CAJ | 학술논문

提出一种简单的加窗插值快速傅里叶变换方法，用于非同步采样下的电力谐波分析。首先，分析了五项最大旁瓣衰减窗的时域、频域特性；然后，给出基于五项最大旁瓣衰减窗的插值方法，并推导了谐波幅值、初始相位和频率的计算公式；最后，分别用仿真分析、实验测试对所述方法的有效性进行验证。研究表明，五项最大旁瓣衰减窗具有较好的旁瓣特性，能够充分抑制频谱泄漏；基于五项最大旁瓣衰减窗的插值算法，插值公式简单、有解析解、谐波分析精度高、计算量小，易于在嵌入式系统中实现。
제출일충간단적가창삽치쾌속부리협변환방법，용우비동보채양하적전력해파분석。수선，분석료오항최대방판쇠감창적시역、빈역특성；연후，급출기우오항최대방판쇠감창적삽치방법，병추도료해파폭치、초시상위화빈솔적계산공식；최후，분별용방진분석、실험측시대소술방법적유효성진행험증。연구표명，오항최대방판쇠감창구유교호적방판특성，능구충분억제빈보설루；기우오항최대방판쇠감창적삽치산법，삽치공식간단、유해석해、해파분석정도고、계산량소，역우재감입식계통중실현。
A simple windowed interpolation fast Fourier transform (FFT) algorithm is proposed for power harmonic analysis under asynchronous sampling.The time and frequency domain characteristics of 5-term maximum-sidelobe-decay (MSD) window are analyzed first.Then an interpolation approach based on 5-term MSD window FFT is given and the formula of harmonics amplitude,initial phase and frequency are deduced.The approach presented is finally verified by simulations and experimental testing.Results show that the 5-term MSD window has satisfactory sidelobe characteristics for fully suppressing spectral leakage and the 5-term MSD window based interpolation method is easy to realize in embedded systems for its simple interpolated correction formula,closed form expression,highly accurate power harmonic analysis,and low computational burden.