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《Automation of Electric Power Systems》 2000-05
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NEW RECURSIVE DFT FOR COMPUTER RELAY

Zhang Lihua,Xu Wenli,Chang Cheng,F eng Dawei Tsinghua University,Beijing100084,China  
To reduce computational complexity of DFT,a recursive formula of DFT was put forward according to a natural idea of adding the latestdata item and deleting the firstone,butit can notbe used conveniently undersome situations.In this paper a new recursive DFT is proposed based on sum-and-difference formula of trigonometrical function and solution of linear equations.Its computation work is nearly the same as that of traditional recursive DFT,but it can solve many problems effectively which can' t be solved easily by traditional recursive DFT,such as algorithms for overcoming attenuation direct- current component part existing in power system.The new recursive DFT has a vast range of prospects.
【Fund】: 河南省“九五”科技攻关项目! ( 96 112 0 12 5 )
【CateGory Index】: TM769
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