电测与仪表2017，Vol.54Issue(5)：80-84,5.
基于Lagrange插值频率估计的数字电能计量算法
Digital power metering algorithm based on Lagrange interpolation frequency estimation
摘要
Abstract
In traditional electric energy metering system,the signal acquisition of the power grid voltage and current waveform is finished by electronic energy meter,the meter designs frequency tracking circuit,and the synchronous sampling can be achieved under the condition of the power grid waveform frequency fluctuation,and electricity measurement error is small.In digital power metering system,the sampling of power grid waveform is done by A/D module which has a fixed sampling frequency of electronic transformer or merging unit,and it can't achieve the real-time tracking grid frequency synchronous sampling,and electricity measurement error is bigger under the condition of frequency fluctuation,therefore,in order to reduce the error of electricity energy metering,this paper proposes a new algorithm of digital power metering,the method extracts the fundamental frequency of the power grid by using the Lagrange interpolation algorithm,and extracts the waveform component by using the fence effect of discrete Fourier transform algorithm,which realizes the energy calculation.This method is simple,and the experimental simulation verifies its electricity measurement error is small,and has a practical value.关键词
拉格朗日插值/数字电能计量/DFT/频率波动/电能计量算法Key words
lagrange interpolation algorithm/digital electricity metering/DFT/frequency fluctuation/electricity metering algorithm分类
信息技术与安全科学引用本文复制引用
张秋雁,魏伟,李红斌..基于Lagrange插值频率估计的数字电能计量算法[J].电测与仪表,2017,54(5):80-84,5.基金项目
中国南方电网公司科技项目(K-G2014-096) （K-G2014-096）
