高精度单相电力参数的测量方法

HIGH-PRECISION MEASURING METHOD OF SINGLE-PHASE ELECTRIC POWER PARAMETER

文章给出了两种单相电力线路参数的测量方法 ,详细论证了 V/F转换器件的积分功能 ,并论证了其在 URMS,IRMS和 P值测量中的应用。由于考虑了在测量中电网电压频率的偏移和波形的失真 ,并依据 URMS,IRMS和 P的原始定义进行设计 。

This paper gives us two measuring methods about the parameter of single phase electroniccircuit and a detailed proof about integral function of V/F transformer, and their application to the measure of U RMS , I RMS and P . Considering the excursion of the frequency of electrified wire netting voltage and amplitude distortion, according to original definition of U RMS , I RMS and P , the authors can achieve high precision measure. The electric power parameter measurement described in this paper is to measure the parameters of the power frequency ( f c =50 Hz ± 1 Hz) alternating current of powered circuit, that is the voltage and current effective value, apparent power, active power, reactive power, power factor, and so on. As a result, voltage wave, current wave and frequency in alternating current network rely on generator and running condition of load and have a change of environment in supply power. Therefore, the frequency always changes in a specified range randomly, and then its sinusoidal wave has some distortion, and by convention, it would cause a great error . This paper joins in the discussion according to the following two methods. The first method is to use a specific integrate circuit (AD637). It can brings about square, equal value, square root of true efficiency and direct current convert IC. The second method is to make use of parameter measurement of simulation multiplier and V/F converter It does measuring of P, U RMS , I RMS . The above two methods is based on the originnal definition of efficient value etc. Thus, the methods can realize the power parameter measurement with high precision and low cost.