Journal articles on the topic 'Switch faults'
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1
MAHANI, ALI, DAVOUD AFRASIABI, and HAMID R. NAJI. "A NOVEL FAULT TOLERANT SWITCH FOR RELIABLE NoC DESIGN." Journal of Circuits, Systems and Computers 23, no. 10 (October 14, 2014): 1450142. http://dx.doi.org/10.1142/s0218126614501424.
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Network on chip (NoC) is a design space covered by the manifold combinations of network topology options, routing algorithms, switch architectures, fault tolerant mechanisms and so on. In NoC structures, switches and links are important components on network layers and the effect of faults on links and switches in NoC leads to disturbance in internal communication and low reliability. The performance reduction of many-core NoC architectures depend strongly on the number of faulty switches. This bottleneck motivates us to propose a fault tolerant switch in which the ring roads help the switch to tolerate the faulty ports and also faulty cores. In the proposed scheme, switch ports are connected via redundant ring roads and so the connection with adjacent nodes is not limited to one port. Moreover, if the switch core is defected, the node stays active and cooperates in packet forwarding process. The main advantages of the proposed scheme are tolerating the permanent faults on core and ports of a switch and handling the input traffic of a faulty switch by preventing the congestion around the faulty region. The simulation results verify the robustness of the proposed intelligent switch against various kinds of permanent faults in NoC architectures.
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Parimalasundar, E., R. Senthil Kumar, V. S. Chandrika, and K. Suresh. "Fault diagnosis in a five-level multilevel inverter using an artificial neural network approach." Electrical Engineering & Electromechanics, no. 1 (January 4, 2023): 31–39. http://dx.doi.org/10.20998/2074-272x.2023.1.05.
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Introduction. Cascaded H-bridge multilevel inverters (CHB-MLI) are becoming increasingly used in applications such as distribution systems, electrical traction systems, high voltage direct conversion systems, and many others. Despite the fact that multilevel inverters contain a large number of control switches, detecting a malfunction takes a significant amount of time. In the fault switch configurations diode included for freewheeling operation during open-fault condition. During short circuit fault conditions are carried out by the fuse, which can reveal the freewheeling current direction. The fault category can be identified independently and also failure of power switches harmed by the functioning and reliability of CHB-MLI. This paper investigates the effects and performance of open and short switching faults of multilevel inverters. Output voltage characteristics of 5 level MLI are frequently determined from distinctive switch faults with modulation index value of 0.85 is used during simulation analysis. In the simulation experiment for the modulation index value of 0.85, one second open and short circuit faults are created for the place of faulty switch. Fault is identified automatically by means of artificial neural network (ANN) technique using sinusoidal pulse width modulation based on distorted total harmonic distortion (THD) and managed by its own. The novelty of the proposed work consists of a fast Fourier transform (FFT) and ANN to identify faulty switch. Purpose. The proposed architecture is to identify faulty switch during open and short failures, which has to be reduced THD and make the system in reliable operation. Methods. The proposed topology is to be design and evaluate using MATLAB/Simulink platform. Results. Using the FFT and ANN approaches, the normal and faulty conditions of the MLI are explored, and the faulty switch is detected based on voltage changing patterns in the output. Practical value. The proposed topology has been very supportive for implementing non-conventional energy sources based multilevel inverter, which is connected to large demand in grid.
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Kim, Sang-Hun, Seok-Min Kim, Sungmin Park, and Kyo-Beum Lee. "Switch Open-Fault Detection for a Three-Phase Hybrid Active Neutral-Point-Clamped Rectifier." Electronics 9, no. 9 (September 3, 2020): 1437. http://dx.doi.org/10.3390/electronics9091437.
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This paper proposes a fault-detection method for open-switch failures in hybrid active neutral-point-clamped (HANPC) rectifiers. The basic HANPC topology comprises two SiC-based metal-oxide-semiconductor field-effect transistors (MOSFETs) and four Si insulated-gate bipolar transistors (IGBTs). A three-phase rectifier system using the HANPC topology can produce higher efficiency and lower current harmonics. An open-switch fault in a HANPC rectifier can be a MOSFET or IGBT fault. In this work, faulty cases of six different switches are analyzed based on the current distortion in the stationary reference frame. Open faults in MOSFET switches cause immediate and remarkable current distortions, whereas, open faults in IGBT switches are difficult to detect using conventional methods. To detect an IGBT fault, the proposed detection method utilizes some of the reactive power in a certain period to make an important difference, using the direct-quadrant (dq)-axis current information derived from the three-phase current. Thus, the proposed detection method is based on three-phase current measurements and does not use additional hardware. By analyzing the individual characteristics of each switch failure, the failed switch can be located exactly. The effectiveness and feasibility of the proposed fault-detection method are verified through PSIM simulations and experimental results.
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Puthiyapurayil, Muhammed Ramees Mullali Kunnontakath, Mohamed Nadir Nasirudeen, Yashkumar A. Saywan, Md Waseem Ahmad, and Hasmat Malik. "A Review of Open-Circuit Switch Fault Diagnostic Methods for Neutral Point Clamped Inverter." Electronics 11, no. 19 (October 2, 2022): 3169. http://dx.doi.org/10.3390/electronics11193169.
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Due to numerous advantages, a neutral point clamped (NPC) inverter is a preferred choice for high-power applications and renewable technology. The reliability of the NPC inverter is a major concerning factor during the assessment of system performance as power semiconductor switches are vulnerable to abnormal conditions. Open-circuit (OC) switch faults are not as dangerous as short circuit (SC) faults but eventually have enough potential to cause cascaded failure to other components in the system and thus need to be supervised carefully. The OC faults result in a distortion of voltage and current signals in the NPC converter. Based on these signals, over the past few years, many efforts have been made to identify and localize the OC switch fault to the switch level in the NPC topology. In this paper, a review of different OC switch fault diagnostic methods is provided. Starting from the NPC inverter operation under healthy and faulty conditions, the various possible and unavailable switching states along with the deviation in pole voltage under different switch fault conditions is discussed. Then, based on the approach used for system-based fault detection, the OC fault detection methods are classified. The various OC methods are further discussed on the basis of signal, i.e., current, voltage or a combination of both signals used as a signature for fault detection. Emphasis is given to the principle involved, diagnostic variables utilized, the implementation approach and the diagnostic time required. Finally, the approaches are tabulated so as to provide a quick reference for NPC fault diagnostics.
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Bolbolnia, Rouhollah, Karim Abbaszadeh, and Mojtaba Nasiri. "Diagnosis and Fault-Tolerant Control of Six-Phase Wind Turbine under Multiple Open-Switch Faults." Mathematical Problems in Engineering 2021 (October 7, 2021): 1–16. http://dx.doi.org/10.1155/2021/9999918.
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A new open-switch fault diagnosis method is proposed in this paper for the six-phase AC-DC converter based on the difference between the phase current and the corresponding reference using an adaptive threshold. The single and multiple open-switch faults are detected without any additional equipment and complicated calculations since the proposed fault detection method is integrated with the hysteresis controller. The proposed fault-tolerant technique reduces the value of overcurrent and total harmonic distortion on the side phases of the faulty one, by changing the switching signal of one switch in its opposite phase in some regions. This technique is performed without adding any legs, switches, or triode for alternating currents to the circuit. Finally, the proposed fault-tolerant technique is evaluated by MATLAB simulation and the results show its effectiveness.
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Saeed, Rana Basharat, Mian Hamza Usman, and Arslan Ahmed Amin. "Reliable speed control of a separately excited DC motor using advanced modified triple modular redundancy scheme in H-bridges." Advances in Mechanical Engineering 14, no. 6 (June 2022): 168781322211062. http://dx.doi.org/10.1177/16878132221106289.
