Simulation Study of Two Area Multi Unit Power Systems using PI-PD Controller with RFB and UPFC

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 with PID/PI-PD. Then RFB and UPFC are introduced in the system to improve the system performance. In all the cases PID/PI-PD controller is used and the parameters of controller, RFB and UPFC 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 pulse load results show that with PI-PD controller the improvement of system occurs in terms of deviation of frequency and tie line power.