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  • 1
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    Automation concepts for large space power systems (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A study was undertaken to develop a methodology for analyzing, selecting, and implementing automation functions for multi-hundred-kW photovoltaic power systems intended for manned space station. The study involved identification of generic power system elements and their potential faults, definition of automation functions and their resulting benefits, and partitioning of automation functions between power subsystem, central spacecraft computer, and ground. Automation to a varying degree was concluded to be mandatory to meet the design and operational requirements of the space station. The key drivers are indefinite lifetime, modular growth, high performance flexibility, a need to accommodate different electrical user load equipment, on-orbit assembly/maintenance/servicing, and potentially large number of power subsystem components. Functions that are good candidates for automation via expert system approach includes battery management and electrical consumables management.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Power subsystem automation study (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Generic power-system elements and their potential faults are identified. Automation functions and their resulting benefits are defined and automation functions between power subsystem, central spacecraft computer, and ground flight-support personnel are partitioned. All automation activities were categorized as data handling, monitoring, routine control, fault handling, planning and operations, or anomaly handling. Incorporation of all these classes of tasks, except for anomaly handling, in power subsystem hardware and software was concluded to be mandatory to meet the design and operational requirements of the space station. The key drivers are long mission lifetime, modular growth, high-performance flexibility, a need to accommodate different electrical user-load equipment, onorbit assembly/maintenance/servicing, and potentially large number of power subsystem components. A significant effort in algorithm development and validation is essential in meeting the 1987 technology readiness date for the space station.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-170974 , NAS 1.26:170974 , MCR-83-645
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Controlling Solar-Power Systems With Distributed Processors (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: System undergoing development uses distributed microprocessors to monitor and control photovoltaic power system. Equipment increases life expectancy and reliability of power system and decreases costs. Adapted to vehicular, residential, and commercial solar and nonsolar power systems. Equipment especially desirable in systems with overall power levels above few kilowatts.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-15101 , NASA Tech Briefs (ISSN 0145-319X); 8; 4; P. 469
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    NASA TECHNICAL REPORTS
  • 4
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    Development of single-cell protectors for sealed silver-zinc cells (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Three design approaches to cell-level protection were developed, fabricated, and tested. These systems are referred to as the single-cell protector (SCP), multiplexed-cell protector(MCP). To evaluate the systems 18-cell battery packs without cell level control were subjected to cycle life test. A total of five batteries were subjected to simulate synchronous orbit cycling at 40% depth of discharge at 22C. Batteries without cell-level protection failed between 345 and 255 cycles. Cell failure in the cell level protected batteries occurred between 412 and 540. It was determined that the cell-level monitoring and protection is necessary to attain the long cycle life of a AgZn battery. The best method of providing control and protection of the AgZn cells depends on the specific application and capability of the user.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-159407 , MCR-78-571
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Algorithms for the Automated Power Systems Management (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The system breadboard for the demonstration of Automated Power Systems Management (APSM) functions has been designed, fabricated, and is in the final stages of verification and testing. APSM functions fall into categories of fault detection and correction, commanding system and subsystem test and diagnoses, relay position monitoring, data acquisition and processing, and power management. All these functions are accomplished through software residing in 8-bit microprocessors dedicated to each group of Viking Orbiter power breadboard subassemblies and a 16-bit microprocessor serving as the central processor for the power system. This paper describes key monitoring, diagnostic, and control algorithms used in the APSM breadboard.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Intersociety Energy Conversion Engineering Conference; Aug 05, 1979 - Aug 10, 1979; Boston, MA
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Conceptual definition of Automated Power Systems Management (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Automated Power Systems Management (APSM) is defined as the capability of a spacecraft power system to automatically perform monitoring, computational, command, and control functions without ground intervention. Power systems for future planetary spacecraft must have this capability because they must perform up to 10 years, and accommodate real-time changes in mission execution autonomously. Specific APSM functions include fault detection, isolation, and correction; system performance and load profile prediction; power system optimization; system checkout; and data storage and transmission control. This paper describes the basic method of implementing these specific functions. The APSM hardware includes a central power system computer and a processor dedicated to each major power system subassembly along with digital interface circuitry. The major payoffs anticipated are in enhancement of spacecraft reliability and life and reduction of overall spacecraft program cost.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Intersociety Energy Conversion Engineering Conference; Aug 28, 1977 - Sep 02, 1977; Washington, DC
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    NASA TECHNICAL REPORTS
  • 7
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    Cell-level battery charge/discharge protection system (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper describes three design approaches to individual cell monitoring and control for sealed secondary battery cells. One technique involves a modular strap-on single cell protector which contains all the electronics required for monitoring cell voltage, responding to external commands, and forming a bypass circuit for the cell. A second technique, the multiplexed cell protector, uses common circuitry to monitor and control each cell in a battery pack. The third technique, the computerized cell protector, by replacing the hard-wired logic of the multiplexed cell protector with a microprocessor, achieves greatest control flexibility and inherent computational capability with a minimum parts count implementation.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Intersociety Energy Conversion Engineering Conference; Aug 28, 1977 - Sep 02, 1977; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Cycle life characteristics of sealed silver-zinc cell with inorganic separator (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Two batteries containing 18 cells have been cycling in a simulated synchronous (24-hour) orbit for over a year at 40% depth of discharge at 22 C. One battery is under individual cell monitoring and control and the other battery is controlled at the battery level. The battery with individual cell monitoring and protection has performed over 350 cycles with no sign of failure. The battery without individual cell protection failed at 270 cycles from failure to remain above the specified minimum discharge voltage. A significant conclusion is that the sealed Ag-Zn cells manufactured with the inorganic separator material have demonstrated their capability to cycle at a fairly high depth of discharge and are worthy of consideration in short life synchronous orbit applications.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Intersociety Energy Conversion Engineering Conference; Aug 28, 1977 - Sep 02, 1977; Washington, DC
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    NASA TECHNICAL REPORTS
  • 9
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    Definition study for photovoltaic residential prototype system (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A parametric sensitivity study and definition of the conceptual design is presented. A computer program containing the solar irradiance, solar array, and energy balance models was developed to determine the sensitivities of solar insolation and the corresponding solar array output at five sites selected for this study as well as the performance of several solar array/battery systems. A baseline electrical configuration was chosen, and three design options were recommended. The study indicates that the most sensitive parameters are the solar insolation and the inverter efficiency. The baseline PST selected is comprised of a 133 sg m solar array, 250 ampere hour battery, one to three inverters, and a full shunt regulator to limit the upper solar array voltage. A minicomputer controlled system is recommended to provide the overall control, display, and data acquisition requirements. Architectural renderings of two photovoltaic residential concepts, one above ground and the other underground, are presented. The institutional problems were defined in the areas of legal liabilities during and after installation of the PST, labor practices, building restrictions and architectural guides, and land use.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-135056 , MCR-76-394 , ERDA/NASA-19768
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Solar cell dark I-V characteristics and their applications. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper presents the preliminary results of studies conducted to evaluate the feasibility of and to generate techniques for the use of dark forward current-voltage characteristics in the checkout of the Apollo Telescope Mount Solar Array. Methods for the determination of lumped series resistance and prediction of the illuminated I-V curve using the dark characteristics are also presented. The paper addresses itself primarily to the generation of a valid performance testing and flight readiness checkout technique using the forward characteristics of the solar cell.
    Keywords: AUXILIARY SYSTEMS
    Type: Intersociety Energy Conversion Engineering Conference; Energy 70; Sep 21, 1970 - Sep 25, 1970; Las Vegas, NV
    Format: text
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