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Total 131 records

    A fault-tolerant strategy for three-phase dual active bridge converter

    , Article 10th International Power Electronics, Drive Systems and Technologies Conference, PEDSTC 2019, 12 February 2019 through 14 February 2019 ; 2019 , Pages 253-258 ; 9781538692547 (ISBN) Davoodi, A ; Noroozi, N ; Zolghadri, M. R ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2019
    Abstract
    Due to several advantages, three-phase Dual Active Bridge (DAB) converter is widely used in numerous applications nowadays. On the other hand, this converter is very vulnerable to Transistor Open-Circuit Fault (TOCF). Therefore, a fault-tolerant (FT) scheme has been proposed in this paper to solve the problem. First, normal and faulty conditions are investigated, and according to the results, a fault-diagnosis (FD) approach is introduced. Using the outcomes of FD unit, a new post-fault strategy is proposed for the converter. The FD method is based on the DC component of transformer phase currents, and the basis of FT technique is shedding the faulty phase. Some benefits of the proposed... 

    A unified approach to detect and distinguish hardware trojans and faults in sram-based fpgas

    , Article Journal of Electronic Testing: Theory and Applications (JETTA) ; Volume 35, Issue 2 , 2019 , Pages 201-214 ; 09238174 (ISSN) Ranjbar, O ; Bayat Sarmadi, S ; Pooyan, F ; Asadi, H ; Sharif University of Technology
    Springer New York LLC  2019
    Abstract
    In recent years, confrontation with hardware Trojans has become a major concern due to various reasons including outsourcing. Such a growing threat is more pronounced in reconfigurable devices as they are used in widespread applications due to low design cost and short time-to-market. Besides their vulnerability to hardware Trojan attacks, SRAM-based reconfigurable devices are also significantly susceptible to faults originated by particle strikes. There have been various methods to mitigate either hardware Trojan attacks or faults. To our knowledge, however, no method has been presented that can integrate detecting, distinguishing, and mitigating faults and Trojans. In this paper, we... 

    A Vacuum arc diagnosis method for the high voltage power supply of vacuum tubes

    , Article 2019 International Vacuum Electronics Conference, IVEC 2019, 28 April 2019 through 1 May 2019 ; 2019 ; 9781538675342 (ISBN) Ayoubi, R ; Rahmanian, M ; Kaboli, S ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2019
    Abstract
    Vacuum tubes are widely used for various applications. These vacuum tubes are supplied by high voltage power supplies. The amount of delivered energy from the high voltage power supply to the vacuum tube is an important issue during the vacuum arc in the tube. The protection mechanism consists of a shunt crowbar which diverts the fault current from the tube to itself as a parallel path. Detection of the vacuum arc is crucial and only one sensor is usually employed to detect the vacuum arc. This characteristic intensifies the interference susceptibility of the vacuum arc diagnosis system in a noisy environment. As a result of the noise, the arc detection system can report false alarms. False... 

    Transformer turn-to-turn fault protection based on fault-related incremental currents

    , Article IEEE Transactions on Power Delivery ; Volume 34, Issue 2 , 2019 , Pages 700-709 ; 08858977 (ISSN) Farzin, N ; Vakilian, M ; Hajipour, E ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2019
    Abstract
    Winding turn-to-turn fault (TTF) is one of the most reported reasons for transformer unplanned outage. If its occurrence is not detected at an early stage, it can develop into a costly phase-to-ground fault. In this paper, a novel algorithm based on the fault-related incremental currents is proposed to detect a low-level transformer TTF. This paper shows that the performance of the proposed method is independent of the transformer operating condition. Therefore, it is reliable even under the presence of power system transients such as the external faults. In addition, the proposed algorithm can be configured uniquely and easily. This feature prevents the algorithm from unnecessary trips.... 

    IGBT Open-circuit fault diagnosis in a quasi-z-source inverter

    , Article IEEE Transactions on Industrial Electronics ; Volume 66, Issue 4 , 2019 , Pages 2847-2856 ; 02780046 (ISSN) Yaghoubi, M ; Moghani, J. S ; Noroozi, N ; Zolghadri, M. R ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2019
    Abstract
    In this paper, a fast and practical method is proposed for open-circuit (OC) fault diagnosis (FD) in a three-phase quasi-Z-source inverter (q-ZSI). Compared with the existing fast OC FD techniques in three-phase voltage source inverters, this method is more cost-effective since no ultrafast processor or high-speed measurement is required. Additionally, the method is independent of the load condition. The proposed method is only applicable to Z-source family inverters and is based on observing the effect of shoot-through intervals on the system variables during switching periods. The proposed algorithm includes two consecutive stages: OC detection and fault location identification. When both... 

