Analysis and design of a high power, digitally-controlled spacecraft power system. Semiannual report

Technical Report · Tue May 01 00:00:00 EDT 1990

OSTI ID:6118783

Lee, F C; Cho, B H

The progress to date on the analysis and design of a high power, digitally controlled spacecraft power system is described. Several battery discharger topologies were compared for use in the space platform application. Updated information has been provided on the battery voltage specification. After consultations with NASA, it was decided to trade-off the following topologies: (1) boost converter; (2) multi-module, multi-phase boost converter; and (3) voltage-fed push-pull with auto-transformer. A non-linear design optimization software tool was employed to facilitate an objective comparison. The results indicate that a four-module, boost converter with each module operating 90 degrees out of phase is the optimum converter for the space platform. Large-signal and small-signal models were generated for the shunt, charger, discharger, battery, and the mode controller. The effect of battery voltage imbalance on parallel dischargers was investigated with respect to dc and small-signal responses. Similarly, the effects of paralleling dischargers and chargers were also investigated. A solar array and shunt model was included in these simulations. A model for the bus mode controller (power control unit) was also developed to interface the Orbital replacement Unit (ORU) model to the platform power system. Small signal models were used to generate the bus impedance plots in the various operating modes. The large signal models were integrated into a system model, and time domain simulations were performed to verify bus regulation during mode transitions.

• Research Organization: Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (USA)
• OSTI ID: 6118783
• Report Number(s): N-91-11053; NASA-CR-186546; NAS-1.26:186546; CNN: NAG5-1232
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
SPACECRAFT POWER SUPPLIES
DESIGN
ELECTRIC BATTERIES
SPECIFICATIONS
BYPASSES
COMPUTERIZED SIMULATION
DIGITAL SYSTEMS
ELECTRIC POTENTIAL
IMPEDANCE
MATHEMATICAL MODELS
OPTIMIZATION
PROGRESS REPORT
SOLAR CELL ARRAYS
DOCUMENT TYPES
ELECTROCHEMICAL CELLS
ELECTRONIC EQUIPMENT
EQUIPMENT
POWER SUPPLIES
SIMULATION
SOLAR EQUIPMENT
250904* - Energy Storage- Batteries- Other Applications