The Impact of Wind Power Connection on Relay Protection of Distribution Network

Introduced the current development of distributed energy and the impact of large-scale wind power integration on relay protection. The grid connected models of two types of wind turbines were built based on MATLAB/SIMULINK, and the short-circuit current characteristics of different types of wind turbines in case of short circuit at the outlet were analyzed through simulation, as well as the short-circuit current characteristics of the same type of unit with different grid connected capacities. A circuit model for connecting wind farms to distribution lines was built and theoretical calculations were conducted. The fault current characteristics of wind power connected and not connected were compared through simulation. The results showed that under the joint action of transition power group and wind farm impedance, wind power connected will cause a decrease in upstream fault current, affecting the selectivity and sensitivity of relay protection.