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混沌PWM逆变器输出电压功率谱密度分析

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Indexed by:期刊论文

Date of Publication:2006-07-15

Journal:中国电机工程学报

Included Journals:Scopus、EI、PKU、ISTIC、CSCD

Volume:26

Issue:20

Page Number:79-83

ISSN No.:0258-8013

Key Words:逆变器;脉宽调制;混沌;功率谱密度

Abstract:逆变器采用混沌PWM(pulse width modulation)调制能够有效抑制开关频率及其倍频附近的高次谐波幅值,从而大大减少逆变器驱动电机的电磁干扰.该文对混沌PWM逆变器输出电压的功率谱密度进行了分析,经过合理简化得到了混沌信号概率密度函数与逆变器输出电压功率谱密度之间的关系.根据功率谱密度的表达式,对比分析了概率分布不同的两种混沌序列(Logistic 和 Chua's )对逆变器输出电压功率谱密度的影响.实验结果表明,采用混沌PWM调制可以有效抑制逆变器输出电压的高次谐波幅值,并且概率分布不同的2种混沌信号对PWM逆变器输出频谱的影响差别不大.

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