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Title
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Plug-and-Play Voltage Stabilization in Inverter-Interfaced Microgrids via a Robust Control Strategy
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Type
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JournalPaper
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Keywords
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Decentralized control, inverters, microgrids, plug-and-play (PnP) capability, robust control, voltage control.
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Abstract
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This paper proposes a decentralized control strategy for the voltage regulation of islanded inverter-interfaced microgrids. We show that an inverter-interfaced microgrid under plug-and-play (PnP) functionality of distributed generations (DGs) can be cast as a linear time-invariant system subject to polytopic-type uncertainty. Then, by virtue of this novel description and use of the results from theory of robust control, the microgrid control system guarantees stability and a desired performance even in the case of PnP operation of DGs. The robust controller is a solution of a convex optimization problem. The main properties of the proposed controller are that: 1) it is fully decentralized and local controllers of DGs that use only local measurements; 2) the controller guarantees the stability of the overall system; 3) the controller allows PnP functionality of DGs in microgrids; and 4) the controller is robust against microgrid topology change. Various case studies, based on time-domain simulations in MATLAB/SimPowerSystems Toolbox, are carried out to evaluate the performance of the proposed control strategy in terms of voltage tracking, microgrid topology change, PnP capability features, and load changes.
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Researchers
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Alireza Karimi (Third Researcher), Qobad Shafiee (Second Researcher), Mahdieh Sadat Sadabadi (First Researcher)
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