（毕业设计论文）《单片机实现交流参数检测》.docVIP

PAGE 摘 要 对于电力参数进行高精度、多参数的测量，是充分了解电网的运行状况，寻找并解决电力系统中出现问题以及实现电力系统自动化的重要途径。因此对于电力参数的测量，尤其是高精度、多参数、低价格、便携、稳定的实时测量就显得尤为重要，也一直是人们研究的一个重要的方向。 本文简述了交流采样原理的产生和发展，对交流采样法中的二种主要方法即同步采样法和准同步采样法做了基本介绍，并分别对其特点进行了比较。而硬件同步采样法因其硬件开销不是很大，软件量相对较小，测量所需时间短，适宜做在线实时检测。因而，本文采用此种方法。系统采用STC89C54单片机来实现电力参数的交流采样，通过液晶显示器显示频率、电压和电流的实时值。结果表明，采用交流采样方法可以进行数据采集,并采用运算获得电压、电流、频率等电力参数，它们均有很好的精确度和稳定性。单片机测量交流电量参数方案是进行电能监控系统的一部分。通过对本系统进一步完善，能够作为电力部门及用户收费，付费系统。因而，该系统具有广泛的应用前景。 关键词 交流采样原理 电参数 测量系统 ABSTRACT It is very important for acquiring the running state and solving the problems of the power supplying system to perform high accurate, multi-parameter, low-cost, portable, real time and stable measurement of power parameters. It is also one major subject on which the researchers have focused for many years. In this paper, the production and development of the Alternating Current (AC) sampling principle is simply explained. And the two main methods, namely, in-phase sampling and standard in-phase sampling technique are basically introduced and compared by their characteristics. However, the hardware in-phase sampling method fits for the real-time detection because the hardware spending is not very great, the software has the less proportion and the less measurement time is needed. Thus, this method is adopted in this paper. The STC89C54 Single Chip Microcomputer (SCM) is utilized to realize the AC sampling of the electric power, then, the real-time frequency, phase difference, voltage and voltaic is displayed by the LCD. The results demonstrate that the AC sampling method can get data and the power parameters of the voltage, electric current, power, which have the high precision and stability. The SCM scheme is used to measure the AC parameter, which is a part of the power supervision system. More improving of the system can utilize as the power corporations and consumers of charge and pay out system. So the system possesses the very broad application foreground. Keywords Digital Sampling Principle