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Locating method for open-circuit faults of lower tubes of sub-modules of modular multilevel converters

A modular multi-level, open-circuit fault technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as unsuitable converters, to ensure power supply quality, The effect of great flexibility and practical value

Active Publication Date: 2020-09-22
SOUTHEAST UNIV +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the modular multilevel converter works in the rectification state, the capacitor voltage can maintain balance, so the fault location method in the traditional literature is not suitable for the converter in the rectification state

Method used

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  • Locating method for open-circuit faults of lower tubes of sub-modules of modular multilevel converters
  • Locating method for open-circuit faults of lower tubes of sub-modules of modular multilevel converters
  • Locating method for open-circuit faults of lower tubes of sub-modules of modular multilevel converters

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Embodiment Construction

[0020] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings.

[0021] The present invention aims at the problem of open-circuit faults in the lower tube of the sub-module, and proposes a fault location method suitable for MMC, wherein the three-phase MMC topology is composed of six bridge arms, such as figure 1 As shown, each bridge arm contains N identical submodules (Submodule, SM) and a bridge arm inductance L s , the sub-module adopts a half-bridge structure, such as figure 2 As shown, each sub-module consists of two power switches T 1 , T 2 , two diodes D 1 、D 2 And a capacitor, the capacitor voltage balance method is: according to the bridge arm reference voltage and carrier comparison, the number of sub-modules that need to be input on a bridge arm is j, and all capacitor voltages are sorted. When the bridge arm current is greater than zero, input capacitor voltage For the lowest j sub-modules, whe...

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Abstract

The invention discloses a modular multilevel converter sub-module lower tube open-circuit fault locating method, relates to a multilevel power electronic converter technology, and belongs to the technical field of calculating, reckoning and counting. According to the method, the capacitor voltage of each sub-module on a bridge arm is monitored and sampled, and fault locating is performed by usingthe total value and the average value of the deviation between the capacitor voltage increment and the maximum increment of each sub-module in each power frequency period. According to the method, thecapacitor voltage of the sub-module is continuously sampled to obtain two characteristic values, so that the open-circuit fault of a lower tube of a sub-module of a modular multilevel converter can be located. The method is applicable no matter whether the modular multilevel converter is in a rectification or inversion operation state.

Description

technical field [0001] The invention discloses a method for locating an open-circuit fault of a lower tube of a sub-module of a modularized multilevel converter, relates to the technology of a multilevel power electronic converter, and belongs to the technical field of calculation, calculation and counting. Background technique [0002] Compared with the traditional two-level and three-level converters, the Modular Multilevel Converter (MMC) has the characteristics of high efficiency, small output AC voltage harmonics, high sine degree, and high modularity. It is suitable for high-voltage and high-power applications, and has broad prospects in flexible direct current transmission, motor drive and other fields. [0003] Reliable operation is one of the keys to the research of MMC technology. The fault sources of MMC mainly include: power semiconductor device faults, capacitor faults, wiring and terminal faults, and other faults. MMC usually contains a large number of sub-mod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483
Inventor 邓富金殷诚伟刘诚恺王青松陈舒
Owner SOUTHEAST UNIV