and scars into the baseline Freedom will allow power growth in an efficient and cost- effective manner. It is the purpose of this paper to describe the performance requirements and the present overall design of the SD power module. Principles of operation, a top level description of the module and its components, and on-orbit module assembly are included. The design of this module will evolve and be optimized as the program progresses. Therefore, the information in this paper must be considered preliminary. The SD Power Module Performance Requirements Each SD power module must provide the users on the manned base with 25 kW of electric power throughout the orbit under all insolation conditions. To meet this requirement, the module must collect solar energy, store part of the collected energy as thermal energy for use during the eclipse portion of the orbit, convert collected or stored energy to low frequency ac electric power with a thermodynamic heat engine, convert the low frequency power to power at the frequency of the primary power distribution system, and deliver that power to the interface between the SD module and the rest of the manned base. The power delivered at the interface must be greater than 25 kW to accommodate the losses in the distribution system and conversion to secondary de power, and to supply the power needed for control and monitoring. The delivered 25 kW is measured as a total at the user connection points. The module must also be capable of supplying a short-term peak power of 28.75 kW to the user for up to
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