摘要
首先叙述了频谱泄漏的概念 ,分析了造成频谱泄漏的原因 ,并总结了国内外提出的各种减少频谱泄漏的方法。提出一种等角度间隔的自适应软件同步采样算法 ,该算法在信号频谱分析过程中利用相量理论实现了采样频率的自适应调整。仿真结果表明 ,该算法不仅大大减少了频谱泄漏 ,提高了谐波分析的精度 ,且增加的计算量有限 ,完全能够保证分析的实时性 。
The paper firstly introduces the concept of spectrum leakage and the reason for spectrum leakage.Then all the methods proposed to reduce the spectrum leakage are sum marized.When the sampling frequency is invariable,the fluctuation of the signal frequency will make the measurementof the harm onics less than its real value,at the same tim e the non- existent harm onics will be analyzed.Further,a new adaptive algorithm of equal angle- interval software synchronous sam pling is proposed. With the vector theory,the adaptive regulation of the sam pling frequency in software can be carried out through the harmonic analysis.Sim ulation results show the new algorithm notonly greatly reduces the spectrum leakage and improves the accuracy of harm onic analysis,but ensures its real time running with the powerful DSP,thus the restriction of the speed of DFT is resolved.Moreover,the algorithm will have great application potentials in the fields based on AC m easurem ent.
出处
《电力系统自动化》
EI
CSCD
北大核心
2002年第7期55-58,共4页
Automation of Electric Power Systems
