【摘要】：針對零模波速隨頻率變化大的問題,提出利用零模行波波速特性求取波速的方法,并將其應(yīng)用到配電網(wǎng)單相接地故障測距中。將行波信號分解到小波各個頻帶內(nèi),不同的頻帶信號會產(chǎn)生不同的衰減和相移,但各個頻帶上初始行波波速都會大于第1次反射波波速。利用零模行波波速的這種特性,選取初始行波波速與第1次反射波波速最相近的特征頻帶。在該頻帶下利用線模行波和零模行波波頭一一對應(yīng)關(guān)系求取第一次反射波波速,將其代入基于零模和線模波速差的測距公式,得到精確的故障距離。利用PSCAD/EMTDC搭建仿真模型,對不同的故障情況進行仿真,結(jié)果證實了所提方法的有效性和準確性。
[Abstract]:Aiming at the problem that the zero-mode wave velocity varies with the frequency, a method to calculate the wave velocity by using the zero-mode traveling wave velocity characteristic is put forward, and it is applied to the single-phase grounding fault location of distribution network. When the traveling wave signal is decomposed into each frequency band of wavelet, the different frequency band signal will produce different attenuation and phase shift, but the initial traveling wave velocity in each frequency band will be larger than the first reflected wave velocity. By using the characteristic of zero mode traveling wave velocity, the characteristic frequency band of the initial traveling wave velocity and the first reflected wave velocity is chosen. In this frequency band, the first reflected wave velocity is obtained by using the one-to-one correspondence relationship between the linear mode traveling wave and the zero mode traveling wave head, and the accurate fault distance is obtained by replacing the first reflected wave velocity with the ranging formula based on the zero mode and line mode wave velocity difference. The simulation model is built with PSCAD/EMTDC, and the simulation results show that the proposed method is effective and accurate.
【作者單位】： 東北大學(xué)信息科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(61433004) 中央高�；究蒲袠I(yè)務(wù)費項目(N130604001)~~
【分類號】：TM727

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