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Optimizacija vodenja pogonskega sklopa ventilatorskega sistema
ČADEŽ, MATEJ (Author), Fišer, Rastko (Mentor) More about this mentor... This link opens in a new window

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Abstract
Vodenje večjega števila motorjev z enim frekvenčnim pretvornikom (FP) je že nekaj desetletij predmet raziskav, v zadnjem času pa je zanimivo predvsem za proizvajalce matričnih prezračevalnih sistemov, v katerih prevladujejo sinhronski motorji s trajnimi magneti (SMTM). Cilj pričujočega dela je tako na primeru ventilatorskega pogona raziskati različne konfiguracije vezave dveh ali več SMTM, ki jih vodimo z enim FP, in razviti regulacijski algoritem, ki bo zagotavljal stabilno obratovanje pogona pri različno obremenjenih SMTM, pri čemer se osredotočimo predvsem na analizo zaporedne vezave dveh SMTM. Uvodni del bralca seznani s pojmom matričnega ventilatorskega pogona, čemur sledi opis FP in metod vodenja pogonov s FP. Nato so iz tuje literature povzete znane rešitve vodenja dveh vzporedno vezanih SMTM, pri čemer sta podrobneje izpostavljeni strategiji izbora nadrejenega motorja in tehnike povprečenja. Slednjo lahko brez teoretičnih zadržkov apliciramo pri zaporedni vezavi in zato predstavlja osnovo pri razvoju simulacijskega modela dveh zaporedno vezanih SMTM. Osrednji del je sprva namenjen analizi stabilnosti modela dveh zaporedno vezanih SMTM, kjer predstavimo tako analitično kot simulacijsko pot, kako priti do karakteristike lege polov. Na podlagi le-te je bilo ugotovljeno, da sprememba v magnetenju zagotovi stabilno obratovanje dveh različno obremenjenih zaporedno vezanih SMTM. To dognanje je vodilo do razvoja ustreznega regulatorja magnetilnega toka, saj s tem zmanjšamo dodatne izgube v navitjih motorjev. Delovanje regulatorja smo simulacijsko preverili tudi za zaporedno vezavo treh oz. štirih SMTM. Vpeljava ocenjevalnika povprečne kotne hitrosti v simulacijski model povzroči dodatne težave pri zagotavljanju stabilnosti sistema, a določeni simulacijski rezultati nakazujejo možnost stabilnega obratovanja pogona tudi v tem primeru. V zadnjem delu je najprej opisana realizacija praktične aplikacije ventilatorskega pogona s komercialnim FP. Čeprav je takšna izvedba najcenejša, ima kar precej omejitev, ki onemogočajo apliciranje ustreznih predhodno razvitih regulacijskih rešitev. Ob koncu je podana primerjava med zaporedno in vzporedno vezavo, kjer so izpostavljene prednosti in pomanjkljivosti posamezne konfiguracije.

Language:Slovenian
Keywords:matrični ventilatorski sistem, SMTM, frekvenčni pretvornik, zaporedna vezava SMTM, vzporedna vezava SMTM, tehnika povprečenja, vodenje večjega števila SMTM, analiza stabilnosti, regulator magnetilnega toka
Work type:Master's thesis/paper (mb22)
Organization:FE - Faculty of Electrical Engineering
Year:2018
Views:589
Downloads:473
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Secondary language

Language:English
Title:Control optimization of electrical drive system in a fan wall
Abstract:
Mono-inverter multi-machine systems have been subject of researches for many decades. Nowadays, they are interesting for manufacturers of fan arrays which usually consist of permanent magnet synchronous motors (PMSM). The main aim of this thesis is to explore different configurations of multi-connected PMSM controlled by single frequency converter (FC) which can be used in fan drive systems and to develop a control method which will ensure stable operation of the system when different load torque is applied to each PMSM. The main subject of analysis is mono-inverter dual serial-connected PMSM system. In the opening part, fan array concept, FC and basic drive control methods are presented. Then control solutions for parallel-connected PMSM are summed up from other authors' research papers. We focused on master/slave and average technique methods. The latter can be used in serial-connected PMSM system without being modified. In the main part, stability of dual serial-connected PMSM system is analysed analytically and with the help of Simulink Linear Analysis Tool. The analysis results showed that change of magnetization is needed to stabilise the system. In order to reduce the additional losses magnetizing current controller is proposed. Simulation models consisting of two, three and four serial-connected PMSM were used to test its behaviour. Adding an average angular speed observer to the simulation model causes extra stability problems. Despite that, some simulations have shown possibility of stable operating of the drive with sensorless angular speed control. In the final part, limitations of using commercial FC in dual connected PMSM system are discussed and substantiated with experimental results. Additionally, the comparison between serial and parallel connection of PMSM is made where the pros and cons of each solution are highlighted.

Keywords:fan array, PMSM, frequency converter, serial-connected PMSM, parallel-connected PMSM, average technique, mono-inverter multi-PMSM system, stability analysis, magnetizing current controller

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