A Location Method for Single-phase Grounding of Wind Farm Collecting Lines Based on a Few Measured Spots
There are many wind turbines connected to the wind farm collecting lines,and the connected system is neutral point grounded by resistance,so the existing fault location methods for power lines are difficult to apply.To solve this problem,a fault location method for single-phase grounding of the wind farm collecting lines is proposed based on a few number of post-fault currents and the line bus voltage data.The scheme is applied without the synchronous acquisition problem of dispersed phasor in other fault location methods.Firstly,based on the characteristics of the zero sequence circuit formed by the triangular connection of the high-voltage side of the wind turbine transformer and the resistance grounding of the neutral point of the wind farm,a fault area judgment method is constructed using zero sequence current distribution.Then,the correlation between the currents of wind turbine and the line is analyzed to develop a wind turbine current estimation method for line current compensation and achieves the single-terminal fault location for faulty areas.The scheme combines the judgement and distance measurement of the new areas,which reduces the measurement points and makes this fault location method applicable to working conditions with the with branch collecting line.The simulation verification results show that the proposed scheme can accurately identify faulty areas and locate fault points,and its locating performance is not affected by fault locations,fault resistance and fault inception angles.
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