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The risk of danger in industries is increasing due to the unexpected shutdowns owing to the unwanted faults in the components. These faults can also lead to a complete failure of the system causing costly production losses and safety issues. Therefore, Fault-Tolerant Control (FTC) techniques are used for such systems to get better reliability, and safety to prevent faults. This paper presents a Modified Triple Modular Redundancy (MTMR) based fault-tolerant system for a separately excited Direct Current (DC) motor with a Fault Detection and Isolation (FDI) unit that can detect, isolate, and replace the faulty switch with the standby switches to prevent the unwanted shut down of the system and support the process continuity thereby increasing reliability. The proposed MTMR will still be able to provide output with only one healthy switch with the other two in the faulty conditions. MATLAB/Simulink software was used for the experimentation process to check the performance of the system. The presented work establishes that the MTMR-based fault-tolerant H-bridge with the FDI unit is a highly reliable solution for the speed control of a separately excited DC motor. The comparison of the proposed work with existing works also demonstrates its superior performance.
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Mahaboob Basha, S., and M. Kannan. "Open switch fault detection technique of a back-to-back converter using NPC topology for turbine systems." International Journal of Engineering & Technology 7, no. 2.12 (April 3, 2018): 359. http://dx.doi.org/10.14419/ijet.v7i2.12.11351.
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Efficiency is turning into more and more necessary in power electronics. New applications are developed to reduce the consumption of en-ergy. Inverters that supply continuous quality power have vast use in solar energy based applications. For a Wind Turbine Generation sys-tem with neutral-point-clamped (NPC) topology in a back to back converter , good efficiency is provided when operated at high power. In NPC topology totally twelve switches are present. Input current distortion, torsion vibration and output current distortion is caused by open switch fault within NPC inverter and rectifier of the consecutive converter. Wind Turbine Generation systems will be erroneous due to such faults. Open-switch fault detection methodology is necessary for consecutive converters for enhancing the output of Wind Turbine Genera-tion systems. Our proposed work checks NPC rectifier and inverter for outer and inner open switch faults. Additionally for all the possible open-switch faults , a novel open-switch fault detection methodology within the back to back converter has been presented in this paper.
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Veerendra, Arigela Satya, Akeel A. Shah, Mohd Rusllim Mohamed, Chavali Punya Sekhar, and Puiki Leung. "Wavelet Transform Based Fault Identification and Reconfiguration for a Reduced Switch Multilevel Inverter Fed Induction Motor Drive." Electronics 10, no. 9 (April 25, 2021): 1023. http://dx.doi.org/10.3390/electronics10091023.
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The multilevel inverter-based drive system is greatly affected by several faults occurring on switching elements. A faulty switch in the inverter can potentially lead to more losses, extensive downtime and reduced reliability. In this paper, a novel fault identification and reconfiguration process is proposed by using discrete wavelet transform and auxiliary switching cells. Here, the discrete wavelet transform exploits a multiresolution analysis with a feature extraction methodology for fault identification and subsequently for reconfiguration. For increasing the reliability, auxiliary switching cells are integrated to replace faulty cells in a proposed reduced-switch 5-level multilevel inverter topology. The novel reconfiguration scheme compensates open circuit and short circuit faults. The complexity of the proposed system is lower relative to existing methods. This proposed technique effectively identifies and classifies faults using the multiresolution analysis. Furthermore, the measured current and voltage values during fault reconfiguration are close to those under healthy conditions. The performance is verified using the MATLAB/Simulink platform and a hardware model.
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Mahafzah, Khaled A., Mohammad A. Obeidat, Ayman M. Mansour, Ali Q. Al-Shetwi, and Taha Selim Ustun. "Artificial-Intelligence-Based Open-Circuit Fault Diagnosis in VSI-Fed PMSMs and a Novel Fault Recovery Method." Sustainability 14, no. 24 (December 9, 2022): 16504. http://dx.doi.org/10.3390/su142416504.
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Artificial intelligence (AI) techniques are widely used in fault diagnosis because they are superior in detection and prediction. The detection of faults in power systems containing electronic components is critical. The switch faults of the voltage source inverter (VSI) have a severe impact on the driving system. Short-circuit switches increase the thermal stress due to their fast and high stator currents. Additionally, open-circuit switches cause unstable motor operation. However, these issues are not sufficiently addressed or accurately predicted for VSI switch faults in the literature. Thus, this paper investigates the use of different AI classifiers for three-phase VSI fault diagnosis. Various AI methods are used, such as naïve Bayes, support vector machine (SVM), artificial neural network (ANN), and decision tree (DT) techniques. These methods are applied to a VSI-fed permanent magnet synchronous motor (PMSM) to detect the faults in the inverter switches. These methods use the drain–source voltage and PWM signals to decide whether the switch is healthy or unhealthy. In addition, they are compared in terms of their detection accuracy. In this regard, the comparative results show that the DT method has the highest accuracy as compared to other methods in the fault diagnosis process. Moreover, this paper proposes a novel and universal voltage compensation loop to compensate for the absence of the voltage portion due to the open switch fault. Thus, the driving system is assisted in operating under its normal operating conditions. The universal term is used because the proposed voltage compensation loop can be implemented in any type of inverter. To validate the results, the proposed system is implemented using two software programs, LTSPICE XVII-USA, WEKA 3.9-New Zealand.
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Vandris, Evstratios, and Gerald Sobelman. "Switch-level Differential Fault Simulation of MOS VLSI Circuits." VLSI Design 4, no. 3 (January 1, 1996): 217–29. http://dx.doi.org/10.1155/1996/34084.
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A new switch-level fault simulation method for MOS circuits is presented that combines compiled switch-level simulation techniques and functional fault modeling of transistor faults with the new fault simulation algorithm of differential fault simulation. The fault simulator models both node stuck-at-0, stuck-at-1 faults and transistor stuck-on, stuck-open faults. Prior to simulation, the switch-level circuit components are compiled into functional models. The effect of transistor faults on the function of the circuit components is modeled by functional fault models that execute very fast during simulation. Every compiled circuit component is assigned a dominance attribute, which abstracts relative strength information in the circuit. Dominance is used during simulation to resolve the X-state due to fighting pull-up and pull-down transistor paths and also to deduce transistor fault detectability and fault equivalencies prior to simulation. The differential fault simulation algorithm developed for gate-level circuits is adapted for use at the switch-level. Differential fault simulation provides excellent performance with minimum memory requirements, although it incurs a higher overhead at the switch-level than at the gate-level due to the dynamic memory properties of MOS circuits.
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E, Parimalasundar, Jayakumar S, Ravikumar R, and Suresh K. "Investigation analysis of open circuit and short circuit fault on cascaded H-bridged multilevel inverter using artificial neural network approach." International Journal of Electrical and Electronics Research 10, no. 2 (June 6, 2022): 320–26. http://dx.doi.org/10.37391/ijeer.100243.
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Cascaded H-bridge multilevel inverters are becoming increasingly used in applications such as distribution systems, electrical traction systems, high voltage direct conversion systems, and many others. Despite the fact that multilevel inverters contain a large number of control switches, detecting a malfunction takes a significant amount of time. In the fault switch configurations diode included for freewheeling operation during open-fault condition. During short circuit fault conditions are carried out by the fuse, which can reveal the freewheeling current direction. The fault category can be identified independently and also failure of power switches harmed by the functioning and reliability of cascaded H-bridge multilevel inverters. This paper investigates the effects and performance of open and short switching faults of multilevel inverters. Output voltage characteristics of five level MLI are frequently determined from distinctive switch faults with modulation index value of 0.85 is used during simulation analysis. In the simulation study, with the modulation index value of 0.85, one second open and short circuit faults are generated for the location of the defective switch. Fault is identified automatically by means of artificial neural network technique using sinusoidal pulse width modulation based on distorted total harmonic distortion and managed by its own. The proposed topology is to be design and evaluate using MATLAB/Simulink platform.
