基于LabVIEW的电能质量动态监测仪的设计

发布时间：2018-03-10 22:29

本文选题：电能质量　切入点：LabVIEW　出处：《郑州大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年来，随着经济的飞速发展，工业生产和居民生活用电量的大幅增加，随之而来的是人们对于电能质量的关注。电能质量的优劣不仅影响工业的正常生产和居民的日常生活，还间接反映了一个国家的经济实力。因此如何解决供电质量的监测和优化问题得到了各界人士的关注，本文将从电能质量监测的背景、意义以及解决办法等几个方面来进行阐述。本文首先介绍了电能质量监测的背景和意义，分析了目前投入生产使用的监测仪器的特点，说明了这个课题的重要性。查阅相关资料和国家标准，了解了电能质量监测的五大指标的规定及允许范围。重点分析了各个指标的检测算法，总结出每种算法的特点，找到适合在LabVIEW平台上实现的方法，然后结合虚拟仪器技术，利用研华数据采集卡和工控机共同搭建了基于LabVIEW平台下的电能质量动态监测仪。作为良好的人机交互界面，，LabVIEW软件平台和硬件结合方便，图形化的编程语言更容易理解和修改，在编程过程中，重点进行了前面板和程序面板的设计。尤其是对于间谐波的测量分析，采用了加窗FFT结合大采样率的方法，同时进行阈值判断和相邻值比较，使测量结果更加具体和精确。除此之外，对于数据的储存和读取也采用了分时分段不同间隔的方法，便于长时间的数据储存和读取，为今后电能质量缺陷的研究和分析提供了科学的数据和报告。最后，利用软件平台的仿真功能进行测试，分别验证了电能质量动态监测仪的界面控制和显示功能以及对电量信号的采集、测量、分析、储存、回放等功能，说明该监测仪具备了优良的在线监测和实时分析的性能，相比其它监测设备，操作更简单、存储更方便。
[Abstract]:In recent years, with the rapid development of economy, the industrial production and residential electricity consumption have increased dramatically, followed by the attention of people to the power quality, which not only affects the normal production of industry and the daily life of residents. It also indirectly reflects the economic strength of a country. Therefore, how to solve the problem of monitoring and optimizing the quality of power supply has attracted the attention of people from all walks of life. This paper will focus on the background of power quality monitoring. The meaning and the solution and so on several aspects to carry on the elaboration. This paper first introduces the background and significance of power quality monitoring, analyzes the characteristics of the monitoring instruments used in production at present, and explains the importance of this subject. In this paper, the regulations and permitted range of five indexes of power quality monitoring are understood. The detection algorithms of each index are analyzed emphatically, the characteristics of each algorithm are summarized, and the method suitable to be realized on LabVIEW platform is found, and then the virtual instrument technology is combined. The power quality dynamic monitor based on LabVIEW platform is built by using Yanhua data acquisition card and industrial control computer. As a good human-computer interface, LabVIEW software platform and hardware are combined conveniently, and the graphical programming language is easier to understand and modify. In the process of programming, the design of front panel and program panel is emphasized, especially for the measurement and analysis of interharmonics, the method of windowed FFT combined with large sampling rate is adopted, and the threshold value is judged and the adjacent value is compared. Besides, for data storage and reading, time-sharing and piecewise different intervals are also used to facilitate data storage and reading for a long period of time. It provides scientific data and report for the research and analysis of power quality defects in the future. Finally, the simulation function of the software platform is used to test and verify the interface control and display functions of the power quality dynamic monitor, as well as the functions of collecting, measuring, analyzing, storing, replaying and so on. It shows that the monitor has excellent performance of on-line monitoring and real-time analysis. Compared with other monitoring equipment, it is easier to operate and more convenient to store.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM930

【参考文献】