Study on the Influence of Distance Protection in Power Grid with New Energy Sources

The reliability of the protection for the tie line of wind farm is of great significance for the safety of the power grid and wind farm. Nevertheless, the complicated fault current characteristics of wind turbine generators deteriorate the performance of traditional protection schemes (like distance protection), or even result in fail-to-trip of traditional protection schemes. The fault characteristics of the new energy source under the crowbar action and no action are analyzed firstly. Then, the influence of the doubly-fed wind farm on the distance protection under different operating modes is analyzed. The correctness of the analysis conclusion is verified by simulation. The research results have important guiding significance for the grid relay protection configuration after the new energy.