基于修正优化归并排序的MMC电容均压策略
发布时间：2019-03-05 10:40
【摘要】：多电平变换器(modular multilevel converter,MMC)传统子模块电容均压策略中,排序算法的运算量随子模块数目呈指数倍增长。子模块数目很多时,硬件设计难度大、成本高。为此,以减小排序运算量为目的,提出了一种基于归并排序的改进电容均压策略。同时,依据理想情况下MMC的电容电压规律,优化归并排序,使计算量进一步减小,并分析了非理想条件时电容电压的变化情况,提出了修正优化归并算法,保证高效的同时,显著改善了均压效果。最后,采用DSP控制器TMS320F28335比较排序算法的执行时间,结果表明优化后运算量显著减小。通过PSCAD/EMTDC搭建451电平MMC仿真模型,验证了优化归并排序均压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.
【作者单位】： 西安西电电力系统有限公司;西安交通大学电气工程学院;
【基金】：国家重点基础研究发展计划项目(973计划)(2015CB251001)~~
【分类号】：TM721.1;TM46
本文编号：2434821
[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.
【作者单位】： 西安西电电力系统有限公司;西安交通大学电气工程学院;
【基金】：国家重点基础研究发展计划项目(973计划)(2015CB251001)~~
【分类号】：TM721.1;TM46
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