具有较低复杂度和开关频率的MMC混合排序均压算法

发布时间：2018-04-16 06:42

本文选题：模块化多电平换流器 + 最近电平逼近调制　；参考：《电力系统自动化》2017年15期

【摘要】：模块化多电平换流器(MMC)在世界范围内的直流输电中应用已经十分广泛,其中电容电压均衡控制策略是MMC应用的关键技术与难点。文中首先提出了一种分两组的组间比较排序法,称为OF排序法。该方法排序的最大时间复杂度为N-1,但该方法的使用范围受限。因此,在此基础上又提出了一种新型MMC混合排序均压算法。该算法在大幅降低排序时间复杂度的同时还能够降低器件的开关频率。以厦门柔性直流输电工程为例,验证了该算法在多种工况下的正确性。最后,通过仿真计算出新型混合排序均压算法的时间复杂度约为1.45 N,优于现有的其他MMC均压排序算法,并且仿真结果显示该算法还能降低开关频率,约为传统冒泡法的1/2。
[Abstract]:Modularized multilevel converter (MMC) has been widely used in HVDC transmission worldwide, and the capacitive voltage equalization control strategy is the key technology and difficulty in the application of MMC.In this paper, a two-group comparison sorting method is proposed, which is called the of sorting method.The maximum time complexity of this method is N-1, but the scope of use of this method is limited.Therefore, a new MMC hybrid sorting equalization algorithm is proposed.The algorithm can greatly reduce the complexity of sorting time and reduce the switching frequency of the device.Taking Xiamen flexible direct current transmission project as an example, the correctness of the algorithm under various working conditions is verified.Finally, the time complexity of the new hybrid equalizing algorithm is about 1.45N, which is better than other MMC equalizing sorting algorithms. The simulation results show that the algorithm can also reduce the switching frequency, which is about 1 / 2 of that of the traditional bubbling method.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);直流输电技术国家重点实验室(南方电网科学研究院有限责任公司);
【基金】：中央高校基本科研业务费专项资金资助项目(2016MS07) 国家重点研发计划资助项目(2016YFB0900903) 国家自然科学基金资助项目(51607065)~~
【分类号】：TM46;TM721.1

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