Research on Asymmetric Fault Location of Wind Farm Collection System Based on Compressed Sensing

Aiming at the problem that most of the cables in the power collection system of offshore wind farms are buried deep in the seabed, which makes it difficult to detect faults, this paper proposes a two-step fault location method based on compressed sensing and ranging equation. The first step is to determine the fault zone through compressed sensing, and improve the data measurement, dictionary design and algorithm reconstruction: Firstly, the phase-locked loop trigonometric function method is used to suppress the spike phenomenon when extracting the fault voltage, so that the extracted voltage value will not have a large error due to the voltage fluctuation. Secondly,theλ-NIM dictionary is designed by using the node impedance matrix and the fault location coefficient to further reduce the influence of pseudo-fault points. Finally, the CoSaMP algorithm is improved with the generalized Jaccard coefficient to improve the reconstruction accuracy. The second step is to use the ranging equation to accurately locate the asymmetric fault of the wind farm collection system on the basis of determining the fault interval. The simulation results show that theproposed method is more accurate than the compressed sensing method and impedance method in fault section location and fault location accuracy, the relative error is reduced from 0.75% to 0.4%, and has a certain anti-noise ability. © 2023, Tech Science Press. All rights reserved.