Готові списки джерел за темами / Open-Circuit Fault (OCF)

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Добірка наукової літератури з теми "Open-Circuit Fault (OCF)"

Автор: Grafiati
Опубліковано: 8 березня 2025

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Статті в журналах з теми "Open-Circuit Fault (OCF)"

1

Mehta, Pavan, Subhanarayan Sahoo, and Harsh Dhiman. "Open Circuit Fault Diagnosis in Five-Level Cascaded H-Bridge Inverter." International Transactions on Electrical Energy Systems 2022 (April 20, 2022): 1–13. http://dx.doi.org/10.1155/2022/8588215.

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Анотація:
The development of power electronic converter, especially multilevel converter, is remarkable for several decades. The complex switching and increased power of semiconductor devices are prime reasons for faults in multilevel inverters and have raised question about reliability. To improve the reliability, a cost-effective solution in terms of fault diagnosis is essential. In this context, this study proposed an open circuit fault (OCF) diagnosis technique for a switching device in a five-level cascaded H-bridge multilevel inverter using fuzzy logic control. The OCF features like output voltage total harmonic distortion (THD) and normalized average output voltage are fuzzed as input variables of the fuzzy logic controller. These input variables are divided into various triangular antecedent membership function (MF). The output produced by the fuzzy controller as consequent MFs is divided into different levels to identify the faulty switch. In order to make a complete fault-tolerant structure, a reduced modulation index-based postfault control is suggested to get a balanced output voltage. The MATLAB/Simulink results and prototype results are the evidence to support the proposed fault diagnosis technique.
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2

Ghanayem, Haneen, Mohammad Alathamneh, and R. M. Nelms. "Decoupled Speed and Flux Control of a Three-Phase Permanent Magnet Synchronous Motor under an Open-Circuit Fault Using a PR Current Controller." Energies 16, no. 14 (July 12, 2023): 5325. http://dx.doi.org/10.3390/en16145325.

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Анотація:
Presented in this article is a method for decoupling the speed and flux control of a three-phase permanent magnet synchronous motor (PMSM) during an open-circuit fault (OCF) using a current controller based on proportional resonant (PR) control techniques. The suggested control approach is relatively simple to implement and maintains good motor operation during the open circuit. PMSM performance under pre-fault, OCF, and post-fault conditions were investigated using Matlab/Simulink and an experimental setup based on a dSPACE DS1104. The conducted investigations provide strong evidence supporting the efficacy and resilience of the suggested control approach during OCF conditions.
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3

Singh, Vikram, Anamika Yadav, and Shubhrata Gupta. "Open circuit fault diagnosis and fault classification in multi-level inverter using fuzzy inference system." Serbian Journal of Electrical Engineering 20, no. 2 (2023): 163–89. http://dx.doi.org/10.2298/sjee2302163s.

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Анотація:
Multi-level inverters (MLIs) have been successfully used to integrated the renewable energy sources (RES) into microgrids. However, the operation of MLI is affected when an open circuit fault (OCF) or a short circuit fault occurs. Among these kinds of faults, there is a high prevalence of open circuit faults in MLI. Any fault in MLI must be identified and classified as soon as possible to maintain the reliability of the power supply. This work is focused on developing a Fuzzy Inference System (FIS) for detecting and classifying the open circuit faults in Cascaded H-Bridge Multi-Level Inverter (CHMLI), thereby improving the fault diagnosis accuracy and efficiency. In CHMLI, the gate pulse is generated by pulse width modulation (PWM) technique. The Mamdani Fuzzy Logic Controller (FLC) identifies and categorizes the different OCFs. Fuzzy logic rules are designed for detecting and classifying open circuit faults simultaneously using the fundamental Discrete Fourier components of voltage and current. Several combinations of open circuit faults have been studied in different switches of the MLI, along with the effect of fault inception angle. Furthermore, the test results support the feasibility of the proposed fuzzy-based fault diagnosis and classification scheme in a practical context. A real-time simulation obtained with the help of FPGA-based OPAL-RT 4510 demonstrates the robustness and effectiveness of the designed topology. All types and fault locations are considered in multiple cases of switch failure.
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4

M. Toche Tchio, Guy, Joseph Kenfack, Joseph Voufo, and Sanoussi S. Ouro-Djobo. "Modeling and simulation of a photovoltaic generator for analyzing the impact of faults on the I-V curve." Edelweiss Applied Science and Technology 8, no. 4 (September 12, 2024): 1687–98. http://dx.doi.org/10.55214/25768484.v8i4.1545.

