A Unified Open-Circuit Fault Diagnosis and Condition Monitoring Method for Three-Level T-Type Inverter

被引:8
作者
Zhang, Weiwei [1 ]
He, Yigang [1 ]
Chen, Jianfei [1 ]
Du, Bolun [2 ]
机构
[1] Wuhan Univ, Wuhan 430072, Peoples R China
[2] China Elect Power Res Inst, Wuhan 430000, Peoples R China
基金
中国国家自然科学基金;
关键词
Condition monitoring (CM); fault diagnosis (FD); ON-state voltage (OV); open-circuit (OC) fault; three-level T-type (3L-T) inverter; POWER-ELECTRONIC CONVERTERS; ACCURATE MEASUREMENT; RELIABILITY; TIME; RESISTANCE; FREQUENCY; MODULE;
D O I
10.1109/TPEL.2022.3232996
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Traditional fault diagnosis (FD) and condition monitoring (CM) methods for three-level T-type (3L-T) inverters are studied separately, which is not conducive to guaranteeing the reliability of the 3L-T inverter in an all-around way. This article presents a unified open-circuit FD and CM method for the 3L-T inverter based on the proposed on-state voltage measurement circuit (OVMC). The designed OVMC comprises a voltage limiter, an absolute value circuit, and a minimum value circuit, separating all the OVs and actual switching state information with a few devices and terminals. The corresponding sampling method is designed under the space vector pulsewidth modulation mode, and the sampling frequency is only twice the switching frequency. Three exceptional cases are considered during the implementation to achieve accurate OV sampling. The proposed method for fault locating requires only a straightforward lookup table without complicated feature extraction and threshold setting steps. Meanwhile, the FD results would help to correct the OV distribution. Experimental results demonstrate that the proposed unified FD and CM method merits high measurement accuracy, fast response speed, and short FD time.
引用
收藏
页码:5376 / 5391
页数:16
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