小波變換超高壓輸電線路雷電干擾識(shí)別判據(jù)研究
馬 杰
摘 要：超高壓輸電線路的繼電保護(hù)裝置不可避免地會(huì)受到各種高頻信號(hào)的干擾，其中雷電干擾是最主要的干擾因素，可能會(huì)造成線路保護(hù)誤動(dòng)作。針對雷電干擾問題，對不同情況下的暫態(tài)電流模分量進(jìn)行信號(hào)能量分布和波形分析，找出差異，提出區(qū)分輸電線路上雷電干擾、故障性雷擊及普通短路故障的判據(jù)，最終達(dá)到對雷電干擾的識(shí)別從而避免誤動(dòng)作。通過大量的Matlab仿真計(jì)算驗(yàn)證該方法的正確性、有效性。
關(guān)鍵詞：超高壓輸電線路；雷電干擾；頻譜分析；小波變換
中圖分類號(hào)：TN911.7；TM723；P427.32+1；TN973.3 文獻(xiàn)標(biāo)志碼：A 文章編號(hào)：1674-5124（2013）05-0034-05
On the wavelet based identification of lightning interference for transmission lines
MA Jie， LIU Lu-lu， YAO Yong
（Kaifeng Administration of Electric Power Supply of Electric Power of Henan Kaifeng，
Kaifeng 475004，China）
Abstract: Protective relaying equipment play a significant role in transmission lines and suffers from varies of high frequency interference. Lightning interference is one of the major interference factors， which causes false operation during protection process. According to the lightning interference problem， this paper analyzes the energy distribution and wave of current transient components in different cases to find out the differences， and then proposes the criterion to distinguish the lightning interference， transmission induction lightning and short-cut fault for transmission lines. Finally， through the proposed method， lightning interference can be identified to eliminate false operation during protection process. Simulation results in Matlab verify the validity and effectiveness of our proposed method.
Key words: transmission line； lightning interference； spectrum analysis； wavelet transform
