In this work we present new distributed controllers for secondary frequencyand voltage control in islanded microgrids. Inspired by techniques fromcooperative control, the proposed controllers use localized information andnearest-neighbor communication to collectively perform secondary controlactions. The frequency controller rapidly regulates the microgrid frequency toits nominal value while maintaining active power sharing among the distributedgenerators. Tuning of the voltage controller provides a simple and intuitivetrade-off between the conflicting goals of voltage regulation and reactivepower sharing. Our designs require no knowledge of the microgrid topology,impedances or loads. The distributed architecture allows for flexibility andredundancy, and eliminates the need for a central microgrid controller. Weprovide a voltage stability analysis and present extensive experimental resultsvalidating our designs, verifying robust performance under communicationfailure and during plug-and-play operation.
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