45 坐标系下级联逆变器简化空间矢量调制及性能优化研究

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摘要研究了H桥级联型逆变器在45°坐标系下简化空间矢量调制, 其扇区定位与矢量作用时间计算非常简单, 并且易于向每相任意个数H桥级联型逆变器扩展。重点研究了45°坐标系中, 通过对简化空间矢量调制方法的改进来实现逆变器输出性能的优化。调制方法的改进具体如下:①为了减少逆变器功率器件的开关损耗, 研究了开关频率优化算法, 在满足逆变器同样输出要求的同时可以有效减少开关次数;②为了减少逆变器产生的共模电压, 研究了抑制零序电压输出的调制算法, 其可以有效减少逆变器输出电压中的共模电压, 使共模电压在极小的电压范围内波动。最后, 仿真与实验结果验证了本文所提方法的正确性。

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	朱思国
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	晏建玲
	阎德建

关键词 ： 45°, 坐标系, 空间矢量调制, 开关频率优化, 共模电压

Abstract：A simplified space vector modulation is researched in 45°coordinate system for H bridge cascaded inverter in this paper.The modulation method is simple for sector location and time calculation and is easy to be expanded to cascaded inverter with arbitrary number H bridge in each phase.The key research of the paper is to achieve inverter output performance optimization by the improvement of the simplified modulation method in 45°coordinate system.Specific improvement of the modulation method as follows:①In order to reduce the switching losses, switching frequency optimization algorithm is researched.It can effectively reduce the number of switch in the same output requirement。②In order to reduce the common-mode voltage, the modulation algorithm of inhibition zero-sequence voltage output is researched. It can effectively reduce the common mode voltage in output voltage for cascaded inverter and make the common-mode voltage fluctuate in small voltage range.Finally, simulation and experimental results verify the correctness of the proposed method.

Key words： 45° coordinate system space vector modulation switching frequency optimization common-mode voltage

收稿日期: 2011-03-17 出版日期: 2014-03-19

PACS:

TM921

基金资助:湖南省科学技术厅科技计划资助项目(06CK3005)。

作者简介: 朱思国男, 1979年生, 博士研究生, 研究方向为电力电子技术与高压变频调速。欧阳红林男, 1965年生, 博士, 教授, 博士生导师, 研究方向为电力电子技术与高、低压变频调速, 多相电机拖动等

引用本文:

朱思国, 欧阳红林, 晏建玲, 阎德建. 45 坐标系下级联逆变器简化空间矢量调制及性能优化研究[J]. 电工技术学报, 2012, 27(2): 68-76. Zhu Siguo, Ouyang Honglin, Yan Jianling, Yan Dejian. Research on Simplified Space Vector Modulation and Performance Optimization for Cascaded Inverter in 45°Coordinate System. Transactions of China Electrotechnical Society, 2012, 27(2): 68-76.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2012/V27/I2/68

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