【摘要】 鉴于小电流接地系统模量行波选线判据繁琐、相电流行波选线不能确定故障相以及实小波变换存在平移敏感性、缺乏相位信息等缺点,以初始行波选线研究结果为基础,推导β,γ模量比值关系式并且以双树复小波变换为工具,刻划初始行波特征,提出了基于双树复小波的行波选线选相法。该方法利用分解得到的行波模极大值幅值与相位判断故障,算法明了,适用面广,同时克服了实小波变换的缺点,使选线选相结果更准确可靠。通过Matlab仿真软件用大量仿真算例验证了该方法的有效性。更多还原

【Abstract】 In view of the shortcomings like fault line selection based on β、γ modulus of distribution system with non-effectively neutral grounded(NNG) is cumbersome,fault line selection based on phase current traveling wave can not select fault phase,and DWT lacks of shift invariance and phase information,based on the study result of current initial traveling wave,this paper deduces the ratio relationship of β、γ modulus,uses dual-tree complex wavelet transform as a tool to characterize the initial traveling wave characteristics,and presents the fault line and phase selection based on traveling wave and dual-tree complex wavelet.The algorithm can analyze faults by using amplitude and phase of modulus maxima of traveling wave which are decomposed by DT CWT.It is clear and can be applied widely.It also overcomes the shortcomings of DWT and makes the results of the fault line and phase selection more accurate and reliable.Finally,a large number of simulation examples demonstrate the effectiveness of the method with Matlab.更多还原