【作者】 成敬周；

【导师】 张举；

【作者基本信息】 华北电力大学（河北） ， 电力系统及其自动化， 2005， 硕士

【摘要】 模糊数学作为一门新兴的学科已经在电力系统获得了广泛应用,近年来在继电保护中的应用也相继开展。本文在分析了模糊基本原理及现有应用的基础上,提出一种故障选相的新原理。该原理使用小波提取相应频段暂态信号特征,对提取的信号特征进行相关分析,使用模糊集合对相关系数的隶属度综合评判进行选相。提出一种基于模糊集合理论的电力系统单相自适应重合闸算法,用滤波后的采样值对幅值、单端及双端相位、功率等识别判据建立相应的相似性测度及模糊隶属函数,并进行了模糊集综合算法识别线路故障性质。探讨了CPLD/FPGA 与DSP 构成的各种硬件方案在模糊保护中的应用,包括DSP 的外围芯片式、专用信号处理芯片式及片上系统式,并提出多DSP 并行处理式的设计方案。更多还原

【Abstract】 Fuzzy theory considered as a burgeoning subject is applied in many fields of power system,so much as in protective relay field. After analyzing the basic principle of fuzzy theory and its application in power system protection relay, this paper presents novel technique for fault phase selection in EHV power system based on transient protection theory. Wavelet transform is proposed to extract the high frequency signals and correlation analysis is applied to the results. When different types of fault occurred, the feature of the high frequency signals has different similar relations. By analyzing the characteristics of faults, a series of new principles are preferred base on fuzzy set. A new scheme applying fuzzy set theory to the single-pole adaptive reclosure is proposed. Then the fuzzy measures and memberships of a series of new criterions such as magnitude, phase and power are proposed. It uses the fuzzy set synthetically to distinguish permanent fault and instant one occurred on EHV lines. This paper will try to discuss all kinds of hardware platforms realizing the fuzzy protective relay, in which CPLD/FPGA act as peripheral fetch chip, special digital processor and system-on-chip mode. This paper will also propose a novel mode which CPLD controls DSP.更多还原