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Анотація:
The rapid expansion of the solar industry has underscored the importance of photovoltaic installations in the ongoing transition to sustainable energy. With this growth comes the crucial task of effectively monitoring and controlling the power generated. Photovoltaic systems are particularly vulnerable to defects due to their exposure to challenging environmental conditions, which can lead to reduced power output and an increased risk of fire. Therefore, a thorough analysis of any faults is essential in order to mitigate potential damage to the system. The present study proposes a comprehensive analysis of the behavior of a photovoltaic generator comprising four modules. MATLAB/Simulink software is used to model the generator in healthy operation. Subsequently, a simulation of the generator in faulty conditions is conducted, considering four fault cases: partial shading (PS), open circuit fault (OCF), bypass diode disconnected (PSBD), and twinned fault bypass diode disconnected plus open circuit (PSBDOC). A detailed examination of the simulation results for the faults above reveals that the twinned fault results in a substantial reduction in the output current, as well as an elimination of the open circuit voltage of the photovoltaic generator. This contrasts the behavior observed in a system comprising two modules, wherein the open circuit voltage remains unaltered. This particular fault offers a compelling rationale for the monitoring of photovoltaic installations, to enhance overall productivity while avoiding any potential damage to the system.
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5

Abouobaida, Hassan, and Younes Abouelmahjoub. "New Diagnosis and Fault-Tolerant Control Strategy for Photovoltaic System." International Journal of Photoenergy 2021 (July 21, 2021): 1–15. http://dx.doi.org/10.1155/2021/8075165.

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Анотація:
This paper discusses open-circuit fault (OCF) diagnosis and fault-tolerant control strategy (FTCS) of a nonisolated DC-DC converter. The photovoltaic power conversion structure (PPCS) consists of a photovoltaic generator and an interleaved Boost converter (IBC). The maximum power point tracking (MPPT) control of the IBC ensures operation at maximum power. The design of the nonlinear Backstepping control is detailed based on the equivalent average model of IBC, and the stability is studied using Lyapunov’s theorem. The proposed OCF fault detection is based on sampling the voltage across the inductor at a much higher frequency than the switching frequency. In an OCF situation occurrence and a high control signal state, the detection of three negative samples is a condition for signaling the presence of an OCF fault; the photovoltaic system continues its normal operation. The simulation results show the validity of the proposed FTCS. The proposed diagnosis and control strategy improves the performance of the IBC in terms of cost, reliability, and service continuity.
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6

Zeghlache, Ayyoub, Hemza Mekki, Mohamed Fouad Benkhoris, Ali Djerioui, Djamel Ziane, and Samir Zeghlache. "Robust Fault-Tolerant Control of a Five-Phase Permanent Magnet Synchronous Motor under an Open-Circuit Fault." Applied Sciences 14, no. 12 (June 14, 2024): 5190. http://dx.doi.org/10.3390/app14125190.

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Анотація:
This paper introduces a robust fault-tolerant control (FTC) for a five-phase permanent magnet synchronous motor (FPPMSM) affected by the third harmonic under an open-circuit fault (OCF). Using field-oriented control, the proposed method demonstrates how to achieve optimal current references for torque decoupling under healthy and faulty conditions. The proposed speed and current loop controllers are based on sliding mode control (SMC), with a nonlinear extended state observer (NESO) that utilizes a hyperbolic tangent function (HTF) to provide feed-forward compensation to the controllers. The results analysis confirmed that the proposed control could enhance the tracking accuracy and robustness to disturbances under various conditions, substantially reducing torque ripples and speed fluctuations under a fault.
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7

Toche Tchio, Guy M., Joseph Kenfack, Joseph Voufo, Yves Abessolo Mindzie, Blaise Fouedjou Njoya, and Sanoussi S. Ouro-Djobo. "Diagnosing faults in a photovoltaic system using the Extra Trees ensemble algorithm." AIMS Energy 12, no. 4 (2024): 727–50. http://dx.doi.org/10.3934/energy.2024034.

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Анотація:
The application of machine learning techniques for monitoring and diagnosing faults in photovoltaic (PV) systems has been shown to enhance the reliability of PV power generation. This research introduced a novel machine learning classifier for fault diagnosis in PV systems, utilizing an ensemble algorithm known as extra trees (ETC). The study initially proposed a system with two PV modules and developed a low-cost Arduino-based data logger to gather data from the PV system in free-fault and faulty conditions. Subsequently, the study evaluated six other advanced classifiers for fault diagnosis in PV systems, namely logistic regression (LR), k-nearest neighbor (kNN), support vector machine (SVM), decision tree (DT), AdaBoost, and random forest (RF) models using the collected data from the proposed PV system. The assessment of the various models' performance indicated that the extra trees model exhibits superior classification capabilities for partial shading (PS), open circuit (OCF), partial shading with bypass diode disconnected (PSBD), and combined partial shading with bypass diode disconnected plus open circuit (PSBDOC) faults. The results demonstrated that the new ETC classifier achieves an accuracy of 92%, surpassing the 91%, 87%, 7%, and 59% accuracy of the RF, DT, kNN, and LR classifiers, respectively. This highlights the effectiveness of the extra trees model in enhancing fault detection and classification by distinguishing between open circuits and twin faults. Consequently, these results can be utilized to develop advanced diagnostic tools for photovoltaic systems, thereby improving the reliability of solar technology and accelerating the rate of installation.
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8

Ghanayem, Haneen, Mohammad Alathamneh, and R. M. Nelms. "PMSM Field-Oriented Control with Independent Speed and Flux Controllers for Continuous Operation under Open-Circuit Fault at Light Load Conditions." Energies 17, no. 3 (January 26, 2024): 593. http://dx.doi.org/10.3390/en17030593.

