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2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

作者： Sharida, Ali Kamal, Naheel Bayhan, Sertac Abu-Rub, Haitham Texas A&m University Texas A&m University at Qatar Electrical and Computer Engineering College Station United States Hamad Bin Khalifa University Qatar Environment and Energy Research Institute Doha Qatar Texas A&m University at Qatar Electrical and Computer Engineering Doha Qatar

ISBN: (纸本)9798350316445

This paper proposes a novel open-switch fault detection algorithm for the T-type rectifiers based on the DC link voltage variation. The pattern of the variation of the DC link voltage is observed for each fault scenario under different power levels. The DC link voltage is continuously monitored and compared with the recognized pattern to detect and localize the open-switch fault. When a fault is detected and localized, the algorithm is proposed to change the switching function of the faulty leg. This can be done by using a classical two-level function instead of the three-level switching function. The proposed algorithm focuses on the auxiliary switches faults as they have severe effects on the response of the rectifier. The proposed methodology requires only one voltage sensors and without complex computations or estimation. The validity of the proposed method is demonstrated using hardware experiments. © 2023 IEEE.

关键词： fault tolerant control open-switch fault detection T-type rectifier

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open-switch fault detection Method of a Back-to-Back Converter Using NPC Topology for Wind Turbine Systems

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IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 2015年第1期51卷 325-335页

作者： Lee, June-Seok Lee, Kyo-Beum Blaabjerg, Frede Ajou Univ Dept Elect & Comp Engn Suwon 443749 South Korea Aalborg Univ Dept Energy Technol DK-9220 Aalborg Denmark

In wind turbine generation (WTG) systems, a back-to-back converter with a neutral-point-clamped (NPC) topology is widely used because this topology has more advantages than a conventional two-level topology, particularly when operating at high power. There are 12 switches in the NPC topology. An open-switch fault in the NPC rectifier of the back-to-back converter leads to the distortion of the input current and torque vibration in the system. Additionally, an open-switch fault in the NPC inverter of the back-to-back converter causes the distortion of the output current. Furthermore, the WTG system can break down in the worst case scenario. To improve the reliability of WTG systems, an open-switch fault detection method for back-to-back converters using the NPC topology is required. This study analyzes effects of inner and outer open-switch faults of the NPC rectifier and inverter and describes a novel open-switch fault detection method for all possible open-switch faults in the back-to-back converter.

关键词： Back-to-back converter neutral-point-clamped (NPC) topology open-switch fault open-switch fault detection

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Voltage-Sensorless open-switch fault-Tolerant Control of Three-Phase T-Type Rectifier

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IEEE TRANSACTIONS ON POWER ELECTRONICS 2023年第12期38卷 15365-15376页

作者： Sharida, Ali Bayhan, Sertac Abu-Rub, Haitham Fesli, Ugur Texas A&M Univ Syst Dept Elect & Comp Engn Doha 23874 Qatar Qatar Environm & Energy Res Inst Energy Ctr Doha 34110 Qatar Texas A&M Univ Qatar Dept Elect Engn Doha 23874 Qatar Gazi Univ TR-06560 Ankara Turkiye

This article proposes a grid voltage-sensorless open-switch fault detection and fault-tolerant control for a three-phase three-level T-type rectifier. First, the parameters of the rectifier's mathematical model are estimated online. Then, changes in the estimated parameters are observed and analyzed to detect and localize the fault based on the amount of parameters' change and which parameter is changed. When a fault is detected and localized, the fault-tolerant control switches to an alternative switching function to allow the converter to operate satisfactorily. In addition, a robust control algorithm is proposed to handle all switching functions and topological changes. Unlike cascaded controllers, the proposed controller uses a single-loop control where the current reference generation and current-tracking processes are done using a single controller. The design of such a controller depends on estimating the relationship between the dc-link voltage, grid voltages, and grid currents. Experimental investigations are conducted to validate the concept and prove its high-quality operation.