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CHANDRA, ANUJ, and RAMI MELHEM. "RECONFIGURATION IN FAULT-TOLERANT 3D MESHES." Parallel Processing Letters 05, no. 03 (September 1995): 387–99. http://dx.doi.org/10.1142/s0129626495000369.
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The [Formula: see text] track model for fault tolerant 2D processor arrays is extended to 3D mesh architectures. Non-intersecting, continuous, straight and non-near miss compensation paths are considered. It is shown that when six directions in the 3D mesh are allowed for compensation paths, then switches with 13 states are needed to preserve the 3D mesh topology after faults. The number of switch states reduces to 7 if only 3 directions are allowed for compensation paths. It is also shown that switch reconfiguration after faults is local in the sense that the state of each switch is uniquely determined by the states of the 2 processors connected to it.
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Varalakshmi, K., Narasimham R.L., and G. Tulasi Ramdas. "Eccentric operation of STATCOM using Predictive Controller." International Journal of Power Electronics and Drive Systems (IJPEDS) 9, no. 1 (March 1, 2018): 150. http://dx.doi.org/10.11591/ijpeds.v9.i1.pp150-156.
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<p>The impact of multilevel converter STATCOM in transmission and distribution system is given high importance. Increment of number of switches in multi-level cascaded H-bridge converter, made it more vulnerable to open circuit and short circuit faults. To reduce the effect of faults on line voltage magnitude, in this paper an advanced improved predictive controller is used to generate PWM pulses for the power electronic devices. A Cascaded H-bridge STATCOM, interconnected to a distribution system with linear and non-linear loads. The feedback control structure of STATCOM has an advantage of reducing THD and controllable reactive power. A switch fault detection and elimination method is proposed with a bypass switch connected to each H-bridge to surpass the faulty H-bridge. The complete analysis with all control structures is designed in MATLAB/Simulink representing dynamic graphs and feasibility of proposed method is verified.</p>
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Kherif, Omar, Tahar Zebbadji, Youcef Gherbi, Mohamed Larbi Azzouze, and Madjid Teguar. "Simplified Diagnosis Method for CHBMIs under Open-circuit Switch or Battery Failure." ENP Engineering Science Journal 1, no. 2 (December 31, 2021): 17–25. http://dx.doi.org/10.53907/enpesj.v1i2.23.
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This paper deals with the diagnosis of cascaded H-bridge multilevel inverters controlled by a sinusoidal level-shifted pulse-width modulation technique. For this purpose, the behaviour of 3, 5, 7 and 9-level inverters is studied for regular and faulty operation modes. Three types of recurring faults are considered, namely open-circuit of a switch, damaged and disconnected battery. Under a single fault, the output voltage signals are presented where the impact of each fault is discussed. In order to detect, identify and locate the three types of fault, a signal processing method is proposed, elaborating the output voltage of inverters with and without fault. The obtained results are convincing for the considered cases. The study shows no real correlation between the selected features from one to the other type of fault. Indeed, each fault type has its own trajectory with respect to the evolution of the output voltage characteristics. Thus, localizing the faulty component within the multilevel inverter can be made with no ambiguity. Such findings obviously solve a large part of problems associated with the presence of faults in multilevel inverters. They can help improving the reliability of the inverter in such way it continues working.
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Cheng, Shu, Jundong Zhao, Chunyang Chen, Kaidi Li, Xun Wu, Tianjian Yu, and Yongsheng Yu. "An open-circuit fault-diagnosis method for inverters based on phase current." Transportation Safety and Environment 2, no. 2 (June 2020): 148–60. http://dx.doi.org/10.1093/tse/tdaa008.
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Abstract The inverter is an indispensable part of a power electronics system. Its safety and stability are important indicators for evaluating the reliability of the system. Inverter faults are usually caused by operating faults in the switch elements. This paper therefore proposes a non-intrusive fault-diagnosis method for open-circuit faults in inverter semiconductor power switches. This method requires only a current signal. It is simple and economical. Faults can be diagnosed quickly using the proposed algorithm. First, the phase current waveforms before and after the open-circuit fault are analysed based on the mathematical model. Then, based on the analysis of the phase currents, the fault features are extracted and the fault is located using the proposed integration algorithm. Finally, the effectiveness and reliability of the proposed fault-diagnosis method are verified using a hardware-in-the-loop experiment.
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Abid, M., S. Laribi, M. Larbi, and T. Allaoui. "Diagnosis and localization of fault for a neutral point clamped inverter in wind energy conversion system using artificial neural network technique." Electrical Engineering & Electromechanics, no. 5 (September 6, 2022): 55–59. http://dx.doi.org/10.20998/2074-272x.2022.5.09.
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Introduction. To attain high efficiency and reliability in the field of clean energy conversion, power electronics play a significant role in a wide range of applications. More effort is being made to increase the dependability of power electronics systems. Purpose. In order to avoid any undesirable effects or disturbances that negatively affect the continuity of service in the field of energy production, this research provides a fault detection technique for insulated-gate bipolar transistor open-circuit faults in a three-level diode-clamped inverter of a wind energy conversion system predicated on a doubly-fed induction generator. The novelty of the suggested work ensures the regulation of power exchanged between the system and the grid without faults, advanced intelligence approaches based on a multilayer artificial neural network are used to discover and locate this type of defect; the database is based on the module and phase angle of three-phase stator currents of induction generators. The proposed methods are designed for the detection of one or two open-circuit faults in the power switches of the side converter of a doubly-fed induction generator in a wind energy conversion system. Methods. In the proposed detection method, only the three-phase stator current module and phase angle are used to identify the faulty switch. The primary goal of this fault diagnosis system is to effectively detect and locate failures in one or even more neutral point clamped inverter switches. Practical value. The performance of the controllers is evaluated under different operating conditions of the power system, and the reliability, feasibility, and effectiveness of the proposed fault detection have been verified under various open-switch fault conditions. The diagnostic approach is also robust to transient conditions posed by changes in load and speed. The proposed diagnostic technique's performance and effectiveness are both proven by simulation in the SimPower /Simulink® MATLAB environment.
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Koo, Geun Wan, DongMyoung Joo, and Byoung Kuk Lee. "Enhanced Threshold Point Calculation Algorithm for Switch Fault Diagnosis in Grid Connected 3-Phase AC–DC PWM Converters." Energies 12, no. 10 (May 23, 2019): 1979. http://dx.doi.org/10.3390/en12101979.
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The resilience of systems with alternating current (AC)–direct current (DC) converters has been investigated with the aim of improving switch fault diagnosis. To satisfy this aim, this paper proposes a switch fault diagnosis algorithm for three-phase AC–DC converters. The proposed algorithm operates using the phase current instead of the average current to reduce the calculation time required for fault switch detection. Moreover, a threshold point calculation method is derived using a theoretical analysis, which was lacking in previous research. Using the calculated threshold point, a switch fault diagnosis algorithm is obtained to detect faults independent of the load condition. Using the proposed algorithm, switch faults can be detected within 4 ms, which is the recommended value for uninterruptible power supply (UPS). The theoretical analysis, the operating principle, and the experimental results on a 3-kW grid-tied AC–DC converter test-bed are presented herein, which verify the performance of the proposed algorithm.
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Manap, Mustafa, Srete Nikolovski, Aleksandr Skamyin, Rony Karim, Tole Sutikno, and Mohd Hatta Jopri. "An analysis of voltage source inverter switches fault classification using short time Fourier transform." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 4 (December 1, 2021): 2209. http://dx.doi.org/10.11591/ijpeds.v12.i4.pp2209-2220.
