Abstract
This paper aims to contribute to the fault-tolerant control of the current sensor. The system studied is a double star induction machine (DSIM) controlled by a robust control called Active Disturbance Rejection Control (ADRC). The proposed method makes it possible to detect, isolate, and reconfigure the fault in real time. The reconfiguration is based on the comparison between the values measured by the current sensors and the estimated values. Two voltage observers will be used to estimate the estimated currents, and these two observers are placed at the level of the converters. This method of fault-tolerant control (FTC) has the advantage of ensuring, even in the presence of a sensor fault, the continuity of the system’s operation and maintaining its performance at the desired level. The effectiveness of the FTC strategy proposed in this work is illustrated with simulations carried out under the MATLAB/Simulink environment.
Highlights
Introduction e double star induction machine (DSIM) is a multiphase machine that is widely used due to its advantages such as power segmentation, the ability to operate in the event of failure of one of the stars, and reduction in stress on the converters [1,2,3]. e control of the DSIM is generally provided by PI controllers, but because of the sensitivity of these controllers to the variation of machine parameters, nonlinear controllers are often used which are insensitive to disturbances, whether parameter variations or load variations
A neural network algorithm is implemented to detect the fault, and a logic circuit is used as a compensation unit. e work developed in [10] proposes a new fault-tolerant control (FTC) approach for the DSIM system. is presented method compares the estimated current values with the measured ones; a state observer is used to calculate the currents from the voltages
Motivated by the abovementioned observations, the present paper proposes a robust tolerant control for current sensor measurement faults of the DSIM system. e proposed method has the advantage of avoiding the error of estimation of the observers’ gains that are often used. e method is based on the use of a stator current estimator based on the mathematical equations of the machine and the use of two voltage observers
Summary
Other methods using two current sensors are as follows. Chakraborty and Verma [11] developed a new method of FTC by using axes transformation. E passive fault tolerant command is based on the robustness of the controllers such as backstepping regulator. E proposed tolerant control technique is based on the estimation of stator currents and its comparison with the measured currents. Motivated by the abovementioned observations, the present paper proposes a robust tolerant control for current sensor measurement faults of the DSIM system. E method is based on the use of a stator current estimator based on the mathematical equations of the machine and the use of two voltage observers. E rest of this paper is organized as follows: Section 2 gives the modeling of the double star induction machine in Park’s frame and presents its vector control based on ADRC regulators. Offset defect: the received signal is not a zero-centered signal
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