Fault detection method and system, computer device and storage medium

Abstract

The invention relates to a fault detection method and system, a storage medium and a computer device. The method includes the steps of periodically acquiring real-time voltage values of two ends of acapacitor in a soft-start circuit; according to the real-time value acquisition moment of the voltage across the two ends of the capacitor and a preset soft-start curve, obtaining preset values of thevoltage across the two ends of the capacitor corresponding to the real-time value acquisition moment of the voltage across the two ends of the capacitor; when the difference between the voltage real-time values of the two ends of the capacitor and the preset values of the voltage across the two ends of the capacitor is greater than a preset threshold, outputting a soft-start fault instruction; periodically comparing the voltage real-time values of the two ends of the capacitor at a certain moment with the preset values of the voltage across the two ends of the capacitor at the corresponding moment; and if the difference between the voltage actual values and the voltage preset values exceeds the preset threshold, outputting the soft-start fault instruction. The fault detection speed can beadjusted by adjusting the period, a soft-start circuit fault can be detected in real time, the soft-start fault instruction is output in time to control the on-off of the soft-start circuit, and thesoft-start circuit is prevented from being damaged.

Description

technical field [0001] The invention relates to the technical field of power electronic control, in particular to a fault detection method, system, computer equipment and storage medium. Background technique [0002] The soft-start circuit is a circuit often used in power electronic systems, generally including soft-start capacitors, soft-start resistors and control switches, such as the DC of the photovoltaic inverter connected to the high-power battery board, the DC side of the energy storage inverter connected to the battery, etc. etc. In these occasions, the DC side capacitor of the inverter needs to be slowly soft-started and charged through the soft-start circuit. When the capacitor voltage is close to the DC charging voltage, the switch on the output side of the inverter can be closed to complete the soft-start process. . [0003] Under normal circumstances, the soft-start function can be realized through the soft-start circuit, but if the capacitor is short-circuite...

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Problems solved by technology

[0004] The traditional fault detection is to estimate the time required for the soft-start circuit to start. When the soft-start circuit starts to work, it counts. After a certain period of time, it is judged whether the soft-start voltage value has reached the target value. Start failure, this method is feasible under normal circumstances, but when the soft start capacitor is short-circuited or a certain load is connected in parallel, it is impossible to judge the fault, that is, it is impossible to detect the fault of the soft start circuit in real time, resulting in the overcurrent of the soft start circuit. Burn out the soft start circuit

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