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Volume 6 Issue 5
Sep.  2019

IEEE/CAA Journal of Automatica Sinica

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Ali Azarbahram, Amir Amini and Mahdi Sojoodi, "Resilient Fixed-Order Distributed Dynamic Output Feedback Load Frequency Control Design for Interconnected Multi-Area Power Systems," IEEE/CAA J. Autom. Sinica, vol. 6, no. 5, pp. 1139-1151, Sept. 2019. doi: 10.1109/JAS.2019.1911687
Citation: Ali Azarbahram, Amir Amini and Mahdi Sojoodi, "Resilient Fixed-Order Distributed Dynamic Output Feedback Load Frequency Control Design for Interconnected Multi-Area Power Systems," IEEE/CAA J. Autom. Sinica, vol. 6, no. 5, pp. 1139-1151, Sept. 2019. doi: 10.1109/JAS.2019.1911687

Resilient Fixed-Order Distributed Dynamic Output Feedback Load Frequency Control Design for Interconnected Multi-Area Power Systems

doi: 10.1109/JAS.2019.1911687
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  • The paper proposes a novel $ H_\infty$ load frequency control (LFC) design method for multi-area power systems based on an integral-based non-fragile distributed fixed-order dynamic output feedback (DOF) tracking-regulator control scheme. To this end, we consider a nonlinear interconnected model for multi-area power systems which also include uncertainties and time-varying communication delays. The design procedure is formulated using semi-definite programming and linear matrix inequality (LMI) method. The solution of the proposed LMIs returns necessary parameters for the tracking controllers such that the impact of model uncertainty and load disturbances are minimized. The proposed controllers are capable of receiving all or part of subsystems information, whereas the outputs of each controller are local. These controllers are designed such that the resilient stability of the overall closed-loop system is guaranteed. Simulation results are provided to verify the effectiveness of the proposed scheme. Simulation results quantify that the distributed (and decentralized) controlled system behaves well in presence of large parameter perturbations and random disturbances on the power system.

     

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    Highlights

    • We incorporate a class of nonlinear terms in the model which can also be translated to uncertain system dynamics. The proposed control configuration comprises a DOF controller in series with an integral term to eliminate the tracking error. The DOF controller is fixed-order, implying that its order can be chosen arbitrarily based on the system conditions and other design constraints. Controller parameters are computed based on convex constrained optimization.
    • Computed control parameters are non-fragile so that the controllers can tolerate a predefined level of uncertainty with nominally designed values. In addition, time-varying communication time-delays are considered for each area. In this approach, controller input and output are local.
    • Designed controllers for each area are able to incorporate the output information of all or just the accessible subsystems to generate the control input signal.

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