摘 要

随着电力系统的快速发展，电网容量不断增大，结构日趋复杂，电力系统中实时监控、调度的自动化显得尤为重要，而电力参数的数据采集又是实现自动化的重要环节，如何快速准确地采集系统中各元件的电参数（电压、电流、功率、频率等）是实现电力系统自动化的一个重要因素。

基于此，此次设计采用单片机AT89C51实现电力监控系统的交流采样,即系统采集的是交流电压和电流，不需变送器进行交直流转换。模数转换器AD574A对三相交流电压和电流分时进行模数转换，把得到的数字量送单片机进行数据处理，然后通过LED数码管显示电压和电流，频率，功率，功率因数等的实时值。

文中论述了该系统实现电参数测量的工作原理，着重介绍了该系统的实现过程，在此基础上，详细介绍了整个系统的软件开发过程。

关键词：电力系统；交流采样；单片机；电参数测量 [资料来源：http://THINK58.com]

  [来源：http://think58.com]

[来源：http://www.think58.com]

Abstract

With the rapid development of electric power system, network capacity is increasing, and the growing complexity of the structure, electric power system real-time monitoring and Scheduling Automation is particularly important. The data acquisition of the electric parameters is also an important part of automation. How quickly and accurately acquisition the electrical parameters (voltage, current, power, frequency, etc.) of system components is an important factor to achieve power system automation. [资料来源：THINK58.com]

Based on this,the paper adopts AT89C51 SCM to achieve AC sampling of electric parameters. That the acquisition system is AC voltage and current, transmitter without AC-DC conversion。The A/D converter AD574A makes three-phase AC voltage and current be transformed to digital quantity from analog quantity at different  times . The SCM finishes data processing .Meanwhile, the real-time value of voltage and current , frequency, Power , Power factor are displayed through LED display.

  In the article elaborated this system to realize the electrical parameter survey principle of work, introduced emphatically this system realized the process, based on this, introduced overall system's software compilation process and various subroutines realization in detail.

[资料来源：http://THINK58.com]

  [来源：http://think58.com]

Key words: Electric Power System；AC sampling；Single-Chip Microcontroller, Digital Electrical Parameter Comprehensive Meter

[资料来源：http://think58.com]