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Microgrid for High-Surety Power: Architectures, Controls, Protection, and Demonstration  371



                            Grid                                        Load





                          Gas engine                                   Battery





                           PV panel                                    Fuel cell
                                                                     H 2
                                                                     O 2


            FIGURE 14.15  Fuel cell power mode of Super UPS.




                            Grid                                        Load





                          Gas engine                                   Battery





                           PV panel                                   Fuel cell
                                                                      H 2
                                                                      O 2
                         (a)


                            Grid                                        Load





                          Gas engine                                   Battery





                           PV panel                                   Fuel cell
                                                                      H 2
                                                                      O 2
                         (b)

            FIGURE 14.16  Power flows of FC power mode.
   379   380   381   382   383   384   385   386   387   388   389