关键词： fault-tolerant control open-switch fault detection sensorless control single-loop control T-type rectifier

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Digital-Twin-Based Diagnosis and Tolerant Control of T-Type Three-Level Rectifiers

IEEE OPEN JOURNAL OF THE INDUSTRIAL ELECTRONICS SOCIETY

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IEEE open JOURNAL OF THE INDUSTRIAL ELECTRONICS SOCIETY 2023年 4卷 230-241页

作者： Sharida, Ali Kamal, Naheel Faisal Alnuweiri, Hussein Bayhan, Sertac Abu-Rub, Haitham Texas A&M Univ College Stn TX 77843 USA Texas A&M Univ Qatar Doha 23874 Qatar Hamad Bin Khalifa Univ Qatar Environm & Energy Res Inst Doha 34110 Qatar Gazi Univ TR-06500 Ankara Turkiye

This article proposes a digital twin (DT)-based diagnosis and fault-tolerant control for T-type three-level rectifiers. To develop the DT, a dense deep neural network (DNN) machine learning approach is used. The DT is trained offline using a set of experimental data and updated online to get the maximum possible accuracy. Then, the DT is used for the diagnosis and tolerance of open-switch faults (OSFs) and faults related to voltage and current sensors or for sensorless control. The OSF detection and localization algorithm is implemented based on the dynamic response difference between the physical system and its DT. First, the OSF is detected and localized based on the grid current dynamics, where each switch fault generates a specific pattern in the current dynamics. OSF is tolerated by changing the switching function based on the location of the fault. Second, the voltage and current sensor fault is detected when the DT provides a specific amplitude of currents while the physical sensors do not provide a correct measurement. This case is tolerated by feeding back the grid currents or voltages from the DT as an alternative to the physical sensors. The proposed technique has low overhead, enhances the reliability of the power converter, and is applicable for sensorless mode of control. Experimental investigations are conducted to validate the proposed concept.

关键词： Digital twin (DT) fault-tolerant control open-switch fault detection sensor fault detection sensorless control

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Generalized Dynamic Model and Digital-Twin-Based open-switch fault Classification of Multi-Phase Inverters

Generalized Dynamic Model and Digital-Twin-Based Open-Switch...

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2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

作者： Mali, Bijen Lee, Dong-Choon Yeungnam University Department of Electrical Engineering 280 Daehak-Ro Gyeongbuk Gyeongsan Korea Republic of

ISBN: (纸本)9798350316445

In this paper, a comprehensive digital twin system that virtually mimics a two-level multi-phase inverter system in both normal and faulty operation conditions is proposed. Conventional models of the multi-phase inverters only consider normal operation. It is not possible to develop a digital twin system using such models. This paper presents a generalized dynamic model of a multi-phase inverter that produces accurate outputs in open-switch fault conditions. The proposed model can be used to represent multi-phase two-level inverters with a high degree of fidelity. An experimental setup including a six-phase two-level inverter and a digital twin is developed to demonstrate the feasibility of using the proposed model to perform open-switch fault classification. The accuracy of the proposed model is calculated to be 3.15 % by comparing the outputs of the digital twin and hardware. The fault detection and identification were performed in 815.79 μs and 898.74 μs respectively. © 2023 IEEE.

关键词： Digital Twin fault Modeling Multi-phase Inverter open-switch fault detection

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open-switch fault diagnosis in three-level rectifiers based on selective calculation method for instant voltage deviation

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IET POWER ELECTRONICS 2021年第5期14卷 923-935页

作者： Chen, Mingyun He, Yigang Sui, Chunsong Wuhan Univ Sch Elect Engn & Automat Wuhan Peoples R China

This paper presents an open-switch fault detection, and identification method for a neutral-point clamped rectifier system. A new calculation method for phase-to-phase pole voltage deviations is proposed for reducing calculation errors. In this way, the more accurate diagnosis can be achieved. Both single-switch faults, and multiple-switch faults can be identified effectively by using fewer diagnostic variables, which makes the diagnostic method simpler, and more reliable. And all the variables can be simply calculated by signals which are available to the control system of the rectifier, avoiding the use of additional hardware. Moreover, different voltage thresholds are designed for different faulty feature sections to further reduce the diagnostic time. Additionally, a diagnostic result checking method is proposed to avoid the misdiagnosis when considering the effect of outer-switch faults. Finally, experiments are carried out, and the results show the robustness, and effectiveness of the proposed method.

