Mathematical model for the dcac inverter for the Space Shuttle
Abstract
The reader is informed of what was done for the mathematical modeling of the dcac inverter for the Space Shuttle. The mathematical modeling of the dcac inverter is an essential element in the modeling of the electrical power distribution system of the Space Shuttle. The electrical power distribution system which is present on the Space Shuttle is made up to 3 strings each having a fuel cell which provides dc to those systems which require dc, and the inverters which convert the dc to ac for those elements which require ac. The inverters are units which are 2 wire structures for the main dc inputs and 2 wire structures for the ac output. When 3 are connected together a 4 wire wye connection results on the ac side. The method of modeling is performed by using a Least Squares curve fitting method. A computer program is presented for implementation of the model along with graphs and tables to demonstrate the accuracy of the model.
 Publication:

In NASA. Johnson Space Center
 Pub Date:
 November 1987
 Bibcode:
 1987asee....1T....B
 Keywords:

 Current Converters (Ac To Dc);
 Current Distribution;
 Electric Current;
 Inverted Converters (Dc To Ac);
 Mathematical Models;
 Computer Programs;
 Curve Fitting;
 Electric Wire;
 Fuel Cells;
 Least Squares Method;
 Space Shuttles;
 Electronics and Electrical Engineering