CAJ | 학술논문

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.
제출일충전력해파삼수고정도측량적신방법.의거부립협변환적시역수축빈역연신적성질정학계산출전력신호각차해파적빈솔,이후통과창함수삽치방법정학계산출전력신호적각차해파삼수.토론료시역수축비대측량정도적영향,환분석료절단창함수대전력해파고계정도적영향.용방진시험화모의측량증명료해산법적유효성.여기타가창FFT삽치교정분석방법상비,소제방법계산모시상유명현우세,흔괄합용우DSP수자신호처리기,시일충흔실용적산법.
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.