摘要
本文在目前电力系统交流采现实现方法的基础上提出了用于交流采样的系统频率倍频信号的可靠提取的硬件方法，以及复功率四象限变化时有功和无功大小、方向的计算方法。
Based on the various of A/C sampling in power systems,the high frequence multiplier used in A/C sampling and the method of calculating size and direction for active power and reactioded in this paper.
