Fault location based on parameter estimation in hybrid transmission lines of wind farm

In order to solve the problem of abandoned wind due to short circuit faults in wind farms, a wind farm fault location method based on parameter estimation is proposed. Traveling wave characteristics are used to construct transfer equations including fault point location. The location of the fault is obtained by solving the overdetermined equations formed by the multi-measurement point transmission equations through parameter estimation theory. The parameter estimation data error detection can determine and remove bad data to improve the positioning accuracy. Combined with the fault section detection, this algorithm solves the fault branch misjudgment problem in the short circuit near the wind farm's node. It overcomes the shortcomings of the traditional method in calculating the traveling wave velocity. The effectiveness of this method is verified by using PSCAD/EMTDC simulation software and the results show that it can be used to detect fault locations of transmission lines in the wind power farms. © 2020, Solar Energy Periodical Office Co., Ltd. All right reserved.