摘要：AbstractThis work analyzes the effect of estimating the excitation force in a model-based fault diagnosis (FD) of a wave energy converter (WEC). This force is a non-measurable variable related to the elevation of the sea waves at the location of the floater through a non-causal kernel function. Hence, two strategies are studied here: real-time estimates from predicted wave elevation and smoothed estimates from available measurements. To compare the performance of FD schemes based on each estimate, one considers faults in the damping subsystems of a WEC based on the Archimedes wave swing prototype. The FD scheme is also composed of an unknown input observer for fault detection and an estimator of the magnitude of the faults. Numerical simulations with irregular sea waves show improved diagnosis with smoothed estimates of the excitation force, at the expense of introducing some time delay
关键词：KeywordsFault diagnosisexcitation force estimationunknown input observerwave energy converterrenewable energy
