基于改进FFT的合并单元计量性能校验算法研究  

Improved FFT algorithm based merging unit metering performance calibration algorithm

作　　者：杨剑 胡琛[2] 王毓琦 陈子鉴 张仲耀 刘涛 Yang Jian Hu Chen Wang Yuqi Chen Zijian Zhang Zhongyao Liu Tao(Electric Power Research Institute, State Grid Shandong Electric Power Company, Ji＇ nan 250002, China School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China)

机构地区：[1]国网山东省电力公司电力科学研究院,济南250002 [2]华中科技大学电气与电子工程学院,武汉430074

出　　处：《电测与仪表》2017年第15期91-96,共6页Electrical Measurement & Instrumentation

基　　金：华中科技大学强电磁工程与新技术国家重点实验室资助项目(AEET2016ZZ001)

摘　　要：采用常规FFT算法作为合并单元计量性能校验仪的算法时,由于频谱泄漏和栅栏效应,比差和相差不满足0.05级的准确度要求。针对这一问题,在常规FFT的基础上,提出了加Hanning窗的单谱线插值FFT算法和加Blackman窗的双谱线插值FFT算法这两种改进FFT算法,在LabVIEW平台上对这两种算法和常规FFT算法进行仿真比较,仿真结果表明,加Blackman窗的双谱线插值FFT算法的计算准确度最高,更适合用于合并单元计量性能校验。最后在国家高压计量站对合并单元计量性能校验仪进行了校准试验,测试数据表明校验仪满足0.05级准确度要求,从而验证了加Blackman窗的双谱线插值FFT算法的有效性和可行性。Fast Fourier transform （ FFT）, usually suffering from the problem of frequency spectrum leakage and picket fence effect, would not be suitable as the calibration algorithm of merging unit metering characteristics calibration de- vice, so the ratio error and phase displacement of the calibration device utilizing common FFT algorithm cannot satisfy the requirement of 0.05 accuracy class specification. This paper, based on common FFT, proposes two improved FFT algorithms, i.e. , single line interpolation FFI＂ algorithm with Hanning window and two-line interpolation FFT algo- rithm with Blackman window, these two algorithms are compared with the common FFT algorithm on LabVIEW plat- form, the simulation results manifest that the two-line interpolation FFT algorithm with Blackman window has the high- est accuracy for harmonic analysis, which is more suitable for merging unit metering performance calibration. Finally, a prototype calibration device using this algorithm is calibrated at National High Voltage Metering Station, and the re- sults show that the device can meet the specification of 0. 05 accuracy class, confirming the effectiveness and feasibili- ty of the two-line interpolation FFT algorithm with Blackman window.

关 键 词：FFT 合并单元 计量性能 单谱线插值 双谱线插值 

分 类 号：TM933[电气工程—电力电子与电力传动]