Abstract
The inherent redundancy of balanced three-phase currents (voltages) is exploited to design a fault detection and isolation system for current (voltage) sensors. To this end, a model for balanced three-phase signals (either sinusoidal or non sinusoidal) is presented. It is used to design a residual generator based on the so-called Generalized Observer Scheme (GOS). Next, a decision system made of a combination of vector CUSUM (Cumulative Sum) algorithms is used in order to process the residual vector and achieve detection and isolation of incipient additive faults. The approach is validated on experimental data. Fault detection and isolation (FDI) is achieved for a large range of fault magnitudes and an accurate estimation of the fault occurrence time is also determined.
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