Державне Освітнє Установа
Вищого Професійної Освіти
"Норільський Індустріальний Інститут "
РЕФЕРАТ
по англійської мови:
"Аналіз проблем оцінки якості електроенергії "
Виконав:
Прохоров А.Л.
Перевірив:
Смирнова А.Т.
Норильськ, 2010. br/>
TABLE OF CONTENTS
Introduction
1. Analysis of power quality problems
2. Different kinds of disturbances
2.1 Frequency variations
2.2 Voltage amplitude variations
2.3 Voltage fluctuations
2.4 Flicker
2.5 Voltage dips - short interruptions
2.6 Waveform variation
2.7 Interharmonics
2.8 Unbalance
3. Conclusions
4. My research
ЗМІСТ
Введення
5. Аналіз проблем електропостачання
6. Різні види спотворень
6.1 Зміна частоти
6.2 Зміна амплітуди
6.3 Флуктуації напруги
6.4 Доза флікера
6.5 Осідання напруги
6.6 Зміна форми хвилі
6.7 Некратні гармоніки
6.8 Асиметрія напруг
7. Висновок
8. Список літератури
Introduction
In recent years power quality issues have captured the attention of many researchers, energy suppliers and customers. The problem of controlling power quality is becoming more relevant because of the widespread use of non-linear and time-varying single-phase or three-phase loads that increasingly affect the operation of distribution networks in residential, commercial and industrial areas. Power quality deterioration is due to transient disturbances (voltage sags, voltage swells, impulses, etc.) and steady-state disturbances (harmonic distortion, unbalance, flicker). The main causes of such disturbances as well as the detrimental effects they have on the electrical systems are described. Among these issues, harmonics are investigated more accurately in this article. Some definitions relevant to non-sinusoidal systems are provided in order to deeply understand the solutions proposed in the remainder. A topic several researchers are interested in is that non-linear loads should not be considered the only cause of the detrimental effects related to power systems. The responsibility for the power quality deterioration should be shared between the supplier and the customer. This kind of information could be provided by indices in a straightforward and simple way. The traditional indices used by the international standards cannot satisfy these specifications. To this purpose, a new index to evaluate the above-mentioned harmonic distortion phenomena in the supply electrical networks is more deeply discussed.
1. Analysis of Power Quality problems
Electricity is an essential aspect of today's society...
