中国电机工程学报2012，Vol.32Issue(28)：76-82,7.
电力系统真实间谐波存在判据研究
Research on the Criterion of the Existence of Genuine Power System Interharmonics
摘要
Abstract
The interharmonic spectrum of an electrical voltage or current from discrete Fourier transform can not only be caused by genuine interharmonic components, but can also be caused by other system disturbances. Therefore, the existence determination of genuine interharmonics from the spectrum becomes the premise for further calculation of interharmonic parameters. From the theoretical perspective, this paper firstly analyzed and pointed out that the waveform difference among each cycle in the analysis window was the cause of the existence of interharmonic spectrum, and then presented a method to determine the existence of genuine interharmonic components, which was based on interharmonic time-frequency contour chart and the component appearance rate. The presented method firstly performed continuous discrete Fourier transform on the captured signal with certain duration and obtains the corresponding absolute time-frequency matrix, and then the genuine interharmnics could be distinguished based on the component appearance rate of the matrix and the criterion threshold. The method is easy to be implemented with clear principle, and it can distinguish the genuine interharmonics from the measured signal. The analysis on several data groups from real measurements verifies the effectiveness and the practicability of the method.关键词
间谐波分析/离散傅里叶变换/快速傅里叶变换/电能质量分析Key words
interharmonic analysis/discrete Fourier transform (DFT)/fast Fourier transform (FFT)/power quality analysis分类
信息技术与安全科学引用本文复制引用
刘亚梅,惠锦,杨洪耕,林瑞星..电力系统真实间谐波存在判据研究[J].中国电机工程学报,2012,32(28):76-82,7.基金项目
国家自然科学基金项目(51077095). （51077095）
