一种基于频率自适应多阶准同步算法的直流动态电能计量方法  

A DC Dynamic Energy Measurement Method Based on Frequency Adaptive Multi⁃order Quasi⁃Synchronization Algorithm

作　　者：岑炜 段永贤 段晓萌 黎小军 张知杰 耿爱玲 CEN Wei;DUAN Yongxian;DUAN Xiaomeng;LI Xiaojun;ZHANG Zhijie;GENG Ailing(China Electric Power Research Institute,Beijing 100192,China;Marketing Service Center,State Grid Sichuan Electric Power Limited Company,Chengdu,Sichuan 610000,China;Metrology Center,State Grid Jibei Electric Power Limited Company,Beijing 102200,China)

机构地区：[1]中国电力科学研究院有限公司,北京100192 [2]国网四川省电力公司营销服务中心,四川成都610000 [3]国网冀北电力有限公司计量中心,北京102200

出　　处：《计量学报》2025年第1期42-52,共11页Acta Metrologica Sinica

基　　金：国家电网公司科技项目(5700⁃202314248A⁃1⁃1⁃ZN)。

摘　　要：在新型电力系统中,电动汽车充电桩、光伏、储能等直流配用电技术迅速发展,对直流电能计量准确性提出更高要求。准同步算法是解决非周期信号测量的最有效算法之一,且可以通过增加递推阶数,减少频率动态波动对测量准确度的影响。针对直流信号中纹波分量随机时变的动态特征,提出了一种基于频率自适应多阶准同步算法的直流动态电能计量方法。基于有限脉冲响应滤波、微分过零点频率监测方法,快速锁定直流动态信号瞬时频率,根据瞬时频率动态调整准同步算法的平均周期采样点数和采样频率,使得自适应准同步算法的误差约等于每周波采样点数倒数的n(n为准同步迭代次数)次幂,实现直流电能和纹波电能的精准跟踪分离,有效提高了复杂动态工况下的直流电能计量准确性。为了验证该算法的性能,开展了直流动态电能测试验证,测试结果表明,该算法直流分量和有功功率准确度优于0.01%,纹波功率准确度优于0.1%,,可应用于直流动态工况下的电能计量。In the new power system,the rapid development of DC power distribution technology such as electric vehicle charging,photovoltaic,energy storage had put forward higher requirements for the accuracy of DC energy measurement.The quasi-synchronous algorithm was one of the most effective algorithms for solving aperiodic signal measurement,and can reduce the impact of dynamic frequency fluctuations on measurement accuracy by increasing the recursive valence.Aiming at the random time-varying dynamic characteristics of ripple components in DC signals,a new DC dynamic energy measurement method based on frequency adaptive multi-order quasi-synchronization algorithm was proposed.The instantaneous frequency of DC dynamic signal was quickly locked based on finite impulse response filtering and differential zero cross frequency monitoring method,and the average periodic sampling number and sampling frequency of the quasi-synchronous algorithm were dynamically adjusted according to the instantaneous frequency,so that the error of the adaptive quasi-synchronous algorithm was about equal to the n power of the reciprocal of the number of periodic wave samples(n is the quasi-synchronous iteration number).It achieved the accurate tracking and separation of DC energy and ripple energy,and effectively improved the accuracy of DC energy measurement under complex dynamic conditions.In order to verify the performance of the algorithm,a DC dynamic power test was carried out.The test results showed that the accuracy of DC and active power was better than 0.01%,and the accuracy of ripple power was better than 0.1%,which can be applied to the electric energy measurement under DC dynamic conditions.

关 键 词：电学计量 直流电能计量 频率自适应 准同步 动态测量 纹波 

分 类 号：TB97[一般工业技术—计量学]