【摘要】：非整周期采樣條件下,應用FFT算法對信號進行分析時,會產生頻譜泄漏,從而使有功電能的計量產生誤差。在明確基波有功電能和諧波有功電能的定義,并證明負載所消耗的總有功電能與電壓電流信號的頻譜之間存在一定關系基礎上,提出一種基于諧波子組加窗FFT的有功電能計量新算法。類似于IEC標準中諧波子組的分組方法,對加窗信號的頻譜進行分組,并基于加窗前后信號總有功電能保持不變而得到電能恢復系數(shù);同時,應用諧波子組內譜線的參數(shù)信息測算出基波有功電能和諧波有功電能值。數(shù)值仿真分析和實際應用驗證發(fā)現(xiàn),若該新算法配合以Hanning窗進行信號處理,其在測算基波有功電能和諧波有功電能時均具有較高的準確度。
[Abstract]:Under the condition of non-integer periodic sampling, the spectrum leakage will occur when the signal is analyzed by the FFT algorithm, thus the measurement error of the active power can be caused. Based on the definition of fundamental active power and harmonic active power, it is proved that there is a certain relationship between the total active power consumed by load and the spectrum of voltage and current signal. A new algorithm for active energy measurement based on harmonic subgroup windowed FFT is proposed. Similar to the grouping method of harmonic subgroup in IEC standard, the spectrum of windowed signal is grouped, and the power recovery coefficient is obtained based on the total active power of the signal before and after windowed. At the same time, the fundamental active power and harmonic active power are calculated by using the parameter information of the spectrum line in the harmonic subgroup. Numerical simulation and practical application show that if the new algorithm is combined with Hanning window for signal processing, it has a high accuracy in measuring the fundamental and harmonic active power.
【作者單位】： 清華大學電力系統(tǒng)及發(fā)電設備控制和仿真國家重點實驗室;
【基金】：國家高技術研究發(fā)展計劃(863計劃)(2015AA050404)項目資助
【分類號】：TM933.4

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