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A Fast sorting Strategy Based on a two-way merge sort for Balancing the Capacitor Voltages in Modular Multilevel Converters

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JOURNAL OF POWER ELECTRONICS 2017年第2期17卷 346-357页

作者： Zhao, Fangzhou Xiao, Guochun Liu, Min Yang, Daoshu Xi An Jiao Tong Univ Sch Elect Engn State Key Lab Elect Insulat & Power Equipment Xian Shaanxi Peoples R China

The Modular Multilevel Converter (MMC) is particularly attractive for medium and high power applications such as High-Voltage Direct Current (HVDC) systems. In order to reach a high voltage, the number of cascaded submodules (SMs) is generally very large. Thus, in the applications with hundreds or even thousands of SMs such as MMC-HVDCs, the sorting algorithm of the conventional voltage balancing strategy is extremely slow. This complicates the controller design and increases the hardware cost tremendously. This paper presents a two-way merge sort (TWMS) strategy based on the prediction of the capacitor voltages under ideal conditions. It also proposes an innovative Insertion sort Correction for the TWMS (ISC-TWMS) to solve issues in practical engineering under non-ideal conditions. The proposed sorting methods are combined with the features of the MMC-HVDC control strategy, which significantly accelerates the sorting process and reduces the implementation efforts. In comparison with the commonly used quicksort algorithm, it saves at least two-thirds of the sorting execution time in one arm with 100 SMs, and saves more with a higher number of SMs. A 501-level MMC-HVDC simulation model in PSCAD/EMTDC has been built to verify the validity of the proposed strategies. The fast speed and high efficiency of the algorithms are demonstrated by experiments with a DSP controller (TMS320F28335).

关键词： Capacitor voltages balancing Fast sorting algorithms Modular multilevel converter two-way merge sort

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Insertion sort Correction of two-way merge sort Algorithm for Balancing Capacitor Voltages in MMC with Reduced Computational Load 8

Insertion Sort Correction of Two-Way Merge Sort Algorithm fo...

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8th IEEE International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia)

作者： Zhao, Fangzhou Xiao, Guochun Song, Zhishun Peng, Cheng Xi An Jiao Tong Univ Sch Elect Engn Xian Shanxi Peoples R China Xian XD Power Syst Co Ltd Xian Shanxi Peoples R China

ISBN: (纸本)9781509012107

The Modular Multilevel Converter (MMC) is very suitable for high-power applications like High-Voltage Direct Current (HVDC) transmission system, in which the number of submodules is commonly very large to reach high voltage. Therefore, the sorting algorithm of the conventional voltage balancing strategy causes too much computational load, greatly increasing the hardware cost and challenging the controller design. This paper introduces a two-way merge sort that evidently reduces computation weight and accelerates the sorting, combining with the prediction of capacitor voltages in ideal conditions. Furthermore, to solve the issue of non-ideal conditions in practical applications, this paper proposes an insertion sort correction algorithm with little and controllable computational load on the basis of the two-way merge sort. The proposed sorting algorithm takes advantage of the features of MMC control strategy, and consequently is much faster than conventional sorting such as quicksort. 401-level MMC simulation results in PSCAD/EMTDC show the validity of the proposed sorting algorithms, and the reduced computational load with shorter execution time is verified by DSP controller TMS320F28335.

关键词： Modular multilevel converter capacitor voltage balancing sorting algorithm two-way merge sort insertion sort

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