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Statistička estimacija eksploatacionih radnih režima delimično monitorisanih nesimetričnih elektroenergetskih mreža

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2014
Disertacija.pdf (6.473Mb)
Author
Maksimović, Branko
Mentor
Sarić, Andrija
Committee members
Mijailović, Vladica
Tasić, Dragan
Stojković, Saša
Ranković, Aleksandar
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Abstract
U ovoj doktorskoj disertaciji je predložen unapređeni algoritam trofazne estimacije stanja (SE − “State Estimation”), zasnovan na minimizaciji otežanih srednje-kvadratnih odstupanja u aktivnim distributivnim i mikro mrežama. Predloženi su detaljni trofazni modeli: 1) transformatora sa uvaženim gubicima u bakru i gvožđu,spregom namotaja i faznim pomerajem između primara i sekundara (umesto uprošćenih monofaznih modela korišćeni su individualni modeli svih faza sa uvaženim međusobnim uticajem), 2) vodova (tro- i četvoro-žičnih u (ne)spregnutim konfiguracijama), 3)potrošači (naponsko zavisni sa (ne)uzemljenom Y i neuzemljenim Δ) koji kombinuju modele konstantne struje, snage i admitanse, i 4) distribuirani generatori (DG − “Distributed Generation”) na bazi sinhronih generatora, induktivnih generatora, i trofaznih (tro- i četvoro-žičnih) elektronski povezani DG-ovi. Inicijalna unutrašnja snaga nemonitori- sanih (delimično monitorisanih) DG-ova računa se na osnovu eksternih ulaza (iz baze... istorijskih podataka ili vremenske prognoze), kao što su prognoze vetra, sunca, dotoka vode i drugih (zavisno od tipova DG-ova) ili istorijske baze podataka, odnosno na osnovu normalizovanih dnevnih krivih trajanja opterećenja potrošača. Ova merenja se u SE uvažavaju sa nižim težinskim faktorima (tretirana kao pseudo merenja). Unapređeni algoritam trofazne SE uključuje različite tipove monitorisanih, delimično monitorisanih ili nemonitorisanih DG-ova i potrošača).

This PhD presents the improved Weighted Least Square based three-phase state estimation (SE) algorithm for active distribution networks and micro grids (MG). The detailed three-phase component models are developed for: 1) transformers including copper and core losses, winding connection and phase-shifting between primary and secondary windings (an individual phase representation is used, as opposed to a balanced three-phase model), 2) lines (three and four wires in both coupled and uncoupled feeders), 3) loads (voltage dependent grounded-Y, ungrounded-Y and ungrounded-Δ) in a combination of constant current, constant power, and constant admittance models, and 4) distributed generation (DG) units (synchronous generator, induction generator and three-phase (three- and four-wire) electronically-coupled based DG units). The initial internal powers for unmonitored (partially monitored) DG units are calculated on the basis of external inputs (historical database/weather forecast), such as ...wind, sun and water inflow forecasts, etc. (depending on the type of DG unit), or fr om the historical database and from the normalized daily load profiles for loads. These measurements are introduced with lower weights (treated as the pseudo measurements in the proposed SE algorithm). The improved three-phase SE algorithm includes different types of monitored, partially monitored or unmonitored DG units and loads.

Faculty:
University of Kragujevac, Faculty of Technical Science, Čačak
Date:
12-06-2014
Keywords:
Elektroenergetski sistemi / 621.31 / mikro mreža
[ Google Scholar ]
URI
http://nardus.mpn.gov.rs/handle/123456789/3813
http://eteze.kg.ac.rs/application/showtheses?thesesId=1651
https://fedorakg.kg.ac.rs/fedora/get/o:446/bdef:Content/download

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