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Capacitor Voltage Equalization Method for Modular Multilevel Converter Based on Optimal Merge Sort

A modular multi-level, capacitive voltage equalization technology, applied in the direction of power transmission AC network, output power conversion device, AC power input conversion to DC power output, etc., can solve the problem that the sorting algorithm does not combine MMC control characteristics and control technology and hardware design difficulties, increase the difficulty of actual project implementation, etc., to achieve the effect of reducing actual execution time, high sorting efficiency, and reduced time complexity

Active Publication Date: 2017-12-26
CHINA XD ELECTRIC CO LTD +1
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Problems solved by technology

However, when the number of sub-modules is hundreds or thousands, the amount of sorting calculations in traditional methods increases exponentially, which brings difficulties to control technology and hardware design, increases the difficulty of actual engineering implementation, and increases engineering costs.
In addition, the existing sorting algorithm does not combine the control characteristics of MMC, but only applies mathematically different sorting algorithms to voltage equalization control

Method used

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  • Capacitor Voltage Equalization Method for Modular Multilevel Converter Based on Optimal Merge Sort
  • Capacitor Voltage Equalization Method for Modular Multilevel Converter Based on Optimal Merge Sort
  • Capacitor Voltage Equalization Method for Modular Multilevel Converter Based on Optimal Merge Sort

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[0024] The present disclosure will be further described below with reference to the accompanying drawings. In particular, it is stated that the following description is essentially for the purpose of macroscopic explanation and example illustration, and in no way imposes any limitation on the present disclosure and its application or use. Relative arrangements of components and steps and numerical expressions and numerical values ​​set forth in the embodiments do not limit the scope of the present disclosure unless otherwise specifically stated. Additionally, techniques, methods and devices known to those skilled in the art may not be discussed in detail but are intended to be part of the description where appropriate.

[0025] A capacitor voltage equalization method for modular multilevel converters based on optimized merge sorting, including the following steps:

[0026] First divide n elements into subsequences each containing n / 2 elements, then recursively sort the two su...

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Abstract

The invention provides an optimized merging and sorting based modular multilevel converter capacitor voltage equalizing method, which is characterized in that a merging and sorting algorithm is optimized through analyzing a capacitor voltage law of nearest level modulation in an ideal condition by using a modular multilevel converter modulation technology, the time complexity of optimized merging and sorting is further reduced, the execution time of actual sorting is reduced to the minimum, the sorting efficiency is very high, and sorting is not restricted by the number of sub-modules. In addition, a non-ideal condition correction optimized merging and sorting algorithm is provided by combining a direct insertion sorting method, the sorting accuracy can be ensured by correcting the optimized algorithm, the voltage equalizing effect is good, and the extra time overhead is small.

Description

technical field [0001] The invention relates to the technical field of electric power systems, in particular to a method for equalizing capacitor voltage of modularized multilevel converters based on optimized merge sorting. Background technique [0002] The high-voltage direct current transmission system (VSC-HVDC) based on the voltage source converter can independently control active and reactive power, and can work in a passive inverter state, so it has broad development prospects. However, in high-voltage and high-power applications, the problem of withstand voltage of switching devices caused by traditional two-level and three-level VSCs is difficult to solve. Such as figure 1 The new modular multilevel converter topology (modular multilevel converter, MMC) shown can effectively increase the number of levels, reduce harmonic content, reduce switching frequency, and has the advantages of convenient modular design and cascaded higher voltage levels, etc. Advantages, wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219
CPCH02J3/36H02M7/219
Inventor 苟锐锋涂小刚田鸿昌赵方舟肖国春
Owner CHINA XD ELECTRIC CO LTD
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