基于电压和电流特征的双馈风电变流器功率器件开路故障综合诊断

doi:10.19595/j.cnki.1000-6753.tces.L90287

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Abstract Open-circuit fault monitoring and identification for power converter devices are of the utmost importance for improving the intelligence operations for doubly-fed wind power system. Aiming at the problems that the existing diagnosis methods are difficult to achieve fault monitoring and identification simultaneously for power devices based on the converter voltage or current single feature and fixed threshold, a comprehensive diagnosis method of fault monitoring based on converter DC-bus voltage and fault identification based on the rotor current is proposed. First of all, theoretical analysis of the influence of power device failure of the converter on the DC-bus voltage. According to the cumulative sum (CUSUM) algorithm, an open-circuit fault monitoring method of power devices based on the feature of DC-bus voltage is put forward. Secondly, in view of the non-stationary characteristic and fixed threshold of the rotor current, a fault identification method based on the normalized output current average value and absolute average value as the fault feature and adaptive threshold is presented. Finally, to verify the effectiveness of the proposed method with the different power devices open-circuit faults simulation, and the robustness is validated by the scenes of stochastic wind and grid voltage drop. At the same time, the accuracy of the simulation analysis is verified by testing the typical open-circuit fault of the power device. The simulation and experimental results show that, the proposed method could accurately realize the comprehensive diagnosis of the power converter devices open- circuit fault.

Key words： Doubly-fed wind power converter power device open-circuit fault cumulative sum algorithm adaptive threshold comprehensive fault diagnosis

Received: 09 July 2020

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TM46

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	Li Hui
	Yang Tian
	Tan Hongtao
	Zhou Zhiting
	Zheng Jie

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Li Hui,Yang Tian,Tan Hongtao等. Comprehensive Diagnosis of Open-Circuit Fault for Power Devices of Doubly-Fed Wind Power Converter Based on the Features of Voltage and Current[J]. Transactions of China Electrotechnical Society, 2021, 36(16): 3433-3445.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L90287 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I16/3433

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