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Microgrid for High-Surety Power: Architectures, Controls, Protection, and Demonstration  357




                                Grid
                                                                   Load

                             Li-ion battery



                               Gas engine



                               PV panel



                               Fuel cell
                               H 2
                               O 2
                             (a)

                                Grid
                                                                    Load


                                                       Load inverter
                               Gas engine
                                                                    Li-ion
                                                                    battery
                               PV panel


                               Fuel cell

                               H 2
                               O 2
                               (b)

                                Grid                                Load



                               Gas engine
                                                     Redundant inverter  Li-ion
                                                                    battery
                               PV panel


                               Fuel cell
                               H 2
                               O 2
                               (c)

            FIGURE 14.2  Star architectures for Super UPS. (a) Star architecture I. (b) Star architecture II. (c) Star
            architecture III.
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