Dielectric Loss Measurement Method based on the Energy Moment and Quasi-Periodic Interpolation

Abstract:

Harmonic analysis method for measurement of dielectric loss, due to the impact of fluctuations in grid frequency and higher harmonics, it is difficult to do the synchronous sampling, which reduces the accuracy of the measurements (especially the phase).In order to improve measurement accuracy, this paper presents a new method of calculation based on the energy moment of quasi-periodic interpolation algorithm. First, using a high frequency to sample the original signal, and then using the energy moment balance theory accurately measure the fundamental frequency, further calculating the integral period sampling rate and integral period samples, and last making integral period re-sampling and FFT calculation after interpolation. The simulation results show that this algorithm is high accuracy, good stability, less affected by the frequency fluctuation, harmonic proportion and initial phase.

• Periodical: Advanced Materials Research (Volumes 718-720)
• Pages: 650-656
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.718-720.650
• Online since: July 2013
• Authors: Yun Peng Liu, Jun Qiang Zhang, Zhi Ming Su, Tao Zhao
• Keywords: Dielectric Loss, Energy Moment, FFT, Interpolation

References

[1] Hu guangshu.Discussion of a number of basic questions sinusoidal ignal sampling,Journal of Tsinghua University (Natural Science) . 1997.37(1);74-77

[2] Pan Wen,Qian Yushou,Zhou E.Power harmonics measurement based on windows and interpolated FFT(II)dual interpolated FFT algorithms. Transactions of China Electro technical Society,1994,9(2):

DOI: 10.1109/icit.1994.467114

[3] Zhang fusheng,Geng zhongxing,Ge yaozhong.Power system harmonic analysis of high-precision FFT algorithm, Journal of Electrical Engineering,1999 , 19 (3) ;63-66

[4] Digital Measurement of Dielectric Loss Based on High Accuracy DFT Algorithm,High Voltage Engineering.2003.29(4)3-8

[5] Liguori C, Paolillo A, Pignotti A. Estimation of signal parameters in the frequency domain in the presence of harmonic interference:a comparative analysis.IEEE Transactions on Instrumentation and Measurement,2006, 55(2): 562-569.

DOI: 10.1109/tim.2006.870116

[6] Zhao Wenchun, Ma Weiming, Hu An. FFT algorithm with high accuracy for harmonic analysis in the electric machine. Proceedings of the CSEE, 2001,21(12): 83-87.

[7] Shang yong, Yang mingzhong, Wang xiaorong,et al,Harmonic Analysis dielectric loss factor measurement error analysis. Transactions of China Electrotechnical Society.2002,17(4):67~70

[8] Hou guoping,et al.LABVIEW7.1 Programming and virtual instrument design,Beijing. China: Press of Tsinghua University,(2006)

[9] Gu gengdai,Yang xiaozhong,et al,Numerical Analysis, Science Press,2011,charpt 3.