A method for judging the abnormality of the converter valve power module by the capacitance state
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: 2021-08-20
CSG EHV POWER TRANSMISSION +1
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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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[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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The present invention proposes a method for judging the abnormality of the power module of the converter valve through the capacitance state, and calculates the capacitance value of the power module through the bridge arm data real-time analysis unit; the background database identifies a certain type of data abnormality; 1) calculates the value of this type of data The average value and standard deviation, for the power module that deviates from the average value of the data and exceeds the standard deviation of the specified multiple, it is identified as an abnormal module; Statistically compare each other in the bridge arms to find abnormal modules; 3) Conduct statistical analysis within a time range for parameters such as the capacitance value of a certain power module and the bit error rate of optical fiber communication. If it is found to be significantly related to time, It means that the state of the power module is abnormal; the deterioration of the power module can be found in advance by comprehensively detecting the capacitance value of each power module and the bit error rate of the communication optical fiber and other parameters.
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...
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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