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<p>The dependability of power electronics systems, such as three-phase inverters, is critical in a variety of applications. Different types of failures that occur in an inverter circuit might affect system operation and raise the entire cost of the manufacturing process. As a result, detecting and identifying inverter problems for such devices is critical in industry. This study presents the short-time Fourier transform (STFT) for fault classification and identification in three-phase type, voltage source inverter (VSI) switches. TFR represents the signal analysis of STFT, which includes total harmonic distortion, instantaneous RMS current, RMS fundamental current, total non harmonic distortion, total waveform distortion and average current. The features of the faults are used with a rule-based classifier based on the signal parameters to categorise and detect the switch faults. The suggested method's performance is evaluated using 60 signals containing short and open circuit faults with varying characteristics for each switch in VSI. The classification results demonstrate the proposed technique is good to be implemented for VSI switches faults classification, with an accuracy classification rate of 98.3 percent.</p>
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Shen, Yu, Wei Hu, Yaoyao Xiao, Ganghua Zhang, Mingyu Han, Fan Yang, and Wenping Zuo. "Mechanical Switch Based Adaptive Fault Ride-through Strategy for Power Quality Improvement Device." Energies 14, no. 20 (October 14, 2021): 6623. http://dx.doi.org/10.3390/en14206623.
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Cascaded H-bridge power quality improving device (PQID) has garnered extensive attention for its flexible electric energy conversion and fast voltage response. However, the failure rate of PQID is relatively high due to the use of large numbers of power electronic devices. This paper proposes a mechanical-switch based adaptive fault ride-through strategy for improving the operational stability and power supply reliability of PQID. According to the features of the topology and working principle of PQID, this paper summarized the types of internal faults and analyzed the characteristics of different types of faults. Based on the shortcomings of existing mechanical switches as a bypass method, corresponding adaptive fault ride-through strategies are proposed for different types of faults, and a comprehensive simulation test has been carried out. The results show that the proposed strategy can adaptively ride through unit faults and effectively improve the output waveform quality during the ride through time.
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Zhang, Zhen, Zhe Ming Duan, and Ying Long. "A Study of Kurtosis-Based Dictionary-Diagnosis Method against Switch-Current Circuit Faults." Applied Mechanics and Materials 705 (December 2014): 199–203. http://dx.doi.org/10.4028/www.scientific.net/amm.705.199.
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For the purpose of solving the problem of diagnosing the Switched current circuits’ fault,a location algorithm based on information kurtosis was proposed.Data acquisition board or ASI-Z software was used to gather the data of the fault circuit output terminal.Then information Kurtosis of the Switched current circuit time domain response was calculated.Finally fault dictionary was built to classify faults.The location algorithm was simulated in a practical circuit.The results show that the location algorithm is use to simplify the structure of fault dictionary,and classify the faults,and it is applicable to diagnosising switch current circuit fault.
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Ahmed, Soban, Arslan Ahmed Amin, Zaeema Wajid, and Faizan Ahmad. "Reliable speed control of a permanent magnet DC motor using fault-tolerant H-bridge." Advances in Mechanical Engineering 12, no. 10 (October 2020): 168781402097031. http://dx.doi.org/10.1177/1687814020970311.
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Reliable, smooth, and fault free speed control of a Permanent Magnet (PM) DC motor using an H-bridge is an important need for many industrial applications such as robotics, automotive, and process industry to improve the overall efficiency and productivity. The reliability of H-bridge depends on the semiconductor switches used. The faults in these components can lead to a complete failure of the system. This paper presents a dual redundancy-based fault-tolerant system with a Fault Detection and Isolation (FDI) unit that can detect, isolate, and replace the faulty switch with the standby to prevent the unwanted shut down of the system and support the process continuity thereby increasing reliability. MATLAB/Simulink environment was used for simulation experiments and the results demonstrate the stable operation of the motor in the events of faults while maintaining its speed. The presented work establishes that the dual redundancy-based fault-tolerant H-bridge with the FDI unit is a highly reliable solution for the speed control of a DC motor.
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Khan, Faisal A., Mohammad Munawar Shees, Mohammed F. Alsharekh, Saleh Alyahya, Faisal Saleem, Vipul Baghel, Adil Sarwar, Muhammad Islam, and Sheroz Khan. "Open-Circuit Fault Detection in a Multilevel Inverter Using Sub-Band Wavelet Energy." Electronics 11, no. 1 (December 30, 2021): 123. http://dx.doi.org/10.3390/electronics11010123.
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Recent research has focused on sustainable development and renewable energy resources, thus motivating nonconventional cutting-edge technology development. Multilevel inverters are cost-efficient devices with IGBT switches that can be used in ac power applications with reduced harmonics. They are widely used in the power electronics industry. However, under extreme stress, the IGBT switches can experience a fault, which can lead to undesirable operation. There is a need for a reliable system for detecting switch faults. This paper proposes a signal processing method to detect open-circuit problems in IGBT switches. Relative wavelet energy has been used as a feature for a machine learning algorithm to diagnose and classify the faulted switches. The switching sequence can be altered to restore a healthy output voltage. Inverter faults have been diagnosed by using support vector machine (SVM) and decision tree (DT), and an ensemble model based on decision tree (DT) and XG boost algorithm was developed, which yielded 92%, 88%, and 94.12% accuracy, respectively.
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Youns, Yasir Mohammed, and Omer Mohammad Hassan. "Performances Analysis of SPWM Inverter-Fed Three Phase Induction Motor during Fault Conditions." Tikrit Journal of Engineering Sciences 24, no. 4 (December 1, 2017): 88–94. http://dx.doi.org/10.25130/tjes.24.4.11.
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Induction motors are the most widely used electrical machines and the most popularly in the industrial applications, aerospace, and electrical vehicles or hybrid electrical vehicles. This celebrity of these machines because of some of their benefits such as: relatively low manufacturing cost, robust construction, moderate power factor, ability to operate in hostile environments, good reliability, and ease of control especially in the recent years. In fact, induction motors are the main component of many of these applications and they are used in the most of these applications with their power electronic drivers in order to control their speeds, torques, or control their starting conditions. However, these motors and their drivers may encounter several faults due to operating conditions. In fact, these faults are either due to the motor itself or due to its power electronic driver circuit. Therefore, this paper presents the performance analysis and simulation of a Sinusoidal pulse width Modulation (SPWM) inverter-fed three-phase induction motor under some fault conditions. Two different types of faults are studied and analyzed in detail. These faults were: driver single switch short circuit fault, and driver single switch open circuit fault. The motor currents and voltages at pre-fault and post-fault conditions are presented and investigated. In the two fault cases, the motor phase currents are changed and increased, but in different ratios, under same load conditions. Also, decreasing and oscillating in both motor speed and its developed torque are occurred due to these faults. The simulation and analysis results show that the single switch short circuit fault has the sever effect on the motor performance, therefore especial care should be taken under this fault conditions.
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MENDAZ, Kheira, Mohamed FLITTI, Yamina BENHADDA, Amine ATTOU, and Abdelber BENDAOUD. "Effect of Defective Five Levels Inverter on Input Output Linearization Control for Induction Motor." Electrotehnica, Electronica, Automatica 70, no. 4 (November 15, 2022): 30–45. http://dx.doi.org/10.46904/eea.22.70.4.1108004.
