Diagnosis and Fault-Tolerant Control

Blanke, Mogens; Kinnaert, Michel; Lunze, Jan; Starosweicki, Marcel

doi:10.1007/978-3-662-47943-8

Cited by 341 publications

(239 citation statements)

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“…For this reason, the assurance of the most trouble-free operation of such devices becomes more important. In this context, the issues of fault prediction and diagnostics, as well as ways of prevention actions and fault tolerant control become particularly pertinent [7]. Most frequently, the electro-pneumatic transducer is subject to fail in case of electro-pneumatic final control elements.…”

Section: Introductionmentioning

confidence: 99%

The Trade-Off between the Controller Effort and Control Quality on Example of an Electro-Pneumatic Final Control Element

Bartyś¹,

Hryniewicki²

2019

Preprint

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For many years, the programmable positioners have been widely applied in structures of modern electro-pneumatic final control elements. The positioner consists of an electro-pneumatic transducer, embedded controller and measuring instrumentation. Electro-pneumatic transducers that are used in positioners are characterized by a relatively short mean time-to-failure. The practical and economical method of a reasonable prolongation of this time is proposed in this paper. It is principally based on assessment and minimizing the effort of the embedded controller. For this purpose, were introduced: the control value variability, mean-time and the cumulative controller's effort. The diminishing of controller effort has significant practical repercussions, because it reduces the intensity of mechanical wear of the final control element components. On the other hand, the reduction of the cumulative effort is important in the context of process economy due to limitation of the consumption of energy of compressed air supplying the final control element. Therefore, the minimization of introduced effort factors has an impact on increasing the functional safety and economics of the controlled process. As a result of the performed simulations, the recommendations regarding the selection of the structure and tuning of positioner controller were elaborated. The simulations were performed in the Matlab-Simulink environment with the use of the liquid level control system in which a phenomenological model of a final control element was deployed. It has been proven that under appropriate conditions, it is possible to extend significantly the lifetime of the final control element and simultaneously enhance the control quality factors.

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Section: Introductionmentioning

confidence: 99%

The Trade-Off between the Controller Effort and Control Quality on Example of an Electro-Pneumatic Final Control Element

Bartyś¹,

Hryniewicki²

2019

Preprint

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“…µ αβ i f (29) the real (measured) value of the stator current is: (30) and the estimation error of the stator current is expressed as:…”

Section: Improvement Of the Drive Performance During Itsc By An Ftc Umentioning

confidence: 99%

“…These types of machines allow for the acceptable operation of the drive after the stator windings lose a phase. The main drawbacks of FTC systems based on hardware redundancy are high costs and complexity [27,30].…”

Section: Introductionmentioning

confidence: 99%

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Modified Rotor Flux Estimators for Stator-Fault-Tolerant Vector Controlled Induction Motor Drives

Dybkowski

Bednarz

2019

Energies

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This paper deals with fault-tolerant control (FTC) of an induction motor (IM) drive. An inter-turn short circuit (ITSC) of the stator windings was taken into consideration, which is one of the most common internal faults of induction machines. The sensitivity of the classic, well-known voltage and current models to the stator winding faults was analyzed. It has been shown that these classical state variable estimators are sensitive to induction motor parameter changes during stator winding failure, which results in unstable operation of the direct field-oriented control (DFOC) drive. From a safety-critical applications point of view, it is vital to guarantee stable operation of the drive even during faults of the machine. Therefore, a new FTC system has been proposed, which consists of new modified rotor flux estimators, robust to stator winding faults. A detailed description of the proposed system is presented herein, as well as the results of simulation and experimental tests. Simulation analyses were performed using MATLAB/Simulink software. Experimental tests were carried out on the experimental test bench with a dSpace DS1103 card. The proposed solution could be applied as an alternative rotor flux estimation technique for the modern FTC drive.

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“…For this reason, the assurance of the most trouble-free operation of such devices becomes more important. In this context, the issues of fault prediction and diagnostics, as well as ways of prevention actions and fault tolerant control become particularly pertinent [8]. Most frequently, the electro-pneumatic transducer is subject to fail in the case of electro-pneumatic final control elements.…”

Section: Introductionmentioning

confidence: 99%

The Trade-Off between the Controller Effort and Control Quality on Example of an Electro-Pneumatic Final Control Element

Bartyś

Hryniewicki

2019

Actuators

View full text Add to dashboard Cite

For many years, the programmable positioners have been widely applied in structures of modern electro-pneumatic final control elements. The positioner consists of an electro-pneumatic transducer, embedded controller, and measuring instrumentation. Electro-pneumatic transducers that are used in positioners are characterized by a relatively short mean time-to-failure. The practical and economical method of a reasonable prolongation of this time is proposed in this paper. It is principally based on assessment and minimizing the effort of the embedded controller. For this purpose, some measures were introduced: The control value variability, mean-time, and the cumulative controller’s effort. The diminishing of controller effort has significant practical repercussions because it reduces the intensity of mechanical wear of the final control element components. On the other hand, the reduction of the cumulative effort is important in the context of process economy due to limitation of the consumption of energy of compressed air supplying the final control element. Therefore, the minimization of control effort indicators has an impact on the increase of the functional safety and economics of the controlled process. The simulations were performed in the Matlab-Simulink environment with the use of the liquid level control system in which a phenomenological model of a final control element was deployed. As a result of the performed simulations, the recommendations regarding the selection of the structure of positioner controller were elaborated.

show abstract

Diagnosis and Fault-Tolerant Control

Cited by 341 publications

References 0 publications

The Trade-Off between the Controller Effort and Control Quality on Example of an Electro-Pneumatic Final Control Element

The Trade-Off between the Controller Effort and Control Quality on Example of an Electro-Pneumatic Final Control Element

Modified Rotor Flux Estimators for Stator-Fault-Tolerant Vector Controlled Induction Motor Drives

The Trade-Off between the Controller Effort and Control Quality on Example of an Electro-Pneumatic Final Control Element

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