Simultana izmjenična i istosmjerna uzbuda transformatora s otvorenom jezgrom

master's thesis

• Title (english): Simultaneous AC and DC excitation of a transformer with open core
• Author: Matea Golub
• Mentor: Damir Žarko (mentor)
• Committee member: Damir Žarko (predsjednik povjerenstva)
• Committee member: Stjepan Stipetić (član povjerenstva)
• Committee member: Zlatko Hanić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2019-07-08, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

HVDC sustavi omogućuju ekonomičniji prijenos energije na velike udaljenosti te jednostavnije povezivanje različitih sustava. Najzastupljenija topologija u takvim sustavima je MMC (engl. Modular Multi-level Converters). Jedan od glavnih izazova je rješavanje problema koje u takvim sustavima stvaraju puzne i geomagnetski inducirane struje. Zbog toga je jedan od glavnih zahtjeva za specijaliziranu visokonaponsku opremu mogućnost istovremene izmjenične i istosmjerne uzbude. Upravo s tom namjenom se koriste jedinice bazirane na konceptu otvorene jezgre jer imaju prirodno prisutan zračni raspor zbog kojeg sporije dolaze u zasićenje. Dodavanjem zračnih raspora, jedinica s otvorenom jezgrom može uzemljiti još veće struje što je pokazano primjenom analitičkog proračuna, numeričkog proračuna te mjerenjem na stvarnom modelu. Mogućnost simultane izmjenične i istosmjerne uzbude je provjerena računskom simulacijom te mjerenjem na stvarnom modelu.

Abstract (english)

HVDC transmission enables economical power delivery across long distances and a convenient way to connect systems with different characteristics. The most common topology present in those sistems is Modular Multi-level Converters. One of the main challenges is solving problems caused by leakage and geomagnetic currents present in those systems. DC capability is therefore one of the main requirements for high voltage equipment. That is the main reason why open-core units are used, because their geometry includes a naturally present air gap which makes it less prone to saturation. When additional air gaps are added, the reactor can ground higher currents which is confirmed by results of analytical calculations, numerical calculations and measurements on realistic models. DC capability is calculated and verified by measurements on a real open-core unit.

• Keywords: HVDC; modularni višerazinski pretvarači; otvorena jezgra; prigušnica; EMTP; Infolytica MagNet
• Keywords (english): HVDC; MMC; star point reactor; open core; DC capability; EMTP; Infolytica MagNet
• Language: croatian
• URN:NBN: urn:nbn:hr:168:658972
• Study programme: Title: Electrical Engineering and Information Technology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije (magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2020-01-07 18:11:00