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Tokovno vodene pulznoširinske modulacije izhodne napetosti pretvornikov za napajanje izmeničnih motorjev. Del 1, AnalizaČučej, Žarko ; Cafuta, Peter, 1951-Prispevek obravnava analizo in sintezo pulznoširinske modulacije (PŠM) izhodne napetosti močnostnih pretvornikov za napajanje motorjev (IM), ki izhajajo iz vodenja motorskih tokov. V prvem delu ... -analizi- je obravnavana možnost optimiranja tokovno vodenih modulacij. Opisane so značilnosti optimiranja v koordinatnih sistemih a-b in d-q. Povzeta so merila optimiranja in izpeljana je predikacija trajanja preklopnih stanj pretvornika. Opisano je optimiranje z iskanjem, podano je trajanje računanja optimiranja ter napovedane so možnosti poenostavitve optimiranja. V drugem delu - skoraj optimalne modulacije - je opisana sinteza modulacij, ki so s svojimi lastnostmi blizu optimalnim modulacijam iz prvega dela. Odlikujeta jih preprostost izvedbe in direktna vključenost v regulatorje v koordinatnem sistemu d-q. V tretjem delu - vodenja v drsnem režimu - obravnava skupka pretvornik-motor kot sistema s spremenljivo strukturo vpelje vodenje motorja v drsnem režimu. Pokazano je, da so pogoji obstoja drsnega režima vseh preklopnih funkcij skladni s pogoji oblikovanja skoraj optimalnih modulatorjev. Za razred diagonalno dominantnih sistemov sta kot rezultat analize realnega drsnega režima izbrani Ljapunovi funkciji, ki določata nujen in zadosten pogoj obstoja drsnega režima na presečišču preklopnih površin, hkrati pa omogočita optimiranje preklopnega zaporedja pretvornika. Postopki so v drugem in tretjem elu verificirani s simulacijami,ki potrjujejo prednost predlaganih rešitev pred znanimi modulacijami.Source: Elektrotehniški vestnik. - ISSN 0013-5852 (65, št. 4, 1998, str. 177-184)Type of material - article, component partPublish date - 1998Language - slovenianCOBISS.SI-ID - 4049174
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Čučej, Žarko | 04778 |
Cafuta, Peter, 1951- | 05543 |
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