    Detecting the location of short-circuit faults in active distribution network using pmu-based state estimation

    , Article IEEE Transactions on Smart Grid ; Volume 11, Issue 2 , 2020 , Pages 1396-1406 Gholami, M ; Abbaspour, A ; Moeini Aghtaie, M ; Fotuhi Firuzabad, M ; Lehtonen, M ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2020
    Abstract
    With the rapid advancement of phasor measurement units (PMUs) technology, system operators in different level of power systems have access to new and abundant measurements. Taking into account these measurements in active distribution systems (ADNs), a new algorithm for short-circuit fault detection and identification based on state estimation (SE) is introduced in this paper. In this regard, as the first step, traditional SE process is revised to be compatible with fault conditions. Then, a fault location algorithm (FLA) based on the revised SE (RDSSE) is presented which attends to detect the location of fault after diagnosing faulted zone. For this purpose, current and voltage... 

    Efficient health monitoring of buildings using failure modes and effects analysis case study: Air handling unit system

    , Article Journal of Building Engineering ; Volume 29 , 2020 Parhizkar, T ; Aramoun, F ; Saboohi, Y ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    System health management based on condition monitoring is of great value and significance for improving system performance and reliability. As more data from condition monitoring is obtained, the efficiency of system health monitoring improves. However, increasing the amount of data by installing new sensors on system components is restricted by a variety of factors such as budget, weight and space allowance. Therefore, sensor selection in the most optimal manner in order to achieve maximum valuable information from system is an important issue. In this study, a novel concept is introduced that can be used in sensor combination optimization problems. This concept employs failure modes and... 

    An on-line BIST technique for delay fault detection in CMOS circuits

    , Article 16th Asian Test Symposium, ATS 2007, Beijing, 8 October 2007 through 11 October 2007 ; November , 2007 , Pages 73-76 ; 10817735 (ISSN); 0769528902 (ISBN); 9780769528908 (ISBN) Moghaddam, E ; Hessabi, S ; Sharif University of Technology
    2007
    Abstract
    This paper presents a simulation-based study of the delay fault testing in CMOS logic circuits. A novel built-in self-test (BIST) technique is presented for detecting delay faults in this logic family. This scheme does not need test-pattern generation, and thus can be used for robust on-line testing. Simulation results for area, delay, and power overheads are presented. © 2007 IEEE  

    Experimental evaluation of three concurrent error detection mechanisms

    , Article 2006 International Conference on Microelectronics, ICM 2006, Dhahran, 16 December 2006 through 19 December 2006 ; 2006 , Pages 67-70 ; 1424407656 (ISBN); 9781424407651 (ISBN) Vahdatpour, A ; Fazeli, M ; Miremadi, S. G ; Sharif University of Technology
    2006
    Abstract
    This paper presents an experimental evaluation of the effectiveness of three hardware-based control flow checking mechanisms, using software-implemented fault injection (SWIFI) method. The fault detection technique uses reconfigurable of the shelf FPGAs to concurrently check the execution flow of the target program. The technique assigns signatures to the target program in the compile time and verifies the signatures using a FPGA as a watchdog processor to detect possible violation caused by the transient faults. A total of 3000 faults were injected in the experimental embedded system, which is based on an 8051 microcontroller, to measure the error detection coverage. The experimental... 

    Detection of inappropriate working conditions for the timing belt in internal-combustion engines using vibration signals and data mining

    , Article Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering ; Volume 231, Issue 3 , 2017 , Pages 418-432 ; 09544070 (ISSN) Khazaee, M ; Banakar, A ; Ghobadian, B ; Agha Mirsalim, M ; Minaei, S ; Jafari, S. M ; Sharif University of Technology
    SAGE Publications Ltd  2017
    Abstract
    Abnormal operating conditions for the timing belt can lead to cracks, fatigue, sudden rupture and damage to engines. In this study, an intelligent system was developed to detect and classify high-load operating conditions and high-temperature operating conditions for timing belts. To achieve this, vibration signals in normal operating conditions, high-load operating conditions and high-temperature operating conditions were collected. Time-domain signals were transformed to the frequency domain and the time-frequency domain using the fast Fourier transform method and the wavelet transform method respectively. In the data-mining stage, 25 statistical features were extracted from different... 

    Sensor fault-tolerant scheme for IPM synchronous motor drives via nonlinear observer

    , Article AUPEC'09 - 19th Australasian Universities Power Engineering Conference: Sustainable Energy Technologies and Systems, 27 September 2009 through 30 September 2009, Adelaide ; 2009 ; 9780863967184 (ISBN) Nademi, H ; Farshidnia, A ; Keivanian, R ; Sharif University of Technology
    Abstract
    This paper describes a control scheme that allows an IPMS motor drive system to operate in the event of current and speed sensor faults. This task can be achieved by two control strategies: a nominal performance controller and a fault detection part. The nominal controller combines field oriented control and addresses fault tolerance scheme. Fault-tolerant strategy will operate in parallel with the system until a fault is detected. This approach is based on the adaptive backstepping observer. Stator resistance as possible source of system uncertainty is taken into account under different operating conditions. Sensors failure are detected and developed observer is used to estimate currents...