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Reliability Evaluation Method of Modular Multilevel Converter

A modular multi-level, reliable technology, applied in the field of power system, can solve the problem of low reliability of MMC

Inactive Publication Date: 2021-06-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the bridge arm of MMC is composed of dozens or hundreds of standard sub-modules, the reliability of MMC is low due to the large number of series components

Method used

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  • Reliability Evaluation Method of Modular Multilevel Converter
  • Reliability Evaluation Method of Modular Multilevel Converter
  • Reliability Evaluation Method of Modular Multilevel Converter

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Experimental program
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Embodiment Construction

[0062] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0063]It should be understood that when used in the present specification and appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude one or more other Presence or addition of features, wholes, steps, operations, elements, components and / or collections thereof.

[0064] It should also be und...

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Abstract

The invention discloses a method for evaluating the reliability of a modularized multilevel converter. The method includes: step 1, sampling the life of components composed of modules to obtain the life distribution of the sub-modules; step 2, updating the The life distribution of the submodule; step 3, when solving the failure of the i-th submodule, there are at least j the probability distribution of the failure of the module; step 4, solving the i-th submodule failure and is The probability distribution of the jth fault; step 5, accumulating to obtain the probability distribution of reliable operation of the bridge arm; step 6, calculating the reliability distribution of the modular multilevel converter. The invention breaks through the limitation that the existing methods cannot quantify the life of the sub-modules and the reliability of the cold standby MMC, has fast calculation speed, and is suitable for component selection, redundant design and maintenance decision-making of modular multilevel converters.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a method for evaluating the reliability of a modular multilevel converter. Background technique [0002] With high-quality voltage waveform, low modulation frequency, small power loss, etc., Modular Multilevel Converter (MMC) is very suitable for high-voltage and high-power applications. In the past 15 years, with breakthroughs in topology, waveform control, modulation strategy, fault removal, and manufacturing process, MMC has been successfully commercialized, and recently it has been piloted in the fields of solid-state transformers, high-speed railways, and electric vehicle power applications. Since the bridge arm of the MMC is composed of tens or hundreds of standard sub-modules, the reliability of the MMC is low due to the large number of series components. However, as the core component of power exchange, MMC's reliability is more related to the reliabili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M7/4835
Inventor 关玉衡付炜汪隆君
Owner SOUTH CHINA UNIV OF TECH