State prediction method and state prediction device for submodules of modular multilevel converter

A modular multi-level, multi-level converter technology, applied in the direction of circuit devices, output power conversion devices, power transmission AC networks, etc., can solve problems such as different failure rates of sub-modules and changes in capacitance values. To achieve the effect of improving pertinence and reliability

Inactive Publication Date: 2018-07-24
JIANGSU ELECTRIC POWER CO +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The failure of redundant sub-modules will not affect the operation of the entire system, but individual sub-modules are different, and the current and voltage borne by the main components of the IGBT and capacitors in each sub-module will be different, resulting in a failure probability of the sub-module will be different, and the capacitance of the capacitor will also change with time and allowable working conditions

Method used

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  • State prediction method and state prediction device for submodules of modular multilevel converter
  • State prediction method and state prediction device for submodules of modular multilevel converter
  • State prediction method and state prediction device for submodules of modular multilevel converter

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Embodiment 1

[0022] Embodiment one: as attached figure 1 As shown, the modular multilevel converter includes multiple sub-modules. Aiming at the prediction of the possibility of failure of the multiple sub-modules in the modular multilevel converter, a modular multilevel converter is adopted The sub-module state prediction method is: predict the fault state according to the switching times of each sub-module within a period of time (for example, 1min), and the failure possibility of the sub-module increases with the increase of the switching times.

[0023] In this process, it is first necessary to record the trigger command of each sub-module, the trigger command is the trigger command of the IGBT device in the sub-module, and then record the switching times of each sub-module according to the recorded trigger command.

[0024] After recording the switching times of each sub-module, the sub-modules are sorted according to the switching times from high to low, so as to obtain the order of ...

Embodiment 2

[0026] Embodiment two: as attached figure 2 As shown, the difference between the sub-module state prediction method of the modular multilevel converter in this embodiment and the first embodiment is that: after recording the switching times of each sub-module, the average value of the switching times of each sub-module is calculated, That is, the average number of switching times, the sub-modules are sorted from high to low according to the difference between the number of switching times and the average number of switching times, so as to obtain the order of the failure possibility of each sub-module.

[0027] The first standard deviation can be preset, and the difference between the number of switching times and the average number of switching times in the ranking of sub-module failure possibilities exceeds m 1 times the first standard deviation for sub-modules, m 1 Any value in the range [2, 4], such as m 1 =3. The sub-module with a larger deviation between the number o...

Embodiment 3

[0028] Embodiment three: as attached image 3 As shown, the difference between the sub-module state prediction method of the modular multilevel converter of this embodiment and the first embodiment is that: the standard value of switching times is preset, and after recording the switching times of each sub-module, each sub-module The modules are sorted from high to low according to the difference between their switching times and the standard value of switching times, so as to obtain the ranking of the fault possibility of each sub-module.

[0029] The second standard deviation can also be preset, and the difference between the number of switching times and the standard value of the number of switching times in the fault possibility ranking of sub-modules exceeds m 2 times the second standard deviation for sub-modules, m 2 Any value in the range [2, 4], such as m 2 =3. The sub-module with a larger deviation between the number of switching times and the second standard devia...

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Abstract

The invention relates to a state prediction method for submodules of a modular multilevel converter. The method comprises the following steps: carrying out failure state prediction on switching timesof all the submodules within a period of time, wherein the failure possibility of the submodules is improved along with the increase of the switching times of the submodules; recording the switching times of all the submodules, then sorting all the submodules from high to low according to the switching times of the submodules, or calculating the average switching time of all the submodules; sorting all the submodules from high to low according to a difference between the switching times and the average switching time of all the submodules, or recording the switching times of all the submodulesand then sorting all the submodules according to a difference between the switching times of all the submodules and a preset switching time standard value, so as to obtain failure possibility sortingof all the submodules. According to the state prediction method disclosed by the invention, the submodules with abnormal parameters and the submodules with higher failure possibility can be effectively picked out and further provide auxiliary information for operation and maintenance of a flexible direct current system, so that the pertinence of maintenance work of the flexible direct current system is improved.

Description

technical field [0001] The invention relates to a method and device for state prediction of sub-modules in a modular multilevel (MMC) converter. Background technique [0002] Flexible DC transmission uses voltage source converters, which can independently adjust the transmission of active and reactive power, improve the transmission capacity of the AC system, and easily form a multi-terminal DC transmission system. And other application fields, have obvious competitiveness. [0003] At present, the flexible DC technology using modular multilevel (MMC) converter technology has been widely used. The characteristic of MMC converter is to use several sub-modules with the same or similar topology in series to form a single bridge arm, so as to realize voltage and Capacity expansion. The failure of redundant sub-modules will not affect the operation of the entire system, but individual sub-modules are different, and the current and voltage borne by the main components of the IGB...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02M1/00
CPCH02J3/36H02M1/00H02J2203/20H02M1/0003Y02E60/60
Inventor 黄清付慧田强邱德锋刘利国朱卫平连建阳随顺科杨晨李冬
Owner JIANGSU ELECTRIC POWER CO
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