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Sinkroni reluktantni motori sve više se koriste u industriji zbog visoke korisnosti i otpornosti na industrijske uvjete. U radu je opisan postav za automatizirano ispitivanje gubitaka i korisnosti sinkronih reluktantnih motora po zahtjevima norme IEC-60034-2-3. Sustav automatizirano prolazi kroz radne točke definirane normom i zapisuje mjerene podatke u odvojene blokove podataka za svaku radnu točku. Korišten je napredni sustav za akviziciju podataka Dewesoft Sirius. Zahvaljujući automatizaciji postava, ispitivanje je standardizirano i ponovljivo. Ispitivanje je provedeno za kombinacije pet sinkrono reluktantnih motora i tri frekvencijska pretvarača za napajanje motora. Synchronous reluctance motors are increasingly used in industry due to their high efficiency and durability in industrial conditions. The paper describes a setup for automated loss and efficiency testing of synchronous reluctance motors according to the requirements of the IEC-60034-2-3 standard. The system automatically runs through the operating points defined by the standard and records the measured data in separate data blocks for each operating point. An advanced Dewesoft Sirius data acquisition system was used. Thanks to setup automation, testing is standardized and repeatable. The test was performed for combinations of five synchronous reluctance motors and three frequency converters powering the motors.

Obnovljivi izvori energije danas igraju ključnu ulogu u proizvodnji električne energije. Proizvodnja iz sunčeve energije sve se više širi kroz industriju i privatni sektor. U ovom radu dan je pregled najčešćih topologija istosmjernih pretvarača za povezivanje fotonaponskog modula na spremnik energije te pregled izmjenjivača za spajanje modula na izmjeničnu mrežu. Također je dan pregled MPPT algoritama koji se mogu implementirati u takve sustave. U programskom alatu PLECS izrađen je model sustava u kojemu je fotonaponski modul spojen na baterijski spremnik energije. Simulacijom je prikazan rad sustava za različita ozračenja i temperature modula. Pomoću elektro-toplinskih modela simulirani su gubici poluvodičkih sklopki. Today, renewable energy sources have a key role in the production of electric energy. Production from solar energy is more and more expanding through the industry and private sector. An overview of power converters for battery storage systems and inverters for grid-connected systems in photovoltaic applications is given in this paper. The most common MPPT algorithms are also described. This thesis gives a detailed model of a photovoltaic system in which the module is connected to the battery storage. The model is made in PLECS software package. The simulation is carried out for different irradiation and temperatures of a solar module. Thermo-electrical models of the switches were made to simulate semiconductor losses.

Sinkroni reluktantni motori sve više se koriste kao zamjena za asinkrone motore u općim industrijskim namjenama kao što su na primjer pogoni pumpi, kompresora, pokretnih traka, ventilatora itd. Oni moraju biti napajani iz frekvencijskog pretvarača. U tom smislu važno je djelovanje cijelog sustava pretvarač – motor i utjecaj jednog elementa na drugi. U ovom radu ispitan je utjecaj pretvarača na korisnost reluktantnog motora kojeg napaja. Obavljeno je određivanje gubitaka i korisnosti dostupnih reluktantnih motora (ABB, Siemens) sukladno normi IEC 60034–2–3 na različitim kombinacijama pretvarača (ABB, Siemens, Danfoss). Synchronous reluctance motors are increasingly being used as to replace induction motors in general industrial applications such as, for example, pumps, compressors, conveyors, fans, etc. They must be supplied by a power converter. This raises the question of the operation of the entire variable-speed drive system and the influence of one element on another. In this paper, the influence of the power converter on the efficiency of the reluctance motor is studied. The losses and efficiency of two different reluctance motors (ABB, Siemens) were determined according to IEC 60034–2–3 standard with different combinations of converters (ABB, Siemens, Danfoss).

U ovom završnom radu objašnjen je rad vjetroelektrana. Opisan je razvoj iskorištavanja energije vjetra, te današnji trendovi i kapaciteti. Objašnjen je izbor lokacije vjetroelektrane, kao i Posebni uvjeti za priključak vjetroelektrana na hrvatsku prijenosnu mrežu. Objašnjeni su glavni dijelovi vjetroelektrane, s naglaskom na generator i frekvencijski pretvarač. Pokazani su razne izvedbe vjetroelektrana s prednostima i nedostacima. Razmatran je utjecaj vjetroelektrana na EES, kao i mogućnosti apsorbiranja većeg broja vjetroelektrana u hrvatsku prijenosnu mrežu. In this final paper, the operation of wind power plants is explained. The development of wind energy utilization and current trends and capacities are described. The choice of location of wind farms is explained, as well as the Special conditions for connection of wind farms to the Croatian transmission network. The main components of the wind farm are explained, with an emphasis on generator and power converters. They demonstrated various wind farm designs with advantages and disadvantages. The impact of wind power plants on the electricity system was discussed, as well as the possibility of absorbing more wind power plants in the Croatian transmission network.

