Method and device used for detecting inverter fault

An inverter and fault technology, which is applied in the field of early warning of the internal support capacitor meltdown failure of the inverter, can solve the problems of high price of instruments and inability to detect, and achieve the effect of simple method and easy realization.

Active Publication Date: 2016-11-23
HUNAN CSR TIMES ELECTRIC VEHICLE
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Problems solved by technology

The instrument used in this method is expensive, and the inverter box cover must be disassembled to detect the capacitor, and the soft breakdown of the capacitor (that is, the static test is good, but the breakdown is damaged during operation) cannot be detected
[0008] When using the fuse blown protection method, only capacitors equipped with fuse protection devices can be tested

Method used

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  • Method and device used for detecting inverter fault
  • Method and device used for detecting inverter fault
  • Method and device used for detecting inverter fault

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Embodiment Construction

[0055]The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0056] There are many types of inverters, but the principle is similar. Therefore, the method of the present invention will be described in detail by taking the currently widely used two-level voltage type three-phase inverter as an example. The inverter circuit of the two-level voltage type three-phase inverter is as follows: figure 1 shown.

[0057] The core part of the inverter circuit includes a three-p...

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Abstract

The invention discloses a method and device for detecting inverter faults. The method includes: after the inverter is in an uncontrollable rectification state and reaches a preset delay value, acquiring the actual current value flowing on the supporting capacitor; Compare the actual current value with the preset current value to determine the state value of the actual current flowing on the support capacitor; integrate the state value with saturation limit; perform zero-crossing detection on the result of the integration, and based on the detection result Determine whether the support capacitor is faulty. The invention only needs to use the voltage and current sensing devices inside the existing inverter to detect the breakdown and melting of the support capacitor on-line and issue an early warning, and the method is simple and easy to implement.

Description

technical field [0001] The invention relates to the technical field of inverter detection, in particular to an early warning method for the melting fault of an internal supporting capacitor of an inverter. Background technique [0002] The inverter circuit in the voltage source inverter includes a supporting capacitor on the DC side, and the supporting capacitor is an integral part of the inverter circuit. The support capacitor is usually a capacitor with modern materials and processes, which is a long-life and highly reliable device. However, the capacitors in the inverter often work in the rated voltage state, even in the overvoltage state; and the switching ripple current generated by the inverter generates heat on the capacitor, which will shorten the service life of the capacitor. When applying capacitors in large quantities, even if the capacitors only work in the rated state, the failure of the capacitors needs to be considered. Especially in the middle and late sta...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 冯江华谭淼陈建明王征宇陈慧民凌岳伦石高峰易慧斌郭淑英
Owner HUNAN CSR TIMES ELECTRIC VEHICLE
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