Intelligent detection apparatus for alternating-current filter inductance of inverter

Abstract

The invention discloses an intelligent detection apparatus for alternating-current filter inductance of an inverter. The intelligent detection apparatus comprises an A-phase inductance voltage detection unit, a B-phase inductance voltage detection unit, a C-phase inductance voltage detection unit, an A-phase inductance current detection unit, a B-phase inductance current detection unit, a C-phase inductance current detection unit, a sampling circuit, a controller, a display device, and a single-stage / dual-stage inverter topological unit. The sampling circuit consists of a first-stage difference proportional circuit, a second-stage voltage conditioning circuit, a third-stage emitter follower circuit, a fourth-stage filter circuit, and a fifth-stage amplitude limiting circuit. According to the invention, a method for inductance fault detection based on devices carried by an inverter is provided. No detection instrument and manpower cost are increased; the intelligent effect of the inverter fault detection is realized; the installation and maintenance staff can carry out operation conveniently; and reliability and stability of the inverter system are improved.

Description

[0001] An intelligent detection device and a detection method for an inverter AC filter inductance. technical field [0002] The invention relates to the field of filters, in particular to an intelligent detection device and a detection method for inverter AC filter inductance. Background technique [0003] Inverter filter inductors are large in size and weight, especially in applications such as high-power industrial inverters, power station photovoltaic inverters, and active filters. Due to the low switching frequency of these devices and the two-level topology, the size and weight of the filter inductor are larger, which brings great difficulties to installation and fixing. During long-distance transportation, the inverter filter inductor may loosen and fall off. If the fault cannot be checked and eliminated in time, voltage and current distortion will occur after the inverter is started up, and even secondary disasters such as short circuit and fire will occur. [0004]...

AI Technical Summary

Problems solved by technology

Due to the low switching frequency of these devices and the use of two-level topology, the size and weight of the filter inductor are larger, which brings great difficulties to installation and fixing.

During long-distance transportation, the inverter filter inductor may loosen and fall off. If the fault cannot be checked and eliminated in time, the voltage and current distortion will occur after the inverter starts up, and even secondary disasters such as short circuit and fire will occur.

[0004] At present, the detection of inductance faults requires the use of instruments and meters, or visual inspection. These methods have the problems of high cost and long detection cycle.

In addition, due to the large number of inverters in some engineering projects, the installation is distributed in a large area, which brings many difficulties to human detection.

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