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MMC submodule capacitor voltage balancing control method based on quick sorting

A technology of sub-module voltage and capacitor voltage, applied in the field of power transmission, can solve the problems of high sorting switching frequency, large sorting calculation time, and large calculation amount, so as to reduce the calculation time, reduce the number of calculations, and reduce the switching frequency of the system.

Inactive Publication Date: 2016-10-12
国家电网公司西南分部 +1
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Problems solved by technology

[0010] Aiming at the problems of high switching frequency and large amount of calculation in traditional sub-module sorting, these studies have proposed different improvement strategies and made useful explorations on the problem of sub-module voltage equalization and sorting. However, the current sub-module capacitor voltage needs to For a complete sort, the sort calculation time is still large

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  • MMC submodule capacitor voltage balancing control method based on quick sorting
  • MMC submodule capacitor voltage balancing control method based on quick sorting
  • MMC submodule capacitor voltage balancing control method based on quick sorting

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Embodiment Construction

[0031] The following describes in detail the control algorithm of the capacitor voltage balance of the sub-modules of the modularized multilevel converter based on the quick sorting method with reference to the accompanying drawings.

[0032] figure 1 is a topology diagram of a modular multilevel converter (MMC), Figure 2-Figure 4 It is a flow chart of the control method under different situations of the modular multilevel converter sub-module capacitor voltage balance control algorithm based on the quick sort method of the present invention. If the traditional sorting method is used to equalize the capacitors of the bridge arm sub-modules, when the number of bridge arm sub-modules is large, the amount of sorting calculation will be very large, and the calculation speed of the control system will become very slow. Based on the idea of ​​divide and conquer, the present invention conducts multiple rounds of rapid sorting preliminary screening of the capacitor voltages of the s...

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Abstract

The invention discloses an MMC submodule capacitor voltage balancing control method based on quick sorting. The method comprises the steps that a submodule capacitor voltage value in a removal state and a submodule capacitor voltage value in an input state are stored in a definition array A[xn-1] and a definition array B[ym-1] respectively; first-round sorting is only conducted on the A[xn-1] or the B[ym-1] according to the different conditions to obtain corresponding low voltage arrays and high voltage arrays; second-round sorting is only conducted on the A[xn-1] low voltage array or the A[xn-1] high voltage array or the B[ym-1] high voltage array according to the further condition to obtain some segmentation arrays; after second-round sorting, deltaN submodules in the corresponding segmentation array are selected to be input or removed in sorted list according to specific instructions. According to the method, balancing control is conducted on the MMC submodule capacitor voltage by adopting a divide and conquer strategy idea on the basis of a quick sorting algorithm, not all the submodules of a bridge arm are completely sorted, the traditional sorting and calculating time is shortened, and the calculation speed of an MMC bridge arm submodule capacitor voltage balancing algorithm can be more effectively increased.

Description

technical field [0001] The invention relates to flexible direct current transmission, in particular to a method for controlling the balance of capacitor voltage of sub-modules of modularized multilevel converters based on quick sorting, and belongs to the technical field of power transmission. Background technique [0002] Flexible DC transmission technology based on Modular Multilevel Converter (MMC) is widely used in wind power grid connection and grid asynchronous interconnection due to its advantages of no commutation failure and independent adjustment of active and reactive power. And long-distance large-capacity power transmission and other fields. The DC side of a modular multilevel converter is maintained by series connection of many sub-module DC capacitor voltages. The DC voltage control goal of the converter includes not only the stability of the total DC voltage, but also the balance of the DC capacitor voltages of each sub-module. [0003] The traditional MMC s...

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Application Information

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IPC IPC(8): H02M7/483H02J3/36
CPCH02J3/36H02M7/483H02M7/4835Y02E60/60
Inventor 余锐熊小伏蒋航肖超欧阳金鑫陈愚叶琼蔚
Owner 国家电网公司西南分部
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