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Анотація:
Presented in this article is a permanent magnet synchronous motor (PMSM) control under open-circuit fault (OCF) operation using field-oriented control (FOC) with independent speed and flux controllers. The independent control allows the motor to operate efficiently under varying conditions. A simplified control approach is employed to control the PMSM under the OCF situation; the actual flux and torque of the PMSM are directly measured by the stator currents, eliminating the need for estimators or phase-locked-loop (PLL) systems. Matlab/Simulink is employed for the simulation, while hardware experiments are conducted using a dSPACE DS1104. The simulation and the hardware results demonstrate the control method’s effectiveness in maintaining continuous motor operation during OCF, its robustness against OCF conditions, and its ability to adapt under varying conditions, including speed, flux, and load torque change.
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9

Mahdavi, Mohammad Saeed, Mohammad Saleh Karimzadeh, Tohid Rahimi, and Gevork Babamalek Gharehpetian. "A Fault-Tolerant Bidirectional Converter for Battery Energy Storage Systems in DC Microgrids." Electronics 12, no. 3 (January 29, 2023): 679. http://dx.doi.org/10.3390/electronics12030679.

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Анотація:
Battery energy storage systems (BESSs) can control the power balance in DC microgrids through power injection or absorption. A BESS uses a bidirectional DC–DC converter to control the power flow to/from the grid. On the other hand, any fault occurrence in the power switches of the bidirectional converter may disturb the power balance and stability of the DC microgrid and, thus, the safe operation of the battery bank. This paper presents a fault-tolerant topology along with a fault diagnosis algorithm for a bidirectional DC–DC converter in a BESS. The proposed scheme can detect open circuit faults (OCFs) and reconfigure the topology to guarantee the safe and continuous operation of the system while it is connected to the DC microgrid. The proposed method can be extended to multi-phase structures of interleaved bidirectional DC–DC converters using only two power switches and n TRIACs to support the OCF occurrence on 2 × n switches of n legs. The proposed fault diagnosis algorithm detects OCFs only by observing the current of the inductors and does not require any sensor. Hence, the cost, weight, volume and complexity of the system is considerably reduced. Experimental results show that the reconfiguration of the converter, along with its fast fault detection, leads to fewer switches overloading and less DC voltage deviation.
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10

Li, Po, Xiang Li, and Tao Zeng. "A Fast and Simple Fault Diagnosis Method for Interleaved DC-DC Converters Based on Output Voltage Analysis." Electronics 10, no. 12 (June 17, 2021): 1451. http://dx.doi.org/10.3390/electronics10121451.

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Анотація:
Interleaved DC-DC converters have been widely used in power conversion due to their high efficiency and reliability. In the application of new energy, this plays an increasingly important role in the grid-connected power generation of wind, solar, and tidal energy. Therefore, it is crucial to ensure the reliability and proper operation of interleaved DC-DC converters. We studied an open circuit fault (OCF) diagnosis method for a three-phase interleaved buck converter. We propose a non-invasive diagnosis method based on the output voltage using the harmonic amplitude and phase at the switching frequency as the diagnostic criteria. Evaluation was carried out on a hardware-in-the-loop (HIL) test platform to prove the validity of the proposed method. The results show that the presented method had high accuracy and robustness against OCFs, which could otherwise damage the system.
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Дисертації з теми "Open-Circuit Fault (OCF)"

1

Benzine, Meryem. "Contrôle tolérant aux défauts de circuit-ouvert et de court-circuit pour un hacheur élévateur à phases parallèles et à inductances couplées." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCA021.

