Investigation of Fault-Mode Behaviors of Matrix Converters

Sang-Shin Kwak 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.6

This paper presents a systematic investigation of the fault-mode behaviors of matrix converter systems. Knowledge about converter behaviors after fault occurrence is important from the standpoint of reliable system design, protection and fault-tolerant control. Converter behaviors have been, in detail, examined with both qualitative and quantitative approaches for key fault types, such as switch open-circuited faults and switch short-circuited faults. Investigating the fault-mode behaviors of matrix converters reveals that converter operation with switch short-circuited faults leads to overvoltage stresses as well as overcurrent stresses on other healthy switching components. On the other hand, switch open-circuited faults only result in overvoltage to other switching components. This study can be used to predict fault-mode converter behaviors and determine additional stresses on remaining power circuit components under fault-mode operations.

Open‑circuit fault diagnosis of three‑phase PWM rectifier circuits based on transient characteristics and random forest classification

RenZhong Shan,JingBo Yang,ShengLi Huang 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.1

Fault diagnosis is becoming increasingly important in improving the reliability of power electronic devices. The research in this paper focuses on the issue of the faulty operation that can occur after partial IGBT open-circuit faults in three-phase PWM rectifier circuits. To promptly and effectively diagnose faults and to determine their locations, a fault diagnosis method based on transient characteristics and random forest classification is proposed. First, the characteristics of single and double IGBT open-circuit faults in three-phase PWM rectifier circuits are analyzed. It is discovered that these faults do not immediately manifest. Instead, they exhibit fault characteristics in the corresponding time sequence. Then the random forest classifier is trained using transient fault samples from the three-phase PWM rectifier circuit. Finally, generalized testing is performed on data that was not involved in the training process, with an accuracy rate of over 98%. The use of frequency distribution graphs for visual analysis of the diagnostic results solves the problem of diagnosing multiple IGBT open-circuit faults.

Investigation of Fault-Mode Behaviors of Matrix Converters

Kwak, Sang-Shin The Korean Institute of Power Electronics 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.6

This paper presents a systematic investigation of the fault-mode behaviors of matrix converter systems. Knowledge about converter behaviors after fault occurrence is important from the standpoint of reliable system design, protection and fault-tolerant control. Converter behaviors have been, in detail, examined with both qualitative and quantitative approaches for key fault types, such as switch open-circuited faults and switch short-circuited faults. Investigating the fault-mode behaviors of matrix converters reveals that converter operation with switch short-circuited faults leads to overvoltage stresses as well as overcurrent stresses on other healthy switching components. On the other hand, switch open-circuited faults only result in overvoltage to other switching components. This study can be used to predict fault-mode converter behaviors and determine additional stresses on remaining power circuit components under fault-mode operations.

Investigation of Fault-Mode Behaviors of Matrix Converters

곽상신 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.6

This paper presents a systematic investigation of the fault-mode behaviors of matrix converter systems. Knowledge about converter behaviors after fault occurrence is important from the standpoint of reliable system design, protection and fault-tolerant control. Converter behaviors have been, in detail, examined with both qualitative and quantitative approaches for key fault types, such as switch open-circuited faults and switch short-circuited faults. Investigating the fault-mode behaviors of matrix converters reveals that converter operation with switch short-circuited faults leads to overvoltage stresses as well as overcurrent stresses on other healthy switching components. On the other hand, switch open-circuited faults only result in overvoltage to other switching components. This study can be used to predict fault-mode converter behaviors and determine additional stresses on remaining power circuit components under fault-mode operations.

Open-Circuit Fault Diagnosis and Fault-Tolerant Control for a Grid-Connected NPC Inverter

Ui-Min Choi,June-Seok Lee,Blaabjerg, Frede,Kyo-Beum Lee Institute of Electrical and Electronics Engineers 2016 IEEE transactions on power electronics Vol. No.

<P>This paper presents an open-circuit fault detection method for a grid-connected neutral-point clamped (NPC) inverter system. Further, a fault-tolerant control method under an open-circuit fault in clamping diodes is proposed. Under the grid-connected condition, it is impossible to identify the location of a faulty switch by the conventional methods which usually use the distortion of outputs because the distortion of the outputs is the same in some fault cases. The proposed fault detection method identifies the location of the faulty switch and the faulty clamping diode of the NPC inverter without any additional hardware or complex calculations. In the case of the clamping diode faults, the NPC inverter can transfer full rated power with sinusoidal currents by the proposed fault-tolerant control. The feasibility of the proposed fault detection and the fault-tolerant control methods for the grid-connected NPC inverter are verified by simulation and experimental results.</P>

Open-Circuit Fault-Tolerant Control for Outer Switches of Three-Level Rectifiers in Wind Turbine Systems

June-Seok Lee,Kyo-Beum Lee IEEE 2016 IEEE transactions on power electronics Vol.31 No.5

