Decentralised L1 Adaptive Primary Controllers and Distributed
Consensus-Based Secondary Control for DC Microgrids with Constant-Power Loads
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by
Daniel O'Keeffe, Stefano Riverso, Laura Albiol-Tendillo, Gordon
Lightbody
2018
Abstract
Constant-power loads are notoriously known to destabilise power systems, such
as DC microgrids, due to their negative incremental impedance. This paper
equips distributed generation units with decentralised L1 adaptive controllers
at the primary level of the microgrid control hierarchy. Necessary and
sufficient conditions are provided to local controllers for overall microgrid
stability when constant-power loads are connected. The advantages of the
architecture over conventional heuristic approaches are: (i) scalable design,
(ii) plug-and-play functionality, (iii) well defined performance and robustness
guarantees in a heterogeneous and uncertain system, and (iv) avoids the need
for online measurements to obtain non-a priori system impedance information.
The proposed primary control architecture is evaluated with distributed
consensus-based secondary level controls using a bus-connected DC microgrid,
which consists of DC-DC buck and boost converters, linear and non-linear loads.
Stability of the overall hierarchical control system is proven using a
unit-gain approximation of the primary level.
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