A Framework for Observer-Based Robust Fault Detection in Nonlinear Systems With Application to Synchronous Generators in Power Systems
Muhammad Asim Shoaib, Abdul Qayyum Khan, Ghulam Mustafa, Sufi Tabbasum Gul, Owais Khan, Aadil Sarwar Khan
Abstract
A nonlinear robust fault detection scheme for synchronous generators in power systems is presented. The higher-order model of a synchronous generator having nonlinearity in dynamics is considered. A nonlinear observer-based fault detection (FD) scheme is proposed so that the designed FD is robust against disturbances, uncertainties, and sensitive to faults. To this end, a mixed <inline-formula><tex-math notation="LaTeX">$\mathcal {L}_{-}/\mathcal {L}_\infty$</tex-math></inline-formula> induced norm-based framework is proposed, and various faults that are encountered in synchronous generators are investigated. The success of the proposed scheme is demonstrated through an application to IEEE 9-bus and 3-machine systems.