Abstract
Timely and accurate fault location for a 35-kVhigh-reliability distribution network is one of the key technologies to improve the safety and efficiency of distribution network operations. A novel fault location method of 35-kV high-reliability distribution network is proposed in this paper. First, the distributed multipoint fault location model is established based on the power structure of a 35-kV high-reliability distribution network. The distribution of voltage and current traveling waves along the lines is comprehensively considered in this model. Secondly, we analyze the influence of noise interference, analog-digital conversion frequency, and conversion bits on the location accuracy. The simulation method of noise and analog-digital conversion is proposed based on simulated samples. Then, a wavelet filter is used to reduce the influence of noise on the calibration of the traveling wave arrival time, and matrix modulus of S transform is used to identify the arrival time for the wave. Finally, the simulation model of a 35-kV high-reliability distribution network is established to analyze the location accuracy in the case of single-phase to ground via resistance, two-phase short-circuit to ground via resistance, and three-phase short-circuit faults. The simulation results indicate that the proposed method has high location accuracy under the above fault conditions.
Highlights
The distribution network plays an important supporting role in promoting economic and social development [1]
Scholars have studied the application of wavelet transform, Hibbert–Huang transform and S transform in traveling wave fault location
Ji et al [5] analyzed the application of the traveling wave fault location method based on wavelet transform in the 10-kV system
Summary
The distribution network plays an important supporting role in promoting economic and social development [1]. Timely and accurate fault location of the distribution network is an important foundation to ensure the safe and reliable operation of the network [2]. Scholars have studied the application of wavelet transform, Hibbert–Huang transform and S transform in traveling wave fault location. Hu et al [3] studied the principle of double-ended traveling wave fault location for transmission lines. The application of wavelet transform in traveling wave fault location is analyzed. Han et al [4] formed a switch state matrix based on the adjacency matrix and mapped the fault current distribution into a current state matrix. Ji et al [5] analyzed the application of the traveling wave fault location method based on wavelet transform in the 10-kV system.
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