【作者】 张秋丽；

【导师】 黄纯；

【作者基本信息】 湖南大学 ， 电气工程， 2010， 硕士

【摘要】 故障录波数据是分析电力系统故障的重要依据。为了有效地利用海量故障录波文件对故障情况进行分析,提高工作效率,及时准确地了解故障原因、类型和状况,迅速地做出处理,减小故障损失,本文对故障录波信息的分析方法进行了研究并对电力故障录波信息分析系统进行了开发。首先,对电力系统故障信号的分析方法进行了研究,分析了离散傅里叶(DFT)算法中衰减直流分量引起的误差,推导了精确的误差计算公式,并据此对传统DFT算法的计算结果进行修正,进而提出了一种改进的DFT递推算法。并给出了该算法的具体推导过程和计算步骤,算法不需计算衰减直流分量的幅值和衰减时间常数,而能精确地计算基波和各次谐波参数。用MATLAB软件进行了仿真分析,仿真结果证明了该算法精度高,计算量小、响应速度快,易于实现,适合于故障信号的基波和谐波的参数测量。其次,对电力系统暂态数据交换通用格式(COMTRAD)技术细则和电力系统故障动态记录技术准则进行了研究,完成了COMTRADE标准格式录波文件记录数据的读取和非标准格式录波文件向COMTRADE标准格式的转换。再次,在深入考察目前国内外故障录波装置的发展状况以及各种故障信息处理系统的结构特点与实现技术的基础上,对电力故障录波信息分析系统的总体结构和功能实现进行了详细的分析和设计,并分别介绍了系统中信息采集、数据通信、故障分析等组成部分的功能要求和实现方法。最后,在Visual C++6.0平台上设计并实现了基于COMTRADE格式录波文件的故障录波信息分析系统。该系统可实现故障录波文件的数据远传、故障信号的波形再现和灵活显示,具备录波文件管理及故障电气参量测量、谐波分析、相量分析和序分量分析等故障信号分析功能。更多还原

【Abstract】 Analysis of fault data is an important basis for power system fault. In order to analyze the fault situation effectively, the massive fault recorder files should be used. By analyzing recording datum, we can understand the cause, the type and the condition of the malfunction accurately and timely, so we can make a decision quickly. Thus, the efficiency can be improved and the fault loss can be reduced. The power fault recording information analyzing method is researched and analyzing system is developed in this paper.First, by studying analyzing method of the power fault recording information, the error caused by the decaying DC component in traditional Fourier algorithm is analyzed, and the accurate expressions of the error is deducted.Therefore, this paper proposes an improved recursive discrete Fourier algorithm which can eliminate the interference of decaying DC component effectively.Then, the fundamental frequency component and each harmonic are estimated by eliminating the error from the result of traditional Fourier algorithm, without calculating the decaying component parameters, and the result has high accuracy. The algorithm is of simple calculation and fast response, and is convenient to be realized. The algorithm is suitable for measuring the fundamental frequency component and each harmonic parameters of fault signal.Second, IEEE Standard Common Format for Transient Data Exchange (CO MTRADE) for Power system is analyzed in this paper. Recording data can be read into program, and the non-standard format of the fault recorder files can be convert into the standard format transformation of COMTRADE.Third, the development of fault recorder and the structure and characteristics of the fault recording information system at home and abroad is investigated in detail. On this basis, the paper makes a design of the overall structure and function for the power fault recording information analyzing system. The system can be divided into three parts by structrue, which is the information acquisition, data communication and fault analysis. The structure and function of the three parts are introduced individually in this chapter.Finally, the power fault recording information analysis systems is designed and developed by Visual C++6.0 platform. The system can reproduce and flexi bly display the waveform of the fault signal, moreover, it has the functions of recording wave file management and fault electrical parameters measurement,har monic analysis, phase analysis and fault signal sequence component analysis.更多还原