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Harmonic Sharing Determination between a Load and Utility in Multi Input - Multi Output Feeders

Maleki Delarestaghi, Javid | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49142 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Mokhtari, Hossein
  7. Abstract:
  8. Harmonic distortions are one of the most important power quality issues in power systems. Nowadays, vast peneteration of the power electronic devices and nonlinear loads, which are the harmonic-producing devices in a network, causes increase in harmonic distortion level in distribution systems, which has negative impacts. The high level of harmonic peneteration in power system can lead to increase in losses and reduction of network equipment’s life. So, system operators have to find and improve some solutions to control the harmonic level. In this way, investigation in harmonic contribution of major nonlinear loads and utilities is a criticl task, specially when a harmonic problem occures. Some methods have been proposed by researchers to calculate the haramonic contribution in a busbar with one input and one output. The input represent the utility and the output is the nonlinear load. Harmonic contribution determination of a customer at 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. However, harmonic contribution determination of different utilities and customeres at a multi-input multi-output (MIMO) feeder has not been investigated yet. In order to precisely determine network harmonic impedance, in this thesis, two methods have been proposed to determine the contribution of non-linear loads in the MIMO feeder. One of the major advantages of this method is finding the utility harmonic impedance presicely. The performance of the method is also investigated in the loop configuration of distribution systems. 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
  9. Keywords:
  10. Power Quality ; Harmonic Impendance ; Harmonic Contribution ; Feeders ; Harmonic Pollution

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