Change in frequency with load is a great concern. In this paper a load frequency problem is address by taking two area power systems with hydro and wind power plant in each unit in the first instant. Then SMES and HVDC link is introduce in the system to improve the system performance. In all the cases TID controller is used and the parameters of controller, SMES and HVDC link are tuned using Differential Evolution (DE) algorithm. The whole system is design in MATLAB/SIMULINK model; different load pattern is applied in place of step load and results show that with SMES and HVDC link the improvement of system occurs in terms of deviation of frequency and tie line power.