焦宁;刘天琪;王顺亮;李媛;

• 1:四川大学电气信息学院

摘要(Abstract)：

电压源换流器在高压直流输电及新能源并网中起着至关重要的作用。为研究基于脉冲宽度调制技术(pulsewidth modulation,PWM)三相逆变器受死区影响的谐波特性,首先,基于傅里叶级数分析的方法,推导出谐波的定量计算公式。通过PWM的调制过程详细分析了死区时间对三相逆变器输出相电压波形的影响。在此基础上推导出了附加死区的谐波计算公式,定量分析了死区对谐波幅值的影响,从理论上揭示了死区效应的谐波产生机理。其次,基于所推导的谐波定量计算公式,从谐波含量理论计算的角度,提出一种在调制信号中注入补偿分量的死区效应补偿方法。最后,仿真和实验结果证明该谐波计算方法可以定量分析死区效应的影响,并验证了所提出的补偿算法能够有效补偿死区效应,验证了此定量分析的正确性和补偿方法的有效性。

关键词(KeyWords)： 正弦脉宽调制;PWM逆变器;谐波;死区效应;死区补偿

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助(51707126)~~

作者(Author): 焦宁;刘天琪;王顺亮;李媛;

Email:

DOI: 10.13335/j.1000-3673.pst.2018.3029

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