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Анотація:
Les hacheurs élévateurs à quatre phases parallèles et à commandes entrelacées (4IBC) sont largement utilisés dans les véhicules électriques à hydrogène (FCEVs) afin d’adapter la tension de la pile à combustible (PAC) au bus DC, assurer la tolérance aux défauts et réduire les ondulations de courant de la PAC. Etant donné que le poids et le volume constituent de réelles contraintes dans ces applications, la topologie du hacheur élévateur à quatre phases parallèles couplées inversement en cascade cyclique (4IBC-IC) a été adoptée. L’objectif de cette thèse consiste à améliorer la disponibilité des convertisseurs DC/DC, qui constitue une préoccupation majeure dans l’électronique de puissance. Dans ce contexte, un contrôle tolérant aux défauts de type court-circuit (SCF) et de type circuit ouvert (OCF), a été développé. La méthode de diagnostic proposée se base sur la mesure de la valeur moyenne des courants des inductances pour pouvoir identifier la phase en défaut, l’isoler et reconfigurer les signaux de commandes des phases saines. La régulation de la tension de sortie et des courants de phases est assurée par des correcteurs PI. Cette approche a été validée par simulation sur Matlab/Simulink et en simulation virtuelle en temps réel (VHIL) sur le logiciel Typhoon. Ces principaux résultats démontrent l'efficacité et la robustesse de cette approche à maintenir un fonctionnement optimal en mode sain et défaillant, sans générer de fausses détections.En raison des difficultés rencontrées pour obtenir des inductances couplées, la validation expérimentale de l’approche proposée a été validée sur un convertisseur 4IBC classique. Le contrôle tolérant aux défauts (FTC) a été exécuté et intégré sur La MicroLabBox DS1202 en utilisant une implémentation mixte entre son processeur et sa carte FPGA. Les résultats expérimentaux valident l’efficacité des résultats de simulation. Cette approche ne nécessite pas de capteurs supplémentaires, ni de temps d'échantillonnage élevé et elle est facile à mettre en œuvre. Elle peut facilement être intégrée aux contrôles existants et peut même être étendue à d'autres topologies de convertisseurs multi-phases.Afin de remédier aux limitations du correcteur PI, une amélioration des boucles de régulations a été proposée en utilisant des contrôleurs non-linéaires, qui sont robustes aux perturbations et aux variations et permettent d'améliorer la dynamique du convertisseur. Cette approche repose sur le contrôle par platitude de la tension de sortie et le contrôle par mode glissant pour la régulation des courants de phases. La particularité de cette amélioration est l'utilisation d'un observateur pour estimer la tension d'entrée et le courant de charge, afin d'optimiser judicieusement le nombre de capteurs sans utiliser de capteurs supplémentaires. L'approche de diagnostic proposée est également intégrée et communique les informations de présence de défauts avec les boucles de régulation et avec l'observateur afin d'optimiser le fonctionnement du convertisseur en mode défaillant. Les résultats de simulation montrent la robustesse de cette approche face aux variations et aux perturbations. Ces contributions améliorent la disponibilité et la robustesse des convertisseurs DC/DC et renforcent la position des FCEVs en tant qu'option viable et prometteuse pour le transport durable
Fuel cell electric vehicles (FCEVs) are seen as potential solutions and represent one of the most recent advances in the field of transport to reduce CO2 emissions. As the fuel cell is the main power source, a boost converter is required to increase its low voltage and adapt it to the DC bus voltage. The four-phase interleaved DC/DC boost converter with inverse cyclic cascade coupled inductors (4IBC-IC) has been confirmed as the most suitable architecture for fuel cell electric vehicles. Not only does it improve efficiency and reduce the converter’s size, but it also helps to extend the fuel cell's lifespan by reducing input current ripple. Since semiconductors are very fragile components, they can fail and degrade fuel cell system performance. Even if the converter architecture is fault-tolerant, it requires a fault-tolerant controller to ensure optimal operation in the event of disturbances or faults. In this context, a signal-based fault-tolerant control is proposed in this thesis to diagnose both short-circuit fault (SCF) and open-circuit-fault (OCF). Once the fault is detected, it is isolated by the control unit and the converter architecture is then reconfigured according to the fault location to ensure optimal operation. PI correctors are implemented to ensure the regulation of the output voltage and phase currents. Due to the unavailability of coupled inductors, this approach has been validated experimentally on a classical four-phase interleaved boost converter (4IBC) test bench using the MicroLabBox DS1202 with its processor and internal FPGA board to implement the fault-tolerant control.Simulation, on Matlab/Simulink and virtual hardware simulation (VHIL), and experimental results validate the robustness of the proposed fault-tolerant control. It is easy to implement and can quickly identify faults without the need for additional sensors. It operates efficiently without requiring high sampling rates, addressing one of the key limitations of signal-based methods. Given its simplicity of implementation, the proposed method can be easily integrated into existing controls and can even be extended to other multilevel converter topologies.To improve the robustness of the control unit, a novel fault-tolerant robust control approach has been proposed by replacing the traditional PI controllers with flatness-based and sliding mode controllers while incorporating an observer. The observer plays a key role in accurately estimating the input voltage and load current, ultimately ensuring high robustness against disturbances. A judicious optimization of the number of sensors is thus achieved, minimizing the cost and the probability of measurement errors. Simulation results in the Matlab/Simulink environment confirm the effectiveness of this approach. This significant contribution strengthens the reliability and robustness of DC/DC converters with coupled inductors and consolidates the position of the FCEVs as a promising sustainable mobility solution
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2

Jayaraman, Vivek Adithya. "Protection of Falling Conductors into Flammable Vegetation Faults." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/101901.

