Method and device for detecting filter inductance

Abstract

The invention provides a detection method of filter inductance. The detection method of filter inductance includes the steps: applying a pulse signal with the time t to an inversion circuit switch before grid connection; performing high frequency sampling on the current of filter inductance in real time; and based on the acquired current of the filter inductance, determining whether the filter inductance is abnormal. The detection method of filter inductance can effectively detect whether the filter inductance fails while not increasing extra devices. The invention also discloses a detection apparatus of filter inductance.

Description

technical field [0001] The invention relates to the technical field of fault detection, in particular to a detection method and device for filter inductance. Background technique [0002] When converting DC to AC, the AC filter inductor output by the inverter plays a role in smoothing and filtering the AC output current. It can be seen that the filter inductor plays a role in the process of converting DC to AC by the inverter. important role. The filter inductor is a self-made part. Due to the difference in manufacturing process, there is a risk of failure after handling, installation, vibration or long-term aging operation. Therefore, it is necessary to test the filter inductor to determine whether it is invalid. [0003] At present, it is usually judged whether the filter inductor is invalid by adding a temperature sensor to the filter inductor. When the temperature detected by the temperature sensor is higher than the normal maximum operating temperature of the filter i...

AI Technical Summary

Problems solved by technology

It can be seen from this that, in the existing detection methods for filter inductors, on the one hand, the addition of temperature sensors increases the cost, and increases the difficulty of manufacturing process of filter inductors, the consistency is difficult to control, and the circuit of temperature sensors is also difficult Long, difficult wiring, and other components may be damaged when the temperature is abnormal

On the other hand, if the filter inductor of the inverter fails before the whole machine is running, the existing detection method cannot judge whether the filter inductor has failed before the whole inverter is running.

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