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    Cascade controller design via controller synthesis for load frequency control of electrical power systems
    (Tubitak Scientific & Technological Research Council Turkey, 2024) Guler, Yavuz; Nalbantoglu, Mustafa; Kaya, Ibrahim
    The regulation of tie -line electricity flow and frequency of electrical power systems (EPS) is crucial for ensuring their robustness to parameter changes and efficient management of disturbances. To this end, a novel cascade control design approach utilizing a serial Proportional -Integral -Derivative controller with a filter (PIDF) is proposed in this paper. The parameters of the controllers are derived analytically, and it is employed in both loops of the cascade control system to regulate the Load Frequency Control (LFC) of EPS. The implementation of PIDF controllers in both loops is utilized in the cascade control scheme for various power systems featuring different turbine topologies. This approach has been applied to single, and two -area power systems and has exhibited enhanced performance compared to other commonly referenced studies in the literature. To assess the effectiveness of the cascade control approach proposed performance metrics such as settling time, peak value (overshoot), and integral absolute error (IAE) value of frequency and tie -line power variations are utilized to gauge the system's response to a load perturbation. Additionally, the suggested cascade control technique and design process have undergone robustness testing with +/- 50% changes in system parameters to validate their reliability.
  • [ X ]
    Öğe
    Load Frequency Control of Single-Area Power System with PI-PD Controller Design for Performance Improvement
    (Springer Singapore Pte Ltd, 2023) Guler, Yavuz; Kaya, Ibrahim
    Load frequency control (LFC) is an important control problem as it determines the quality of power generation by controlling the system frequency and inter-area tie-line power. To maintain a good quality power supply, LFC must be robust against unknown external disturbances and parameter variations of the power system. Therefore, this paper presents the design of PI-PD controllers, which are robust against parameter changes and have good disturbance suppression capability, for load frequency control of a single-area single- or multi-source power system. PI-PD controller parameters were obtained by applying the weighted geometric center method to the stability boundary locus of the closed-loop control system. The approach was applied to both the inner and outer loops of the PI-PD control system structure, sequentially. Performance and robustness of the proposed PI-PD control system are evaluated using some well-known integral error criteria values, settling time, and peak value (overshoot) in the analysis of the power system with both nominal values and & PLUSMN; 50% changes in the system parameters. The simulation results show that the designed PI-PD controller effectively limits the effect of load disturbance and variations in system parameters.