Razvoj i primjena uređaja za mjerenje kvalitete električne energije

scientific master's theses

• Title (english): Development and application of power quality measurement device
• Author: Dalibor Brnobić
• Mentor: Nedjeljko Perić (mentor)
• Committee member: Josip Butorac (član povjerenstva)
• Committee member: Nedjeljko Perić (član povjerenstva)
• Committee member: Juraj Šimunić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; (Department of Control and Computer Engineering); Zagreb
• Defense date and country: 2005-09-23, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering; Automation and Robotics
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

Trajno nadziranje kvalitete električne energije na važnijim točkama elektroenergetskih sustava postaje bitna stateška odluka u uvjetima dereguliranog tržišta. Podaci prikupljeni sustavnim mjerenjem upotpunjuju se ciljanim terenskim mjerenjima kojima se lociraju uzročnici primjećenih problema ili istražuju utjecaji značajnijih izvora smetnji na razdjelnu mrežu električne energije. U okviru rada je na osnovi relevantnih normi, uočenih nedostataka komercijalnih uređaja i predviđenih daljnjih aktivnosti postavljen koncept, te prema njemu realiziran prototip prijenosnog uređaja za mjerenje kvalitete električne energije. Osnovnim mjernim funkcijama pridodane su napredne registracijske funkcije za praćenje dinamike potrošnje mjerenjem faznih struja, strujnih harmonika, snaga i iz njih izvedenih veličina, te funkcije snimanja struje pokretanja i zahvaćanja oscilograma mjernih signala. Radi određivanja ključnih čimbenika koji utječu na točnost mjerenja postavljen je model širenja pogreške pri mjerenju efektivnih i harmoničkih veličina. Mjernim uređajem ispunjeni su svi zahtjevi norme IEC 61000-4-30 i njoj pridruženih normi za uređaje klase B, izuzme li se nerealizirano mjerenje treperenja. Laboratorijska ispitivanja potvrdila su točnost metoda mjerenja i ispravnost modela propagacije pogreške. Primjenjivost naprednih mjernih funkcija prikazana je u opisanim terenskim mjerenjima, a modularna izvedba sklopovlja, nadzornog programa i dobro strukturirani podaci omogućavaju brzu i jednostavnu prenamjenu razvijene mjerne platforme.

Abstract (english)

Continuous monitoring of power quality on key points of utility systems has become an important strategic issue in deregulated power markets. System measurements are supplemented with on-site measurements that are conducted as a part of a troubleshooting procedures or surveys of large disturbance sources influence onto distribution systems. A concept of a power quality measurement device based on relevant standards, noted shortcomings of commercial devices and projected activities is given in this thesis. A prototype of a portable power quality measurement device is realized. In addition to standards, the prototype is equipped with current measurement inputs and methods for load current, power and power factor registration in four-quadrant manner, current harmonics, inrushes and scope screen-saving functions. Due to a study of major factor influence on a measurement uncertainty, a model for noise and error propagation in effective values and harmonics measurement chain was developed. All prerequisites of standard IEC 61000-4-30 and complementary standards for class B instruments are fulfilled. Exception is a flickermeter function that is not implemented. Laboratory tests proved measurement accuracy and error propagation model fitness. Practical values of advanced functions are shown in presented on-site measurements. Modularity in a hardware and software layer and well-structured data allows easy and efficient readjustment of developed measurement platform.

• Keywords: Kvaliteta električne energije; niskofrekvencijske konduktivne smetnje; harmonička mjerenja; sustavi za rad u stvarnom vremenu; mjerna nesigurnost
• Keywords (english): Power quality; low-frequency conducted disturbances; harmonic measurements; real-time systems; measurement uncertainty
• Language: croatian
• URN:NBN: urn:nbn:hr:168:314861
• 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: 2019-07-03 08:43:31