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The extensive use of power electronic devices has led to supraharmonic issues.The concept of harmonic groups has been widely used to minimize energy leakage. Moreover, the distribution of supraharmonics is related to the switching frequency of harmonic sources. Given the diversity of switching frequencies and emissions distribution, harmonic groups need to be flexibly adjusted. A switching frequency identification method based on correlation analysis is proposed in this work. In addition, the switching frequencies of supraharmonic sources are identified through a correlation analysis of the supraharmonic emissions of a measurement point. Furthermore, a flexible supraharmonic group method in which bandwidth can be adjusted according to switching frequency is proposed. This method can avoid inconsistency between the emissions and group centers and minimizes energy leakage successfully. Finally, the method is validated via simulation and test data.