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Robust multi-input multi-output integral-proportional controller for interconnected microgrid operation
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DOI：10.1016/j.epsr.2025.112509.png)
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Abstract
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This paper designs a robust multivariable IP (integral-proportional) controller for a master-slave configured islanded microgrid system. The operation of the micro-grid system is challenging due to the varying nature of the electrical loads, which demands a robust control system to guarantee voltage and frequency stability. In this work, an LQR-based multivariable IP controller is designed to ensure robustness against dynamic load conditions. The proposed multivariable IP controller for the inner current controller is designed for the slave distributed generator (DG) so as to achieve faster input-output response. This will enable the slave DG to follow the reference signal from the master DG with improved input-output response. The IP controller is first transformed into an output feedback problem, and then the output feedback problem is converted into a convex optimisation problem and solved to ensure LQR performance criteria. The performance of the proposed system is evaluated experimentally through a hardware-in-loop (HIL) setup.
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