数字电能计量采样值丢帧处理方法

Handling Methods for Sampled Value Frame Missing in Digital Power Metering

相对于传统电能计量系统,采样值丢帧是数字电能计量引入的新问题。对几种常见的丢帧处理方法进行了仿真分析,包括对丢失点填零、用上一个点代替丢失点和对丢失点进行插值三种方法。仿真结果表明,前两种方法引入的误差较大,最后一种方法引入的误差较小。在采用较复杂算法时,误差可以忽略不计。其中,从性能和复杂度综合考虑,拉格朗日三次内插算法是推荐算法。

Compared to conventional power metering system, sampled value frame missing is a new technical issue introduced by digital power metering system. Several handling methods for this problem are simulated and analyzed, including replacing missing values with zeros, replacing missing values with last valid value and reproducing missing values by interpolation algorithm. Simulation shows that the former 2 methods would cause rather bigger errors, while the last one would cause smaller errors. The error of some complex interpolation algorithms can be ignored. In view of both performance and complex, 3-order internal Language interpolation is a recommended algorithm.