NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Description of real-time Ada software implementation of a power system monitor for the Space Station Freedom PMAD DC testbedThe authors describe the Ada language software developed to perform the electrical power system monitoring functions for the NASA Lewis Research Center's Power Management and Distribution (PMAD) DC testbed. The results of the effort to implement this monitor are presented. The PMAD DC testbed is a reduced-scale prototype of the electric power system to be used in Space Station Freedom. The power is controlled by smart switches known as power control components (or switchgear). The power control components are currently coordinated by five Compaq 386/20e computers connected through an 802.4 local area network. The power system monitor algorithm comprises several functions, including periodic data acquisition, data smoothing, system performance analysis, and status reporting. Data are collected from the switchgear sensors every 100 ms, then passed through a 2-Hz digital filter. System performance analysis includes power interruption and overcurrent detection. The system monitor required a hardware timer interrupt to activate the data acquisition function. The execution time of the code was optimized by using an assembly language routine. The routine allows direct vectoring of the processor to Ada language procedures that perform periodic control activities.
Document ID
19920067909
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ludwig, Kimberly
(Sverdrup Technology, Inc. Brook Park, OH, United States)
Mackin, Michael
(NASA Lewis Research Center Cleveland, OH, United States)
Wright, Theodore
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Computer Programming And Software
Meeting Information
Meeting: IECEC ''91: Intersociety Energy Conversion Engineering Conference
Location: Boston, MA
Country: United States
Start Date: August 4, 1991
End Date: August 9, 1991
Accession Number
92A50533
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available