CAJ | 학술논문

电网中谐波信号的逐渐增加，导致电能质量越来越差，要想将谐波的危害降到最小，需要对电网中各次谐波进行精确测量。本文在传统的FFT（快速傅里叶变换）算法的基础上，提出了加4次Blackman自卷积窗的方法减小频谱泄露，并通过插值算法计算得到4次Blackman自卷积窗的幅值、频率和相位修正公式，以得出各次谐波的近似值。最后将该计算结果与加其它余弦自卷积窗的修正结果进行比较，得出在电网谐波参数求解过程中，加4次Blackman自卷积窗插值修正算法不仅有较高的精度，总误差率明显较小，而且算法简单，易于嵌入式系统实现。
전망중해파신호적축점증가，도치전능질량월래월차，요상장해파적위해강도최소，수요대전망중각차해파진행정학측량。본문재전통적FFT（쾌속부리협변환）산법적기출상，제출료가4차Blackman자권적창적방법감소빈보설로，병통과삽치산법계산득도4차Blackman자권적창적폭치、빈솔화상위수정공식，이득출각차해파적근사치。최후장해계산결과여가기타여현자권적창적수정결과진행비교，득출재전망해파삼수구해과정중，가4차Blackman자권적창삽치수정산법불부유교고적정도，총오차솔명현교소，이차산법간단，역우감입식계통실현。
With the extensive use of nonlinear electronic components, the increase of the harmonic signals in power grid leads to the worse power quality. In order to reduce the harm of harmonic to the minimum, the accurate measurement of harmonics is needed. Therefore, this paper proposes the plus 4 Blackman self-convolution window to reduce spectrum leakage based on the traditional FFT(Fast Fourier Transformation) algorithm, which gets 4 times of Blackman self-convolution window amplitude, frequency and phase correction formula with the interpolation algorithm. Comparing the results with the other cosine self-convolution window correction, the solving process of the harmonic parameters is elicited. The plus 4 Blackman self-convolution window interpolation algorithm has not only the high precision, but also has a significantly smaller total error rate than the other algorithms. Moreover, with the simple algorithm, it is easy to be implemented in the embedded system.