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Power Systems Analysis
Power Systems AnalysisThis program calculates thermodynamic and transport properties of gaseous, liquid and solid species (TP, HP and SP), according to U.S. customary and International units. The user can analyze power cycles (Carnot, Brayton, Rankine, Otto and Diesel) and power cycle components and processes (compression, combustion and expansion).
This software package should prove to be a good tool for those who are involved at various levels with design, operation and management of power systems. It should provide the user with the opportunity to more quickly, easily and effectively do his/her work, explore more options, save time and give more confidence in carrying out engineering calculations.
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Power Systems Analysis:
The following figure, an example of the analysis currently being performed for the ISS program, shows part of a 2-week assembly mission. During this period (around shuttle separation), the orientation of the station is constantly changing. The dark bars show when the station is shadowed by the Earth. The three curves show the power demand, solar array power, and battery depth of discharge for one representative power channel. Battery depth of discharge is a measure of the energy removed from the batteries in comparison to their energy capacity. During the example analysis period, the solar array power drops, requiring more energy to be drawn from the batteries, resulting in a higher depth of discharge.
Typical analysis output for load-following case. Top: Load demand. Middle: Available array power. Bottom: Battery depth of discharge.
In this example, the depth of discharge reached a relatively high level. However, the mission was still viable, since no hardware limits were exceeded, and the batteries were not fully drained. However, this may not be true for all assessments. The model might detect hardware limit violations or predict that the battery depth of discharge reaches 100 percent. At 100-percent depth of discharge, the battery is completely drained, and an unacceptable "blackout" occurs. Simpler power system models that do not account for all the factors that affect the power system would not be able to accurately predict these conditions.
Although its primary use has been to support the ISS program, SPACE has many other potential uses. It can be enhanced to analyze other power systems, including space- and ground-based systems. It could also be used as a basis for "smart" power systems with fault and failure prediction, diagnosis, and recovery tools or as an addition to other satellite analysis software. SPACE represents the synthesis of over 10 years of power system analysis expertise and software development, validation, and verification. It performs detailed, integrated performance analysis of power systems to determine optimum power capability and operation.
References: - 1.Fincannon, J.: Analysis of Shadowing Effects on Spacecraft Power Systems. NASA
- 2.TM-106994, 1995.
- 3.Fincannon, J.: Analysis of Shadowing Effects on Mir Photovoltaic and Solar Dynamic Power Systems. NASA TM-106940, 1995.
- 4.Hojnicki, J., et al.: Space Station Freedom Electrical Performance Model. NASA TM-106395, 1993.
- 5.Kerslake, T.W., et al.: System Performance Predictions For Space Station Freedom's Electrical Power System. NASA TM-106396, 1993.
- 6.Fincannon, J., et al.: Load-Following Power Timeline Analyses for the International Space Station. NASA TM-107263, 1996.
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