Passivity-based power sharing and voltage regulation in DC microgrids with unactuated buses
In this paper, we propose a novel four-stage distributed controller for a DC microgrid that achieves power sharing and average voltage regulation for the voltages at actuated and unactuated buses. The controller is presented for a DC microgrid comprising multiple distributed generating units (DGUs)...
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Zusammenfassung: | In this paper, we propose a novel four-stage distributed controller for a DC
microgrid that achieves power sharing and average voltage regulation for the
voltages at actuated and unactuated buses. The controller is presented for a DC
microgrid comprising multiple distributed generating units (DGUs) with
time-varying actuation states; dynamic RLC lines; nonlinear constant impedance,
current and power (ZIP) loads and a time-varying network topology. The
controller comprising a nonlinear gain, PI controllers, and two dynamic
distributed averaging stages is designed for asymptotic stability. This
constitutes first deriving passivity properties for the DC microgrid, along
with each of the controller subsystems. Thereafter, design parameters are found
through a passivity-based optimisation using the worst-case subsystem
properties. The resulting closed-loop is robust against DGU actuation changes,
network topology changes, and microgrid parameter changes. The stability and
robustness of the proposed control is verified via simulations. |
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DOI: | 10.48550/arxiv.2301.13533 |