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Suppression of higher harmonics resonance in a distribution system
Author(s) -
Sugimura Shouji,
Naitoh Tadashi,
Toyama Atsushi,
Ohta Fumihiko
Publication year - 2012
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.22307
Subject(s) - harmonics , eigenvalues and eigenvectors , resonance (particle physics) , control theory (sociology) , current (fluid) , point (geometry) , pulse width modulation , distribution (mathematics) , topology (electrical circuits) , physics , mathematics , computer science , engineering , voltage , mathematical analysis , control (management) , electrical engineering , quantum mechanics , geometry , artificial intelligence
There are many PWM control devices, which are higher harmonics current sources, in distribution systems, and higher harmonics cause overcurrents by parallel resonance. To avoid overcurrents, it is necessary to suppress resonance. In this paper, a new suppression method, which uses the effect of source connected points in resonance circuits, is proposed. First it shows that the optimal point, which gives a minimum current amplification degree, is orthogonal to the static condenser voltage. Then, using the eigenvector of the state equation, the participation factor is defined. When the participation factor is zero, the orthogonality condition is introduced. Therefore, the optimal point is obtained with the participation factor. Finally, numerical investigation shows that multiple optimal points usually exist. Therefore, we can choose the most advantageous point as a source‐connected node. © 2012 Wiley Periodicals, Inc. Electr Eng Jpn, 182(1): 18–29, 2013; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/eej.22307