Fault detection method and device

Abstract

The invention provides a fault detection method and a fault detection device. The fault detection device comprises an energy storage power supply, wherein the energy storage power supply is composed of energy storage power supply modules, and each energy storage power supply module is composed of single super capacitors. The fault detection method comprises the steps of: acquiring a module voltageof each energy storage power supply module during operation of the energy storage power supply; for each energy storage power supply module, calculating to obtain a module voltage equilibrium value and a module voltage fluctuation value based on the module voltage, judging whether the module voltage equilibrium value is greater than a first preset threshold value or not in an acquisition period,and judging whether the module voltage fluctuation value is greater than a second preset threshold value or not in the acquisition period; and if the module voltage equilibrium value is greater than the first preset threshold value in the acquisition period, and / or the module voltage fluctuation value is greater than the second preset threshold value, determining that the energy storage power supply modules have a fault until the determination of all the energy storage power supply modules in the energy storage power supply is completed. The fault detection method and the fault detection device realize the detection of whether the energy storage power supply modules have a fault, and further realizes the purpose of predicting the occurrence of electrolyte leakage or burnout of the energy storage power supply.

Description

technical field [0001] The invention belongs to the technical field of fault detection, and in particular relates to a fault detection method and device. Background technique [0002] A supercapacitor is an electrochemical element that stores energy by polarizing an electrolyte. Supercapacitors are different from traditional chemical power sources. They are a power source with special properties between traditional capacitors and batteries. They mainly rely on electric double layers and redox pseudocapacitive charges to store electrical energy. However, no chemical reaction occurs in the process of its energy storage. This energy storage process is reversible, and it is precisely because this supercapacitor can be repeatedly charged and discharged hundreds of thousands of times. [0003] Because supercapacitors have the characteristics of high power density and long service life, they are suitable for the field of trams and trolleybuses with high power and frequent start an...

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Problems solved by technology

[0006] In view of this, the object of the present invention is to provide a fault detection method and device, which is used to solve the problem that the existing energy storage power supply composed of supercapacitors has no faults so as to realize the prediction of electrolyte leakage or energy storage power failure in the energy storage power supply. Occurrence of burning problem

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