双向交直流变换器桥臂故障多矢量恒频模型预测容错控制

doi:10.19595/j.cnki.1000-6753.tces.190526

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Abstract Due to the transient impact of surge and spike during operation, the leg switch device fault of AC-DC converter will occur and threaten the reliable operation of converter. In the conventional model predictive fault-tolerant control method, only a single vector is selected to act on the bidirectional AC-DC converter with leg fault in each switching cycle, so the frequency is not fixed. It is difficult to track the target vector accurately, and the current harmonic content and power ripple are large as well. In order to reduce the current harmonics and power ripple in AC-DC converter after bridge arm fault under conventional model predictive fault-tolerant control, a multi-vector model constant frequency predictive fault-tolerant control strategy is proposed in this paper. Firstly, the system topology of bidirectional AC-DC converter with leg fault is reconstructed. Then the operation mechanism of fault-tolerant structure and the relationship of voltage vectors are clarified. Secondly, the power prediction model under fault-tolerant operation mode is established. Multiple voltage vectors are used in each switching cycle. The synthetic vector is used to track the target vector. The switching order of each vector is fixed to form constant switching frequency. Finally, the simulation model and experimental platform are built. The results show that under the proposed control strategy, the bidirectional AC-DC converter can operate fault-tolerant operation after the bridge arm fault, and the output current harmonics and power ripples are reduced. The system has good steady-state and dynamic performance.

Key words： Bidirectional AC-DC converter bridge arm fault multi-vector constant frequency model predictive fault-tolerant control fault-tolerant operation

Received: 06 May 2019

PACS:

TM464

Fund:国家自然科学基金（51607159,51707176）,河南省高等学校创新人才资助计划（18HASTIT025）和河南省高等学校重点科研（18A470020,20A470011）资助项目

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	Li Yanyan
	Li Guohao
	Deng Yuan
	Li Qiang
	Jin Nan

Cite this article:

Li Yanyan,Li Guohao,Deng Yuan等. Multi-Vector Constant Frequency Model Predictive Fault-Tolerant Control of Bidirectional AC-DC Converter with Leg Fault[J]. Transactions of China Electrotechnical Society, 2020, 35(10): 2206-2215.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190526 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I10/2206

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