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The electric power generated by the micro-turbine generator is at higher frequency (1.6kHz at rated speed) and is converted to DC via a 3-phase PWM rectifier. The DC power is then converted to AC by means of a 3-phase PWM inverter unit. The AC electrical outputs of both the SOFC and the micro-turbine are combined, as shown, and connected to the utility. A line frequency isolation transformer is employed at the output terminals of both the SOFC and the micro-turbine power conditioning units. Each transformer provides isolation as well as voltage matching with the utility. The hybrid power generating system is connected to the utility via a static isolator to facilitate rapid disconnection in the event of a fault. Shared dc-link power conditioning unit [19]: Figure 8-22 shows an alternative power conditioning unit for the fuel cell turbine hybrid system. In this approach a common dc-link system is envisioned. The SOFC DC-DC converter and the micro-turbine PWM rectifier stages output are paralled together to form a common dc-link. The main advantage of this approach is that only one common DC-AC power conditioning unit is necessary. This architecture has the potential to reduce the cost of the power conditioning unit of a hybrid system. UVW Heat Figure 8-22 Alternative power conditioning unit for the fuel cell turbine hybrid system with shared dc-link [19] Power conditioning units for MW-range fuel cell turbine hybrid systems [19]: FuelCell Energy Inc. (FCE) is developing an ultra-high efficiency fuel cell/turbine hybrid power plant [20]. The power system is based on an innovative cycle utilizing an indirectly heated gas turbine to supplement fuel cell generated power. System development is being conducted under the Department of Energy through the Office of Fossil Energy, and managed by the National Energy Technology Laboratory (NETL). The project objectives include the design of a 40 MW system using an internally reformed fuel cell being commercialized by FCE [20]. The power conditioning unit for multi-megawatt fuel cell hybrid systems operates at medium voltage levels (2300V, 4160V, 6600V or 11000V in the U.S.). Medium voltage power conditioner units employing integrated gate-commutated thyristor (IGCT) type devices and/or SOFC Fuel Cell DC/DC Converter Vdc Cd Micro- turbine Generator (MTG) 8-42PDF Image | Fuel Cell Handbook (Seventh Edition)
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