Weighting Method to Identify Interharmonics based on Calculating the Bandwidth in Group-Harmonics

Hani Vahedi; Alireza Alizadeh Kiapi; Mohammad Tavakoli Bina; Kamal Al-Haddad

Weighting Method to Identify Interharmonics based on Calculating the Bandwidth in Group-Harmonics

Hani Vahedi

Alireza Alizadeh Kiapi

Mohammad Tavakoli Bina

Kamal Al-Haddad

Vol. 13, No. 1, pp. 170-176, Jan. 2013

10.6113/JPE.2013.13.1.170

Fast Fourier transform

GHW Bandwidth Calculation

Group-Harmonic Weighting

Interharmonics

PDF

Abstract

Power converters produce a vast range of harmonics, subharmonics and interharmonics. Harmonics analyzing tools based on the Fast Fourier Transform (FFT) assume that only harmonics are present and the periodicity intervals are fixed, while these periodicity intervals are variable and long in the presence of interharmonics. Using FFT may lead to invalid and undesired results due to the above mentioned issues. They can also lead to problems such as frequency blending, spectral leakage and the picket-fence effect. In this paper, the group-harmonic weighting (GHW) approach has been presented to identify the interharmonics in a power system. Afterwards, a modified GHW has been introduced to calculate the proper bandwidth for analyzing the various values of interharmonics. Modifying this method leads to more precise results in the FFT of a waveform containing inter harmonics especially in power systems with a fundamental frequency drift or frequency interference. Numerical simulations have been performed to prove the efficiency of the presented algorithm in interharmonics detection and to increase the accuracy of the FFT and the GWH methods.

Statistics

Show / Hide Statistics

Cumulative Counts from September 30th, 2019
Multiple requests among the same browser session are counted as one view. If you mouse over a chart, the values of data points will be shown.

Cite this article

[IEEE Style]

H. Vahedi, A. A. Kiapi, M. T. Bina, K. Al-Haddad, "Weighting Method to Identify Interharmonics based on Calculating the Bandwidth in Group-Harmonics," Journal of Power Electronics, vol. 13, no. 1, pp. 170-176, 2013. DOI: 10.6113/JPE.2013.13.1.170.

[ACM Style]

Hani Vahedi, Alireza Alizadeh Kiapi, Mohammad Tavakoli Bina, and Kamal Al-Haddad. 2013. Weighting Method to Identify Interharmonics based on Calculating the Bandwidth in Group-Harmonics. Journal of Power Electronics, 13, 1, (2013), 170-176. DOI: 10.6113/JPE.2013.13.1.170.