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The current study is dedicated to design a novel coordinated controller to effectively increase power system rotorangle stability. In doing so, the coordinated design of an AVR (automatic voltage regulator), PSS2B, and TCSC (thyristorcontrolled series capacitor)-based POD (power oscillation damping) controller is proposed. Although the recentlyemployed coordination between a CPSS (conventional power system stabilizer) and a TCSC-based POD controller hasbeen shown to improve power system damping characteristics, neglecting the negative impact of existing high-gainAVR on the damping torque by considering its parameters as given values, may reduce the effectiveness of a CPSSPODcontroller. Thus, using a technologically viable stabilizer such as PSS2B rather than the CPSS in a coordinatedscheme with an AVR and POD controller can constitute a well-established design with a structure that as a highpotential to significantly improve the rotor angle stability. The design procedure is formulated as an optimizationproblem in which the ITSE (integral of time multiplied squared error) performance index as an objective function isminimized by employing an IPSO (improved particle swarm optimization) algorithm to tune adjustable parameters. The robustness of the coordinated designs is guaranteed by concurrently considering some operating conditionsin the optimization process. To evaluate the performance of the proposed controllers, eigenvalue analysis and timedomain simulations were performed for different operating points and perturbations simulated on 2A4M (two-areafour-machine) power systems in MATLAB/Simulink. The results reveal that surpassing improvement in damping ofoscillations is achieved in comparison with the CPSS-TCSC coordination.

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