一种基于S变换的动态电能计量算法  

A dynamic electric energy metering algorithm based on S transform

作　　者：邵方静 宋晓林 刘坚 魏宇 尉怡青 赵伟[2] Shao Fangjing;Song Xiaolin;Liu Jian;Wei Yu;Yu Yiqing;Zhao Wei(Marketing Service Centre(Measurement Centre),State Grid Shaanxi Electric Power Company,Xi’an 710199,China;Department of Electric Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]国网陕西省电力公司营销服务中心(计量中心),西安710199 [2]清华大学电机工程与应用电子技术系,北京100084

出　　处：《电测与仪表》2023年第7期100-106,115,共8页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金项目(52077112);国网陕西省电力公司资助项目(5226YX200011)。

摘　　要：现代电力系统中的电压、电流已不再是较理想的稳态正弦波,具有复杂的动态变化特征。动态条件下如何才能足够准确地计量电能,已越来越受到关注。文中从S变换的数学原理出发,提出了一种动态电能计量算法。具体将电能的直流、基波、谐波和间谐波分量分开测算,利用行业协会团体标准中的六种动态测试信号作为该算法的输入,对其在稳态和非稳态情况下的电能计量性能和误差进行了仿真测试和分析,结果验证了相比于现有的两类典型算法,所提出算法在动态条件下能够更准确地计量电能。The voltage and current in modern power system are no longer ideal steady-state sine waves,and have complex dynamic characteristics.It has attracted some attention on how to accurately measure electric energy under dynamic conditions.Based on the mathematical principle of S transform,this paper proposes a dynamic electric energy metering algorithm,which divides electric energy into four components,including DC,fundamental wave,harmonic and inter-harmonic of electric energy.The six dynamic test signals in the association standard are used as the input of the algorithm,and the performance and errors of the electric energy metering under steady and non-steady states are simulated and analyzed.The obtained results verify that,compared with the two conventional algorithms,the proposed algorithm has a better accuracy on measuring electric energy under dynamic conditions.

关 键 词：动态测试信号模型 电能计量 S变换 加窗快速傅里叶变换 小波变换 

分 类 号：TM933[电气工程—电力电子与电力传动]