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Harmonic Source Detection and Determination of Customer and Utility Harmonic Contributions at the PCC

Shojaie, Mehdi | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43851 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Mokhtari, Hossein
  7. Abstract:
  8. Harmonics are of the most important issues associated with electric power quality. Non-linear loads such as power electronic converters are harmonic-producing devices in a network. Due to negative impacts of harmonics such as increased losses and reduced life of network equipment, harmonic analysis of a polluted network, is an essential task. Furthermore, harmonic source identification in order to trace harmonics in a network and adequate implementation of harmonic mitigation techniques is also important. Harmonic contribution determination of a customer at a point of common coupling (PCC) is subjected to difficulties such as harmonic voltage and current interactions, unknown customer and utility harmonic impedances and variant characteristic of the load harmonic current. Although many methods have been proposed to overcome these problems, they are associated with some shortcomings. In order to precisely determine network harmonic impedance, in this thesis, some improvements have been proposed to the harmonic voltage and current correlation method. In addition, a new method based on the correlation of harmonic voltage and current is presented to determine the contribution of non-linear loads in the PCC harmonics. One of the major advantages of this method is to involve the nonlinear load harmonic impedances in the calculations even for variable loads. The performance of the method is also investigated in the presence of capacitors and filters. The accuracy of the proposed method has been confirmed using IEEE 14 bus test system and comparing the results with those of some other existing methods. Finally, the proposed approach has been implemented on two industrial loads in Zanjan medium voltage power system, and the results have been analyzed
  9. Keywords:
  10. Nonlinear Load ; Solidarity ; Norton Law ; Data Correlation ; Harmonic Contribution ; Harmonic Impendance

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