市电参数测量仪的设计

Design of Parameter Measuring Instrument for Utility Power

摘要:

为了实现市电质量监测并降低测量成本,以STC12C5A60S2微处理器为控制核心,利用电压有效值转换芯片等器件,设计了一款市电参数测量仪,对频率、电压有效值及失真度进行测量；基于测周法实现50 Hz频率的测量,通过一块电压有效值转换芯片测量总电压有效值与谐波电压有效值,实现市电电压的测量,并通过计算获得失真度值；实验结果表明,该测量仪测量精度较高,频率测量误差小于0.1%,电压有效值测量误差控制在1%以内,失真度测量误差小于5%；该测量仪结构简单、性能稳定,可应用于电能质量监测系统。

Abstract:

In order to monitor the quality of utility power and reduce measuring cost, a parameter measuring instrument is designed to measure frequency, the voltage effective value and distortion, with STC12C5A60S2 microprocessor as the control core and by using the voltage conversion chip and other devices. The measurement of 50 Hz frequency is based on the method of measuring cycle, and the effective value of the total voltage and harmonic voltage are measured by an effective value conversion chip, thus the voltage measurement of utility power is realized, and the distortion value is obtained by calculating. Experimental results show that the measuring precision of the instrument is high. The error of frequency measurement is less than 0.1%, the voltage effective value measurement error is controlled within 1% and the distortion measurement error is less than 5%.And the measuring instrument has simple structure and stable performance, and it can be applied to the power quality monitoring system.