毕业设计（论文）-基于虚拟仪器的稳态电能质量检测.doc

摘要
传统的电能质量参数测量系统以硬件为核心,功能单一、成本高,已经无法满足日益复杂的、多参数的测试要求。近年来,随着电子技术和计算机技术的飞速发展,新的测试理论和方法、新的仪器结构不断出现,测量仪器的功能和使用发生了质的变化,其中最显著的一点就是虚拟仪器的出现与发展。虚拟仪器是计算机技术与测试测量仪器技术相结合的产物,具有硬件结构简单、可自定义仪器功能、数据处理和分析功能强大的优点,同时可以实现历史数据管理和图形化显示等功能。
因此,本论文通过分析国内外电能质量测试装置的发展现状,针对目前电能质量测试过程中所遇到的问题,研究开发出一种基于虚拟仪器的稳态电能质量分析与检测系统。该系统能够准确检测出电网频率、频率偏差、电压偏差、三相不平衡度、电压波动、电网谐波等电能质量参数,并对其进行实时分析,将分析结果实时的显示出来。论文首先简要地介绍了虚拟仪器的概念及构成,针对电能质量检测的研究现状,论述了将虚拟仪器技术应用于电能质量检测的必要性,介绍了系统的总体结构。其次,论文介绍了电能质量参数测量原理,对检测系统的设计及检测作了详细的阐述。软件实现方面,首先对虚拟仪器开发平台 Labview 及其编程语言作了简要介绍,然后详细论述了软件总体结构,对电能质量参数测量的各个模块的实现作了详细的说明,并对电能质量参数的测量的结果进行了分析。
该测试系统具有扩展性和复用性强的特点,可以显著提高电能质量测试的自动化程度。因此,使用虚拟仪器进行研究、设计、测试将成为电力系统测试领域的一种趋势。最后,就本系统在研究中存在的不足和需要完善的地方做了总结,指出课题的进一步研究工作。
关键词:虚拟仪器,Labview,电能质量,电压波动,三相不平衡度,谐波
Abstract
The traditional Power parameters measuring system mainly based on hardware is single-function and high-budget, so it is unsuitable gradually plicated and multiparameter test. Recent years, with rapid progress of electronic technology puter technology, new testing theory and method, new instrument structure is appearing. Function and application of measuring instruments has changed a lot. One marked characteristic is appearance and development of Virtual Instrument with the advantage of simple hardware structure, user-defined, powerful data processing and analysis function. Besides, Virtual Instrument can achieve the function of history data management and graphical representation.
Therefore, by analyzing the status of power quality testing set home and abroad, in connection with the problems being filled across during testing of power quality, a power quality testing system based on Virtual Instrument is studied and exploited in this thesis. The testing system can measure power quality parameter, such as frequency, frequency deviation, voltage deviation, and three-phase degree of unbalance, voltage hunting and harmonic. These parameters also can be analyzed real-time and be displayed in real time. Firstly,basic conception and structur