529 research outputs found
POSTOLACHE G., VEGETAȚIA REPUBLICII MOLDOVA, SECOND EDITION
No full textThe work entitled Vegetation of the Republic of Moldova, 2nd edition, authored by Dr. hab. Gheorghe Postolache, published at the State University of Moldova, National Botanical Garden (Institute) “Alexandru Ciubotaru” in Chișinău, Republic of Moldova, in 2024, represents a larger, revised and enriched reedition of the first edition of the same work published under the name of the same author, in 1995
Analysis of three-phase systems with neutral under distorted and unbalanced conditions in the symmetrical component-based framework
No full text
Triplen harmonics: myths and reality
No full textIn a symmetrical and balanced three-phase system with distorted waveforms, a well-known rule states that each harmonic order corresponds to a specified sequence (positive, negative or zero). In this ideal case, the current in the neutral conductor (or more generally in the return path) contains only triplen harmonics. However, this rule is no longer valid in practical distribution systems subject to unbalance and waveform distortion, in which phase and neutral currents at any sequence generally contain components of any harmonic order. Possible improper extension of the ideal case concepts to general situations may create a sort of myth, to be removed by providing tutorial and practical examples. This paper provides a direct quantification of the extent to which non-triplen harmonics are present in the zero-sequence current components and triplen harmonics are present in the positive and negative sequence current components. An original set of indicators, built on the basis of the theoretical symmetrical component-based framework developed by the authors, is introduced for assessing the specific impact of the triplen harmonics at the different sequences. Some classical myths based on the ideal case are illustrated and discussed on specific examples including theoretical cases and experimental analyses, quantifying the actual role played by the triplen harmonics in these applications
Experimental evaluation and interpretation of the harmonic distortion in unbalanced systems
No full textOperational and computational aspects of the neutral conductor interruption in low-voltage distribution systems
No full textProc. 4th Symposium CEE 200
Power quality issues in the regulation of the electricity services
No full textProc. 4th CNR-CIRED Symposium CEE 200
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