模块化多电平换流器排序频率优化设计

发布时间：2018-05-13 12:28

本文选题：模块化多电平换流器(MMC) + 最近电平逼近调制　；参考：《电力建设》2017年11期

【摘要】：模块化多电平换流器(modular multilevel converter,MMC)因其独特的优势取得了广泛的应用,其中子模块电容电压均衡排序算法成为了热点话题。目前国内外大多数均压算法优化的目的都是为了降低时间计算复杂度和器件的开关频率。通过分析MMC子模块电容电压更新过程和波动原理,推导均压算法的最小排序频率计算方法,通过仿真研究均压算法排序频率对均压效果的影响,根据仿真结果对排序频率进行了优化设计。最后,将厦门柔性直流输电工程作为算例,在PSCAD/EMTDC中搭建模型进行仿真,验证优化设计方案的正确性。由仿真结果可知,论文提出的排序频率优化算法具有较好的均压效果,相比传统的时刻排序方法可以降低器件一半的开关频率,且能同时降低整体平均时间计算复杂度。
[Abstract]:Modular multilevel converter (Modular multilevel convertor MMC) has been widely used because of its unique advantages, among which the submodule capacitor voltage equalization scheduling algorithm has become a hot topic. At present, the purpose of most of the equalization algorithms is to reduce the time complexity and the switching frequency of the devices. Based on the analysis of capacitive voltage updating process and fluctuation principle of MMC submodule, the calculation method of minimum sorting frequency of voltage equalization algorithm is deduced, and the effect of sequencing frequency of voltage equalization algorithm on voltage equalization effect is studied by simulation. According to the simulation results, the sorting frequency is optimized. Finally, the flexible direct current transmission project in Xiamen is taken as an example, and the model is built in PSCAD/EMTDC to verify the correctness of the optimized design scheme. The simulation results show that the proposed scheduling frequency optimization algorithm has a better voltage sharing effect. Compared with the traditional time sorting method, it can reduce the switching frequency of the device by half and reduce the computational complexity of the overall average time at the same time.
【作者单位】：国网浙江省电力公司杭州供电公司;新能源电力系统国家重点实验室(华北电力大学);
【分类号】：TM46

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