Papers by Farhad Safargholi
The aim of this paper is to present an improved algorithm to solve harmonic load flow problem in ... more The aim of this paper is to present an improved algorithm to solve harmonic load flow problem in balanced radial distribution systems with laterals, which have nonlinear load. The method is efficient and easy to implement. This method is iterative and allows the evaluation of both, voltage (rms) values and phase angles of the fundamental voltage and harmonic voltage for each bus. The proposed method in this paper can be solved harmonic load flow problem iteratively from two sets of recursive equations. The first set concern the determination of the branches current by going up the line (backward sweep). The second one allows us to determine the nodes voltage by going down the line (forward sweep). The total harmonic distortion can also be calculated easily.
Unity Power Factor at the Power Supply Side for MATRIX Converter Fed PMSM Drives
International Journal of Electrical and Computer Engineering (IJECE), 2014
Discrete or event type power quality (PQ) disturbances mainly include voltage sags, swells, and t... more Discrete or event type power quality (PQ) disturbances mainly include voltage sags, swells, and the transients. An extensive literature survey suggests that there is no generally accepted method for characterization of these disturbances and suitable limits are not yet found in any international standard. One of the reasons for the lack of characterization methods is the difficulty of defining suitable site indices for each discrete disturbance type. In this paper existing characterization methods are reviewed and discussed. A new generalized approach is then given to show a better way of characterizing voltage sags, swells and transients. This is followed by a proposed new method of defining MV/LV distribution discrete disturbance limits for general utility networks and their suitability is shown by an examination of some Australian sites.
The harmonic survey of a medium voltage distribution system involves three major aspects: (i) the... more The harmonic survey of a medium voltage distribution system involves three major aspects: (i) the choice of harmonic monitor, (ii) the choice of monitoring site, (iii) processing and presentation of results. As well as a discussion of the methodology for these aspects, the paper will discuss the harmonic levels measured, the minimum survey requirements for finding useful data and the harmonic parameters of residential, commercial and industrial loads.
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Papers by Farhad Safargholi