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
CN110749797AActive Publication Date: 2020-02-04CSG EHV POWER TRANSMISSION +1
7 Cites 8 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CSG EHV POWER TRANSMISSION
Publication Date
2020-02-04

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More