一种高精度快速计算电力谐波参数的方法  

An accurate and fast approach to calculating the power harmonics parameters

作　　者：唐轶[1] 陈奎[1] 谷露[1] 王飞[1] 于琪[1] 

机构地区：[1]中国矿业大学信息与电气工程学院,江苏徐州221008

出　　处：《电力系统保护与控制》2013年第5期43-47,共5页Power System Protection and Control

基　　金：江苏省科技支撑计划(BE2012042)

摘　　要：提出一种电力谐波参数高精度测量的新方法。依据傅立叶变换的时域收缩频域延伸的性质精确计算出电力信号各次谐波的频率,而后通过窗函数插值方法精确计算出电力信号的各次谐波参数。讨论了时域收缩比对测量精度的影响,还分析了截断窗函数对电力谐波估计精度的影响。用仿真试验和模拟测量证明了该算法的有效性。与其他加窗FFT插值校正分析方法相比,所提方法计算耗时上有明显优势,很适合用于DSP数字信号处理器,是一种很实用的算法。This paper proposes a new accurate method of calculating electric power harmonic parameters. Based on the theorem of Fourier transform, of which contraction in time domain causes extend in the frequency domain, the frequency of the electric power is calculated, and then using interpolation in the frequency domain of the windows, the parameters （amplitude and phase） of each harmonic frequency signals can be calculated accurately. In the paper, the effect of the ratio of the contraction in time domain on the measurement accuracy is discussed and the influence of truncation window function on electric power harmonic estimated accuracy is analyzed. The digital simulation and the physical measurement tests show that the proposed method is effective. Comparing with other window FFT interpolation correction analysis methods, it shows great advantage especially in calculation time cost, and so, it is very suitable to be used in the DSP micro-processor. It is a useful calculation method of the electric power harmonics.

关 键 词：FFT 谐波分析 窗函数 频域内插 

分 类 号：TM935[电气工程—电力电子与电力传动]