| 一种用于PWM整流器NPB控制的混合式SVPWM方法 |
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| 引用本文： | 何爱华,王英健,范必双.一种用于PWM整流器NPB控制的混合式SVPWM方法[J].自动化技术与应用,2014(4):58-64. |
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| 作者姓名： | 何爱华 王英健 范必双 |
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| 作者单位： | 长沙理工大学电气与信息工程学院,湖南长沙410076 |
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| 摘 要： | 研究了三电平PWM整流器优化设计问题,由于直流侧中点电压不平衡,引起输出波形质量不好,系统不稳定.为了解决中点平衡问题,分析了造成中点电压不平衡的原因以及小矢量对中点电压的影响.针对小矢量引起中点电压不平衡,提出了一种基于9段式与7段式混合调制的矢量调制方法.最后采用MATLAB软件搭建模型,对中点平衡算法进行仿真,实验结果验证了该算法对中点电压平衡控制的有效性.
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| 关 键 词： | 三电平整流器 中点电压平衡 9段式矢量调制 时间分配因子 |
A Hybrid SVPWM Method for NPB Control of PWM Rectifier |
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| HE Ai-hua,WANG Ying-jian,FAN Bi-shuang.A Hybrid SVPWM Method for NPB Control of PWM Rectifier[J].Techniques of Automation and Applications,2014(4):58-64. |
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| Authors: | HE Ai-hua WANG Ying-jian FAN Bi-shuang |
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| Affiliation: | 1.School of Electrical and Information Engineering, Changsha University of Science ＆Technology, Changsha 410076 China;) |
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| Abstract: | The optimization design problem of the three-level PWM rectifier is researched in this paper.Due to the unbalance of neutral-point voltage of DC bus,the quality of output waveform is bad and the system is not stable.In order to solve the problem of balance for neutral-point,the causes of unbalanced neutral-point voltage and the influence of the small vector on neutral-point voltage are analyzed.In view of the neutral-point voltage unbalance caused by small vectors,a method of vector modulation based on hybrid modulation of nine-stage and seven-stage is proposed.Finally,the neutral-point balancing algorithm is simulated by MATLAB models,the experimental results verify the effectiveness of the algorithm to the neutral-point voltage balance control. |
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| Keywords: | three-level rectifier neutral-point voltage balance nine-stage vector modulation time distribution factor |
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