重采样移相技术在过程层IED中的应用

Application of resample phase shifter technique in process layer IED

介绍了一种重采样相位补偿算法,该算法可对异步采样造成的相位误差进行补偿。分析了同步采样和异步采样的优缺点,介绍了重采样移相技术中常用的插值算法,在异步采样系统中应用抛物线插值算法,实现对采样值的相位补偿,并从理论上分析了该算法对工频信号中的基波和高次谐波的精度影响。经实验验证,对于采用异步采样模式的过程层IED,应用重采样移相技术可以达到补偿相位的效果,补偿后的精度能够满足电子式互感器标准的精度要求。

This paper introduces a resample algorithm that can compensate phase error caused by the asynchronous sampling.It analyzes the advantages and disadvantages of the synchronous and asynchronous sampling,and introduces the commonly algorithms of resample techniques.The parabolic interpolation algorithm is applied to compensate the sampling’s phase in asynchronous sampling system,and the algorithm’s effect is theoretically analyzed to fundamental and the high-order harmonic on the precision.By experiment test,for process layer IED with asynchronous sampling system,the interpolation algorithm can achieve the effect of phase compensation.Compensated sampling value will be able to meet the standard of electronic transformer accuracy.