电力系统谐波测量系统论文(毕业设计)-精品.docVIP

电力系统谐波测量 摘 要 近年来，随着现代工业的迅速发展，电力电子器件的应用日益广泛，随之带来的谐波污染也越来越严重，已经严重的影响到了电能质量，而且对各种用电设备的正常运行带来了消极影响。谐波测量是谐波问题研究的主要方面，实时、准确地检测电网中的谐波含量，确切掌握电网中谐波的实际状况对于防止谐波的危害保障电网安全运行是十分必要的 本文首先阐述了电力系统谐波产生的原因、谐波危害等以及电力系统各种谐波分析与检测方法。简单对傅立叶变换的谐波检测法、瞬时无功功率理论、神经网络的优缺点进行比较，为进一步的基于瞬时无功功率谐波分析与检测法研究做铺垫与参照作用。本文研究重点首先根据瞬时无功功率理论，比较了两种谐波电流的检测方法法和法。本文主要运用算法，其方法不仅在电网电压畸变时适用，在电网电压不对称时也同样有效，将原始电流信号进行按不同频带分离，进而完成基波与谐波的分离达到对电网中的谐波电流进行检测的功能。文章最后基于瞬时无功功率理论的ip-iq算法，并借助MATLAB进行了仿真，最后给出仿真结果，验证了该方法的有效性和结论的正确性。 关键字：电力系统；谐波；瞬时无功功率理论；MATLAB仿真 ABSTRACT The underground Shield is a special tunnel digging machine which integrates mechanics,electrics,hydraulics,and information technology,With the rapid step of city construct,many Shields work at one time,which need high demand of operation reliability. The contents of this paper is to shield the state of monitoring equipment. Shield running information collected by status monitor system are saved in the database with the type of time series. The database of the ring data to the database failure that exist in time series data for similarity comparison, view the sequence of the match,So the time series similarity-pattern to modeling is applied to realize the Shield fault forecast. In this paper, the use of Euclidean distance to calculate the similarity between sequences. Finally,the Shield fault diagnosis system based on above theories is come true with the Visual Studio 2008 development environment. Testing in the state there are many issues worth exploring in this paper is an attempt to study, work remains to be further in-depth. Keywords: Underground Shield; Time series similarity; condition monitoring 目 录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc232876213 1 绪 论 PAGEREF _Toc232876213 \h 1 HYPERLINK \l _Toc232876214 1.1 谐波检测的研究背景及意义 PAGEREF _Toc232876214 \h 1 HYPERLINK \l _Toc232876215 1.2 国内外电力谐波检测与分析方法研究现状及发展 PAGEREF _Toc232876215 \h 2 HYPERLINK \l _Toc232876216 1.3 谐波抑制技术的发展现状 PAGEREF _Toc232876216 \h 5 HYPERLINK \l _Toc232876217 1.4 本文的主要工作 PAGEREF _Toc232876