电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
POWER SYSTM PROTECTION AND CONTROL
2015年
11期
27-32
,共6页
电力系统谐波%8项余弦窗%插值FFT算法%频谱泄漏%三次样条函数
電力繫統諧波%8項餘絃窗%插值FFT算法%頻譜洩漏%三次樣條函數
전력계통해파%8항여현창%삽치FFT산법%빈보설루%삼차양조함수
power system harmonics%8-term cosine window%interpolation FFT algorithm%spectrum leakage%cubic spline function
采用加8项余弦窗函数插值FFT算法的谐波分析方法可以进一步提高电力系统谐波的测量精度。为了引入加8项余弦窗函数的插值FFT算法,首先比较分析了5到8项余弦窗的频谱特性,然后推导了8项余弦窗函数插值FFT算法的计算公式,并采用三次样条插值函数计算频率修正系数和复振幅的修正系数,减少了计算量。仿真计算结果表明,相比其他加余弦窗插值FFT算法,加8项余弦窗函数插值FFT算法具有更高的精度,从而验证了该算法的有效性与实用性。
採用加8項餘絃窗函數插值FFT算法的諧波分析方法可以進一步提高電力繫統諧波的測量精度。為瞭引入加8項餘絃窗函數的插值FFT算法,首先比較分析瞭5到8項餘絃窗的頻譜特性,然後推導瞭8項餘絃窗函數插值FFT算法的計算公式,併採用三次樣條插值函數計算頻率脩正繫數和複振幅的脩正繫數,減少瞭計算量。倣真計算結果錶明,相比其他加餘絃窗插值FFT算法,加8項餘絃窗函數插值FFT算法具有更高的精度,從而驗證瞭該算法的有效性與實用性。
채용가8항여현창함수삽치FFT산법적해파분석방법가이진일보제고전력계통해파적측량정도。위료인입가8항여현창함수적삽치FFT산법,수선비교분석료5도8항여현창적빈보특성,연후추도료8항여현창함수삽치FFT산법적계산공식,병채용삼차양조삽치함수계산빈솔수정계수화복진폭적수정계수,감소료계산량。방진계산결과표명,상비기타가여현창삽치FFT산법,가8항여현창함수삽치FFT산법구유경고적정도,종이험증료해산법적유효성여실용성。
An approach for power harmonic analysis based on 8-term cosine window interpolation FFT algorithm can further improve the precision of harmonics measurement, and the paper provides a new interpolation FFT algorithm based on 8-term cosine window. It firstly analyzes the spectrum characteristics of 5 to 8-term cosine window and then deduces the interpolation algorithm on 8-term cosine window in detail, the cubic spline function is adopted to calculate the frequency and the harmonic amplitude modification coefficient, and calculating burden is reduced. The results show that, compared to other cosine window interpolation FFT algorithm, the interpolation FFT algorithm based on 8-term cosine window has higher accuracy, and the results verify the effectiveness and practicality of the proposed algorithm.