Abstract
This paper proposes a novel discrete-event supervisory controller (SC) that enables transitions among discrete operational modes to prevent unacceptable conditions and microgrid collapse. For example, preventing an islanded ac microgrid from collapsing when its grid-forming unit is tripped out. The dynamic behaviour and transients of the microgrid are investigated to verify the functionality of the proposed SC. In contrast to the conventional automata-based SCs, the envisioned SC is designed and synthesized based on Supervisory Control Theory. The studies show that the SC can maintain the microgrid operational under adverse conditions by providing appropriate mode-switch commands, and forcing the distributed resource local controllers to follow these commands. The reported studies are conducted in a hybrid MATLAB/PSCAD platform where the SC is represented in MATLAB and the power circuitry is modeled in PSCAD.
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