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Diagnosis method for open-circuit fault of inverter power tube

A technology of open-circuit faults and diagnostic methods, applied in the directions of instruments, measuring electrical variables, measuring devices, etc., can solve problems such as reducing reliability and increasing costs, and achieve the goal of improving reliability, reducing usage, ensuring effectiveness and robustness. Effect

Active Publication Date: 2016-08-24
ANHUI UNIVERSITY
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  • Application Information

AI Technical Summary

Problems solved by technology

These two voltage detection methods require optocouplers or comparators, which not only increase the cost, but also reduce the reliability

Method used

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  • Diagnosis method for open-circuit fault of inverter power tube
  • Diagnosis method for open-circuit fault of inverter power tube
  • Diagnosis method for open-circuit fault of inverter power tube

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Embodiment Construction

[0033] refer to figure 1 , a method for diagnosing open-circuit faults of inverter power tubes proposed by the present invention is specifically aimed at the inverter bridge composed of power tubes in the inverter. The inverter bridge is composed of three parallel bridge arms, and each bridge arm It consists of upper and lower power tubes. In this embodiment, the three parallel bridge arms are the first bridge arm, the second bridge arm and the third bridge arm, wherein the first bridge arm is composed of the upper tube T1 and the lower tube T2 in series, and the second bridge arm is composed of The upper tube T3 and the lower tube T4 are connected in series, and the third bridge arm is composed of the upper tube T5 and the lower tube T6 connected in series. On the first bridge arm, node 1 is set between the upper tube T1 and the lower tube T2; on the second bridge arm, node 2 is set between the upper tube T3 and the lower tube T4; on the third bridge arm, the upper tube T5 a...

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Abstract

The invention discloses a diagnosis method for an open-circuit fault of an inverter power tube. The diagnosis method comprises the following steps: S1, acquiring a measured value of linear voltage between any two bridge arms of an inverter, taking the measured value as a measured voltage Vijm, estimating the linear voltage between the any two bridge arms according to a preset linear voltage estimation model, taking the linear voltage as an estimated voltage Vije, and performing one-to-one correspondence between the measured voltage Vijm and the estimated voltage Vije, wherein the i and the j represent orders of the two bridge arms respectively, i belongs to {0, 1}, j belongs to {0, 1}, and i is not equal to the j; S2, calculating an error voltage deltaij between the corresponding measured voltage Vijm and the estimated voltage Vije, and judging whether a power tube on one bridge arm generates the open-circuit fault according to an amplitude of the error voltage delta ij and a pulse width; S3, when the power tube generates the open-circuit fault, positioning a fault bridge arm and a fault power tube according to positive polarity and negative polarity of the error voltage delta ij. The invention provides the diagnosis method for the open-circuit fault of the inverter power tube, which can effectively improve the fault diagnosis for safety and reliability of the inverter.

Description

technical field [0001] The invention relates to the technical field of inverter fault diagnosis, in particular to a diagnosis method for an open circuit fault of an inverter power tube. Background technique [0002] Motor drive systems powered by voltage source inverters have been widely used in aerospace, military, and industrial fields, but due to the fragility of power switching devices, they have become the weakest link in the entire system that is most prone to failure. Once the inverter fails, if it is not dealt with in time, it will directly affect the normal operation of the entire system, and in serious cases, life safety will be endangered. Therefore, it is of great practical value to study inverter fault diagnosis methods. [0003] The open circuit fault of the power tube in the inverter is a typical fault. When the converter fails, the physical quantities such as voltage and current in the circuit will change compared with the normal state, and these characteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 丁石川杭俊李国丽王群京陈权
Owner ANHUI UNIVERSITY
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