數(shù)學形態(tài)學及其在電力系統(tǒng)中的應用研究.pdf

1、華中科技大學碩士學位論文數(shù)學形態(tài)學及其在電力系統(tǒng)中的應用研究姓名：趙青春申請學位級別：碩士專業(yè)：電力系統(tǒng)及其自動化指導教師：劉沛20040401IIAbstract Development of signal processing techniques provides new tools for study of power system automation. Traditional Fourier analysis and Wav

2、elet analysis are used widely in various fields such as protective relay and power system control. This dissertation primarily engages in application of Mathematical Morphological. Firstly, Mathematical

3、 Morphological technique including its origin, development and recent application cases on various aspects of power systems are introduced in the dissertation. Several problems on digital protection and detection of powe

4、r quality are discussed in details. Mathematical morphology (MM) is developed from set theory and integral geometry, and is concerned with the shape of a signal waveform completely in the time domain ra

5、ther than the domain frequency. MM has been widely used in the areas of image processing, machine vision and pattern recognition. The mathematical calculation involved in MM includes only addition, subtraction, maxim

6、um, and minimum operations. When acting upon complex shapes of signal, MM operations are capable of decomposing a signal into meaningful parts and separating them from the background, as well as preservi

7、ng the main shape characteristics. This dissertation discusses the applications of MM in power systems, especially in relays and detection of power quality disturbance. The novel approach for detection of power quali

8、ty disturbance based on MM proposed in this dissertation can detect, locate and simply classify the power quality disturbances with white noise. The approach to Ultra- High- Speed (UHS) direction protectio

9、n of a power transmission line based on MM in this dissertation can identify the fault direction from traveling wave signals mingled with intense noise interference. A fault phase selector based on MM

10、transformation is proposed in this dissertation. A MM filter is proposed to detect the faint second changes of sequence currents and implement accelerated trip of power transmission lines in th