基于预设载波的随机开关频率调制方法

王亭岭; 熊军华; 张瑾

基于预设载波的随机开关频率调制方法

1.
华北水利水电学院电力学院, 郑州 450011
2. 北京航空航天大学机械工程及自动化学院, 北京 100191
3. 中国科学院电工研究所, 北京 100190

详细信息

作者简介:
王亭岭(1975-),男,内蒙古呼盟人,副教授,wangtl@ncwu.edu.cn.

中图分类号: TM464
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- 文章访问数: 1970
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- 被引次数: 0
出版历程
- 收稿日期: 2012-02-23
- 网络出版日期: 2013-03-31

Random PWM method based on pre-determined carrier frequencies

1.
College of Electrical Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
2. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
3. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China

摘要

摘要: 现有的随机开关频率调制方法未考虑载波切换频率与载波频率间的关系,因此会使逆变器输出交流电产生一定的谐波畸变.为了克服这一不足,通过分析载波切换频率对随机载波信号的影响,得出预置载波随机切换时,前后两条载波的相位不匹配是造成逆变器输出电压产生畸变的根本原因,并提出采用随机切换预设载波的方法实现开关频率的随机化.仿真及实验结果表明,随机脉冲宽度调制(PWM,Pulse Width Modulation)方法不但可以有效抑制输出电压的高次谐波而且在波形正弦度方面优于常规随机PWM方法.
- 逆变器 /
- 随机调制 /
- 音频噪声 /
- 谐波抑制
Abstract: For reported random frequency pulse width modulation(PWM) methods, harmonic distortion appears in the output waveform because the relationship between the carrier frequencies and their changing frequency is not carefully considered. To cope with the above obstacle, the effect of carrier changing frequency on the randomized carrier signals was investigated. A fact that phase mismatch of the two changing carrier signals induces the output voltage distortion was subsequently obtained. Then, a proposed approach was to select the switching frequency randomly among a few pre-determined carrier frequencies. Both simulation and experimental results verify that using the proposed PWM technique, the dominant harmonic clusters are effectively reduced while retaining good sinusoidal output waveforms, which are superior to that based on the conventional random PWM methods.
- inverter /
- random modulation /
- acoustic noise /
- harmonic suppression

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参考文献(1)

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