Non-intrusive Online Monitoring Method of DC-link Capacitor and IGBT Open-circuit Fault for Three-level Buck-Boost Converter

被引：0
|
作者：
Cui Y. [1 ]
Li H. [1 ]
Xiang D. [2 ]
Yue P. [1 ]
Yang X. [1 ]
机构：
[1] College of Electrical Power Engineering, Shanghai University of Electric Power, Shanghai
[2] College of Electronics and Information Engineering, Tongji University, Shanghai
来源：
Gaodianya Jishu/High Voltage Engineering | 2023年 / 49卷 / 10期
基金：
中国国家自然科学基金; 上海市自然科学基金;
关键词：
capacitance characteristics; DC-link capacitor; IGBT open-circuit faults; online monitoring; three-level Buck-Boost converter;
D O I：
10.13336/j.1003-6520.hve.20220486
中图分类号：
学科分类号：
摘要：
Three-level Buck-Boost converter possesses characteristics of bidirectional energy feeding and high-efficient energy conversion. The DC-link capacitor capacitance degradation and IGBT open-circuit failure are the two typical failure modes for the three-level Buck-Boost converters. This paper proposes a non-intrusive online monitoring method of DC-link capacitor capacitance degradation and IGBT open-circuit faults simultaneously by using the existing sensors in converter. First, the switching operation modes and switching sequences of the three-level Buck-Boost converter are analyzed. Then, the effect of equivalent series resistance (ESR) is eliminated by utilizing specific switching modes, and the analytical expressions of the sub-module DC-link capacitance characteristics are derived. Finally, the equivalent capacitance characteristics calculated from each switching cycle are used to detect and locate the IGBT open-circuit faults. The simulation and experimental results show that switching mode capacitance features can be used to simultaneously monitor the health state of DC-link capacitor and the IGBT open-circuit fault for the three-level Buck-Boost converter. Specifically, the average capacitance monitoring error of the DC-link capacitor is less than 1% and the effects of ESR can be eliminated. The IGBT open-circuit fault can be detected within 2~3 switching cycles from the distortion of switching mode capacitance features. © 2023 Science Press. All rights reserved.
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页码：4345 / 4354
页数：9
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