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1

Self-adaptive fault-tolerant control strategy of shunt active power filter based on multicellular converter

Bouhafs Ali, Rouabah Boubakeur, Kafi Mohamed Redouane, Louazene Lakhdar

Diagnostyka

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2023

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Vol. 24, No. 4

art. no. 2023411

EN

The use of multicellular topology in power quality enhancement can reduce the power loss and also dv/dt of power switches, minimize the electromagnetic interference. However, the failure of flying capacitors can reduce the active filtering efficiency and affect the power quality by injecting currents with wave-form distortion (harmonics, notching, noises etc.) in power distribution grid. Therefore, this study presents a faulttolerant control strategy (FTC) allowing to keep the normal operation conditions of a multicellular converter even under failure mode. The obtained results show that the proposed FTC strategy enhances the power quality of power distribution grid when a fault in flying capacitors occurs.

2

A new improved control for power quality enhancement in double fed induction generator using iterative learning control

Djaidja Oussama, Mekki Hemza, Zeghlache Samir, Djerioui Ali

Diagnostyka

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2023

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Vol. 24, No. 3

art. no. 2023309

EN

This work presents a new Fault Tolerant Control approach for a doubly fed induction generator using Iterative Learning Control when the fault occurs. The goal of this research is to apply the proposed ILC controller in conjunction with vector control for doubly fed induction generator to enhance its reliability and availability under broken rotor bars. However, the performances of classical VC control are often characterized by their inability to deal with the effects of faults. To overcome these drawbacks, a combination of VC control and iterative learning control is described. The input control signal of the VC controller is gradually regulated by the ILC harmonic compensator in order to eliminate the faults effect. The improvement of this approach related to active and reactive power ripples overshoot and response time have been explained. Which active and reactive power response time have been reduced more than 84% and 87.5 % respectively. The active and reactive power overshoots have been reduced about 45% and 35% respectively. The obtained results emphasize the efficiency and the ability of the proposed FTC to enhance the power quality in faulty condition.

3

A fault estimation and fault-tolerant control based sliding mode observer for LPV descriptor systems with time delay

Hamdi Habib, Rodrigues Mickael, Rabaoui Bouali, Benhadj Braiek Naceur

International Journal of Applied Mathematics and Computer Science

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2021

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Vol. 31, no. 2

247--258

EN

This paper considers the problem of fault-tolerant control (FTC) and fault reconstruction of actuator faults for linear parameter varying (LPV) descriptor systems with time delay. A polytopic sliding mode observer (PSMO) is synthesized to achieve simultaneous reconstruction of LPV polytopic descriptor system states and actuator faults. Exploiting the reconstructed actuator faults and state estimates, a fault-tolerant controller is designed to compensate the impact of actuator faults on system performance by stabilizing the closed-loop LPV delayed descriptor system. Besides, the controller and PSMO gains are obtained throughout the resolution of linear matrix inequalities (LMIs) using convex optimization techniques. The developed PSMO could force the output estimation error to converge to zero in a finite time when the actuators faults are bounded through the reinjection of the output estimation error via a nonlinear switching term. Simulation results applied to a given numerical system are presented to highlight the superiority and effectiveness of the proposed approach.

4

Comparison of DFOC of Seven-Phase Induction Motor with PI and Fuzzy-Logic speed Controller under speed sensor fault

Listwan Jacek, Pieńkowski Krzysztof

Przegląd Elektrotechniczny

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2020

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R. 96, nr 10

9--13

EN

The paper presents the analysis of the Direct Field-Oriented Control of seven-phase squirrel-cage induction motor with the application of the PI and Fuzzy-Logic controller in the speed control loop and with MRASCC estimator. The encoder failure in the DFOC control system has been analyzed. The mathematical model of the seven-phase induction motor has been presented and the MRASCC estimator has been described. The descriptions of the Space Vector Modulation and Fuzzy-Logic controller have been shown. Results of simulation studies of the Direct Field-Oriented Control methods in the speed sensor fault condition are presented.

PL

W artykule przedstawiono analizę metody bezpośredniego sterowania polowo-zorientowanego siedmiofazowym silnikiem indukcyjnym klatkowym z zastosowaniem regulatora PI i regulatora rozmytego w pętli regulacji prędkości i z zastosowaniem estymatora MRASCC. Analizowano awarię enkodera w układzie sterowania DFOC. Opisano model matematyczny 7-fazowego silnika indukcyjnego i opisano estymator MRASCC. Przedstawiono opis zastosowanej metody modulacji wektorowej i regulatora rozmytego. Przedstawiono wyniki badań symulacyjnych analizowanej metody sterowania w stanie awarii czujnika prędkości.

5

Fault tolerant control of wind turbine via identified fuzzy models prototypes

Djoudi Habib Chaouki Ben, Hafaifa Ahmed, Djoudi Dalila, Guemana Mouloud

Diagnostyka

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2020

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Vol. 21, No. 3

3--13

EN

The main purpose of this study is the comparison of two control strategies of wind turbine 4.8 MW, using fuzzy control and proportional integral control, taking into account eight kinds of faults that can occur in a wind turbine model. A technique based on fault diagnosis has been used to detect and isolate faults actuators and sensors in this system, it's about an observer applied to the benchmark model. The obtained results are presented to validate the effectiveness of this diagnostic method and present the results of the proposed control strategies.

6

Predykcyjny algorytm sterowania napędem z silnikiem indukcyjnym zasilanym z 4-tranzystorowego falownika napięcia

Sobański P., Orłowska-Kowalska T.

Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały

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2014

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Vol. 70, nr 34

59--75

PL

W artykule zaprezentowano predykcyjny algorytm bezpośredniego sterowania strumieniem stojana oraz momentem elektromagnetycznym silnika indukcyjnego zasilanego z 4-tranzystorowego falownika napięcia. Zaproponowana metoda regulacji może być wykorzystana w układach napędowych ze sterowaniem tolerującym uszkodzenia tranzystorów trójfazowego falownika napięcia. Zaletą przedstawionego rozwiązania jest stabilizacja napięć kondensatorów filtru wejściowego falownika napięcia, przy jednoczesnym zachowaniu wysokiej jakości regulacji zmiennych stanu w napędzie. Korzystne właściwości metody wynikają z zastosowanej adaptacji współczynnika wagowego funkcji kosztów sterowania, który reguluje szybkość procesu wyrównywania napięć na kondensatorach. W artykule zdefiniowano sposób strojenia regulatora predykcyjnego oraz zaprezentowano wyniki badań symulacyjnych potwierdzających skuteczność zaproponowanego rozwiązania.

EN

In this paper a finite-state predictive torque and flux control of an induction motor drive fed by four-switch voltage inverter has been presented. The proposed method is dedicated to fault-tolerant control systems that are capable to operate under transistor faults of a three phase voltage inverter. Thanks to a weighting factor adaptation of a term related to an error between DC-link voltages in a cost function of the predictive algorithm, a high quality drive performance is achieved. In the article a tuning procedure of a predictive controller has been developed and proved by simulations.