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Анотація:
Increasing modernization of the world has brought about a human component to natural disasters, which are exacerbated by the growing threat of climate change. The Western United States and Australia have witnessed some of the deadliest, costliest, and destructive wildfires in the recent past with downed electric power lines being a significant factor amongst the causes. The relationship between wildfires and powerlines is not a newly discovered phenomenon, however, utilities across the globe are struggling to find an optimal solution to this problem. While existing regulations allow utilities to schedule power shutdowns, they are often accompanied by massive financial losses and discomfort to consumers. Utilities also need to factor in the climatic conditions in the region of their service and the flammability of the vegetation surrounding their lines while making decisions pertaining to system planning, load shedding, and protection. This multi-faceted problem can be dealt with in multiple ways – one such technique involves detection of a falling line into sensitive vegetation before it encounters the earth. This approach essentially boils down the problem into detecting a single line open circuit fault. The open circuit is momentary and hence, speed is of the essence in such a protection scheme. In this thesis, detection of an open circuit is carried out in two different ways, viz., with and without communication support between the various elements of the system, with the latter technique being a novel proposal with the aim of achieving a secure protection scheme with minimal additional infrastructural requirements.
Master of Science
The contact of a live wire with the earth is a fault. While most faults can be cleared using traditional protection techniques, there is a higher risk associated with power lines that come in contact with dry surfaces, flammable plants, and bushes, which cannot be detected that easily. These surfaces offer very high resistance to the flow of current and are hence termed high impedance faults. These high impedance faults have the potential to spark and cause a fire, which can snowball into a wildfire depending on the geography and climatic conditions of the area. For years, this has been a major problem in places like Australia and California leading to loss of lives, power, and money, but the optimal solution is evasive. While several techniques to combat this problem exist, the focus of this thesis is essentially what is known as the Open Circuit Fault. The technique revolves around the detection of the fault while the falling conductor is midair. Given the short time frame, high-speed detection is of the essence. This thesis will focus on achieving open circuit detection without the need for any communication support and is a novel contribution to this field.
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3

LIN, JHONG-CYUAN, and 林中全. "Analysis of Open-Circuit Switch Faults and Fault Diagnosis for Active Neutral-Point-Clamped Inverters." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/k794fx.

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Анотація:
碩士
國立高雄應用科技大學
電機工程系博碩士班
106
This thesis investigates the fault behavior and analysis for open-switch damages in active neutral point clamped inverters.This thesis analyzes the influence of the terminal voltage on the four working areas of the inverter operation first, and summarizes the fault analysis results.Then the Active neutral point clamped inverter is modeled in MATLAB/Simulink to analyze the performance of this inverter.This thesis analyses the working situation of the switching devices under the open-circuit fault, studies the specific fault characteristics and typical waveforms in detail.Finally, the simulation results illustrate that open switch faults diagnosis system can get correct and fast effect for identification.
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4

Li, Bing-Feng, and 李柄鋒. "Tolerant Control of Open-Circuit Fault for Three-Level T-type Inverter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/09610942677366275414.

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Анотація:
碩士
國立中山大學
電機工程學系研究所
104
As there are more applications of T-type inverter, the concern of the inverter reliability has been increasing. This thesis investigates the operation modes of three-level T-type inverter circuit, proposed a new method to detect fault phase .The proposed method can locate fault switch by detecting the average value of phase current and the situation of unbalance voltage of capacitors. Carrier-based pulse width modulation is applying to achieve the tolerance control, and making the modulation scheme more easier to implement. A neutral-point voltage balance control for three-level T-type inverter is also applied. Finally, the availability and performance of the proposed of open-circuit fault tolerant control are verified with the laboratory prototype.
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5

Biswas, Bidhan. "Short Circuit and Open Circuit Natural Frequencies of 3-Φ Transformers: Derived Analytical Expressions and its Applications". Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6021.

