【作者】 程锦；

【导师】 干敏梁；

【作者基本信息】 南京航空航天大学 ， 交通信息工程及控制， 2007， 硕士

【摘要】 线路微机保护装置是一个具有继电保护功能的微机系统,是电力系统发展领域必不可少的保护设备。装置主要由数据采集单元、数据处理单元、开关量输入输出接口和通讯接口四大部分组成。本文在查阅了国内外相关文献资料和研究分析了国内外微机保护技术的发展历史、发展现状及发展趋势的基础上,设计了一套基于TMS320LF2407 DSP技术的微机保护装置。本文基于小波变换理论,针对输电线路中故障数据特征提取,进行了小波理论在其中的应用研究,并在实验验证中取得较好的效果。主要工作内容包括下面几个方面:论文首先论述了微机保护装置的研究意义。其次介绍了系统的总体设计方案,并对其中的数据采集、开关量输入输出、和通讯模块做了详细介绍,阐述了电路的设计方案,并对其中的串口通讯模块进行了调试。然后,本文还研究了小波分析理论,探讨了小波分析应用于电力系统微机保护算法时易发生频域混叠现象的原因,以及混叠现象较易发生的频带,提出了可以有效减轻频域混叠现象的改进的Morlet小波分析方法;并利用MATLAB仿真工具,对故障信号进行算法仿真,取得了比较好的效果,然后将代码移植到基于TI公司的DSP开发软件CCS平台,实现了硬件仿真。本文最后对于今后的工作进行了总结和展望。更多还原

【Abstract】 Transmission line microcomputer protection device is a kind of microcomputer system which provides relay protection to the transmission line,and it’s becoming essentially protective device in the power system development.It’s been comprised of four part:data processing unit,data acquisition unit,digital quantity input/output interface , and the commurication interface.Having consulted the domestic and foreign literature materials, and also analyzed the history,the present situation , the development tendency of the domestic and foreign microcomputers’ relay protective technology, this paper put forwards a kind of microcomputer protection system based on DSP. Based on the wavelet analysis theory, this paper aims at fault data character extraction on transmission line, and dedicates on application of wavelet analysis of this field, exellent result is aquired in the experiment. It mainly includes the following sevral aspects:Firstly, this paper discusses the researching purpose of microcomputer protection .It introduces the overall plan of this system and gives detail introductions of data processing unit,data acquisition unit,digital quantity input/output interface and the commurication interface,then,it proposed a set of protection circuits design plan,and debugged it’s serial port communication model.Sencondly,this paper also researches the wavelet analysis theory ,investigates frequency aliasing phenomenon,the reason why frequency aliasing phenomenon is easy to happen when wavelet is implied in the field of electrical power system microcomputer protective algorithm, and also the frequency bands where frequency aliasing phenomenon is easer to happen, then put forwards the improved Morlet wavelet analysis method which can effectively alleviates frequency aliasing phenomenon,and transplants the code to the TI’s CCS platform to test it’s validity.Finally,the algorithm is tested by MATLAB,the result is proved to be accurate.更多还原