Abstract
This research paper would be devoted to the application of a fault-tolerant control (FTC) for a benchmark system composed of three interconnected tanks in case of sensor faults. The control scheme includes two blocks: fault detection and isolation (FDI) block and a control law reconfiguration block. The strategy of the FDI method is based on a bank of high gain observers; each of them is constructed to estimate the system state vector. Thus, the diagnostic signal-residuals are generated by the comparison of measured and estimated outputs and the faulty sensor is isolated. The reconfiguration block performs an update of the controller parameters according to the operating mode. The application of this method to a pilot plant demonstrates that the hydrographic system maintains quite performances after sensor faults occurrence.
Highlights
Any automation of a process aims at reaching an almost perfect solution to obtain a final product of good quality and health of all faults. e automated system control theory has been widely developed and applied to the industrial process.ese techniques ensure the stability of the closed-loop system and yield a predefined performance in the case where all system components operate safely
Known as active fault-tolerant control (FTC), requires a fast fault detection and isolation (FDI) algorithm followed by a control law adjustment that allows maintaining high performances in the controlled system
We focus on the online sensor fault detection and isolation by adopting high gain observers’ bank
Summary
Any automation of a process aims at reaching an almost perfect solution to obtain a final product of good quality and health of all faults. e automated system control theory has been widely developed and applied to the industrial process. Known as passive FTC, aims at designing a robust controller against some given faults. Another approach, known as active FTC, requires a fast fault detection and isolation (FDI) algorithm followed by a control law adjustment that allows maintaining high performances in the controlled system. E detection and isolation of faults is an important research area in process control due to the improvements that can be reached in terms of the safety and reliability of the plant. E three-tank system (3TS) is considered an important and effective prototype of many applications in industrial processes, such as water treatment, food industry, chemical and petrochemical plants, oil, and gas systems. A conclusion and some perspectives are given in the sixth section
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