同杆四回线参数自适应双端故障测距频域算法

A Parameter Adaptive Fault Location with Two-terminal Data for Four-parallel Transmission Lines on the Same Tower

为了消除同杆四回线相间和线间耦合问题及线路参数不确定性对同杆四回线故障测距的影响,提出了适应于同杆四回线故障测距的模变换分析方法。对同杆四回线的电压和电流信息进行解耦处理,提取不受系统阻抗影响的环流模分量,构建基于环流模分量的同杆四回线频域故障测距观测方程;为解决线路参数多变性影响,利用故障前冗余电压和电流信息,构建线路参数自适应的频域观测方程,以获得准确的线路环流模分量的基频参数,从而提出了一种同杆四回线参数自适应的双端故障测距频域算法。利用ATP/EMTP电磁暂态仿真软件,构建同杆四回线JMarti仿真模型,通过全面的仿真分析验证,证明所提出的测距方法能消除同杆四回线相间和线间耦合问题以及线路参数的不确定性影响,具有较高的故障测距精度。

In order to eliminate the effects of interphases and interlines coupling as well as parameter uncertainties on fault locations of four-parallel transmission lines on the same tower,a novel phase-mode transformation analysis method for four-parallel transmission lines on the same tower is proposed. Base on this phase-mode transformation method,the circulation mode components are extracted by decoupling the voltage and current information and established the fault location observation equation of four-parallel transmission lines on the same tower in frequency domain. In order to reduce the effects of the multivariate line parameters,the transmission-line-parameter adaptive frequency domain equations are constructed by using the redundant information of the normal voltage and current to obtain the precise transmission line fundamental frequency parameters of circulation components. Based on this approach,a novel parameter adaptive fault location algorithm based on two terminals data of four-parallel transmission lines on the same tower is proposed. Using the ATP-EMTP software,the four-parallel JMarti transmission lines model is constructed for simulation purpose. The simulation results demonstrated that the proposed fault location scheme is capable of eliminating the effects of transmission line coupling and parameter uncertainty. It is also able to achieve high accuracy level in obtaining the fault locations.