摘要
采样值报文的抖动会导致电子式互感器数据同步的插值精度出现偏差,甚至在报文抖动幅度较大时出现严重的插值错误,进而导致间隔层测控装置出现误测量或保护装置不正确动作。针对此问题,以工程中常用的线性插值算法为背景,建立了报文的抖动影响下电子式互感器数据同步的插值模型,推导了线性插值算法的插值误差;根据信号中是否包含谐波分量,分别仿真计算了稳态和暂态情况下各影响因素对线性插值算法插值精度的影响。计算结果表明:在低采样速率时,报文抖动对数据同步插值算法的影响不明显,随着采样速率的增加,报文抖动对插值算法插值精度的影响增大;插值误差的大小与报文的抖动幅度成正比。此外,报文抖动影响下谐波的波次及幅度也使线性插值算法的插值误差增大。研究结果对于分析存在报文抖动时,电子式互感器数据同步的插值精度具有重要意义。
The message jitter of the sampling value will cause the deviation of electronic transformer data synchronization,and even result in severe interpolation error in case of large jitter amplitude,which leads to the misoperation of measuring and protecting devices in bay level. Aiming at this problem,the data synchronization interpolation model of electronic transformer is built in the presence of message jitter utilizing the linear interpolation method as background,and the interpolation error of linear interpolation algorithm is deduced. According to the composition of harmonic component in signals,the influences of each factor on the interpolation accuracy is calculated at steady and transient states. The calculation results show that when the sampling rate is low,the influences of message jitter on data synchronization algorithm is slight. With the increasing of sampling rate,the influences grow larger,and the interpolation error is in proportion to the amplitude of message jitter. Besides,the growth of harmonic order and amplitude will enlarge the interpolation error. The research results provide important reference for analyzing the interpolation accuracy of electronic transformer data synchronization in the presence of message jitter.
出处
《电测与仪表》
北大核心
2016年第7期66-73,共8页
Electrical Measurement & Instrumentation
关键词
报文抖动
电子式互感器
数据同步
线性插值
message jitter
electric transformer
data synchronization
linear interpolation
