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A CONTROL ARCHITECTURE TO COORDINATE RENEWABLE ENERGY
SOURCES AND ENERGY STORAGE SYSTEMS IN ISLANDED MICROGRIDS
ABSTRACT
Coordinated operation of micro grids requires that energy management system takes into
account both the available power in renewable energy sources (RES) and storage capacity of
energy storage systems (ESS). In this paper, a coordinated architecture of islanded ac micro grids
with smooth switching droop control (SSDC) is derived. Based on the proposed SSDC
approach, flexible power control of each ESS/RES unit can be obtained with seamless modes
changes. Furthermore, decentralized power management can be achieved by executing frequency
bus-signaling. The power management principle based on different operational modes is
explained in detail and small-signal analysis is carried out for SSDC. Real-time hardware-in-the-
loop results of an islanded micro grid are provided under several scenarios to validate the
proposed coordinated control strategy.

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