中国电机工程学报2011，Vol.31Issue(25)：104-111,8.
±800kV直流输电线路故障定位的单端电压自然频率方法
Fault Location for ±800 kV HVDC Transmission Lines Using Natural Frequency of Single Terminal Voltage Data
摘要
Abstract
The spectra of fault induced traveling wave is related to the fault distance, therefore the spectra of fault induced traveling wave can be utilized for fault location. A boundary existing in the DC system consisting of DC filter and smoothing reactor is almost the open-circuit to the high frequency signals and the reflection coefficient of the boundary is similar to one. Consequently, the wave measured at relay is a periodic signal. However, the polarity of traveling wave will be changed while hitting the DC filter which is a capacitive unit for the low frequency part of traveling wave, thus the radians of the low frequency signals and the nature frequency in frequency domain of the traveling wave will be altered. In addition, line mode and zero-mode voltage wave cross each other at the point of fault which causes the natural frequency ＂aliasing＂. Artificial neural network （ANN） that is a good tool for non-linear data modeling and non-linear function curve-fitting is selected to solve the aforementioned problems. The fundamental frequency and the 2nd harmonic are chosen as the inputs for training and testing the neural network for fault location in the UHVDC system. A variety of transmission line fault situation are simulated based on the PSCAD, and this proposed method using ANN and nature frequency shows satisfactory performance.关键词
特高压直流输电/自然频率/实体物理边界/故障测距/人工神经网络Key words
UHVDC/natural frequency/entity physicalboundary/fault loacation/artificial neural network （ANN）分类
信息技术与安全科学引用本文复制引用
束洪春,田鑫萃,张广斌,刘可真,孙士云..±800kV直流输电线路故障定位的单端电压自然频率方法[J].中国电机工程学报,2011,31(25):104-111,8.基金项目
国家自然科学基金项目（50977039,50847043,90610024,50467002,50347026) （）
云南省科技攻关项目（2003GG10,2005F0005Z). （）
