CAJ | 학술논문

针对现有对于多端输电线路故障定位方法研究的不足，提出了一种基于暂态行波的多端输电网故障定位新方法。对各检测端母线电压线模分量应用S变换，从中提取出奈奎斯特频率分量单频率行波的幅-时变化特性，幅值最大值对应的时刻即为行波波首的到达时刻。采用该频率分量对应的行波波速作为计算用波速，解决了波速不确定的问题。将多端输电网看作含有一条干路和若干支路的集合，形成从支路到干路逐一排除的故障定段方案。最后，依定段结果与双端测距原理计算出故障点准确位置。仿真分析结果表明，定位精确、可靠，算法抗噪性及适应性强。
침대현유대우다단수전선로고장정위방법연구적불족，제출료일충기우잠태행파적다단수전망고장정위신방법。대각검측단모선전압선모분량응용S변환，종중제취출내규사특빈솔분량단빈솔행파적폭-시변화특성，폭치최대치대응적시각즉위행파파수적도체시각。채용해빈솔분량대응적행파파속작위계산용파속，해결료파속불학정적문제。장다단수전망간작함유일조간로화약간지로적집합，형성종지로도간로축일배제적고장정단방안。최후，의정단결과여쌍단측거원리계산출고장점준학위치。방진분석결과표명，정위정학、가고，산법항조성급괄응성강。
To improve the existing fault location methods in multi-terminal transmission network, a novel method based on transient traveling wave is presented. S-transform is applied to the aerial modal components of synchronized measured voltages at all the terminals to extract the Nyquist frequency components of transient traveling waves. The moment corresponding to the maximum component in the Nyquist frequency component is exactly the initial traveling wave arrival time. Using the wave velocity corresponding to the Nyquist frequency component as the calculation wave velocity, the problem of the wave speed uncertainty is solved. According to the number of T nodes passed through by each line, all the lines can be classified into branch section and artery section. Based on double-terminal traveling wave theory and the result of the indentification theory for fault section, the final fault distance can be achieved. The simulation results prove good performance of the proposed method.