Lec06 電子學(一) 第二章 Operational Amplifiers

第二章 Operational Amplifiers (1/6) 授課教師：電子物理系 陳振芳教授 課程資訊：http://ocw.nctu.edu.tw/course_detail.... 授權條款：Creative Commons BY-NC-SA 更多課程歡迎瀏覽交大開放式課程網站：http://ocw.nctu.edu.tw/ 本課程同時收錄至國立交通大學機構典藏，詳情請見： http://ir.nctu.edu.tw/handle/11536/10...

The World Economy and the Traditional Confucianism (《新百家學堂》全球經濟與傳統儒學) ( Sun Chen) The impact of globalization on the world economy

NTU Open Forum for New Intellectuals: The World Economy and the Traditional Confucianism (《新百家學堂》全球經濟與傳統儒學) ( Sun Chen) The impact of globalization on the world economy

ELECTRONIC CIRCUITS DR MANAR MOHAISEN PART1 -KOREA UNIVERSITY OF TECHNOLOGY AND EDUCATION

전자회로 한국기술교육대학교 Manar Mohaisen ELECTRONIC CIRCUITS DR MANAR MOHAISEN PART1 -KOREA UNIVERSITY OF TECHNOLOGY AND EDUCATION

On Fault Detection, Diagnosis and Monitoring for Induction Motors-DOCTORAL THESIS-Mohammed Obaid Mustafa Department of Computer Science, Electrical and Space Engineering Signals and Systems

On Fault Detection, Diagnosis and Monitoring for Induction Motors Publication: Research › Doctoral thesis -Mohammed Obaid Mustafa
Department of Computer Science, Electrical and Space Engineering Signals and Systems Research areas Control Engineering

ABSTRACT

In this thesis, multiple methods and different approaches have been established and evaluated successfully, in order to detect and diagnose the faults of induction motors (IMs). The aim of this thesis is to present novel fault detection and isolation methods for the case of induction machines that would have the merit to be implemented online and being characterized by specific novel capabilities, when compared with the existing techniques.

LINK ORIGINAL:http://pure.ltu.se/portal/files/101605364/Mohammed_Obaid_Mustafa.pdf

On High-Frequency Distortion in Low-Voltage Power Systems -Anders Larsson- Luleå University of Technology Department of Engineering Sciences and Mathematics Division of Energy Engineering

Fig. 2.2 Examples of small electronic devices containing power electronics (plus an incandescent lamp). Note the difference in vertical scale between the different waveforms.

DOCTORAL THESIS 
On High-Frequency Distortion in Low-Voltage Power Systems -Anders Larsson- Luleå University of Technology Department of Engineering Sciences and Mathematics Division of Energy Engineering 

 Abstract 

Power quality is a subject that has received a lot of attention during the last 10 to 20 years, both in industry and in academia. Power quality concerns interaction between the power grid and its customers and between the power grid and equipment connected to it, reflected in voltages and currents. Research and other developments in this area have to a great extent concentrated on relatively slow and low-frequency phenomena, with the main emphasis being on voltage dips (reductions in voltage magnitude with duration between about 50 ms and several seconds) and low-frequency harmonics (waveform distortion by frequency components up to about 2 kHz). These phenomena are reasonably well understood and several standards cover the area. For higher-frequency phenomena, above 2 kHz, there is no such general understanding, nor is there anything close to a complete set of standards covering this area. Modern energy efficient equipment connected to the grid, like fluorescent lamps but also solar panels, often uses switching technology, with switching frequencies that can range from a couple of kHz up to several hundreds of kHz. The grid is also used for communication of e.g. meter readings, system controls etc. This so-called power-line communication is using the same frequency range. The main frequency range of interest for this thesis has been the range from 2 to 150 kHz. There are two completely different measurement methods covering this frequency range: time-domain based and frequency-domain based. Time domain based measurements are used throughout the thesis. This gives an opportunity to choose between different analysing tools where among others the joint time-frequency domain has shown to be a useful tool for describing waveform distortion in our frequency range of interest. The majority of the measurements presented in this thesis have been directed towards fluorescent light powered by high frequency ballasts. This type of load has been, due to stringent harmonic limits, one of the first to use a more advanced switching technology called active power factor correction. This technique is also getting more frequently used in other small-power equipment, like computers. Installations of lights in stores etc. normally contain a large number of ballast connected together and the interaction is of importance, for example for setting emission and immunity standards. The measurements on ballasts presented in this work have shown that distortion in the frequency rage 2-150 kHz comes in three types: narrowband distortion; wideband distortion; and recurrent oscillations. The recurrent oscillations are a new type of powerquality disturbance that had not been recognized as such before. The measurements further have shown that the three types of distortion spread in a completely different way from the individual devices to the grid. This knowledge is essential for the setting of emission requirements on energy-efficient equipment.
LINK ORIGINAL:http://pure.ltu.se/portal/files/32571608/Anders_Larsson.pdf