CAJ | 학술논문

傅里叶变换是电力谐波分析的常用算法，但在非同步采样情况下会出现频谱泄漏，从而影响谐波分析的精度。为抑制频谱泄漏，提出了基于最快衰减余弦窗全相位FFT的电力谐波分析方法。该方法将最大旁瓣衰减速率余弦窗与全相位频谱分析技术相结合，利用前者旁瓣衰减快与后者泄漏抑制能力强的双重优势实现谐波分析，推导了方便实用的谐波幅值校正公式，通过仿真测试，验证了该算法抑制频谱泄漏的能力强、谐波分析的精度高。
부리협변환시전력해파분석적상용산법，단재비동보채양정황하회출현빈보설루，종이영향해파분석적정도。위억제빈보설루，제출료기우최쾌쇠감여현창전상위FFT적전력해파분석방법。해방법장최대방판쇠감속솔여현창여전상위빈보분석기술상결합，이용전자방판쇠감쾌여후자설루억제능력강적쌍중우세실현해파분석，추도료방편실용적해파폭치교정공식，통과방진측시，험증료해산법억제빈보설루적능력강、해파분석적정도고。
Fourier analysis is commonly used in power harmonic analysis. However,spectrum leakage problem exists in this meth-od when the sampling is asynchronous,in this case the detection accuracy decreases seriously. In order to restrain spectrum leakage and enhance the precision,the all-phase FFT based on the maximum side lobe decay speed windows( short for MSLD windows)is pro-posed for power harmonic analysis,which can take the advantage of the MSLD windows′fast side lobe decay speed and the good ability of apFFT to restrain spectrum leakage. The convenient harmonic magnitude analysis formula of proposed algorithm is derived. Matlab simulation verifies that the proposed method has the good ability to restrain spectrum leakage and high precision for harmonic analysis.