【作者】 周蓓霞；

【导师】 李巴津；

【作者基本信息】 内蒙古工业大学 ， 控制理论与控制工程， 2006， 硕士

【摘要】 与计算机技术相结合,是测试仪器发展的主流,由此而产生的虚拟仪器技术,已经成为测试仪器技术中的重要领域。本课题将虚拟仪器技术引入电网谐波测试之中,开发和研究了基于虚拟仪器的便携式谐波分析仪,采用计算机和UA301A数据采集器作为虚拟仪器的硬件平台,LabVIEW作为虚拟仪器的软件平台,使用FFT算法进行谐波分析。论文首先分析了谐波的危害、国内外谐波研究现状以及谐波测量算法,介绍了虚拟仪器的开发技术、系统所依据的基本理论以及系统软硬件开发平台。然后详细说明了系统软件体系结构,包括数据采集器与LabVIEW的接口驱动设计和软件应用程序设计。使用采集器提供的准同步和同步采样方式对信号进行采样,对采样的数据使用FFT算法进行实时谐波分析。最后进行仿真、实验电路的搭建及实验系统的参数测量。该系统软件部分由人机界面、数据传输和数据处理部分组成。系统主界面测量功能包括频谱测量、谐波分析和功率测量三个模块。对测量数据保存为Excel格式,显示图形保存为bmp格式。经仿真和实验系统的参数测量,证明了系统设计的合理性和可行性。更多还原

【Abstract】 The mainstream of test instruments development is that it is combined with the computer technology. Therefore virtual instruments technology has become an important field of test instruments technology. In this paper the virtual instrument technology is used to the power system harmonics measurement and the virtual instrument on harmonics analysis is developed and studied using a computer and UA301A data acquisition as the hardware platform and LabVIEW as the software platform of the virtual instrument. FFT algorithm is used for harmonics analysis.Firstly it is the analysis of the harmonics hazards, the harmonics research status in home and aboard and the measurement algorithms on harmonics in the paper. Then it introduces the development technology of virtual instruments, the basic theory that the system depends on and the hardware and software development platform of the system, and then a detailed description of the system software architecture is shown, including the interface driving program design between the data acquirement and LabVIEW and the software application program design using the way of the quasi-synchronous sampling and synchronous sampling to acquire data of the signal. FFT algorithm is used to make the real–time harmonics analysis. Finally it carrys through a simulation, the experiment circuit design and the measurement of parameters of the experiment system.The software of the system is composed by the human-machine interface, data transmission and data processing. The measurement functions of the main interface in the system include three modules--spectrum measurements, harmonics analysis and power measurements. The measured data are saved to Excel format and the shown graphics are saved to bmp format.Through the simulation and the measurement of parameters in experiment system, it proves that the design of the system is reasonable and feasible.更多还原