A New Diagnostic Algorithm for Multiple IGBTs Open Circuit Faults by the Phase Currents for Power Inverter in Electric Vehicles

Despite the emerging multi-phase and multi-level converters, two-level insulated gate bipolar transistor-based power converters are still widely used in industrial applications in nowadays. Thus, its reliability is of significant importance for ensuring industrial safety. In this paper, a review of the possibilities to ensure the reliable operation of these power converters is presented. The possible approaches are categorized into two groups: condition monitoring and fault-tolerant control. The former approach performs the monitoring methods of power converters, which enables the identification of device degradation to be realized. Accordingly, the mechanisms, indicators, and measuring methods of degradation are demonstrated in this paper to assist the design of condition-based maintenance. In contrast, the latter approach is a postfault one, where power converters remain the operation by activating the fault-tolerant units after faults are identified. For this approach, fault detection, fault isolation, and tolerant strategies are essential. Finally, the performance and cost-effectiveness of the two categories are discussed in this paper. INDEX TERMS Two-level power converter, reliability, condition Monitoring, fault tolerance, renewable energy application, insulated gate bipolar transistor.

“…b: MEAN CURRENT [113]- [121] If one IGBT is in the open-circuit fault, the three-phase current of the vector-controlled drive system is shown in Fig. 28.…”

Section: ) Signal-based Approachmentioning

confidence: 99%

“…Combining R n (k) and S n (k), in total, 27 kinds of faults can be diagnosed. Consider that the current frequency in the drive system is varying according to the motor speed, the variable parameter moving average method is adopted to calculate the mean value adaptively [121].…”

Section: ) Signal-based Approachmentioning

confidence: 99%

Ensuring a Reliable Operation of Two-Level IGBT-Based Power Converters: A Review of Monitoring and Fault-Tolerant Approaches

Liu

Yang

et al. 2020

“…However, wavelets are easily affected by closed-loop systems. In [28], a method of using half-period phase difference current is proposed to diagnose multi-circuit faults of three-phase motors. This method only needs to collect phase currents to diagnose the multi-circuit points accurately, which improves the independence of diagnosis.…”

Section: Introductionmentioning

confidence: 99%

Open-Circuit Fault Diagnosis of Six-Phase Permanent Magnet Synchronous Motor Drive System Based on Empirical Mode Decomposition Energy Entropy

Zhang

et al. 2021

This paper proposes a method to diagnose the open-circuit faulty phases and faulty points of the six-phase permanent magnet synchronous motor (PMSM) drive circuit. The current sensor is used to obtain the six-phase current signal, and the least mean square error (LMS) adaptive filtering algorithm is used to filter out the vibration and noise. Empirical Mode Decomposition (EMD) is performed on the filtered current signals, and the EMD energy entropy of each phase current signal is calculated. The change of energy entropy can simplify the double-bridge arm open-circuit fault to the single-bridge arm opencircuit fault, which reduces the number of fault characteristics. After the faulty phase is judged by the change of energy entropy, the fault diagnosis system can diagnose the specific faulty point according to the normalized average value of each phase current signal. Finally, the current data of normal state and fault state are used to train the support vector machine (SVM) and classify the fault state. Each type of fault can be accurately diagnosed by substituting experimental data into the SVM. Experimental results prove that the proposed method can accurately diagnose the open-circuit faults of the six-phase PMSM drive system. INDEX TERMS Six-phase permanent magnet synchronous motor, open-circuit fault, empirical mode decomposition, energy entropy, support vector machine.

“…In the torque-controlled motor drive system, the difference between the actual values and the referential values of current through the three phases were calculated by the sampled data acquired in a variable sliding observation window, which is utilize in single switch's open-circuit fault diagnosis in [21]. In addition to the diagnostic variable based on the three-phase stator current over an electrical cycle, the auxiliary diagnostic variable, which is based on the crosscomparison of the three-phase stator current, is presented and used to diagnose multiple open circuit faults in insulated gate bipolar transistors [22]. In short, more attention has been drawn to the diagnosis of multiple power switchers' opencircuit faults.…”

Section: Introductionmentioning

confidence: 99%

A Diagnosis Method of Semiconductor Power Switch Open-Circuit Fault in the PMSM Drive System With the MPCC Method

Deng

2021

The open-circuit fault of semiconductor power switch is a common fault in permanent magnet synchronous motor (PMSM) drive system. If this fault is not detected in time, it will cause abnormal operation of the system, bring economic losses, and even endanger personal safety. Recently, the model predictive current control (MPCC) method is widely used in PMSM drive system due to its simple structure and excellent dynamic performance. However, there are few research works that focus on the open-circuit fault diagnosis of semiconductor power switch in PMSM drive system with MPCC method. The previous fault diagnosis methods are mainly aimed at PMSM drive system with conventional control method. Therefore, this paper proposes a diagnosis method of semiconductor power switch open-circuit fault to improve the reliability of PMSM drive system with MPCC method. The cost function is used to detect the abnormality of PMSM drive system. And the stator current and the drive signal of the semiconductor power switch are used to complete the fault diagnosis. The proposed fault diagnosis method is robust against the operating point and parameter mismatch of PMSM drive system. The simulation results verify the effectiveness of the proposed fault diagnosis method.