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Method for judging abnormality of converter valve power module according to capacitor status

A power module and state judgment technology, which is applied in the direction of measuring electricity, electrical components, measuring electrical variables, etc., can solve problems such as incomplete detection, tight construction schedule, and heavy workload

Active Publication Date: 2020-02-04
CSG EHV POWER TRANSMISSION +1
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  • Abstract
  • Description
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Problems solved by technology

[0005] When the converter valve is planned to be overhauled, the construction period is usually very tight. The current practice is to conduct functional tests, pulse tests, and bypass tests on all power modules in sequence. The workload is heavy and the tests are not thorough.

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  • Method for judging abnormality of converter valve power module according to capacitor status
  • Method for judging abnormality of converter valve power module according to capacitor status
  • Method for judging abnormality of converter valve power module according to capacitor status

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Embodiment Construction

[0032] The specific embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] The flexible DC converter valve generally includes 6 bridge arms, and each bridge arm includes a large number of power modules, including full-bridge power modules, such as figure 1 shown, and half-bridge power modules, such as figure 2 shown. In order to ensure the reliability of the converter valve, the health status monitoring system of the present invention monitors the health status of each power module, relies on the statistical comparison of the characteristic parameters of each power module, and performs time correlation analysis on the characteristic parameters of the power modules. Find the power module with abnormal health status, so that targeted repair and maintenance can be carried out, and system reliability can be improved. The health status monitoring system of the converter valve of the present inventio...

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Abstract

The present invention provides a method for judging abnormality of a converter valve power module according to capacitor status. A capacitance value of the power module is calculated through a bridgearm data real-time analysis unit; a background database identifies a certain type of data abnormality; 1) a mean value and a standard deviation of this kind of data are calculated; the power module which deviates from the mean value of the data by more than a specified multiple of the standard deviation is determined as an abnormal module; 2) the parameters such as the capacitance values and optical fibre communication bit error rates of all power modules of one bridge arm are statistically compared with each other in the bridge arm to find out the abnormal module; 3) the parameters of one bridge arm such as the capacitance value and optical fibre communication bit error rate are statistically analyzed in a time range; if the parameters are significantly correlated with time, the power module is abnormal. The deterioration of the power module can be detected in advance by comprehensively detecting the parameters such as the capacitance value and communication optical fiber bit error rate of each power module.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a method for judging the abnormality of a power module of a converter valve based on a capacitance state. Background technique [0002] Flexible DC transmission has the advantages of small output harmonics, fast and controllable power factor, and no short-circuit ratio limit of the access system. It has been widely used in the field of power transmission in recent years. Among them, the modular multilevel converter is one of the main methods to realize the flexible DC transmission system. In the modular multilevel topology, a bridge arm is composed of multiple power modules connected in series. In order to improve system reliability, a certain proportion of redundant power modules is generally included in the bridge arm of the flexible DC converter valve. When any one or several power modules in the bridge arm fail, the bypass switch in the corresponding power module w...

Claims

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Application Information

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IPC IPC(8): G01R31/00H04L12/26
CPCG01R31/00H04L43/0847
Inventor 周竞宇翁海清易荣胡雨龙余琼任成林
Owner CSG EHV POWER TRANSMISSION
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