非理想三相电网的特征信号提取

doi:10.16180/j.cnki.issn1007-7820.2022.04.013

Abstract

Abstract:

When the three-phase grid voltage is distorted or unbalanced, there are many non-ideal characteristic signals in the grid-connected system, such as harmonics and negative sequence components. In view of such problems, this study proposes a harmonic and negative sequence component extraction algorithm based on ISDFT. This algorithm redesigns the transfer function of the SDFT, which retains good signal filtering characteristics while improving the response rate of the system, and has strong flexibility. Experimental results show that ISDFT can quickly and accurately extract characteristic harmonics and negative sequence components, and ISDFT has good dynamic stability when the load changes suddenly. In addition, in terms of the extraction results of the 5th and 7th harmonics, DFT, SDFT, and ISDFT have the same effect of extracting harmonics, but the response rate of ISDFT is 44.56% faster than SDFT and 65.32% faster than DFT.

Key words: non-ideal grid, grid voltage distortion, grid voltage imbalance, improved sliding discrete Fourier transform, harmonic extraction, negative sequence component, positive and negative sequence separation, power quality

CLC Number:

TN710.1

Qingqing YUAN,Min JIANG,Yumei YANG. Characteristic Signal Extraction of Non-Ideal Three-Phase Grid[J].Electronic Science and Technology, 2022, 35(4): 78-86.

Figures/Tables 18

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谐波提取方法	5次谐波提取时间	7次谐波提取时间
DFT	251.41	228.93
SDFT	157.28	143.22
ISDFT	87.19	78.62

谐波提取方法	5次谐波占比	7次谐波占比
DFT	19.96	14.25
SDFT	19.96	14.25
ISDFT	19.97	14.27

Characteristic Signal Extraction of Non-Ideal Three-Phase Grid

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