基于HHT的双闭环控制逆变器谐波分析

Harmonic Analysis for Dual-Loop Controlled Inverter Based on HHT

为了提高逆变器的输出电压谐波分析效果,提出了基于希尔伯特-黄变换(HHT)方法的逆变器输出电压谐波分析方法。该方法包括经验模态分解法(EMD)和Hilbert变换(HT)。在分析双闭环控制逆变器的基础上,对逆变器的输出电压进行EMD分解得到本征模态函数(IMF),对其进行Hilbert变换,得到输出电压的频率和幅值分布,并分析谐波分量的参数。设计了基于LabVIEW平台的逆变器谐波检测和分析装置,对谐波分量实时检测和分析。实验结果表明,该方法精确地计算电压的参数,提取和分析了谐波分量,为下一步的谐波抑制方法研究提供了有力的支持。

To improve the effect of harmonic analysis for inverter＇s output voltage, this paper presents a method for harmonic analysis based on Hilbert-Huang transform （HHT）. The method includes empirical mode decomposition （EMD） and Hilbert transform （HT）. Based on analyzing the double closed loop control inverter, the output voltage is decomposed into intrinsic mode functions （IMF） by EMD method. It is then transformed with HT to obtain the output voltage frequency and amplitude distribution, and to analyze harmonic parameters. Using LahVIEW, a device is designed to detect and analyze the harmonic of the inverter in real time. Experimental results indicate that the method can obtain parameters of output voltage and harmonic components accurately, and offers strong support for harmonic suppression research in the future.