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Induction Motor (IM) speed control is an area of research that has been in prominence for some time now. In this paper, a nonlinear controller is presented for induction motor drives. The nonlinear controller is designed based on input-output feedback linearization control technique. The input-output feedback linearization control decouples the flux control from the speed control and makes the synthesis of linear controllers possible. This article presented input output linearization control for induction motor associated with NPC three levels inverter defective, the inverter faults are usually caused by operating faults in the switch elements. Switching faults occur in rectifier diodes, the capacitor and IGBT switches of the inverter. The inverter switches defected reduce the performance of the motor, in our study , we apply the input-output linearization control to test their robustness and performance for detection of fault influence on the physical parameters of the motor, for this purpose we apply two faults, we start by creating a fault in two switches K1 and K7 which have in the first and second arm of the inverter then we create a faults in the three switches K1, K7 and K10 which are in the three arms of the inverter. The simulations results are done by the use of MATLAB/Simulink that show the detection fault effect by input output linearization control on the different induction motor responses.
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Touaiti, Bilel, Hechmi Ben Azza, Mongi Moujahed, and Mohamed Jemli. "Fault-Tolerant Voltage Source Converter for Wind-Driven Doubly Fed Induction Generator Connected to a DC Load." Journal of Circuits, Systems and Computers 27, no. 10 (May 24, 2018): 1850153. http://dx.doi.org/10.1142/s0218126618501530.
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This paper presents a fault-tolerant Voltage Source Converter (VSC) for Field Oriented Control (FOC) of a stand-alone Doubly Fed Induction Generator (DFIG) connected to a DC load. In the proposed topology, the stator of the DFIG is connected to a DC load through a diode rectifier, while the rotor is connected to the DC load through a VSC. This topology allows the integration of DFIG in the hybrid system with other sources of production and storage, such as photovoltaic system, connected to the same DC bus. The fault-tolerant VSC consists in incorporating a fourth leg to replace the faulted leg. A fault detection scheme for switch device open-circuit faults is proposed in this study. The novelty of this method consists in analyzing the rotor currents within normal and faulty operating modes. Simulation results are presented for a 3.7[Formula: see text]kW DFIG-DC system with single open-circuit faults that validate the methods presented in this study. The effectiveness of the proposed fault detection method has been validated experimentally by using dSpace DS1104 control board based on TMS320F240 real time Digital Signal Processor (DSP).
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Kadri, Farid, and Mohamed A. Hamida. "Neural Direct Torque Control for Induction Motor under Voltage Source Inverter Open Switch Fault." Recent Advances in Electrical & Electronic Engineering (Formerly Recent Patents on Electrical & Electronic Engineering) 13, no. 4 (July 5, 2020): 571–79. http://dx.doi.org/10.2174/1874476105666190830103616.
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Background: The study of induction motor behavior during abnormal conditions due to the presence of faults and the possibility to diagnose these abnormal conditions has been a challenging topic for many electrical machine researchers. Objective: Direct Torque Control (DTC) is applied to the control of an induction motor in healthy and an open circuit fault in the PWM three phase voltage fed inverter. Neural DTC is developed and used to improve the dynamic behavior of the drive system under faulty switch occurrence. Methods: The validity of the proposed control scheme is tested under normal conditions and switching fail in the Voltage Source Inverter (VSI) caused by an open circuit. Through a simulation testing of an induction motor drive system at different speed references, a comparison between basic DTC and Neural DTC is performed. Results: Simulated results on 1.5-kW induction motor drive show the performance of the proposed control in normal and faulty cases. The stator current, flux, torque, and speed at different references are determined and compared in the above techniques using MATLAB-SIMULINK. Conclusion: A Neural Network (NN) DTC control system under an open switch fault is proposed without the need for classical switching table. The use of hybrid intelligent techniques aims to improve the DTC performances in case of multiple faults occurrence.
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Chen, Zhiheng, Ting Yuan, Mingfang Xu, Yang Yu, Zhen Xie, and Yuchen Liu. "Research on Fault Diagnosis of Switchgear Based on Temperature Cloud Image Technology." IOP Conference Series: Earth and Environmental Science 1044, no. 1 (June 1, 2022): 012007. http://dx.doi.org/10.1088/1755-1315/1044/1/012007.
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Abstract In the process of power system operation, contact aging, partial discharge and overcurrent faults are the main causes of switch cabinet faults. At the same time, it is difficult to install sensors inside the switch cabinet due to its closed operation. In this paper, in order to solve the over current problem of switchgear, according to the principle of high current heating, the thermal flow model of power switchgear is established, and the characteristics of heat flow inside the switchgear are studied. The infrared temperature detector is designed to collect the surface temperature cloud map of the switchgear. Combined with the internal heat flow law of the switchgear, the over current phenomenon in the switchgear is judged, so as to judge the operation state of the switchgear. In order to verify the correctness of the theory proposed in this paper, the operation state of the fault switch cabinet is designed for detection and comparative analysis. The test results show that the heat change caused by the over-current fault can be accurately fed back to the surface of the switch cabinet, which can be used as an effective means to diagnose the fault of the switch cabinet.
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Zhang, Jie, Na Zhang, Xu Ming Zhu, Yong Guan, and Yong Mei Liu. "A Survey of Diagnosis Method for Interconnect in SRAM-Based FPGAs." Key Engineering Materials 474-476 (April 2011): 1949–54. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.1949.
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To further improve the fault coverage and accuracy of fault location in SRAM based on FPGAs interconnect, an efficient method of fault detection and location is presented. Eight types of programming based on multiple times programmable FPGA is used, and further improved fault coverage and accuracy of fault location. Analysis showed that the proposed methods could cover all interconnect single faults and locate five single faults to specific switch or locate bridge fault to a pair of segments.
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Mimouni, A., S. Laribi, M. Sebaa, T. Allaoui, and A. A. Bengharbi. "Fault diagnosis of power converters in a grid connected photovoltaic system using artificial neural networks." Electrical Engineering & Electromechanics, no. 1 (January 4, 2023): 25–30. http://dx.doi.org/10.20998/2074-272x.2023.1.04.
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Introduction. The widespread use of photovoltaic systems in various applications has spotlighted the pressing requirement for reliability, efficiency and continuity of service. The main impediment to a more effective implementation has been the reliability of the power converters. Indeed, the presence of faults in power converters that can cause malfunctions in the photovoltaic system, which can reduce its performance. Novelty. This paper presents a technique for diagnosing open circuit failures in the switches (IGBTs) of power converters (DC-DC converters and three-phase inverters) in a grid-connected photovoltaic system. Purpose. To ensure supply continuity, a fault-diagnosis process is required throughout all phases of energy production, transfer, and conversion. Methods. The diagnostic approach is based on artificial neural networks and the extraction of features corresponding to the open circuit fault of the IGBT switch. This approach is based on the Clarke transformation of the three-phase currents of the inverter output as well as the calculation of the average value of these currents to determine the exact angle of the open circuit fault. Results. This method is able to effectively identify and localize single or multiple open circuit faults of the DC-DC converter IGBT switch or the three-phase inverter IGBT switches.
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Das, Partha Sarati, and Kyeong-Hwa Kim. "Open-Switch Fault-Tolerant Control of a Grid-Side Converter in a Wind Power Generation System." International Journal of Power Electronics and Drive Systems (IJPEDS) 6, no. 2 (June 1, 2015): 293. http://dx.doi.org/10.11591/ijpeds.v6.i2.pp293-304.
