单片机在电机功率因数测量中的应用

Application of single-chip-microcomputer in power factor detection of three-phase alternating current machine

在电力系统管理过程中,有必要对功率因数进行实时、准确的测量。介绍了通过测量单相电流及电压之间的相位差来得到三相系统的功率因数的检测方法,并对该方法的测量原理做了详细说明。由于使用80C196KC单片机的外部事件高速输入HSI记录电流、电压过零比较器先后发生正跳变的时刻,从而能够稳定、高速地计算出三相系统的功率因数。实验结果表明,该方法具有很好的实时性和稳定性。

It is necessary to detect the power factor in the course of electric power system management. The designing manner of the power factor detection of three-phase alternating current machine is presented. It is counted by the phase difference of angle between onephase electric current and the same phase voltage. As HSI of single-chip-microcomputer of 80C 196KC＇s external event is used to record the time when the current or voltage reaches zero, the power factor of three-phase system is given at high speed. The principle of measurement is particularly illustrated. The experimental result shows that this method has the feature of quickness and stability.