Memorial University DAI: Harmonic analysis of AC/DC converters using the harmonic admittance method

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Title	Harmonic analysis of AC/DC converters using the harmonic admittance method
Author	Rajagopal, Narayanan, 1964-
Description	Thesis (M.Eng.)--Memorial University of Newfoundland, 1993. Engineering and Applied Science
Date	1993
Pagination	xiii, 143 leaves : ill.
Subject	Electric current converters; Harmonic analysis
Degree	M.Eng.
Degree Grantor	Memorial University of Newfoundland. Faculty of Engineering and Applied Science
Discipline	Engineering and Applied Science
Language	Eng
Notes	Bibliography: leaves 130-135.
Abstract	Phase control technique used in ac/dc converters results in the generation of harmonics which can disrupt the operation of critical and sensitive loads. In general, the level of harmonics in the system depends on the interaction between the ac network and the harmonics generated by the converter. -- This thesis develops a technique for the harmonic analysis of phase-controlled ac/dc converters connected to the ac network. The analysis method is based on the harmonic admittance model, which uses the multi-port network concept to define a relationship between the input ac voltages and currents, and the output dc voltage and current. The matrix representation of the relationships is expressed in terms of A, B, C, D parameters, which contain the harmonic components of the switching functions of the converter and the admittance of the commutating inductance. -- A single phase model of the harmonic admittance technique is first implemented. The model is used to determine the harmonics at various nodes in the system. It is shown that in addition to providing quantitative information about the harmonic levels, the model accurately predicts the operating conditions and harmonic instabilities in the system. -- The method is extended to model a three-phase system. For simplicity, the operation of the converter with commutating overlap angle less than 60° (i.e. mode-I operation) is considered. However, based on the procedure described in the thesis, the model for other modes of operation can be developed. The model is used to study the harmonic interaction in a simple HVDC system. Specifically, the distortion at the point of common coupling, the effects of ac source harmonics and unbalance in ac network impedance on the system voltages are investigated. -- The harmonic admittance models developed in the thesis are verified by EMTP simulation. The model accurately predicts the harmonics and system behaviour. It is shown that the harmonic admittance method provides an alternate tool to study the harmonic interactions in power systems with converters.
Type	Text
Resource Type	Electronic thesis or dissertation
Format	Image/jpeg; Application/pdf
Source	Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
Local Identifier	76165754
Rights	The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
Collection	Electronic Theses and Dissertations
Scanning Status	Completed
PDF File	(13.91 MB) -- http://collections.mun.ca/PDFs/theses/Rajagopal_Narayanan.pdf
CONTENTdm file name	200248.cpd