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Load-frequency control

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Load-frequency control (LFC) is vital for maintaining power system stability, ensuring that frequency and power flows remain within acceptable limits during load changes. Turbine-governor control eliminates rotor accelerations and decelerations following load changes. However, a steady-state frequency error persists when the change in the turbine-governor reference setting is zero. In an interconnected power system, each area agrees to export or import a scheduled amount of power through...
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Beams are structural elements commonly employed in engineering applications requiring different load-carrying capacities. The first step in analyzing a beam under a distributed load is to simplify the problem by dividing the load into smaller regions, which allows one to consider each region separately and calculate the magnitude of the equivalent resultant load acting on each portion of the beam. The magnitude of the equivalent resultant load for each region can be determined by calculating...
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Related Experiment Video

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Experimental Investigation of the Hierarchical Control in DC Microgrids Using a Real-time Simulator
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Resilient Model Free Adaptive Distributed LFC for Multi-Area Power Systems Against Jamming Attacks.

Xiaojie Qiu, Yingchun Wang, Huaguang Zhang

    IEEE Transactions on Neural Networks and Learning Systems
    |November 5, 2021
    PubMed
    Summary

    This study introduces a resilient load frequency control (LFC) for power systems facing jamming attacks. The model-free adaptive control (MFAC) with predictive compensation ensures system stability and frequency tracking accuracy.

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    Area of Science:

    • Electrical Engineering
    • Control Systems
    • Cybersecurity

    Background:

    • Power systems require stable frequency for reliable operation.
    • Distributed control is essential for large-scale interconnected power grids.
    • Jamming attacks pose a significant threat to power system stability.

    Purpose of the Study:

    • To develop a distributed resilient load frequency control (LFC) strategy.
    • To address uncertainties and nonlinearity in multi-area power systems.
    • To mitigate the impact of stochastic jamming attacks on system frequency.

    Main Methods:

    • Adoption of model-free adaptive control (MFAC) using input-output data.
    • Modeling jamming attacks as a stochastic process.
    • Development of a multistep predictive compensation algorithm.
    • Design of a distributed MFAC protocol integrating predictive compensation.

    Main Results:

    • The proposed distributed MFAC protocol ensures frequency tracking errors converge to a small neighborhood.
    • The system demonstrates resilience against jamming attacks.
    • Simulation results validate the effectiveness of the proposed control strategy.

    Conclusions:

    • The developed distributed MFAC with predictive compensation offers a robust solution for LFC in interconnected power systems.
    • This approach enhances system security and reliability against cyber threats like jamming attacks.
    • The method effectively manages system uncertainties and nonlinearities.