Neizrazito upravljanje sustavom uzbude sinkronog generatora

scientific master's theses

• Title (english): Fuzzy control of synchronous generator excitation system
• Author: Damir Sumina
• Mentor: Gorislav Erceg (mentor)
• Committee member: Zlatko Maljković (predsjednik povjerenstva)
• Committee member: Gorislav Erceg (član povjerenstva)
• Committee member: Juraj Šimunić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; (Department of Electric Machines, Drives and Automation); Zagreb
• Defense date and country: 2005-04-06, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering; Electromechanical Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

Klasična regulacijska struktura uzbude sinkronog generatora uključuje regulator struje uzbude, regulator napona, regulator jalove snage i stabilizator oscilacija radne snage. Upotrijebljeni regulatori imaju proporcionalno ili proporcionalno integralno djelovanje. Stabilizator oscilacija radne snage obično je realiziran metodom fazne kompenzacije.
Primijenjena je neizrazita logika u sustavu uzbude sinkronog generatora. Umjesto proporcionalno integralnog regulatora napona i stabilizatora realiziranog po metodi fazne kompenzacije, u sustav uzbude uključen je neizraziti regulator napona s neizrazitim stabilizatorom oscilacija snage. Pravila i funkcije pripadnosti neizrazitog regulatora i neizrazitog stabilizatora definirane su u polarnom koordinatnom sustavu. Kao ulazni signal i za neizraziti stabilizator i za stabilizator realiziran metodom fazne kompenzacije odabrana je električna radna snaga sinkronog generatora.
Sustav uzbude generatora se sastoji od generatora spojenog na mrežu preko dva paralelna prijenosna voda i transformatora, energetskog kruga uzbude i digitalnog sustava s pripadnim sklopovima povratne veze. Za svaki dio sustava napravljen je matematički model. Pojedini dijelovi su spojeni u jedinstveni model sustava uzbude. Načinjen je simulacijski model sustava regulacije uzbude generatora u programskom paketu Matlab/Simulink.
Neizraziti regulator napona i neizraziti stabilizator oscilacija snage implementirani su u sustav s digitalnim procesorima za obradu signala. Ispitivanje je obavljeno u laboratorijskim uvjetima rada sa sinkronim generatorom snage 83 kVA koji je preko dva paralelna voda i transformatora spojen na mrežu. Parametri neizrazitog regulatora napona i neizrazitog stabilizatora oscilacija snage podešeni su numeričkim pokazateljima kvalitete odziva napona i radne snage generatora te simulacijom.
Uspoređeno je djelovanje neizrazitog regulatora napona s neizrazitim stabilizatorom oscilacija snage i djelovanje klasičnog rješenja (proporcionalno integralnog) regulatora napona uz stabilizator oscilacija snage realiziran po metodi fazne kompenzacije. Usporedba je obavljena u dinamičkim uvjetima kod udarne promjene postavne veličine napona, isklopa jednog voda te tropolnog kratkog spoja na jednom od vodova. Ocijenjene su regulacijske karakteristike neizrazitog regulatora napona i neizrazitog stabilizatora oscilacija snage koje pokazuju poboljšanje u odnosu na proporcionalno integralni regulator sa stabilizatorom realiziranim po metodi fazne kompenzacije.

Abstract (english)

Classical excitation control structure includes excitation current controller, voltage controller, reactive power controller and power system stabilizer. These controllers have proportional or proportional and integral behaviour. The power system stabilizer based on phase compensation method is classical solution.
In this work a fuzzy logic excitation control of synchronous generator is presented. Instead of PI voltage controller and power system stabilizer (based on the phase compensation method) the simple fuzzy logic controller for voltage control and generator stabilization is used. The rules and membership functions of fuzzy logic controller in polar coordinate system are defined. Active power of synchronous generator is used as input signal of classical and fuzzy logic stabilizer.
Synchronous generator excitation system includes synchronous generator connected to the AC grid via two parallel transmission lines and transformer, excitation fed IGBT converter and digital control system. The mathematical model of synchronous generator excitation system is given. Based on this mathematical model an appropriated simulation model in software package Matlab/Simulink was developed.
Fuzzy voltage stabilizing controller is implemented in digital control system based on four digital signal processors. The experimental verification is made on the laboratory setup at the Faculty of electrical engineering and computing, Department of electric machines, drives and automation. The laboratory setup consist of synchronous generator (83 kVA) connected to the AC grid via two parallel transmission lines and transformer, DC prime mover and digital control system. Fuzzy logic controller parameters based on numerical criteria quality of voltage and active power response are tuned.
Control characteristics of fuzzy voltage stabilizing controller is compared with PI voltage controller and classical stabilizer. The comparison is made for three characteristic operation conditions: voltage reference step change, transmission line switching off and three phase to phase fault on the one transmission line. Measured dynamic and static system performances match the calculated and simulated ones. The control characteristics of fuzzy voltage stabilizing controller are evaluated and show an improvement against PI voltage controller and classical stabilizer.

• Keywords: Sinkroni generator; uzbuda generatora; neizrazito upravljanje uzbudom; neizrazita regulacija napona; stabilizacija oscilacija snage
• Keywords (english): Synchronous generator; generator excitation; fuzzy excitation control; fuzzy voltage control; power system stabilization
• Language: croatian
• URN:NBN: urn:nbn:hr:168:453287
• Study programme: Title: Postgraduate master programme in electrical engineering; Study programme type: university; Study level: postgraduate; Academic / professional title: Magistar znanosti elektrotehnike (Magistar znanosti elektrotehnike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2019-07-02 10:29:17