关键词： fault diagnosis phase-to-phase pole voltage deviations Control of electric power systems calculation errors diagnostic result checking method diagnostic method outer-switch faults identification method control system multiple-switch faults diagnostic time instant voltage deviation three-level rectifiers faulty feature sections single-switch faults diagnostic variables additional hardware Power system measurement and metering switch fault diagnosis neutral-point clamped rectifier system selective calculation method rectifiers Voltage control voltage thresholds open-switch fault detection fault location voltage control

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fault detection Method Using a Convolution Neural Network for Hybrid Active Neutral-Point Clamped Inverters

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IEEE ACCESS 2020年 8卷 140632-140642页

作者： Kim, Sang-Hun Yoo, Dong-Yeon An, Sang-Won Park, Ye-Seul Lee, Jung-Won Lee, Kyo-Beum Ajou Univ Dept Elect & Comp Engn Suwon 16499 South Korea

This article presents an open-switch fault detection method for a hybrid active neutral-point clamped (HANPC) inverter based on deep learning technology. The HANPC inverter generates a three-level output voltage with four silicon switches and two silicon carbide switches per phase. The probability of open fault in switching devices increases because of the large number of switches of the entire power converter. The open-switch fault causes distortion of output currents. A convolution neural network (CNN) comprising several convolution layers and fully connected layers is used to extract features of distorted currents. A CNN network was trained using three-phase current information to determine the location of the open-switch fault. Our proposed CNN model can accurately detect approximately 99.6% of open-switch faults without requiring additional circuitry and regardless of the current level within an average time of 1.027ms. The feasibility and effectiveness of the proposed method are verified by experimental results.

关键词： open-switch fault detection hybrid active neutral-point inverter silicon carbide deep learning convolution neural network

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Tolerant Control for Power Transistor faults in switched Reluctance Motor Drives

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IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 2015年第4期51卷 3187-3197页

作者： Ro, Hak-Seung Kim, Dong-Hee Jeong, Hae-Gwang Lee, Kyo-Beum Ajou Univ Dept Elect & Comp Engn Suwon 443749 South Korea

This paper presents a fault identification and tolerant method for switched reluctance motor (SRM) drives. The reliability of a power transistor in a power converter is the source of most problems in several industrial applications. It is critical to correctly diagnosis the faults occurring in a drive system to avoid harmful accidents and to ensure continuity of operation. In this paper, two types of faults, namely, short- and open-circuit faults, are analyzed on the basis of the current patterns of the power transistors of SRM drives. A fault is detected when the measured amplitude of the current differs from that of the normal-state current. A fault-tolerant scheme is applied according to the type of fault. Simulations and experiments are performed on a 1.0-kW SRM drive. The results are presented to verify the validity of the proposed method.

关键词： open-switch fault open-switch fault detection open-switch fault-tolerant scheme short-switch fault short-switch fault detection short-switch fault-tolerant scheme switched reluctance motor (SRM) drive

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Diagnosis of open-switch faults in variable speed drives by stator current analysis and pattern recognition

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IET ELECTRIC POWER APPLICATIONS 2013年第6期7卷 509-522页

作者： Ulises Campos-Delgado, Daniel Angel Pecina-Sanchez, Jose Rivelino Espinoza-Trejo, Diego Roman Arce-Santana, Edgar UASLP COARA Matehuala Mexico

This study addresses the problem of detection and isolation of open-switch faults in voltage source inverters by processing the stator current measurements. First, the resulting post-fault trajectories for the stator currents are analytically derived for single and concurrent faults (21 classes) by using Fourier series. This analysis motivated the proposed approach, which is based on the resulting pattern of the stator currents in the dq-frame after a fault, where a histogram of the trajectory is calculated by dividing the plane in 24 equally spaced sectors. From the calculated histogram, a distinctive signature is associated to each fault trajectory in the dq-plane. Single and double faults in the power semi-conductors are analysed that all provide linearly independent signatures for fault isolation. The proposed isolation methodology is independent of the load torque (system disturbance), supply frequency and only requires the information of the stator currents. Furthermore, since the isolation stage is focused on the angle of the current trajectories in the dq-plane, open- and closed-loop configurations of a variable speed drive can be simultaneously handled. Experimental results with a test bench of 3/4 HP induction motor under single and concurrent faults validated the proposed methodology.

关键词： fault diagnosis Fourier series induction motor drives invertors machine testing pattern recognition power semiconductor devices stators variable speed drives open-switch fault diagnosis variable speed drive pattern recognition open-switch fault isolation open-switch fault detection voltage source inverter stator current measurement post-fault trajectory histogram Fourier series dq-plane dq-frame power semiconductor device isolation methodology load torque supply frequency closed-loop configuration open-loop configuration induction motor machine testing

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