模块化多电平换流器排序频率优化设计

doi:10.3969/j.issn.1000－7229.2017.11.004

摘要/Abstract

摘要： 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。

关键词: , 模块化多电平换流器(MMC), 最近电平逼近调制, 电容电压均衡, 排序算法, 开关频率

Abstract: ABSTRACT： Modular multilevel converter (MMC) has been widely used due to its typical advantages, and the sort algorithm of voltage capacitor balancing in MMC sub-modules has been a hot issue nowadays. The optimization of most voltage balancing algorithm is mainly aimed to reduce the time and computing complexity and its switching frequency at present. This paper analyzes the renewal process and wave principle of the capacitor voltage in MMC sub-modules, and deduces the calculation method of the minimum ranking frequency of voltage balancing algorithm. The influence of the ranking frequency on the voltage balancing effect is studied by simulation, and the ranking frequency is optimized according to the simulation results. Finally, taking Xiamen Project as an example, this paper constructs the model in PSCAD/EMTDC for simulation, to verify the correctness of the proposed optimized design scheme. The simulation results show that the proposed ranking algorithm optimization algorithm has good voltage balancing effect, which can reduce half of the switching frequency of the device compared with the traditional time sorting method and can reduce the computational complexity of the overall average time at the same time.

Key words: KEYWORDS： modular multilevel converter (MMC), nearest level modulation, voltage capacitor balancing, ranking algorithm, switching frequency

中图分类号:

TM 77

高冠伦，李庚银. 模块化多电平换流器排序频率优化设计[J]. 电力建设, 2017, 38(11): 26-.

GAO Guanlun, LI Gengyin. Optimal Design of Ranking Frequency for Modular Multilevel Converter[J]. Electric Power Construction, 2017, 38(11): 26-.

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