發(fā)布時間：2019-03-05 10:40

【摘要】：多電平變換器(modular multilevel converter,MMC)傳統(tǒng)子模塊電容均壓策略中,排序算法的運算量隨子模塊數(shù)目呈指數(shù)倍增長。子模塊數(shù)目很多時,硬件設計難度大、成本高。為此,以減小排序運算量為目的,提出了一種基于歸并排序的改進電容均壓策略。同時,依據(jù)理想情況下MMC的電容電壓規(guī)律,優(yōu)化歸并排序,使計算量進一步減小,并分析了非理想條件時電容電壓的變化情況,提出了修正優(yōu)化歸并算法,保證高效的同時,顯著改善了均壓效果。最后,采用DSP控制器TMS320F28335比較排序算法的執(zhí)行時間,結(jié)果表明優(yōu)化后運算量顯著減小。通過PSCAD/EMTDC搭建451電平MMC仿真模型,驗證了優(yōu)化歸并排序均壓策略及其修正算法的有效性。
[Abstract]:In the traditional sub-module capacitance equalization strategy of multilevel converter (modular multilevel converter,MMC), the computational complexity of the sorting algorithm increases exponentially with the number of sub-modules. When the number of sub-modules is large, the hardware design is difficult and the cost is high. For this purpose, an improved capacitor voltage sharing strategy based on merge sorting is proposed in order to reduce the number of sorting operations. At the same time, according to the law of capacitance voltage of MMC under ideal condition, the optimal merging order is optimized to further reduce the calculation, and the variation of capacitance voltage under non-ideal condition is analyzed, and a modified optimal merging algorithm is proposed to ensure the high efficiency at the same time. The pressure equalizing effect was improved significantly. Finally, the DSP controller TMS320F28335 is used to compare the execution time of the sorting algorithm. The results show that the amount of computation after optimization is significantly reduced. The simulation model of 451-level MMC is built by PSCAD/EMTDC to verify the effectiveness of the optimal merge-order voltage-sharing strategy and its modified algorithm.
【作者單位】： 西安西電電力系統(tǒng)有限公司;西安交通大學電氣工程學院;
【基金】：國家重點基礎研究發(fā)展計劃項目(973計劃)(2015CB251001)~~
【分類號】：TM721.1;TM46

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