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MMC maintenance cycle determination method and system based on sub-module status monitoring

A technology for maintenance cycle and determination method, which is applied in output power conversion devices, instruments, data processing applications, etc., and can solve problems such as unreliable maintenance cycles.

Active Publication Date: 2021-01-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method and system for determining the MMC maintenance cycle based on sub-module status monitoring, which can solve the problem of unreliable maintenance cycle

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  • MMC maintenance cycle determination method and system based on sub-module status monitoring
  • MMC maintenance cycle determination method and system based on sub-module status monitoring
  • MMC maintenance cycle determination method and system based on sub-module status monitoring

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Embodiment Construction

[0066] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0067] The purpose of the present invention is to provide a method and system for determining the MMC maintenance cycle based on sub-module state monitoring, which can solve the problem of unreliable maintenance cycle.

[0068] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodime...

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Abstract

The invention relates to a method and system for determining an MMC maintenance period based on submodule state monitoring, comprising: determining the failure rate and first failure of the first submodule according to the preset maintenance period, the number of submodules, and the preset failure probability density of the submodules The number of sub-modules, according to the above-mentioned data and the number of first actual faulty sub-modules, determine the failure probability density of the first corrected sub-module; determine the corresponding second data according to the above-mentioned method; determine the failure rate of the current sub-module according to the reliability index; then determine the current Maintenance cycle; maintain the current actual number of faulty sub-modules according to the current maintenance cycle; then determine the current estimated number of faulty sub-modules; finally determine the failure probability density of the sub-modules in the next cycle; update the current sub-module failure probability density to the current sub-module Failure probability density, and return to re-determine the failure rate of the current sub-module, and adjust the maintenance cycle of the next cycle. The above method of the present invention can solve the problem of unreliable maintenance period.

Description

technical field [0001] The invention relates to the technical field of power conversion and transmission, in particular to a method and system for determining an MMC maintenance period based on submodule status monitoring. Background technique [0002] In recent years, the modular multilevel converter (MMC) has been widely used in HVDC transmission systems. Its main circuit is composed of three phase units a, b and c, and each phase unit is composed of It consists of upper and lower bridge arms, each of which is composed of a certain number of sub-modules connected in series, and several redundant sub-modules are set in each bridge arm, such as figure 2 As shown, the MMC can operate normally only when the sub-modules of each bridge arm working normally are not lower than a certain value. In order to ensure the operational reliability of the MMC and reduce the probability of failure, it is necessary to maintain the MMC. Most of the existing maintenance methods are based on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32H02M7/00H02J3/36G06Q10/00G06Q10/06G06Q50/06
CPCG06Q10/0639G06Q10/20G06Q50/06H02J3/36H02M1/32H02M7/00H02M1/0067Y02E60/60
Inventor 袁敞邱俊卿戴笃猛陈璐
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)