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Анотація:
Frequency Response Analysis (FRA) method is perhaps the most sensitive tool that can detect even the slightest of winding/core movements. High sensitivity, non-invasiveness, non-destructiveness, and on-site capability are some salient features − making it an ideal monitoring and detection tool. The existence of Standards (IEEE, IEC, and CIGRE) is ample testimony of its global acceptance and superior detection capabilities. The detection principle is based on observing a deviation between two measured FRAs which implies a possible fault. Naturally, the next logical step is to analyze these deviations to determine the type of fault, estimate the extent of damage and its severity, and as a bonus, predict its location, if possible. However, even after three decades, arriving at these inferences is still at the research level. Even though there is a consensus among all the standards on FRA test/measurement procedures, best-suited terminal connections, cable layout, grounding practices, etc., they remain largely silent regarding interpretation and diagnostics. A detailed analysis of literature compiled in Chapter 1 reveals that lack of a mathematical foundation might be one reason for the present plight of FRA. So, developing a generic mathematical-based approach for interpretation and location of incipient mechanical winding damages in actual 3-Φ transformer windings using measured FRA, is imperative. Development of such a generic method necessitates derivation of closedform expressions, which can directly link measured FRA quantities to the electrical parameters of the winding. For assessing damage severity, the challenge is to identify a quantity which is not only extractable from measured FRA, but also be sensitive, monotonic, and traceable to the fault. Driven by this philosophy, this thesis aims to address the following - 1. Propose a unified and general approach to derive closed-form analytical expressions (for each multiphase winding) to link the measured open and short circuit natural frequencies to electrical parameters of the winding and valid for any condition of the neutral 2. Define a quantity calculable from the measured FRA’s peak/trough frequencies which is physically related to mechanical damage in the winding and capable of yielding some physical insight about damage 3. Develop novel methods using the derived analytical expressions to identify an incipient, discrete and localized axial and/or radial displacement in any multiphase winding and applicable for any condition of the neutral In the second chapter, a generic and unified analytical method is developed (applicable to any 1-Φ or 3-Φ winding) starting from the basic mutually coupled lossless ladder network model to derive equations which relate the harmonic sum of squares of short circuit natural frequencies (SCNF) and open circuit natural frequencies (OCNF) to the elemental winding inductances and capacitances. Complete derivation details are discussed, and all the derived formulae were cross-verified by extensive numerical circuit simulations. Each of these derived expressions has a strikingly similar structure and possesses a unique property, viz., the contribution of series capacitances and ground capacitances are decoupled. This important property paves the way for estimating a physical quantity directly responsible for the winding resonances, viz., the effective air-core inductance (Leff). This estimation requires multiple FRA measurements. Chapter 3 presents complete details of the concept, its derivation, measurements, and experimental results for all 1-Φ and 3-Φ windings. Loss of clamping pressure in a winding is not directly identifiable by any means other than an FRA measurement. But, this damage cannot be judged by merely comparing two FRAs. So, a clamping pressure measurement experiment was carried out on a single isolated winding to ascertain the sensitivity and monotonicity afforded by the quantity, Leff, to a change in clamping pressure. Driven by the promising results, author proceeds to build a method based on Leff to find the location of a discrete and localized axial displacement (AD) in any 3-Φ winding configuration. Details of this method, experimental results, and measurement steps are presented in Chapter 4. Proceeding further, Chapter 5 discusses concept of a new method, measurement steps and experimental results to identify presence of a Radial Displacement (RD) in a 3-Φ star winding with neutral-open, as well as, in a delta connected winding. Driven by success, the concept was extended to identify the simultaneous occurrence of a discrete and localized AD and RD in one phase of a 3-Φ star winding, with neutral-open. Preliminary experimental results proved the method could successfully identify faulted phases that contained AD and RD. All experiments reported in the thesis were carried out on transformer windings rated at 33 kV, 3.5 MVA. The results are encouraging, and the author believes that true potential of the proposed methods can be judged when implemented on actual transformers. In summary, this thesis presents, perhaps for the first time, a mathematical basis for identifying and diagnosing axial and radial displacements in 1-Φ and 3-Φ windings using the peak/trough frequency data from the measured FRA. The author believes this is a small step forward in advancing FRA as a diagnostic tool.
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Частини книг з теми "Open-Circuit Fault (OCF)"

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Tan, Huiyu, Xi Yang, Fu Song, Taolue Chen, and Zhilin Wu. "Compositional Verification of Cryptographic Circuits Against Fault Injection Attacks." In Lecture Notes in Computer Science, 189–207. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-71177-0_13.

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AbstractFault injection attack is a class of active, physical attacks against cryptographic circuits. The design and implementation of countermeasures against such attacks are intricate, error-prone and laborious, necessitating formal verification to guarantee their correctness. In this paper, we propose the first compositional verification approach for round-based hardware implementations of cryptographic algorithms. Our approach decomposes a circuit into a set of single-round sub-circuits which are verified individually by either SAT/SMT- or BDD-based tools. Our approach is implemented as an open-source tool , which is evaluated extensively on realistic cryptographic circuit benchmarks. The experimental results show that our approach is significantly more effective and efficient than the state-of-the-art.
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Zhu, Qinyue, Yichen Yu, Yanwen Zhan, Jie Li, and Yanbiao Yang. "IGBT Open-Circuit Fault Diagnosis for MMC Based on OCDWPT." In Proceedings of the 6th International Conference on Electrical Engineering and Information Technologies for Rail Transportation (EITRT) 2023, 489–97. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-9307-9_54.

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Qi, Peiwen, Wendi Zheng, Xinchong Wu, and Xiangyong Zeng. "IGBT Open-Circuit Fault Diagnosis and Location of MMC Sub-module." In Proceedings of PURPLE MOUNTAIN FORUM 2019-International Forum on Smart Grid Protection and Control, 537–47. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9779-0_44.

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Zhu, Qinyue, Daquan Li, Xitang Tan, Xiuhan Huang, and Jingran Xu. "IGBT Open-Circuit Fault Diagnosis for MMC Based on Model Prediction." In Proceedings of the 5th International Conference on Electrical Engineering and Information Technologies for Rail Transportation (EITRT) 2021, 564–74. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9913-9_63.

