考虑最佳开关序列的三电平变换器非正交坐标系空间矢量调制简化算法

doi:10.19595/j.cnki.1000-6753.tces.L80101

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摘要在三电平变换器的控制过程中,相较于传统正交坐标系下的空间矢量调制算法,60°非正交坐标系算法能够大大简化计算过程,因此得到了广泛应用。但是在最佳开关序列的实现过程中,如果仍采用和正交坐标系算法一样的查表方法,则无法充分发挥该算法在简单性和直观性方面的优势。从60°非正交坐标系矢量空间的独特对称性出发,在传统最佳开关序列实现方法的基础上,提出一种仅需两步排序即可完成的简化方法,既便捷地实现了最佳开关序列,又充分发挥了非正交坐标系简化计算的优势。通过仿真和实验对所提算法的有效性进行了验证,结果表明,该简化算法能够实现与正交坐标系算法一致的输出波形质量和谐波性能。

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关键词 ：三电平变换器, 空间矢量调制, 非正交坐标系, 最佳开关序列

Abstract：In three-level converter applications, the nonorthogonal frame space vector modulation method is widely used, because it is simpler than conventional orthogonal frame method. However, the implementation of optimal switching sequences based on look up table does not take advantage of the simplicity and intuitiveness of this method. Based on the unique symmetric property of nonorthogonal vector space, a new simple implementation process is proposed in this paper. This new method consists of only two steps of adjustment, and assures both the optimal switching sequences and the simplicity of nonorthogonal algorithm. The new method is verified by simulation and experiment in comparison with conventional orthogonal algorithm, and the results confirm that the same output waveform and harmonic performance are maintained.

Key words： Three level converters space vector modulation (SVM) nonorthogonal coordinate system optimal switching sequences

收稿日期: 2018-06-27 出版日期: 2019-07-29

PACS:

TM921.3

基金资助:国家自然科学基金资助项目（51807180）

通讯作者: 王金凤女,1977年生,博士,副教授,研究方向为电力系统规划和运行。E-mail:wjf722@163.com

作者简介: 李伟伟,男,1982年生,博士研究生,研究方向为多电平变换器调制与控制。E-mail:wolf_wei2003@163.com

引用本文:

李伟伟, 张学广, 万梓燊, 赵旖旎, 徐殿国. 考虑最佳开关序列的三电平变换器非正交坐标系空间矢量调制简化算法[J]. 电工技术学报, 2019, 34(zk1): 181-188. Li Weiwei, Zhang Xueguang, Wan Zishen, Zhao Yini, Xu Dianguo. Simplified Implementation of Optimal Switching Sequences for Nonorthogonal Space Vector Modulation of Three Level Converter. Transactions of China Electrotechnical Society, 2019, 34(zk1): 181-188.

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