一种电网电压信号的快速测量方法

A Rapid Method for Measuring Power Network Voltage Signal

电压是电网的重要参数之一,快速测量电网电压能预防某些电力系统事故发生。分析了传统电网电压交流测量方法在快速性与准确性之间存在的矛盾,提出了一种基于两点采样,能较好协调快速性与准确性的电网电压信号测量方法。该算法先将滤波处理后的电网电压信号送入微处理器,分别在t1处和2t1处进行采样,将采样后的数据利用所提算法进行计算处理,最终获取电网电压信号。基于该算法思想,设计了检测硬件电路和算法程序,进行了实验验证。500次试验结果表明,该测量方法能在2t1(小于等于1ms)的时间内快速测量出电网电压值,测量误差小于0.5%,具有速度快、精度高的特点,适用于电网电压的快速准确测量。

This paper analyzes the traditional AC measurement method of power network voltage which exists contradiction between speedability and accuracy,puting forward two-point based sampling that power network voltage signal measuring method can better coordinate whit the rapidity and accuracy.This algorithm firstly,transform the power network voltage signal into the microprocessor after filtering processing,samples are collected in t1 and 2t1.Secondly,the sampling data using the proposed algorithm to calculation.Finally,get the power network voltage signal.Based on the idea of this algorithm,designed of hardware circuit and the algorithm to detect,verified by experiment.