本文關(guān)鍵詞：基于衰減振蕩信號特征參數(shù)和偽阻抗的電路參數(shù)計(jì)算方法　出處：《物理學(xué)報(bào)》2014年09期 　論文類型：期刊論文

  更多相關(guān)文章： 電路參數(shù) 衰減振蕩信號 特征參數(shù) 偽阻抗

【摘要】：本文研究了基于暫態(tài)信號中衰減振蕩信號的電路參數(shù)計(jì)算理論和方法.在電力系統(tǒng)線路發(fā)生故障時,通過計(jì)算暫態(tài)信號流通路徑電路參數(shù)可確定故障位置、推斷故障原因,而衰減振蕩信號作為暫態(tài)信號主要成分,因此分析基于衰減振蕩信號的電路參數(shù)計(jì)算在電力系統(tǒng)故障定位中有重要理論價值和實(shí)際工程意義.結(jié)合R-L電路和R-C電路,首先推導(dǎo)了時域衰減振蕩電壓、電流信號特征參數(shù)與各元件參數(shù)以及電路參數(shù)間定量關(guān)系;并分析了電路在衰減振蕩信號下阻抗特性,結(jié)合穩(wěn)態(tài)正弦分量阻抗概念,將電路流經(jīng)衰減振蕩信號時的阻抗特性定義為偽阻抗,并確定了偽阻抗與電路參數(shù)和信號特征參數(shù)間的關(guān)系;同時分析了串并聯(lián)條件下偽阻抗與元件參數(shù)關(guān)系.以此為基礎(chǔ)分別提出了基于信號特征參數(shù)和基于偽阻抗的電路參數(shù)計(jì)算理論,結(jié)合現(xiàn)有衰減振蕩信號特征提取方法,提出具體計(jì)算方法,為基于衰減振蕩信號的電路參數(shù)計(jì)算理論發(fā)展以及實(shí)際工程應(yīng)用奠定了重要基礎(chǔ).通過MATLAB模擬產(chǎn)生故障信號對所提理論和方法進(jìn)行驗(yàn)證,結(jié)果證明了所提理論和方法的正確性和準(zhǔn)確性,并以實(shí)際電網(wǎng)故障信息為基礎(chǔ),基于PSCAD/EMTDC建立實(shí)際配網(wǎng)模型并對實(shí)際單相接地故障進(jìn)行重現(xiàn),對配網(wǎng)單相接地故障進(jìn)行定位分析,結(jié)果證明了方法的可行性.
[Abstract]:In this paper, the theory and method of circuit parameter calculation based on attenuated oscillation signal in transient signal are studied. In the case of power system line failure, the fault location can be determined by calculating the circuit parameters of transient signal flow path. The reason of the fault is inferred, and the attenuation oscillation signal is the main component of the transient signal. Therefore, it has important theoretical value and practical engineering significance to analyze the calculation of circuit parameters based on attenuated oscillation signal in power system fault location, combining R-L circuit and R-C circuit. Firstly, the quantitative relationship between the characteristic parameters of the time-domain attenuation oscillation voltage, current signal and the parameters of each component and the circuit parameters is deduced. The impedance characteristic of the circuit under the attenuated oscillation signal is analyzed, and the impedance characteristic of the circuit flowing through the attenuated oscillation signal is defined as pseudo impedance in combination with the concept of steady state sinusoidal component impedance. The relationship between pseudo-impedance and circuit parameters and signal characteristic parameters is determined. At the same time, the relationship between pseudo-impedance and component parameters under series-parallel condition is analyzed. Based on this, the calculation theory of circuit parameters based on signal characteristic parameters and pseudo-impedance is proposed respectively. Combined with the existing attenuation oscillation signal feature extraction method, a specific calculation method is proposed. It lays an important foundation for the development of circuit parameter calculation theory based on attenuated oscillation signal and practical engineering application. The proposed theory and method are verified by generating fault signal by MATLAB simulation. The results show that the proposed theory and method are correct and accurate, and based on the actual fault information. The actual distribution network model is established based on PSCAD/EMTDC, and the actual single-phase grounding fault is reproduced, and the location of single-phase grounding fault in distribution network is analyzed. The results show that the method is feasible.
【作者單位】： 四川大學(xué)電氣信息學(xué)院;國家電網(wǎng)樂山電力股份有限公司;國家電網(wǎng)宜賓供電公司;國家電網(wǎng)綿陽供電公司;國家電網(wǎng)資陽供電公司;
【分類號】：TM711.2
【正文快照】： 1引言在電力系統(tǒng)中,當(dāng)線路發(fā)生接地故障時,系統(tǒng)將與大地構(gòu)成新的流通回路,該流通回路電路參數(shù)直接反應(yīng)了故障距離和故障電阻等信息,利用變電站端電壓、電流信號測量信號計(jì)算回路參數(shù)即可確定故障位置并推斷故障原因,該思路已在繼電保護(hù)和故障定位中得到了大量應(yīng)用[1-5].傳統(tǒng)方

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