Modeliranje i simulacija utjecaja kratkih spojeva na generaciju baziranu na pretvaračima

master's thesis

• Title (english): Modeling and simulation of fault contribution of inverter-based generation
• Author: Filip Jakšić
• Mentor: Ivo Uglešić (mentor)
• Committee member: Ivo Uglešić (član povjerenstva)
• Committee member: Francisco Javier Renedo Anglada (član povjerenstva); ISVU oznaka: FR017
• Committee member: Lukas Sigrist (član povjerenstva); ISVU oznaka: LS070
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2021-07-06, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

U ovom radu analizirani su utjecaj, modeliranje i rezultati rada fotonaponske elektrane i distantne zaštite. Obnovljivi izvori energije, u ovom slučaju fotonaponska elektrana, utječu na cjelokupnu zaštitu elektroenergetskog sustava. Okidači većine zaštitnih uređaja reagiraju na veliku injektiranu struju u sustav tijekom kratkog spoja. Međutim, kako se u sustav uključuje sve više i više obnovljivih izvora energije, njihov manji doprinos struji utjecat će nepovoljno na zaštitu sustava. Model fotonaponske elektrane i izmjenjivača rađeni su preko kontrolnih petlji. Najvažnije od njih su DC naponska kontrolna petlja, strujna kontrolna petlja i PLL (phase-locked loop). Relej distantne zaštite sadrži četiri povezana dijela: izračun napona i struje, klasifikator vrste kratkog spoja, izračun impedancije i komparator. Za izračun napona i struja koristi se metoda superponiranih diferencijala koja proizvodi signal korišten u klasifikaciji kratkog spoja. Pomoću klasifikacije, izračuna impedancije i komparatora, šalje se signal prekidaču koji prekida faze koje su u kvaru. Testirani scenariji su: različite vrste kratkih spojeva, različita lokacija kratkog spoja i različita podjela danog kapaciteta i snage između fotonaponske elektrane i sinkronog generatora.

Abstract (english)

In this paper, impact, modeling and results of PV power plant and distance protection relay has been analyzed. Renewable generation, in this case PV plant, affects the grid in terms of protection. As many protection elements are triggered by the excessively amount of current injected from the synchronous generators, small injections from bigger and bigger amount of RES will create a problem. Model of a PV plant and its inverter is done through control loops. The most important for this thesis are DC voltage control loop, current control loop and synchronous reference frame phase-locked loop. Distance protection relay consist of four connected parts: voltage and current calculation, fault classifier, impedance computation and comparator. Superimposed quantities theory has been used for voltage and current calculation from which the signal, that determined the type of a fault, was created. Fault classifier determined the fault and impedance computation with help of comparator confirmed it. At end of the relay, in case of short circuit in the grid, signal triggers single-phase breakers that open the faulted lines. Tested scenarios were different faults, different location of the faults and different PV-SG power scenarios.

• Keywords: Fotonaponska elektrana; kratki spoj; distantna zaštita; metoda superponiranih diferencijala
• Keywords (english): Photo voltaic power plant; inverter; short circuit; distance protection; superimposed quantities theory
• Language: english
• URN:NBN: urn:nbn:hr:168:007184
• 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: 2023-01-13 12:29:57