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A fault-tolerant technique of a grid-side converter (GSC) is a very important task because the unbalanced grid power endangers the overall system. Since the GSC is very sensitive to grid disturbance, the complete system needs to be stopped suddenly once an open-switch fault occurs. To improve the reliability of system, the continuous operation should be guaranteed. In this paper, a redundant topology based fault-tolerant algorithm is proposed for a GSC in a wind power generation system. The proposed scheme consists of the fault detection and fault-tolerant algorithms. The fault detection algorithm employs the durations of positive and negaitive cycles of three-phase grid currents as well as normalized root mean square (RMS) currents. Once a fault is detected, the corresponding faulty phase is identified and isolated to enable the fault-tolerant operation. The faulty phase is replaced by redundant one rapidly to recover the original shape of the grid currents, which ensures the continuity in operation. In contrast with the conventional methods, the proposed fault detection and fault-tolerant algorithms work effectively even in the presence of the open faults in multiple switches in the GSC. Simulation results verify the effectiveness of the proposed fault diagnosis and fault-tolerant control algorithms.
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Hari Kumar Raveendran Pillai, Mayadevi Nanappan, Mini Valiyakulam Prabhakaran, and Shenil Pushpangadan Sathyabhama. "A Robust Technique for Detection, Diagnosis, and Localization of Switching Faults in Electric Drives Using Discrete Wavelet Transform." International Journal of Engineering and Technology Innovation 13, no. 1 (January 1, 2023): 14–27. http://dx.doi.org/10.46604/ijeti.2023.10005.
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Detection, diagnosis, and localization of switching faults in electric drives are extremely important for operating a large number of induction motors in parallel. This study aims to present the design and development of switching fault detection, diagnosis, and localization strategy for the induction motor drive system (IMDS) by using a novel diagnostic variable that is derived from discrete wavelet transform (DWT) coefficients. The distinctiveness of the proposed algorithm is that it can identify single/multiple switch open and short faults and locate the defective switches using a single mathematical computation. The proposed algorithm is tested by simulation in MATLAB/Simulink and experimentally validated using the LabVIEW hardware-in-the-loop platform. The results demonstrate the robustness and effectiveness of the proposed technique in identifying and locating faults.
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Bhardwaj, Ved Prakash, and Nitin. "Message Broadcasting via a New Fault Tolerant Irregular Advance Omega Network in Faulty and Nonfaulty Network Environments." Journal of Electrical and Computer Engineering 2013 (2013): 1–16. http://dx.doi.org/10.1155/2013/568780.
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Interconnection Network (IN) is a key element for all parallel processing applications. Multistage Interconnection Network (MIN) is an efficient IN for these applications, as it has the quality of excellent performance at low cost with high reliability. MINs are effective medium for message broadcasting. Doing the same task in faulty situations is a critical challenge. In this paper, we have presented a new Fault Tolerant Interconnection Network named as Irregular Advance Omega Network (IAON); also we have presented its routing algorithm. IAON is the modified form of Advance Omega Network. The proposed MIN can endure multiple faults and provides a suitable path between every source to every destination. We have examined the fault tolerance capacity of IAON and compared its performance with other existing MINs. In order to check the performance of proposed MIN, message broadcasting was performed in three conditions as follows: (1) when network was fault free; (2) when network was Single Switch Faulty in every stage; (3) when network was Double Switch Faulty in every stage. Results showed that IAON performed better than the earlier proposed MINs.
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Islam, Saif, Kamran Zeb, Waqar Din, Imran Khan, Muhammad Ishfaq, Tiago Busarello, and Hee Kim. "Design of a Proportional Resonant Controller with Resonant Harmonic Compensator and Fault Ride Trough Strategies for a Grid-Connected Photovoltaic System." Electronics 7, no. 12 (December 19, 2018): 451. http://dx.doi.org/10.3390/electronics7120451.
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This paper presents the design and analysis of a proportional resonant controller with a resonant harmonic compensator and switch-type fault current limiter, as a fault-ride through strategy for a three-phase, grid-connected photovoltaic (PV) system under normal conditions and asymmetrical faults. The switch-type fault limiter comprised of current-limiting inductors, a bridge rectifier, a snubber capacitor, linear transformers, and energy absorption bypass. Furthermore, a critical and analytical comparison of switch-type fault limiters is carried out, with the conventional crowbar as the fault-ride through strategy, in combination with a conventionally tuned proportional integrator controller. The designed fault-ride through strategies with proportional integrator and proportional resonant controllers with resonant harmonic compensators are tested at the point of common coupling of the photovoltaic system and at a distance of 19 km from the point of common coupling, in order to analyze the impacts of fault parameter with respect to location. A MATLAB/Simulink model of a 100 kW three-phase grid-connected photovoltaic system is used for analysis. The simulation results of the proposed switch-type fault limiter with proportional resonant controller effectively validate the stable, ripple-free, and robust response compared to all other configurations. In addition, it is also verified that the grid faults on the PV system have a significant impact on fault type, and less impact on fault location.
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Li, Meng Nan, Ping Qian, Wen Rui Wang, and Yin Zhong Ye. "Fault Analysis and Position of the Tree-Phase Grid-Connection Inverter." Applied Mechanics and Materials 568-570 (June 2014): 1177–81. http://dx.doi.org/10.4028/www.scientific.net/amm.568-570.1177.
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The theory, design, implementation and experimental validation of a neural network based diagnosis method for open-switch faults in the three-phase grid-connection inverter are discussed. The model of three-phase grid-connection inverter are established with Matlab/Simulink. The feature value of output current wave of the inverter is extracted under various kinds of open-switch faulty conditions in the inverter with the FFT method and wavelet analysis method. The experimental results show the flexible and double domain superiority of the wavelet analysis. Finally, the design takes advantage of the extraction as learning and training samples, puts forward a new method of locating fault for three-phase grid connection inverter based on neural network structure. The simulation results show that the method can locate the fault device exactly and distinguish multiple fault modes. The experiment illustrates the effectiveness of the method.
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Jamshidpour, Ehsan, Philippe Poure, and Shahrokh Saadate. "Common Switch Fault Diagnosis for Two-Stage DC-DC Converters Used in Energy Harvesting Applications." Electronics 8, no. 3 (March 5, 2019): 293. http://dx.doi.org/10.3390/electronics8030293.
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This paper proposes a new Unified Switch Fault Diagnosis (UFD) approach for two-stage non-isolated DC-DC converters used in energy harvesting applications. The proposed UFD is compared with a switch fault diagnosis consisting of two separate fault detection algorithms, working in parallel for each converter. The proposed UFD is simpler than the two parallel fault diagnosis methods in realization. Moreover, it can detect both types of switch failures, open circuit and short circuit switch faults. It can also be used for any two-stage non-isolated DC-DC converters based on two single switch converters, no matter the converter circuits in each stage. Some selected simulation and Hardware-in-the-Loop (HIL) experimentation results confirm the validity and efficiency of the proposed UFD. Also, the proposed UFD is applied successfully for fault-tolerant operation of a buck/buck–boost two-stage converter with synchronous control and a redundant switch.
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Ye, Hang, Xiao Jin Fu, Zhou Yun Zhang, Chun Lan Que, and Hao Xiao. "The Electric Vehicle Drive System Considering Current Sensor Fault." Applied Mechanics and Materials 738-739 (March 2015): 140–43. http://dx.doi.org/10.4028/www.scientific.net/amm.738-739.140.
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This paper proposes an algorithm of electric vehicle drive system when any current sensor fault. Reconstruct rough stator current by decomposing the DC current. Test whether any sensor fault by comparing the rough reconstructions and measured stator currents.Switch to the reconstructed stator current after corrected from the fault current when a stator sensor faults. Switch to the reconstructed DC current from the fault current when the DC sensor faults. Simulation result verifies the effectiveness of detecting the fault and keeping electric vehicle operation normal.
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Pires, Vitor, Daniel Foito, Armando Cordeiro, Miguel Chaves, and Armando Pires. "PV Generator-Fed Water Pumping System Based on a SRM with a Multilevel Fault-Tolerant Converter." Energies 15, no. 3 (January 19, 2022): 720. http://dx.doi.org/10.3390/en15030720.
