【作者】 张君；

【导师】 高强；

【作者基本信息】 华北电力大学（河北） ， 通信与信息系统， 2009， 硕士

【摘要】 本论文介绍了电力线信道噪声通用模型,对现场采集的中、低压电力线噪声数据进行噪声频域特性和时域特性分析,重点对中压信道噪声做相关性计算并建立噪声互相关模型,采用对称分量法分析相关性,得出三相系统相间噪声具有一定相关性的结论。根据两相的噪声一致性特点提出基于自适应最小均方误差(LMS)算法的横向滤波器实现中压电力线通信的噪声对消。针对横向滤波器存在收敛速度慢,学习跟踪能力弱等不足,提出采用格型自适应LMS改进算法。仿真研究表明,噪声对消方法有效提高了10kV中压电力线的信噪比,为10kV配网自动化采用载波通信技术的可靠实现提供了新的途径。更多还原

【Abstract】 This thesis introduced a general model of the power line channel noise, and made an analysis of the frequency and time domain of the noise data gathered from the medium-and-low-voltage power line. The correlation calculation of the medium voltage power line noise and the establishment of the noise correlation model are the focus points. Then the correlation theory has been studied with symmetrical method, and the conclusion that three-phase system noises are associated was drawn. According to the consistency of two-phase noises, the noise offset is achieved through the transversal filter based on adaptive least-mean-square error (LMS) algorithm. Because transversal filter has a slow speed of convergence and is lack of follow-up learning ability, the LMS Adaptive Lattice Algorithm was used. Simulation studies have shown that noise offset method has increased effectively the signal-to-noise ratio of the 10kV medium voltage power line. It provided a new way for the automation of the 10kV distribution network with the carrier communication technology.更多还原