基于加窗插值和ESPRIT的电力系统间谐波算法  

Algorithm of Detecting Inter-harmonics in Electric Power System Based on Windowed Interpolation and ESPRIT

作　　者：张绍勇[1] 熊杰锋[1] 

机构地区：[1]河海大学能源与电气学院,江苏南京210098

出　　处：《自动化仪表》2010年第12期15-17,共3页Process Automation Instrumentation

摘　　要：临近谐波或基波的间谐波是导致电压闪变的直接原因。为准确检测间谐波,通过分析加窗插值算法和ESPRIT的局限性,提出基于加窗插值和ESPRIT的间谐波检测方法。通过加窗插值求解各个信号参数,采用频率分析定位临近谐波和间谐波所在频率区间,并采用ESPRIT算法计算时域滤波后的残差分量。仿真对比结果表明,该方法的频率分辨率和精度均优于加窗插值法和传统ESPRIT算法,能有效消除伪谱的影响。The inter-harmonics that closed to harmonics or elementary wave are the direct reason causing voltage flicking.In order to precisely detect the inter-harmonics,through analyzing the limitations of windowed interpolation algorithm and ESPRIT algorithm,the detecting method based on windowed interpolation and ESPRIT is proposed.Each signal parameter is solved by windowed interpolation;and the frequency sections of adjacent harmonic and inter-harmonics components are located by adopting frequency analysis.In addition,the residual components after time domain filtering are calculated with ESPRIT algorithm.The results of simulation and inter-comparison indicate that the resolution and accuracy obtained by this method are better than those from windowed interpolation and traditional ESPRIT algorithm;and the pseudo spectrum can be eliminated.

关 键 词：谐波 间谐波 频率分辨率 加窗插值 ESPRIT算法 频谱泄漏 

分 类 号：TM76[电气工程—电力系统及自动化] TM93