Fault determination method, device and equipment for direct-current charging pile

Abstract

The invention provides a fault determination method, device and equipment for a direct-current charging pile. The method comprises the following steps: obtaining the output voltage waveform and the output current waveform of the direct-current charging pile, the initial temperature of a direct-current charging pile socket before charging and the charging temperature of the direct-current chargingpile socket during charging; analyzing the output voltage waveform and the output current waveform by adopting an FFT algorithm, and calculating to obtain the amplitude of each harmonic component of the voltage, the amplitude of the direct current component of the voltage, the amplitude of each harmonic component of the current and the amplitude of the direct current component of the current; calculating a voltage waveform distortion rate and a current waveform distortion rate; calculating the temperature rise of the charging pile socket according to the charging temperature and the initial temperature; and determining the fault of the DC charging pile according to the voltage waveform distortion rate, the current waveform distortion rate and the temperature rise. According to the fault determination method for the direct-current charging pile, the dual criteria of the direct-current signal waveform distortion rate and the temperature are used, the judgment accuracy is improved, and major accidents are reduced or avoided.

Description

technical field [0001] The invention relates to the technical field of fault prediction, in particular to a fault determination method, device and equipment for DC charging piles. Background technique [0002] In August 2019, the New Energy Vehicle National Big Data Alliance released the "New Energy Vehicle National Supervision Platform Big Data Safety Supervision Achievement Report". A total of 79 safety accidents involving 96 vehicles were discovered on the national regulatory platform for new energy vehicles. In the early morning of April 28, 2020, a vehicle fire and explosion occurred at the Tangwei new energy vehicle charging station in Shenzhen. A total of 5 new energy vehicles were damaged to varying degrees. As the number of new energy vehicles continues to grow, the number of DC charging piles (also known as non-vehicle DC charging piles) is increasing. In order to achieve fast charging, the power and charging current of the DC charging pile are also increasing, t...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a fault determination method, device and equipment for DC charging piles, which are used to overcome the technical problem that the charging pile fault method in the prior art cannot judge internal potential hidden dangers

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