Supraharmonics Measurement Based on Colored Noise Suppressed Matrix Pencil Method

Abstract

Supraharmonics emitted from power electronic devices can cause electromagnetic interference. However, there is currently no unified standard for measuring supraharmonics. This paper presents a supraharmonics measurement method with high-time resolution based on the matrix pencil method. A technique based on the principle of cross-correlation is used to process the measured signal. The original signal is replaced by the processing results, then it is solved by the matrix pencil method. This method can effectively reduce the influence of colored noise to the measurement. After comparing with the results obtained by compressive sensing measurement method, it is proved that the method proposed in this paper has distinct advantages in reducing the interference of colored noise and can effectively improve the accuracy of the measurement of supraharmonics.

Power Grids and Instrument Transformers up to 150 kHz: A Review of Literature and Standards

“…More specifically, the international standards IEC 61000-4-7 [10], IEC 61000-4-30 [13], and CISPR 16-1 [18] provide methods for measuring HFDs. The proposed method for measuring frequency components above 9 kHz involves aggregating the energy of the signal under analysis into predetermined frequency ranges.…”

“…In the literature, several papers are focused on the topic of HFD. These research studies are focused on measuring the level of emissions generated by different sources [9,10] and their effects on LV and MV power system components [11], evaluation methods of HFD levels [12,13], propagation through power network impedance [14,15], and mitigation strategies [16][17][18][19].…”

Supraharmonic Detection Algorithm Based on Interpolation of Self-Convolutional Window All-Phase Compressive Sampling Matching Pursuit

“…The number of leakage lines reflects the sparsity of the supraharmonic signal, and the amplitude of the leakage lines will be attenuated according to (17). In signal processing, when N > 100, the decay tends to 0 rapidly, and the total number of sampling points of the supraharmonic signal is N >> 100.…”

“…But in the simulation, only the detection effect of the algorithm under the condition of fundamental frequency fluctuation is tested. In [17], the colored noise suppressed matrix pencil method is proposed, which effectively improves the accuracy of supraharmonic measurement by effectively reducing the influence of color noise on the measurement. However, this method only focuses on resisting noise interference to reduce the error of signal measurement and does not consider the optimization of phase measurement accuracy.…”

“…In the final stage, the focus shifts to analyzing four spectrum lines adjacent to the peak, enabling the estimation of harmonic amplitude and frequency. In the simulation part, this paper analyzes the measurement accuracy of the supraharmonics parameters of the proposed algorithm under normal conditions and measures the accuracy of amplitude, frequency, and phase, which makes up for the lack of phase measurement in [17]. At the same time, the supraharmonics accuracy under different compression ratios, levels of noise interference, and fundamental frequency fluctuations of the power system is also tested, which improves the problem of fewer measurement scenarios in [16,18].…”