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This paper presents a pumping system supplied by a PV generator that is based on a switched reluctance machine (SRM). Water pumping systems are fundamental in many applications. Most of them can be used only during the day; therefore, they are highly recommended for use with PV generators. For the interface between the PV panels and the motor, a new multilevel converter is proposed. This converter is designed in order to ensure fault-tolerant capability for open switch faults. The converter is based on two three-level inverters, with some extra switches. Moreover, to reduce the number of switches, the converter is designed to provide inverse currents in the motor windings. Due to the characteristics of this motor, the inverse currents do not change the torque direction. In this way, it was possible to obtain an SRM drive with fault-tolerant capability for transistor faults; it is also a low-cost solution, due to the reduced number of switches and drives. These characteristics of fault-tolerant capability and low cost are important in applications such as water pumping systems supplied by PV generators. The proposed system was verified by several tests that were carried out by a simulation program. The experimental results, obtained from a laboratory prototype, are also presented, with the purpose of validating the simulation tests.
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Kheira, Mendaz, Benhadda Yamina, and Bounoua Houria. "Effect of defective NPC three level inverter on nonlinear command of induction motor." Serbian Journal of Electrical Engineering 19, no. 2 (2022): 167–92. http://dx.doi.org/10.2298/sjee2202167k.
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Speed Induction Motor (IM) control is an area of research that has been in evidence for some time now. In this paper, a nonlinear controller is presented for the induction motor drives. The nonlinear controller is designed based on an input-output feedback linearization control technique. The input-output feedback linearization control decouples the flux from the speed control and makes the synthesis of linear controllers possible. This article presented input-output linearization control of the induction motor associated with NPC three level inverter defective, the inverter faults are usually caused by operating faults in the switch elements. Switching defects occur in rectifier diodes, the capacitor and inverter IGBT switches. The inverter switches defected reduce the performance of the motor, in our study. We applied the input-output linearization control to test their robustness and performance for detection of fault influence on the physical parameters of the motor, for this purpose, we applied two faults, we started by creating a fault in two switches K1 and K7 which are in the first and second arm of the inverter. Then we created a fault in the three switches K1, K7 and K10 which are in the three arms of the inverter. The simulation results are done by the use of Matlab/Simulink that show the detection, fault effect on input-output linearization control of the different induction motor responses.
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Murillo-Soto, Luis D., and Carlos Meza. "Automated Fault Management System in a Photovoltaic Array: A Reconfiguration-Based Approach." Energies 14, no. 9 (April 23, 2021): 2397. http://dx.doi.org/10.3390/en14092397.
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This work proposes an automated reconfiguration system to manage two types of faults in any position inside the solar arrays. The faults studied are the short-circuit to ground and the open wires in the string. These faults were selected because they severely affect power production. By identifying the affected panels and isolating the faulty one, it is possible to recover part of the power loss. Among other types of faults that the system can detect and locate are: diode short-circuit, internal open-circuit, and the degradation of the internal parasitic serial resistance. The reconfiguration system can detect, locate the above faults, and switch the distributed commutators to recover most of the power loss. Moreover, the system can return automatically to the previous state when the fault has been repaired. A SIMULINK model has been built to prove this automatic system, and a simulated numerical experiment has been executed to test the system response to the faults mentioned. The results show that the recovery of power is more than 90%, and the diagnosis accuracy and sensitivity are both 100% for this numerical experiment.
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Li, Jian Hu, Man Bok Park, and Hun Mo Kim. "The Fault Tolerant Output Selector Based on Fault-Detection Considering Realistic Fault Modes for Pedal Simulator of Brake-by-Wire System." Applied Mechanics and Materials 284-287 (January 2013): 1946–50. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.1946.
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A brake pedal simulator in a Brake-by-Wire system is studied for fault tolerant control of the brake pedal signals. This study is conducted for the pedal simulator installed with a sensor that generates two analogue signals. Several realistic fault modes recognized by automotive experts have been analyzed. To solve the fault modes, we propose a fault tolerant output selector that can handle transient, intermittent, or permanent faults. The fault tolerant output selector, based on a fault detection algorithm, uses the BLS(brake light switch) signal and the Acc(acceleration pedal) signal to find faults and isolate them. To confirm the system performance, the fault modes were simulated. The result showed the reliability and safety of the pedal simulator for dealing with unexpected faults.
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Yepes, Alejandro G., Ignacio Gonzalez-Prieto, Oscar Lopez, Mario J. Duran, and Jesus Doval-Gandoy. "A Comprehensive Survey on Fault Tolerance in Multiphase AC Drives, Part 2: Phase and Switch Open-Circuit Faults." Machines 10, no. 3 (March 21, 2022): 221. http://dx.doi.org/10.3390/machines10030221.
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Multiphase machines are very convenient for applications that require high reliability. In this two-part survey, the state of the art about fault tolerance in multiphase drives is reviewed. In Part 1, an overview including numerous fault types was presented, along with fundamental notions about multiphase drives. Here, in Part 2, the focus is placed on phase/switch open-circuit (OC) faults in particular, which have received the most attention in the literature. Phase OC failures involve OCs in stator phases or in converter-machine connections, and switch/diode OCs are frequently dealt with similarly or identically. Thanks to the phase redundancy of multiphase drives, their operation can be satisfactorily continued under a certain number of OCs. Nonetheless, the procedure to follow for this purpose is far from unique. For given OC fault conditions, numerous fault-tolerant possibilities can be found in the literature, each of them with different advantages and disadvantages. Moreover, a great variety of methods have also been devised to detect and diagnose phase/switch OC failures so that, as soon as possible, the most appropriate fault-tolerance measures are applied. Thus, given the broad literature about tolerance to phase/switch OC faults in multiphase drives, the survey presented here is expected to be of great interest for the research community and industry.
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Zhang, Che, Hong Xu, Libin Liu, Zhixiong Niu, and Peng Wang. "Kuijia: Traffic Rescaling in Software-Defined Data Center WANs." Security and Communication Networks 2018 (2018): 1–12. http://dx.doi.org/10.1155/2018/6361901.
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Network faults like link or switch failures can cause heavy congestion and packet loss. Traffic engineering systems need a lot of time to detect and react to such faults, which results in significant recovery times. Recent work either preinstalls a lot of backup paths in the switches to ensure fast rerouting or proactively prereserves bandwidth to achieve fault resiliency. Our idea agilely reacts to failures in the data plane while eliminating the preinstallation of backup paths. We propose Kuijia, a robust traffic engineering system for data center WANs, which relies on a novel failover mechanism in the data plane called rate rescaling. The victim flows on failed tunnels are rescaled to the remaining tunnels and enter lower priority queues to avoid performance impairment of aboriginal flows. Real system experiments show that Kuijia is effective in handling network faults and significantly outperforms the conventional rescaling method.
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Sun, Guodong, Guijie Yang, Yanyi Wang, and Jianyong Su. "Unified Fault-tolerant Control Strategy with Torque Ripple Compensation for Five-phase Permanent Magnet Synchronous Motor Based on Normal Decoupling." Energies 12, no. 6 (March 22, 2019): 1127. http://dx.doi.org/10.3390/en12061127.
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In this paper, the decoupling matrix in a five-phase permanent magnet synchronous motor (FPMSM) is rebuilt and changed, according to different open-phase conditions, which complicate the switch and control algorithm. This paper proposes a unified fault-tolerant control strategy with decoupling transformation matrix, effectively suppressing the torque ripple for several open-phase faults. The current algorithms for different open-phase faults are demonstrated; torque ripple, especially, is analyzed with third harmonic magnetomotive force (MMF). The unified current control law is expressed with two adjustable coefficients, which are regulated for torque ripple compensation. As the current control equation remains unchanged, the fault-tolerant can smoothly switch from normal to fault condition, only with different coefficients. The proposed method with torque compensation (TC) can realize effective suppression of torque ripple. The decoupling relationship between open-phase control laws and fault-tolerant current is verified by simulation. The torque ripple of fault-tolerant and effect of torque compensation (TC) under all fault-tolerant conditions are simulated by finite element simulation. The stability of switching and correctness of torque compensation are verified by experiments.
