基于多点电流测量的输电线路故障定位方法研究
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摘要
输电线路故障定位对于帮助线路维护人员寻找故障点和线路的及时恢复具有重要意义。与传统基于工频量的故障分析法相比,行波法在定位精度上具有明显优势。然而,在实际中行波法还存在一些问题没有很好地解决,有时会严重影响其定位精度和可靠性。输电线路在线监测技术和通信技术的发展为这些问题的解决提供了条件,在此基础上本文从影响行波法定位精度的主要因素入手,对行波波头检测方法、波速测定方法和多测点行波故障定位方法进行研究,同时还对具有特殊网络结构的多端线路精确故障定位以及故障选相问题进行研究。
论文提出了一种基于快速本征模态分解(Fast Intrinsic Mode Decomposition, FIMD)和Teager能量算子(Teager Energy Operator, TEO)的行波波头检测方法。首先对各测点电流行波线模分量进行FIMD分解,然后利用TEO计算所得首个本征模态分量的瞬时Teager能量,通过首个能量突变点确定出故障初始行波的到达时刻。该方法能解决希尔伯特-黄变换存在的问题。
论文提出了一种基于三点电流测量的输电线路行波故障定位新方法。在线路中途增设一罗氏电流互感器测量故障电流,根据分相电流相位差动原理判断出故障点所在的线路段,再利用非故障段线路长度和故障行波到达其两端测点的时间差之比在线计算出故障行波波速,进而准确定位出故障点。
论文提出了一种基于多点电流测量的输电线路行波故障定位新方法。首先通过多点电流相位比较判断出故障区段,再根据故障区段选择其两侧的电流测点,并使其尽量处于所选测点的中部,然后利用前述波速测定方法在线测定出波速,最后根据双端行波法定位出故障点。
论文提出了一种基于双端行波定位原理的多端输电线路故障定位新方法。利用双端行波定位原理和故障初始行波到达各端的时刻形成所提故障支路判定矩阵,并针对不同位置故障的情况分别提出了故障支路判定原理。选择能够经过故障点形成双端支路最多的母线作为初始端,将所计算出双端支路故障距离的均值作为最终故障距离。
论文提出了一种基于电流故障分量高阶多分辨率奇异熵的输电线路故障选相方法。将电流故障分量小波变换系数的高阶累积量作为元素形成状态矩阵,并根据计算所得奇异熵值判断出故障类型。
The fault location for transmission lines is of great significance to help power line maintenance crews search for fault point and restore the lines'transmission service without too much delay. Being compared with traditional fault location methods based on fundamental frequency components, the traveling wave methods have higher accuracy. However, some problems existed in the traveling wave methods are still not well solved in practice and they may seriously affect the fault location accuracy and reliability sometimes. The development of transmission line on-line monitoring technology and communication technology may provide conditions for solving these problems. On this basis, starting with the main factors that influence the fault location accuracy of traveling wave methods, the traveling wave detection method, the wave velocity determination method and the fault location method based on traveling waves of multiple measurements are studied in this paper. At the same time, the accurate fault location for multi-terminal transmission lines which have a special network structure and the fault phase selection are also studied.
A traveling wave detection method based on Fast Intrinsic Mode Decomposition (FIMD) and Teager Energy Operator (TEO) is proposed in this paper. The aerial mode component of each measured current wave is decomposed by FIMD, and then the instantaneous teager energy of the obtained first intrinsic mode function is calculated by TEO. According to the first sudden arising of the calculated teager energy, the arrival time of the initial fault traveling wave is determined. The problems of Hilbert-Huang Transform for traveling wave detection can be solved by the proposed method.
A novel fault location scheme for transmission lines based on traveling waves of three current measurements is proposed in this paper. A rogowski coil current transformer is used to measure the fault current in the midway of a transmission line and the faulted line section is identified through comparing the phase angles of the measured currents at two ends of a line section. The wave velocity is calculated by the ratio of the length of the non-faulted line section to the time that the wave travels through this line section, and then the fault point is located accurately.
A novel fault location scheme for transmission lines based on traveling waves of multiple current measurements is proposed in this paper. The faulted line section is identified through comparing the phase angles of multiple current measurements. Then the current measurements used for fault location are selected according to the identified faulted line section and the principle is to make the faulted line section be in the middle of the selected current measurements as far as possible. The wave velocity of the fault current wave is calculated by the aforementioned wave velocity determination method, and finally the fault point is located according to the two-ended traveling wave method.
A novel fault location scheme for multi-terminal transmission lines based on the two-ended traveling wave method is proposed in this paper. According to the two-ended traveling wave fault location method and the time that the initial fault traveling wave arrives at each terminal, the proposed fault section identification matrix is formed. Then, the fault section identification rules are proposed respectively for different fault conditions. The terminal that can form the most two-ended lines through the fault point is selected as the local terminal, and then the fault point is located by averaging the fault distances calculated with all the two-ended lines.
