基于相电流瞬时频率估计的永磁直驱风电变流器开路故障诊断

doi:10.19595/j.cnki.1000-6753.tces.200775

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Abstract To improve the stability and reliability of wind turbine converters based on permanent magnet synchronous generator (PMSG), a new diagnosis method for multiple open-circuit faults based on the estimated instantaneous frequency of phase current is provided. In this method, the weighted sliding Hilbert transform is developed to estimate the instantaneous frequency of phase current firstly. Then, the normalized instantaneous frequency of phase current is used as the principle quantity to construct new diagnostic variables. Subsequently, by the extended average value method of phase current, the faulty IGBTs can be located. This method can diagnose 21 fault types of PMSG-side converters and gird-side converters simultaneously without using Park's vector transformation and a large number of fault samples, while avoiding the additional sensors. Meanwhile, this method has more obvious fault features and strong robustness. The effectiveness and robustness of the proposed diagnosis method are verified by the experimental results.

Key words： Wind converters open-circuit fault permanent magnet synchronous generator (PMSG) based wind generation system instantaneous frequency estimation weighted sliding Hilbert transform

Received: 02 July 2020

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TM464

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	Xu Shuiqing
	Tao Songbing
	He Yigang
	Chai Yi

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Xu Shuiqing,Tao Songbing,He Yigang等. Open-Circuit Fault Diagnosis for Back-to-Back Converter of PMSG Wind Generation System Based on Estimated Instantaneous Frequency of Phase Current[J]. Transactions of China Electrotechnical Society, 2022, 37(2): 433-444.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.200775 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I2/433

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