The Fault Tolerance Control Method in Three-level T-type Inverter Parallel System

被引：0
|
作者：
Chen Z. [1 ]
Chen J. [1 ]
Xing X. [1 ]
Li X. [1 ]
Fu Y. [1 ]
Zhang C. [1 ]
机构：
[1] School of Control Science and Engineering, Shandong University, Jinan
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2021年 / 41卷 / 20期
基金：
中国国家自然科学基金;
关键词：
Fault tolerance control (FTC); Safe and reliable operation; The parallel system; Three-level T-type inverter; Zero sequence circulating current (ZSCC) suppression;
D O I：
10.13334/j.0258-8013.pcsee.201946
中图分类号：
学科分类号：
摘要：
Parallel operation of inverters is the keyway to realize the system's large capacity and power control, but current distortion and poor stability caused by the zero-sequence circulating current (ZSCC) between parallel inverters will follow. In addition, with the huge increase of the number of power switches in the parallel system, combined with the complexity and change of operating conditions and its own aging, the failure rate of the switches will increase accordingly. However, none of the existing literatures provide a fault tolerance control (FTC) method under ZSCC suppression in parallel systems. Therefore, this paper proposed FTC method based on ZSCC suppression. First, a ZSCC controller based on "proportion+feedforward" was constructed to adjust the difference of zero-sequence duty ratio of the two inverters in real time, which completed the suppression of ZSCC of the parallel system. Then, by changing the state switching mode of the fault phase in real time and combining with the criterion of "area equivalent principle", the switching sequence was reconstructed, and the FTC under the open circuit fault of the switches was realized without affecting the suppression of the ZSCC. Compared with the existing methods, the method in this paper not only realizes the suppression of the ZSCC, but also completes the FTC under the open circuit fault of the switches. It significantly improves the power quality of the AC side of the parallel system during the normal operation and the operation under the switches fault, and effectively guarantees the safe and reliable operation of the system. Finally, the simulation and experiment verified the feasibility and correctness of the proposed method. © 2021 Chin. Soc. for Elec. Eng.
引用
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页码：7079 / 7092
页数：13
相关论文
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