This is the final report of the high power AC/DC variable R dynamic electrical load simulator program conducted for the National Aeronautics and Space Admini¬stration (NASA) by Avco Corporation's Systems Division (Avco/SD) under Contract NAS 9-13524. Under the program, which covered the period 28 June 1973 to 18 October 1974, two simulators, along with an operating and maintenance manual, were delivered to NASA's Johnson Space Center.nThe objective of the program was to extend the design of Avco/SD's previously developed basic variable R load simulator to increase its power dissipation and transient handling capabilities, and to provide for simulation of AC as well as DC loads. The delivered units satisfy all design requirements, and provide NASA with a high power AC/DC simulation capability uniquely suited to the simula¬tion of complex load responses. A study to identify means of dynamically simula¬ting AC loads operating at less than unity power factor was also conducted. To permit effective application of the large number of variable R simulators present¬ly available at NASA, Avco recommends development of techniques for simultaneously controlling a quantity of variable R simulators. Avco also recommends development of a variable R capable of simulating AC loads of less than unity power factor.
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