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Yanghong, Tan, Zhang Haixia, and Zhou Ye. "A Simple-to-Implement Fault Diagnosis Method for Open Switch Fault in Wind System PMSG Drives without Threshold Setting." Energies 11, no. 10 (September 26, 2018): 2571. http://dx.doi.org/10.3390/en11102571.
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The conversion system is a major contributor to failure rates. These faults lead to time and cost consuming. Fault diagnosis capabilities pay as a solver to achieve a steady system. This paper presents a full analysis of permanent magnet synchronous generator wind system (PMSGWS) and proposes a special RMS voltage-based fault diagnosis method. The full analysis presents a comprehensive knowledge of faulty behaviors especially under arm current flowing or cutting off. Due to enough knowledge of faulty behaviors, the implementation of the detection method without threshold setting is contributed by the special RMS voltage. Its sample period is set longer than the time of the maximum pulse width ratio (MPR) and shorter than the fault show time of lower tube voltage. Due to this, the detection speed and robustness are achieved. By these simple settings for the fault diagnosis method, the faulty switch is detected in less than 1/4 of the period. Simulation and experimental results confirm the validity and feasibility of the new proposed fault detection method.
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Liu, Lei, and Xiu Qiang Li. "Study on Fault Diagnosis of Ship Power System Based on Multi-Source Information Fusion Technology." Applied Mechanics and Materials 644-650 (September 2014): 3726–29. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.3726.
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This paper firstly establishes a mathematical model of ship power system, and then analyzes the characteristics and common faults of ship power system. D-S evidence theory method is used on research of common faults of the ship power system, to enhance the pertinence of fault diagnosis. By using multi-source information fusion diagnosis, the need for quantities of electrical data is reduced, and, it can effectively reduce the impact of protection or switch malfunction on the fault diagnosis of ship power system and thus improve the accuracy of diagnosis.
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Kumar, Dhananjay, Rajesh Kumar Nema, Sushma Gupta, and Niraj Kumar Dewangan. "Development of Open Switch Fault-Tolerant Capability in CCS-MLI Topology." ECTI Transactions on Electrical Engineering, Electronics, and Communications 20, no. 2 (June 21, 2022): 197–205. http://dx.doi.org/10.37936/ecti-eec.2022202.246903.
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Multilevel inverters (MLIs) are very popular in renewable energy applications and other DC to AC conversion systems due to their reliability, reduced voltage stress, low total harmonic distortion (THD), reduced filter size, low electromagnetic interference, etc. Consequently, the photovoltaic (PV) generation systems, mainly installed in remote areas, require highly reliable systems. The high failure rate of sources and power semiconductor devices results in very low reliability for inverters used in PV generation systems. The aim of this study is to develop a five-level MLI topology with fault-tolerant (FT) characteristics. Therefore, a highly resilient fault-tolerance topology, based on a cross-connected source-based MLIs (CCS-MLI) structure, is proposed in this paper. The developed CCS-MLI topology can tolerate open switch faults in any single switch failure. The proposed system and results developed in a MATLAB/Simulink environment are discussed under normal and faulty states. The simulation results are validated experimentally. Finally, the quantitative and qualitative superiority of the proposed CCS-MLI is demonstrated through the comparative analysis of other recent topologies.
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Ma, Hong Wei, Wang Xing, Qing Hua Mao, and Yu Liu. "The Protection System Design of Leakage, Undervoltage and Overvoltage for Electromagnetic Starter in Coal Mine." Advanced Materials Research 1049-1050 (October 2014): 720–25. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.720.
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For the problem of leakage, undervoltage and overvoltage fault protection of electromagnetic starter with supply voltage of 660 V and rated current of 200A, a leakage, undervoltage and overvoltage protective system based on PLC LM3108K was designed. This system uses voltage transformer to detect three-phase AC voltage. It protects undervoltage and overvoltage fault by judging effective value of three-phase voltage, protects leakage fault of main switch for electromagnetic starter by additional DC power and protects leakage fault of branch switch by using zero-sequence power direction. This system has good protection functions for leakage, overvoltage and undervoltage faults of electromagnetic starter in coal mine.
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Tang, Xiao-Bin, and Masayoshi Tachibana. "A BIST Scheme for Bootstrapped Switches." Electronics 10, no. 14 (July 12, 2021): 1661. http://dx.doi.org/10.3390/electronics10141661.
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This paper proposes a built-in self-test (BIST) scheme for detecting catastrophic faults in bootstrapped switches. The clock signal and the gate voltage of the sampling MOS transistor are taken as the observation signals in the proposed BIST scheme. Usually, the gate voltage of the sampling MOS transistor is greater than or equal to the supply voltage when the switch is turn on, and such a voltage is not suitable for observation. To solve this problem, a low power supply voltage is provided for the bootstrapped switch to obtain a suitable observation voltage. The proposed BIST scheme and the circuit under test (CUT) are realized with transistor level. The proposed BIST scheme was simulated by HSPICE. The simulated fault coverage is approximately 87.9% with 66 test circuits.
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Lian, Zhao Min. "Common Electrical Faults Diagnosis and Elimination of Loom." Advanced Materials Research 912-914 (April 2014): 956–59. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.956.
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This paper discusses the faults of master clutch,broken weft parking,broken weft or warp no-parking,miss operation,inadequate parking and thick-film circuit,and corresponding solutions are put forward:Check clutch and replace the bearings timely when clutch has abnormal sound;Check the brake angle frequently;Pay special attention to the quality of the beam and the original yarn;Enforce vigorously the quality of the main parts; The adjustment of the sensor angle is very important;The most intuitive feel of broken weft or warp no-parking is the faults of sensor;Miss operation of loom dues to the circuit board fault or other faults,regulating improper self-locking,the peripheral circuit,starting circuit fault is in unable to conduction state,or stop circuit fault is in the power state;Inadequate parking shall check the setting position of micro switch.
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Habban, M. F., M. Manap, A. R. Abdullah, M. H. Jopri, and T. Sutikno. "An Evaluation of Linear Time Frequency Distribution Analysis for VSI Switch Faults Identification." International Journal of Power Electronics and Drive Systems (IJPEDS) 8, no. 1 (March 1, 2017): 1. http://dx.doi.org/10.11591/ijpeds.v8.i1.pp1-9.
Full textAbstract:
This paper present an evaluation of linear time frequency distribution analysis for voltage source inverter system (VSI). Power electronic now are highly demand in industrial such as manufacturing, industrial process and semiconductor because of the reliability and sustainability. However, the phenomenon that happened in switch fault has become a critical issue in the development of advanced. This causes problems that occur study on fault switch at voltage source inverter (VSI) must be identified more closely so that problems like this can be prevented. The TFD which is STFT and S-transform method are analyzed the switch fault of VSI. To identify the VSI switches fault, the parameter of fault signal such as instantaneous of average current, RMS current, RMS fundamental current, total waveform distortion, total harmonic distortion and total non-harmonic distortion can be estimated from TFD. The analysis information are useful especially for industrial application in the process for identify the switch fault detection. Then the accuracy of both method, which mean STFT and S-transform are identified by the lowest value of mean absolute percentage error (MAPE). In addition, the S-transform gives a better accuracy compare with STFT and it can be implement for fault detection system.