Combined Frequency and Voltage Stabilization of Thermal-Thermal System with UPFC and RFB

Abstract

This paper studies a combined application of Load Frequency Control (LFC) and Automatic Voltage Regulator (AVR) in a two-area power system with thermal reheat and non-reheat plants. Proportional-integral-derivative with filter (PIDF) and PI controllers are considered to control frequency and voltage, respectively. Integral square error (ISE) is chosen as figure of demerit (FOD) and a meta-heuristic sine cosine algorithm (SCA) is implemented to adjust the control parameters to optimum values. Further improvements in the system dynamics are ensured by the combined application of unified power flow controller (UPFC) and redox flow battery (RFB). System dynamic performances on MATLAB/SIMULINK® platform show the efficacy of the proposed scheme for small load perturbation (SLP) and random load perturbation (RLP). Finally, sensitivity is tested by the change in system parameters, which shows the robustness of PIDF and PI controllers.