OPEN CIRCUIT FAULT DIAGNOSIS OF DC CHARGING PILE VIENNA RECTIFIER BASED ON FREQUENCY DOMAIN FAULT CHARACTERISTICS

Hu Yaogang; Jiang Neng; Ran Linxiang; Li Weilin; Li Junhong

doi:10.19912/j.0254-0096.tynxb.2024-2362

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (5) : 70-80. DOI: 10.19912/j.0254-0096.tynxb.2024-2362

OPEN CIRCUIT FAULT DIAGNOSIS OF DC CHARGING PILE VIENNA RECTIFIER BASED ON FREQUENCY DOMAIN FAULT CHARACTERISTICS

Hu Yaogang, Jiang Neng, Ran Linxiang, Li Weilin, Li Junhong

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Abstract

The open circuit fault of the Vienna rectifier of the DC charging pile in the microgrid will cause AC current distortion and then introduce harmonic current to the microgrid. Because the line impedance between the distributed power sources and the point of common coupling （PCC） is inconsistent, the harmonic power between the power sources cannot be evenly distributed, affecting the safe operation of the microgrid. It is necessary to diagnose the fault location of the power devices in time to determine the source and cause of harmonics in the microgrid, which plays an important role in reducing the maintenance time and cost of the charging pile, improving the utilization rate of the charging pile and the operation reliability of the microgrid. In this paper, aiming at the open circuit fault of single or two power devices, the frequency domain characteristic system of DC charging pile open circuit fault and its fault diagnosis method are developed. Firstly, considering the influence factors such as voltage fluctuation of microgrid, noise interference and load difference of battery packs of different types of electric vehicles, aiming at the problem that it is difficult to obtain effective fault diagnosis results by using single or a small number of frequency domain fault characteristics, the fault characteristics system of DC charging pile is constructed. Secondly, in order to realize the open circuit fault diagnosis of Vienna rectifier, RBF neural network is applied to build the fault diagnosis model of the Vienna rectifier of the DC charging pile. Finally, simulation and experimental results show that the proposed open circuit fault frequency domain characteristic system and open circuit fault diagnosis method are effective; Compared with the existing fault diagnosis methods, the proposed diagnosis method has the highest accuracy in the case of noise interference and microgrid voltage imbalance.

Key words

DC charging piles / Vienna rectifier / fault diagnosis / frequency domain characteristics / microgrid / neural network

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Hu Yaogang, Jiang Neng, Ran Linxiang, Li Weilin, Li Junhong. OPEN CIRCUIT FAULT DIAGNOSIS OF DC CHARGING PILE VIENNA RECTIFIER BASED ON FREQUENCY DOMAIN FAULT CHARACTERISTICS[J]. Acta Energiae Solaris Sinica. 2026, 47(5): 70-80 https://doi.org/10.19912/j.0254-0096.tynxb.2024-2362

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