Abstract A dynamic analysis method of supraharmonics based on sliding-window TLS-ESPRIT(SWTLS-ESPRIT)is proposed. Firstly,a certain length of supraharmonics voltage and current signals was cut into many equal-length consecutive data blocks by rectangle window. For each data block,the number of supraharmonics is estimated.Secondly,the frequency and attenuation factor of the supraharmonics are estimated by the basic TLS-ESPRIT algorithm.Then the amplitude and phase of the supraharmonics are calculated using least square algorithm.Finally,the supraharmonics spectrum is displayed in three dimensions to realize the dynamic analysis of supraharmonics.The simulation analysis and the verification results of two kinds of nonlinear loads show that the proposed method is a more accurate measurement method for further study of supraharmonics,which can not only accurately estimate the supraharmonics frequency,attenuation factor,amplitude and phase with higher frequency resolution,but also can showthe time-varying characteristicof the supraharmonics bythe three-dimensional image.
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