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The ability of a Redox Flow Battery (RFB) is analysed in the present paper to minimise the tie-line power and frequency deviations of the five-area thermal power system. Initially, a power system network with five areas and a non-linearity of Generation Rate Constraint (GRC) is designed in MATLAB/SIMULINK environment. After that, the values of Proportional Derivative-Proportional Integral Derivative (PD-PID) controller are evaluated for the proposed system by using Search Group Algorithm (SGA). The best control parameters of PD-PID controller are selected by having objective function as Integral Time Multiplied Absolute Error (ITAE). Finally, the RFB is installed in area-1, area-2, area-3, area-4 and area-5 for dynamic response enhancement. Results of simulation show that, better transient response characteristics can be obtained by using PD-PID controller along with RFB in area-1. Further, the system is also …