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Record 1 of 64258
Power Management in Regenerative Life Support Systems
Author and Affiliation:
Crawford, Sekou(Orbital Sciences Corp., Moffett Field, CA United States)
Pawlowski, Christopher(Orbital Sciences Corp., Moffett Field, CA United States)
Finn, Cory(NASA Ames Research Center, Moffett Field, CA United States)
Mead, Susan C. [Technical Monitor]
Abstract: Effective management of power can reduce the cost of launch and operation of regenerative life support systems. Variations in power may be quite severe and may manifest as surges or spikes, While the power plant may have some ability to deal with these variations, with batteries for example, over-capacity is expensive and does nothing to address the fundamental issue of excessive demand. Because the power unit must be sized to accommodate the largest demand, avoiding power spikes has the potential to reduce the required size of the power plant while at the same time increasing the dependability of the system. Scheduling of processors can help to reduce potential power spikes. However, not all power-consuming equipment is easily scheduled. Therefore, active power management is needed to further decrease the risk of surges or spikes. We investigate the use of a hierarchical scheme to actively manage power for a model of a regenerative life support system. Local level controllers individually determine subsystem power usage. A higher level controller monitors overall system power and detects surges or spikes. When a surge condition is detected, the higher level controller conducts an 'auction' and describes subsystem power usage to re-allocate power. The result is an overall reduction in total power during a power surge. The auction involves each subsystem making a 'bid' to buy or sell power based on local needs. However, this re-allocation cannot come at the expense of life support function. To this end, participation in the auction is restricted to those processes meeting certain tolerance constraints. These tolerances represent acceptable limits within which system processes can be operated. We present a simulation model and discuss some of our results.
Publication Date: Jan 05, 1999
Document ID:
20010082933
(Acquired Sep 14, 2001)
Subject Category: MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
Document Type: Preprint
Meeting Information: International Conference on Environmental Systems; 10-13 Jul. 2000; Toulouse; France
Contract/Grant/Task Num: RTOP 131-20-10
Financial Sponsor: NASA Ames Research Center; Moffett Field, CA United States
Organization Source: NASA Ames Research Center; Moffett Field, CA United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: LIFE SUPPORT SYSTEMS; SYSTEMS MANAGEMENT; POWER; COMPUTERIZED SIMULATION; OPERATING COSTS; SCHEDULING
Availability Source: Other Sources
Availability Notes: Abstract Only
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