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  • 1
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    Investigation of energy management strategies for photovoltaic systems - A predictive control algorithm (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The present investigation is concerned with the formulation of energy management strategies for stand-alone photovoltaic (PV) systems, taking into account a basic control algorithm for a possible predictive, (and adaptive) controller. The control system controls the flow of energy in the system according to the amount of energy available, and predicts the appropriate control set-points based on the energy (insolation) available by using an appropriate system model. Aspects of adaptation to the conditions of the system are also considered. Attention is given to a statistical analysis technique, the analysis inputs, the analysis procedure, and details regarding the basic control algorithm.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Investigation of energy management strategies for photovoltaic systems - An analysis technique (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Progress is reported in formulating energy management strategies for stand-alone PV systems, developing an analytical tool that can be used to investigate these strategies, applying this tool to determine the proper control algorithms and control variables (controller inputs and outputs) for a range of applications, and quantifying the relative performance and economics when compared to systems that do not apply energy management. The analysis technique developed may be broadly applied to a variety of systems to determine the most appropriate energy management strategies, control variables and algorithms. The only inputs required are statistical distributions for stochastic energy inputs and outputs of the system and the system's device characteristics (efficiency and ratings). Although the formulation was originally driven by stand-alone PV system needs, the techniques are also applicable to hybrid and grid connected systems.
    Keywords: ENERGY PRODUCTION AND CONVERSION
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    NASA TECHNICAL REPORTS
  • 3
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    The effects of controls and controllable and storage loads on the performance of stand-alone photovoltaic systems (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Stand-alone photovoltaic systems have been modeled and analyzed from sunlight in to consumer product out. By including the consumer product in the analysis, concepts such as 'product storage' (a storage tank for water or cold-plates for refrigeration) and loads controllable by the system controller have been added to the system analysis. From a controls analysis viewpoint, this adds state variables to the system. The result is that the system controller can make operating control decisions on the energy flow between these various system elements to optimize system performance and reduce system cost. The effects on system performance of various control schemes employing these concepts are presented. Analysis of water pumping and/or refrigeration systems show possible performance improvements of greater than 15% with the addition of controllable loads with product storage.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Photovoltaic Specialists Conference; May 12, 1981 - May 15, 1981; Kissimmee, FL
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    NASA TECHNICAL REPORTS
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