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Zhang, Xinqing, Zhen Li, Zhenbin Zhang, Rong Ye, and Zhi Li. "Open-Circuit Fault Diagnosis for Wave Energy Converters with Support Vector Machine." In Conference Proceedings of 2022 2nd International Joint Conference on Energy, Electrical and Power Engineering, 1052–58. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-4334-0_125.

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Yu, Zhiwu, Weiye Yang, Pinjia Zhang, Wenjie Zhu, Bi Liu, Cungang Hu, and Wenping Cao. "Open-Circuit Fault Detection Method for Full-Bridge Modular Multilevel Converter Sub-Modules." In Conference Proceedings of the 2023 3rd International Joint Conference on Energy, Electrical and Power Engineering, 206–14. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-3940-0_21.

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Sobański, Piotr, and Teresa Orłowska-Kowalska. "IGBT Open-Circuit Fault Diagnostic Methods for SVM-VSI Vector-Controlled Induction Motor Drives." In Advanced Control of Electrical Drives and Power Electronic Converters, 121–39. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45735-2_6.

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Zhang, Ming, Yuanbo Guo, Kai Huang, Lin Li, and Xiaohua Zhang. "IGBT Open-Circuit Fault Diagnosis for Closed-Loop System of Three-Level NPC Inverters." In Proceedings of the 2015 International Conference on Electrical and Information Technologies for Rail Transportation, 713–21. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49367-0_69.

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Xiang, Li, Li Shaojian, Wang Yu, Zhang Zijun, Luo Hui, Chu Jian, Wei Jie, and Huang Yong. "Open-Circuit Fault Diagnosis for Three-Phase Voltage Source Inverter Based on Multi-source Information Fusion." In Conference Proceedings of 2022 2nd International Joint Conference on Energy, Electrical and Power Engineering, 1232–38. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-4334-0_146.

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Javier Villalobos-Pina, Francisco, Josué A. Reyes-Malanche, Eduardo Cabal-Yepez, and Efrain Ramirez-Velasco. "Open Circuit Fault Diagnosis in Induction Motor Driver Inverter." In Induction Motors - Latest Research and Applications [Working Title]. IntechOpen, 2024. http://dx.doi.org/10.5772/intechopen.1006637.

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The induction machines are the power horses in the industry due to the practically null maintenance, this kind of machines are use in a widely group of industrial applications, and with the advance of power electronics these machines replace another kind, like direct current (dc) motors attributable to the evolution of control algorithms and the digital platforms. In this context, a methodology is proposed to detect and isolate faults, focusing on the inverter stage of Induction Machine motor drives, with a specific emphasis on Insulated Gate Bipolar Transistor (IGBT) faults, using phasor analysis and fuzzy logic. This methodology has demonstrated effective performance in detecting and isolating different types of electrical faults, such as stator inter-turn short-circuit. In this case, damaged switching IGBTs were identified using low computational resources. This research was motivated because some complex techniques like music (multiple signal classifier), dynamic observers, techniques based on mathematical models, statistics techniques, optimization techniques, AI techniques like deep learning, vector support machines, genetic algorithms, and so on, require a great quantity of data and or computer processing. Thanks to this scheme, it is possible to implement a low cost computational platform based on a TI DSP TMS320F28335 processor for a real-time fault diagnosis in Induction Machine inverter.
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Тези доповідей конференцій з теми "Open-Circuit Fault (OCF)"

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Arsalan, Ali, Behnaz Papari, S. M. Imrat Rahman, Laxman Timilsina, Ali Moghassemi, Grace Muriithi, Gokhan Ozkan, Christopher Edrington, and Elutunji Buraimoh. "Machine Learning Approach for Open Circuit Fault Detection and Localization in EV Motor Drive Systems." In WCX SAE World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2024. http://dx.doi.org/10.4271/2024-01-2790.

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<div class="section abstract"><div class="htmlview paragraph">Semiconductor devices in electric vehicle (EV) motor drive systems are considered the most fragile components with a high occurrence rate for open circuit fault (OCF). Various signal-based and model-based methods with explicit mathematical models have been previously published for OCF diagnosis. However, this proposed work presents a model-free machine learning (ML) approach for a single-switch OCF detection and localization (DaL) for a two-level, three-phase inverter. Compared to already available ML models with complex feature extraction methods in the literature, a new and simple way to extract OCF feature data with sufficient classification accuracy is proposed. In this regard, the inherent property of active thermal management (ATM) based model predictive control (MPC) to quantify the conduction losses for each semiconductor device in a power converter is integrated with an ML network. This recurrent neural network (RNN)-based ML model as a multiclass classifier localizes the faulty switch based on the dynamics associated with conduction losses as reliable and feature-rich data. The presented approach utilizes the controller data with no additional computational load to compute the feed-in data for the ML model and no extra hardware requirements. The proposed data-driven approach, with an accuracy of 99% for distinct hyperparameters and testing datasets, proves to be a promising solution for OCF DaL.</div></div>
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Muhammad, Khairul Safuan, Rahimi Baharom, Mohd Khairul Mohd Salleh, and Dylan Dah-chuan Lu. "Open-circuit fault tolerant bridgeless boost rectifier." In IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2016. http://dx.doi.org/10.1109/iecon.2016.7793045.

