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Method for predicting service life of metallized film capacitor based on mission profile and aging analysis

A metallized film and task profile technology, which is applied in the fields of instruments, electrical digital data processing, design optimization/simulation, etc., can solve the problems of lack of consideration of the metallized film capacitor life prediction model, etc., to achieve accurate life prediction results and improve reliability , the effect of accurate life model

Active Publication Date: 2020-05-05
XI AN JIAOTONG UNIV
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  • Claims
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Problems solved by technology

[0014] Aiming at the lack of a model for life prediction of metallized film capacitors in combination with capacitance aging and task profile in the prior art, the purpose of the present invention is to propose a method for life prediction of metallized film capacitors based on task profile and aging analysis

Method used

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  • Method for predicting service life of metallized film capacitor based on mission profile and aging analysis
  • Method for predicting service life of metallized film capacitor based on mission profile and aging analysis
  • Method for predicting service life of metallized film capacitor based on mission profile and aging analysis

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Embodiment

[0091] Below in conjunction with specific example the present invention is described in further detail:

[0092] Such as figure 1 As shown, it is a flow chart of the metallized film capacitor life prediction structure based on the task profile and aging analysis of the present invention, and the method includes the following steps:

[0093] Step 1: Determine the actual working condition of the capacitor and obtain the mission profile;

[0094] Taking the MMC system as an example, the structure is as follows figure 2 As shown, the capacitor is selected from The Cornell Dubilier (Type 947D). System parameters and capacitance parameters are shown in Table 1.

[0095] Table 1: Specifications of MMC systems and capacitors

[0096]

[0097] Use MATLAB / Simulink simulation to obtain the profile of capacitor voltage and ripple current, such as image 3 Shown, where (a) is the voltage profile, (b) is the current profile.

[0098] Obtain the annual temperature profile and humid...

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Abstract

The invention discloses a method for predicting the service life of a metallized film capacitor based on a mission profile and aging analysis. The method comprises the following steps: constructing aconstant-stress life model, and obtaining the expected life of the metallized film capacitor under a constant-stress experiment condition; constructing an aging model, considering that internal parameters and stress change under the long-time scale operation of the metallized film capacitor, and obtaining the degradation curve of a capacitor capacitance value and equivalent series resistance undera constant stress experiment working condition; and constructing a segmented integral accumulation damage model, analyzing nonlinear aging caused by changes of internal and external stresses under actual working conditions, and obtaining the expected service life of the metallized film capacitor under the actual working conditions. According to the method disclosed by the invention, the life analysis is performed on the metallized film capacitor and the expected life is obtained by considering the actual operation condition and the capacitor degradation process, and a reference is provided for improving the reliability of the power electronic converter.

Description

technical field [0001] The invention belongs to the field of reliability of power electronic devices, and relates to capacitor life prediction, in particular to a metallized film capacitor life prediction method based on task profile and aging analysis. Background technique [0002] Capacitors are key devices in power electronic converters, often functioning as smooth filters, stable DC voltages, and absorption of high-frequency currents. At the same time, literature shows that capacitors are also one of the most vulnerable components in power electronic systems. Compared with traditional electrolytic capacitors, metallized film capacitors have the advantages of high withstand voltage level, strong reliability, low loss, and low maintenance cost, and have gradually become the first choice for high-voltage large-capacity power electronic converters. [0003] However, in actual engineering applications, the failure of metallized film capacitors still occurs from time to time,...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F111/10G06F119/02G06F119/04
Inventor 张岩吕春林曹瑞刘进军
Owner XI AN JIAOTONG UNIV
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