U ovom diplomskom radu modeliran je dio hrvatske elektroenergetske mreže unutar kojeg su u VE Vrataruša mijenjani tipovi generatora te je analiziran njihov utjecaj na prijelaznu stabilnost okolnih generatora. Cijeli model promatranog sustava je napravljen u programskom paketu ETAP 16.0.0. Praćeni su promjene izlazne električne snage generatora te kuta opterećenja za vrijeme i nakon poremećaja u mreži. Ispitivan je utjecaj sinkronog turbogeneratora, asinkronog generatora tipa 1, dvostruko napajanog asinkronog generatora te sinkronog generatora spojenog preko frekvencijskog pretvarača. Na temelju analize doneseni su neki zaključci. Također prije praktičnog dijela analizirana je teorija prijelazne stabilnosti sinkronog i asinkronog generatora te različite studije koje se bave sličnom problematikom. In this thesis, part of Croatian power grid is modeled using ETAP 16.0.0 software. In the bus of wind turbine Vrataruša, the type of generator was changed and was analyzed its impact on transient stability of the nearest generators. Changes of electrical power and generators angle were observed during and after the fault. There were tested the impact of synchronous turbo-generator, induction generator type 1, doubly fed induction generator (DFIG) and synchronous generator with power converter. Before developing this test model, theory of transient stability of synchronous and induction generators were analyzed and also the different studies with same problematic.

Obnovljivi izvori energije, posebno vjetroelektrane, danas zauzimaju sve značajnije mjesto u cjelokupnoj proizvodnji električne energije. U radu su opisani tipovi generatora koji imaju primjenu u vjetroelektranama, te su navedene prednosti i nedostaci pojedinog rješenja. Osim generatora opisani su i tipovi uređaja energetske elektronike te problemi vezani uz kvalitetu električne energije uslijed njihovog pogona. U radu su opisani zahtjevi za kvalitetu električne energije s obzirom na propisana „Mrežna pravila“ i europsku normu EN 50160. Analizirani su podaci o proizvodnji vjetroelektrane Danilo te njezin utjecaj na mrežu s obzirom na kvalitetu električne energije na mjestu priključka sa elektroenergetskim sustavom. Renewable energy sources, especially wind farms, represent an important role in total electricity generation today. Types of generators that are used in wind farms and advantages and disadvantages of particular resolutions have been presented in this paper. Besides generators, this paper describes types of power electronics equipment and possible problems that are related to the quality of electrical energy while their drive is on. Furthermore, requirements for the quality of electrical energy considering prescriptions of “Network Policy” and the European standard EN 50160 are also presented. Data about wind farm Danilo production and effects on its network have been analyzed considering the quality of electrical energy in the place where it is connected to electrical power system.

U ovom završnom radu prikazan je proces izrade reguliranog stabiliziranog izvora napajanja, te teorijska i praktična analiza rada uređaja koje su izvršene radi međusobne usporedbe. Regulirani stabilizirani izvor napajanja električki je uređaj energetske elektronike čija je svrha povezivanje izmjenične pojne mreže sa istosmjernim trošilom uz mogućnost regulacije istosmjernog izlaznog napona, a sastoji se od ispravljača, te regulatora napona kao njegova dva podsustava. Snimljeni su valni oblici napona i struja ključnih elemenata uređaja, te je snimljena izlazna karakteristika za tri naponske razine na temelju koje je izračunat faktor stabilizacije napona kao mjerilo kvalitete i pouzdanosti uređaja. This paper shows the process of making a regulated stabilized power supply, and theoretical and practical analysis of the device that were made for intercomparison. Regulated stabilized power supply is electrical device of power electronics designed to connect the AC network with DC loads with the possibillity of regulation of the DC output voltage, and consists of a rectifier and voltage regulator as its two subsystems. Voltage and current waveforms of the main elements are measured, and the output characteristic is measured for three voltage levels on the basis of which is calculated a voltage stabilization factor as a measure of the quality and reliability of the device.

Power converters for traction application have some specificities that has strong impact on their design. Apart from standard requirements, there are some emerging ones. The evolution of power converters for traction application is mainly dictated by the required weight, volume and cost reduction. Power module, which is a mechanical assembly of different functional parts, is the key element for traction application. The main aspects in designing power modules are highlighted, and some limitations explained. Future trends in design of power converters for traction application are specified. Several practical solutions of power converters for typical traction applications: main power supply converters, auxiliary power converters and traction converters, are presented.