<P>A three-level converter is used as the power converters of wind turbine systems because of their advantages such as low-current total harmonic distortion, high efficiency, and low collector-emitter voltage. Interior permanent magnet synchronous generators (IPMSGs) have been chosen as the generator in wind turbine systems owing to their advantages of size and efficiency. In wind turbine systems consisting of the three-level converter and the IPMSG, fault-tolerant controls for an open-circuit fault of switches should be implemented to improve reliability. This paper focuses on the open-circuit fault of outer switches (S-x1 and S-x4) in three-level rectifiers (both neutral-point clamped and T-type) that are connected to the IPMSG. In addition, the effects of S-x1 and S-x4 open-circuit faults are analyzed, and based on this analysis, a tolerant control is proposed. The proposed tolerant control maintains normal operation with sinusoidal currents under the open-circuit fault of outer switches by adding a compensation value to the reference voltages. The effectiveness and performance of the proposed tolerant control are verified by simulation and experiment.</P>

A Fault Diagnosis Method in Cascaded H-bridge Multilevel Inverter Using Output Current Analysis

June-Hee Lee,June-Seok Lee,Kyo-Beum Lee 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.6

Multilevel converter topologies are widely used in many applications. The cascaded Hbridge multilevel inverter (CHBMI), which is one of many multilevel converter topologies, has been introduced as a useful topology in high and medium power. However, it has a drawback to require a lot of switches. Therefore, the reliability of CHBMI is important factor for analyzing the performance. This paper presents a simple switch fault diagnosis method for single-phase CHBMI. There are two types of switch faults: open-fault and short-fault. In the open-fault, the body diode of faulty switch provides a freewheeling current path. However, when the short-fault occurs, the distortion of output current is different from that of the open-fault because it has an unavailable freewheeling current flow path due to a disconnection of fuse. The fault diagnosis method is based on the zero current time analysis according to zero-voltage switching states. Using the proposed method, it is possible to detect the location of faulty switch accurately. The PSIM simulation and experimental results show the effectiveness of proposed switch fault diagnosis method.

Fault diagnosis scheme for single and simultaneous open-circuit faults of voltage-source inverters on the basis of fault online simulation

Chen, Tao,Pan, Yuedou,Xiong, Zhanbo The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.2

This paper presents a fault online simulation (FOS)-based diagnosis scheme for single and simultaneous open-circuit faults of voltage-source inverters in closed-loop-controlled permanent magnet synchronous motor (PMSM) drive systems. First, the hybrid model (HM) of the motor drive system is established, and the current observer is designed according to the normal HM to detect the fault. This approach can eliminate the effects of speed and load transients and significantly improve the immunity to false alarms. The fault class is then judged according to the current vector phase to reduce the computation load and improve diagnostic reliability. Finally, the fault is isolated on the basis of the FOS technique, the possible fault types are simulated online using the HM, and the simulated residuals between the simulated and measured currents are used for fault isolation. The suggested method avoids extra sensors, is robust to false alarms, and has a relatively fast diagnosis speed. Simulations and experiments validate the proposed diagnosis scheme.

Fault Analysis and Fault-Tolerant Method of Dual Active Bridge Converter under Triple Phase Shift Control

Haochen Shi,Huiqing Wen,Jinglin Li 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

The open circuit fault on switches serious threat safe operation of DAB converter. In this paper, the fault phenomena of different switches during various operation condition under triple phase shift control is presented. Based on those analysis, the advanced fault diagnose which uses midpoint voltage as diagnosis criteria. It can ensure fast detect and accurate locate failure switch. After the failure switch is located, fault-tolerant is presented to maintain power transmission ability of DAB converter and ensure safe operation. Experimental result of proposed open circuit fault performance, fault diagnose method and fault-tolerant method is validated with experimental result.

Fault tolerance for PWM rectifiers based on basic voltage space vector model

Chao Sun,Yingning Qiu 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.7

A new basic voltage space vector model-based fault tolerance method from new perspective of vector reconstruction for generator side converter open circuit faults is proposed in this paper. In the space vector model, changes of voltage space vectors under single and multiple switch open-circuit fault conditions are summarized in mathematical expressions. The corrected voltage space vectors under fault conditions are essentially linear superpositions of normal voltage space vectors and the changes introduced by their corresponding faulty switches. The new fault tolerance method, which is developed based on a basic voltage vector model, uses reconstructed basic voltage space vectors to compensate the reference voltage vector. It realizes full-scale fault-tolerant compensation. The feasibility and superiority of the proposed fault-tolerant method are tested and compared on an experimental platform. The achieved superior system performance of the proposed fault tolerance method sufficiently demonstrates its effectiveness as well as the voltage vector deviation principle presented in this paper. It provides important insights into the fault tolerance control of power converters.