Fault location method for transmission grids based on time difference of arrival of wide area travelling wave

The Journal of Engineering

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[1] State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, People's Republic of China;Hubei Electric Power Security and High Efficiency Key Laboratory, Huazhong University of Science and Technology, Wuhan, People's Republic of China;

关键词: power transmission faults;    fault location;    power transmission protection;    least squares approximations;    transforms;    wide area travelling-wave-based fault location methods;    indeterminate shortest transmission path;    initial travelling wave;    complex transmission grids;    wide area travelling wave;    fault line;    accurate fault distance;    wide area initial travelling waves;    phase current travelling wave;    pre-determined shortest transmission path;    fault location failure;    travelling wave velocity;    fault location method;    fault condition;   

DOI  :  10.1049/joe.2018.8459

来源: publisher

【 摘 要 】

In allusion to fault location failure on wide area travelling-wave-based fault location methods caused by the indeterminate shortest transmission path of initial travelling wave and the inaccurate travelling wave velocity, this study proposed a novel fault location method for complex transmission grids based on the time difference of arrival of wide area travelling wave. Firstly, the shortest transmission path in the loop network is determined online by using the time difference of arrival of the initial travelling wave measured at both ends of the fault line. Then, the travelling wave velocity and accurate fault distance are calculated by fusing arrival time of wide area initial travelling waves via the least-square estimation. The phase current travelling wave is used for the proposed method, and the S transform is used for detecting the arrival time of phase current travelling wave at the Nyquist frequency. The proposed method avoids the phase-mode transformation and the matching between the actual fault condition and the pre-determined shortest transmission path. The proposed method can also exactly calculate the fault distance without obtaining the travelling wave velocity. The performance of the proposed method is verified by the power systems computer aided design/electro magnetic transients in DC system (PSCAD/EMTDC) simulation results.

【 授权许可】

CC BY