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Method for diagnosing bridge arm IGBT open-circuit fault of energy storage converter exteriorly

A technology for energy storage converters and open-circuit faults, which is applied to instruments, measuring electrical variables, and measuring devices. It can solve problems such as failure to ensure the normal operation of detection components and complicated detection methods, so as to prevent secondary damage and facilitate installation and testing. , The effect of convenient maintenance

Inactive Publication Date: 2015-04-29
ZHEJIANG UNIV +1
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Problems solved by technology

In addition, the traditional fault diagnosis methods of voltage source converters all install detection elements on the converter, and the detection means are more complicated; when the converter itself fails, it cannot guarantee that the internal detection elements can work normally

Method used

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  • Method for diagnosing bridge arm IGBT open-circuit fault of energy storage converter exteriorly
  • Method for diagnosing bridge arm IGBT open-circuit fault of energy storage converter exteriorly
  • Method for diagnosing bridge arm IGBT open-circuit fault of energy storage converter exteriorly

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] The method for externally diagnosing the IGBT open-circuit fault of the bridge arm of the energy storage converter described in the present invention is not only applicable to the energy storage converter.

[0022] Microcomputer relay protection device is a widely used relay protection device at present. It usually consists of analog quantity acquisition module, switch quantity acquisition module, central processing unit, communication module and man-machine interface module.

[0023] Such as figure 1 As shown, in the installation diagram of the IGBT fault diagnosis and protection device for the energy storage converter bridge, the analog quantity acquisition module of the relay protection device is connected with current transformers TA1, TA2, and TA3, which are used to collect the three-phase current i of the AC side of the converter sa i sb i sc ...

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Abstract

The invention discloses a method for diagnosing the bridge arm IGBT open-circuit fault of an energy storage converter exteriorly. The method comprises the following steps: detecting a three-phase current on the alternating current side of the energy storage converter through a current transformer; calculating the fundamental component, the second harmonic component and the direct current component of the three-phase current through Fourier transform; respectively calculating the second harmonic contents of the three-phase current; when the second harmonic content of any phase in the three-phase current exceeds a preset threshold value, judging that an open-circuit fault occurs in an IGBT of the phase; when the open-circuit fault occurs in the IGBT of any phase in the three-phase current, if the direct current component of the phase is larger than zero, judging that the open-circuit fault occurs in an upper bridge arm IGBT of the phase; if the direct current component of the phase is smaller than zero, judging that the open-circuit fault occurs in a lower bridge arm IGBT of the phase. Based on the second harmonic detection of alternating current and the direct current component detection, the method can accurately and effectively diagnose the bridge arm IGBT open-circuit fault of the energy storage converter, and thus guaranteeing safe and stable operation of an energy storage system.

Description

technical field [0001] The invention relates to a method for externally diagnosing an IGBT open-circuit fault of a bridge arm of an energy storage converter. Background technique [0002] At present, there have been many studies on the fault diagnosis of voltage source converters, but these studies are all focused on the case of DC side with motor driving load, which is different from the case of battery energy storage system. In addition, the traditional fault diagnosis methods for voltage source converters all install detection elements on the converter, and the detection means are more complicated; when the converter itself fails, it cannot guarantee that the internal detection elements can work normally. Contents of the invention [0003] The DC side voltage of the battery energy storage unit is equal to the potential of the DC side power supply, which is equal to the sum of the terminal voltage values ​​of each series-connected battery pack. After the energy storage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
Inventor 徐习东钱德周赵宇明刘国伟姚森敬朱正国
Owner ZHEJIANG UNIV
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