计及较大频率偏移的谐波相量测量算法  

Harmonic phasor estimation algorithm considering large frequency deviations

作　　者：陈克绪 陈垒[2] 胡涛 赵东芳 赵伟[2] 黄松岭[2] Chen Kexu;Chen Lei;Hu Tao;Zhao Dongfang;Zhao Wei;Huang Songling(Electric Power Research Institute of State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330096,China;Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]国网江西省电力有限公司电力科学研究院,南昌330096 [2]清华大学电机系,北京100084

出　　处：《电测与仪表》2020年第24期22-28,共7页Electrical Measurement & Instrumentation

基　　金：国网江西省电力有限公司科技项目(521820180014)。

摘　　要：近年来,电力电子化导致供电系统的电能质量明显恶化,次同步谐振问题时有发生。实现动态谐波相量的广域同步测量,是监测供电系统谐波含量及其动态变化水平,解决上述问题的关键手段之一。然而,频率偏移较大时,现有的谐波相量测量算法难以同时满足准确度高和计算量小的工程应用要求。文章基于香农采样定理对动态谐波相量进行建模,增加频率自适应调节,按信号实际频率确定并选取谐波相量测量滤波器,同时根据对模型误差的理论分析,设计各谐波相量测量滤波器的频带宽度,从而提高谐波相量测量的准确度。计算量统计分析和仿真实验结果表明,所提出的谐波相量测量算法不仅计算量小,而且准确度明显高于现有的泰勒傅里叶变换算法,十分适合于工程应用。Recently,the power quality of power supply system deteriorates obviously due to the power electronics,and the sub-synchronous resonance problem occurs frequently.The realization of wide-area synchronous measurement of dynamic harmonic phasor is one of the key measures to monitor harmonic content and dynamic change level of power supply system.However,when there is a large frequency deviation,it is hard to achieve high accuracy and low computation time simultaneously.This paper models dynamic harmonic phasors based on the Shannon sampling theorem and increases frequency adaptive adjustment.The harmonic phasor estimation filter is determined and adaptively selected according to the actual frequency of signals.Meanwhile,the frequency band associated with each harmonic phasor estimation filter is obtained after a theoretical error analysis;as a result,the accuracy of harmonic phasor measurement is improved.Computation analysis and simulation tests show that the proposed method has low computation time,and is much more accurate than the Taylor Fourier transform,which makes it very suitable for engineering application.

关 键 词：谐波相量 频率偏移 广域监测 有限冲激响应滤波器 自适应算法 

分 类 号：TM933[电气工程—电力电子与电力传动]