, a local FDI component is designed for each generator excitation system in the overall system based on local measurements and certain communicated information from other FDI components associated with other machines that are directly interconnected to the local subsystem. Under certain assumptions, in each FDI component, adaptive thresholds for distributed fault detection and isolation are derived, ensuring robustness with respect to nonlinear interconnection and unstructured modeling uncertainty. A simulation example of a two-machine power system is used to illustrate the effectiveness of the proposed method.