Rong Cai, Liming Song, Qibin Xiong, Bo Yang, Xiaofeng Dong, Kun Huang
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引用次数: 0
Abstract
Fault diagnosis plays a significant role in improving the reliability of T-type three-level inverters. Therefore, a method for diagnosing the IGBT open-circuit faults of T-type three-level inverters based on vector 3D offset is proposed in this paper. The characteristics of the voltage vector shift in single-switch open-circuit faults under three-dimensions are analyzed. In the first dimension, the fault phase was identified by the different offset of three-phase voltage vectors at the polar coordinates. In the second dimension, the output voltage vectors were mapped to the common-mode voltage level in space, and faulty bridge arms were identified by the transition direction of the common-mode voltage. In the third dimension, the specific faulty transistor within a set of bridge arms was identified by the voltage difference between the upper and lower capacitors on the DC side, which was caused by the regional shift of the voltage vectors in the plane. Experimental results show that the proposed method can effectively diagnose the OC faults of 12 switches in T-type three-level inverters. The key advantages of the proposed method are its capability to significantly enhance fault diagnosis speed, bolster diagnostic robustness, and remain impervious to variations in load and modulation coefficients. Moreover, it eliminates the need for additional sampling circuits.
故障诊断对提高 T 型三电平逆变器的可靠性具有重要作用。因此,本文提出了一种基于矢量三维偏移的 T 型三电平逆变器 IGBT 开路故障诊断方法。本文分析了单开关开路故障中电压矢量三维偏移的特征。在第一个维度中,通过三相电压矢量在极坐标上的不同偏移来识别故障相位。在第二个维度中,将输出电压矢量映射到空间共模电压电平,并通过共模电压的转换方向识别故障桥臂。在第三个维度中,通过直流侧上下电容器之间的电压差(由平面上电压矢量的区域移动引起)来识别一组桥臂中的特定故障晶体管。实验结果表明,所提出的方法能有效诊断 T 型三电平逆变器中 12 个开关的 OC 故障。所提方法的主要优点是能显著提高故障诊断速度,增强诊断鲁棒性,并且不受负载和调制系数变化的影响。此外,它还无需额外的采样电路。
期刊介绍:
The scope of Journal of Power Electronics includes all issues in the field of Power Electronics. Included are techniques for power converters, adjustable speed drives, renewable energy, power quality and utility applications, analysis, modeling and control, power devices and components, power electronics education, and other application.