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Ronghua Cui, Ying Fan, Xiangyang Zhang, Weixia Zhu, and Ming Cheng. "A new fault-tolerant control strategy for switch open-circuit fault in open-winding driving system." In IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2016. http://dx.doi.org/10.1109/iecon.2016.7793131.

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YANG, Junjie, and Claude DELPHA. "Open-Circuit Fault Diagnosis for Interleaved DC-DC Converters." In IECON 2020 - 46th Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2020. http://dx.doi.org/10.1109/iecon43393.2020.9255288.

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Jin, Ming, Fujin Deng, Chengkai Liu, Qiang Yu, Jifeng Zhao, and Qingsong Wang. "Statistical Multi-Faults Localization Strategy of Switch Open-Circuit Fault for Modular Multilevel Converters Using Grubbs Criterion." In IECON 2020 - 46th Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2020. http://dx.doi.org/10.1109/iecon43393.2020.9254519.

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Jian Zhang, Zhuoran Zhang, Yin Wang, and Wenying Jiang. "Fault-tolerant control without extra hardware for doubly salient brushless DC motor drive under open-circuit faults." In IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2016. http://dx.doi.org/10.1109/iecon.2016.7793647.

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Vlaisavljević, Milica, and Mileta Žarković. "DIJAGNOSTIKA STANjA VISOKONAPONSKIH PREKIDAČA NA BAZI ON-LINE MONITORINGA." In 35. Savetovanje Srpskog nacionalnog komiteta Međunarodnog saveta za velike električne mreže. Srpski nacionalni komitet Međunarodnog saveta za velike električne mreže CIGRE Srbija, 2023. http://dx.doi.org/10.46793/cigre35.0986v.

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High voltage circuit breakers are very important switchgear in the power system. They are the only ones that can interrupt fault currents, for that reason their proper monitoring and maintenance is very important. The results of monitoring high voltage circuit breakers used in this paper are: measuring insulation resistance, checking oil dielectric strength, vacuum degree or gas density SF6, checking position of contacts in open - closed state, checking contact stroke by recording space - time diagram, measuring coil current for switching on and off, measuring the start-up time of the drive mechanism and checking the number of operations and measuring the contact resistance. This paper presents an innovative algorithm for the application of autoencoder neural networks(ANN) and an algorithm for creating a health index. The application of the presented methods enables on-line diagnostics of high voltage circuit breakers and decision- making on their further maintenance, repair or replacement in real time.
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Baoping Shi, Bo Zhou, Na Han, Xianhui Qin, Xingwei Zhou, and Jian Zhang. "Open-circuit fault diagnosis for rectifier stage in indirect matrix converter." In IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2016. http://dx.doi.org/10.1109/iecon.2016.7792968.

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Liu, Jinxin, Xiaobin Zhang, Yingnan Ren, Guozhao Liu, and Zhiyuan Guo. "Switch Open and Short Circuit Fault diagnosis and Fault Tolerant Operation for Push-Pull Converter." In IECON 2021 - 47th Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2021. http://dx.doi.org/10.1109/iecon48115.2021.9589258.

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Abuelnaga, Ahmed, and Mehdi Narimani. "Open Circuit IGBT Fault Classification using Phase Current in a CHB Converter." In IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2019. http://dx.doi.org/10.1109/iecon.2019.8927101.

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Звіти організацій з теми "Open-Circuit Fault (OCF)"

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Masrur, M. A., ZhiHang Chen, and Yi L. Murphey. Intelligent Diagnosis of Open and Short Circuit Faults in Electric Drive Inverters For Real-Time Applications. Fort Belvoir, VA: Defense Technical Information Center, March 2009. http://dx.doi.org/10.21236/ada513126.

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Yunovich. L52265 User Manual for Electrical Isolation Devices. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), August 2004. http://dx.doi.org/10.55274/r0010183.

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There is no specific guidance available on the use of electrical isolation devices and how to protect against faults. Because of this, the practice of isolation is varied, which at times may lead to a possible loss of pipeline integrity or electrical safety hazards. Electrically isolating devices are common in cathodically protected piping systems. They can be used to electrically isolate the pipeline from terminal facilities and pumping systems, to divide the pipeline into sections for individual CP, or to manage stray current interference. NACE International defines these devices as an Electrical Isolating Joint. This document addresses the conditions when the use of isolating devices is indicated and outlines the conditions when installing an isolating device may either create an adverse condition or require additional measures (such as protective devices) to ensure the proper operation. Installation of electrical isolation (EI) devices may be a requirement for cathodically protected underground pipe. The primary purpose of the isolation is to open an electrical circuit formed by the protected structure and other metallic objects such as terminal facilities, pumping and compressor stations, metering stations, river crossings, etc.
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