This paper adopts a power system stabilizer (PSS) control structure-based design method to damp out inter-area modes in power systems through non-conventional equipment such as static Var compensator (SVC) and wind turbine generator (WTG). The PSS controller is designed using up to 2 lead/lag stages and is tuned by making stable all trajectories of the dominant modes. Comparisons of different combinations of feedback signals and actuator control actions are exhibited achieving different damping levels. The correct operation of the controller is analyzed when both actuators are added to the system, thus the oscillatory mode is mitigated in case of large disturbances, adding up to 20% of damping. Small-signal analysis (SSA) and time domain simulations are provided to evaluate the effectiveness of the controller under disturbances.