A fault phase selection method based on high order muti-resolution singular entropy is proposed in this paper. The high-order cumulant calculated with wavelet coefficients of the fault current components are used to form state matrix, and then the fault types of a transmission line are determined by the entropy of the obtained singular values from the state matrix.
论文提出了一种基于快速本征模态分解(Fast Intrinsic Mode Decomposition, FIMD)和Teager能量算子(Teager Energy Operator, TEO)的行波波头检测方法。首先对各测点电流行波线模分量进行FIMD分解,然后利用TEO计算所得首个本征模态分量的瞬时Teager能量,通过首个能量突变点确定出故障初始行波的到达时刻。该方法能解决希尔伯特-黄变换存在的问题。
论文提出了一种基于三点电流测量的输电线路行波故障定位新方法。在线路中途增设一罗氏电流互感器测量故障电流,根据分相电流相位差动原理判断出故障点所在的线路段,再利用非故障段线路长度和故障行波到达其两端测点的时间差之比在线计算出故障行波波速,进而准确定位出故障点。
论文提出了一种基于多点电流测量的输电线路行波故障定位新方法。首先通过多点电流相位比较判断出故障区段,再根据故障区段选择其两侧的电流测点,并使其尽量处于所选测点的中部,然后利用前述波速测定方法在线测定出波速,最后根据双端行波法定位出故障点。
论文提出了一种基于双端行波定位原理的多端输电线路故障定位新方法。利用双端行波定位原理和故障初始行波到达各端的时刻形成所提故障支路判定矩阵,并针对不同位置故障的情况分别提出了故障支路判定原理。选择能够经过故障点形成双端支路最多的母线作为初始端,将所计算出双端支路故障距离的均值作为最终故障距离。
论文提出了一种基于电流故障分量高阶多分辨率奇异熵的输电线路故障选相方法。将电流故障分量小波变换系数的高阶累积量作为元素形成状态矩阵,并根据计算所得奇异熵值判断出故障类型。
The fault location for transmission lines is of great significance to help power line maintenance crews search for fault point and restore the lines'transmission service without too much delay. Being compared with traditional fault location methods based on fundamental frequency components, the traveling wave methods have higher accuracy. However, some problems existed in the traveling wave methods are still not well solved in practice and they may seriously affect the fault location accuracy and reliability sometimes. The development of transmission line on-line monitoring technology and communication technology may provide conditions for solving these problems. On this basis, starting with the main factors that influence the fault location accuracy of traveling wave methods, the traveling wave detection method, the wave velocity determination method and the fault location method based on traveling waves of multiple measurements are studied in this paper. At the same time, the accurate fault location for multi-terminal transmission lines which have a special network structure and the fault phase selection are also studied.
A traveling wave detection method based on Fast Intrinsic Mode Decomposition (FIMD) and Teager Energy Operator (TEO) is proposed in this paper. The aerial mode component of each measured current wave is decomposed by FIMD, and then the instantaneous teager energy of the obtained first intrinsic mode function is calculated by TEO. According to the first sudden arising of the calculated teager energy, the arrival time of the initial fault traveling wave is determined. The problems of Hilbert-Huang Transform for traveling wave detection can be solved by the proposed method.
A novel fault location scheme for transmission lines based on traveling waves of three current measurements is proposed in this paper. A rogowski coil current transformer is used to measure the fault current in the midway of a transmission line and the faulted line section is identified through comparing the phase angles of the measured currents at two ends of a line section. The wave velocity is calculated by the ratio of the length of the non-faulted line section to the time that the wave travels through this line section, and then the fault point is located accurately.
A novel fault location scheme for transmission lines based on traveling waves of multiple current measurements is proposed in this paper. The faulted line section is identified through comparing the phase angles of multiple current measurements. Then the current measurements used for fault location are selected according to the identified faulted line section and the principle is to make the faulted line section be in the middle of the selected current measurements as far as possible. The wave velocity of the fault current wave is calculated by the aforementioned wave velocity determination method, and finally the fault point is located according to the two-ended traveling wave method.
A novel fault location scheme for multi-terminal transmission lines based on the two-ended traveling wave method is proposed in this paper. According to the two-ended traveling wave fault location method and the time that the initial fault traveling wave arrives at each terminal, the proposed fault section identification matrix is formed. Then, the fault section identification rules are proposed respectively for different fault conditions. The terminal that can form the most two-ended lines through the fault point is selected as the local terminal, and then the fault point is located by averaging the fault distances calculated with all the two-ended lines.
A fault phase selection method based on high order muti-resolution singular entropy is proposed in this paper. The high-order cumulant calculated with wavelet coefficients of the fault current components are used to form state matrix, and then the fault types of a transmission line are determined by the entropy of the obtained singular values from the state matrix.
引文
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