【作者】 李小将；

【导师】 钱清泉； 何正友；

【作者基本信息】 西南交通大学 ， 电力系统及其自动化， 2008， 硕士

【摘要】 电力暂态信号分析是电力系统故障诊断和暂态保护的基础与依据,在及时处理电力系统故障、预防电力系统灾变、电能质量分析、故障测距与定位、设备状态监测、暂态稳定性分析等诸多领域得到了广泛应用。小波分析是电力系统暂态信号分析的一种新兴工具,用来实现电力系统暂态信号的检测与分类;将模极大值提取、统计处理方法、神经网络分类、熵计算方法、能量分布分析等与小波分析相结合,构成小波后处理方法,更有效的应用到故障定位与测距、继电保护及电力系统在线检测等实际中。本文根据小波理论及小波后处理方法在电力暂态信号分析中的应用,开发一套独具特色的电力暂态信号小波分析虚拟仪器软件。论文采用UML建模语言进行软件的概要设计,明确小波分析仪软件的功能需求;使用NI公司的LabWindows/CVI集成开发环境,基于PCI-6143数据采集板卡、硬件配置助手、硬件驱动函数和内置的测量库完成多线程数据采集功能;使用其强大丰富的函数库如数学函数、函数数据运算函数、高级信号分析库等库函数和理解各种信号处理算法基础上完成如FFT、STFT、连续小波变换、离散小波分析、小波包变换等信号处理功能模块;并利用小波变换结果完成了小波熵等小波后处理计算模块;完成基于模极大值的行波故障测距模块;完成基于TCP/IP网络函数库和自扩展Modbus/TCP工业协议的网络通信模块,实现分布式应用;最后,软件经过严格的单元测试及功能测试,软件可独立、稳定、可靠运行,各项功能计算结果准确无误,有望将小波分析仪应用到电网运行工程实践中,同时成为探讨新的继电保护原理和实现新的继电保护装置的实验平台,实现电力系统故障诊断及在线检测、故障测距和继电保护等应用。更多还原

【Abstract】 The analysis of transient signal is the basement and foundation in fault detection as well as transient protection of the power system, and it is also applied widely in many fields of power system, such as dealing with the fault in time and prevent cataclysm in power system, power quality analysis, fault location and distance computation, apparatus status supervision and transient stability analysis etc.Wavelet theory is a new tool used in transient signal analysis, which is used to realize detecting and classifying electric power transient signal etc;The wavelet post-analysis meanings is formed by wavelet combined with the modal maximum extraction, statistics processing meanings, neural network、entropy computation, energy distribution etc, which applied in actual system more effectively such as electric power system detection lively、fault location and distance computation、relay protection etc. In this paper, a particular and characteristic virtual instrument system software of electric power transient signal is developed based on the application of wavelet theory and the pose-analysis meanings in electric power transient signal analysis.This paper adopts UML modal language to outline the specify function requirements of the wavelet analysis software. And the data acquisition module based on multi-thread technology is realized, which used the integration development environment of the National Instrument Corporation named LabWindows/CVI and the PCI-6143 data acquisition board、hardware configuration assistant、hardware drivers as well as many inner measure libraries; The different signal algorithms such as FFT、STFT、Continuous Wavelet Transformation、Discrete Wavelet Transformation and Wavelet Packet Transformation is complete which employed the abundant function libraries in CVI as follows: Mathematical and advanced signal analysis libraries as well as others; The software be able to computer the wavelet entropy and carry through the wavelet post-analysis utilized the results of the wavelet transformation; The traveling wave fault location and distance computation module based on the wavelet mould maximum is achieved; The distribute application module is fulfilled based on the TCP/IP network function and the self-extension industry protocol Modbus/TCP; At last, the software is tested strictly through cell testing and function testing to conclude that the software can run independently、stability、credibility and exactly, which shows that there is a wide prospect for applying the software to electric engineering running practice, with the addition of becoming the experiment platform of probing into the new relay protection principle and new protection devices, implementing the electric power system fault diagnosis and detecting online、fault location and distance computation and relay protection etc.更多还原