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A control based on a knapsack problem for solar hydrogen production

机译：基于背包问题的太阳能制氢控制

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The Hydrosol pilot plant was installed in the small solar power systems solar tower at CIEMAT-Plataforma Solar de Almeria (PSA), Spain, for producing solar hydrogen from water using a ferrite-based redox technology. It consists of two reactors where hydrogen and oxygen production cycles are alternated for quasi-continuous hydrogen production. In the first step (water splitting), an exothermic reaction takes place at an operating temperature of 800?. The second step (thermal reduction) is an endothermic reaction, which requires an operating temperature of 1200?. Recently, an adaptive control strategy for controlling these operating temperatures in the solar hydrogen reactor has been proposed and implemented, using the number of heliostats focused as the control signal. The algorithm chooses which heliostats have to be focused estimating the concentrated solar power contribution of each heliostat. Then, the heliostats are focused, starting from those which provide lower power. This paper is based on this control strategy, but considering a new algorithm to choose the heliostats. Using the concentrated solar power contributions, a knapsack problem is defined to obtain a local optimal solution, which provides a set of heliostats that minimizes the error between the setpoint and the reactor concentrated solar power. In order to evaluate the performance of this method, simulation and experimental results are shown and discussed. Copyright (c) 2014 John Wiley & Sons, Ltd.
机译：Hydrosol中试装置安装在西班牙CIEMAT-Plataforma Solar de Almeria（PSA）的小型太阳能发电系统的太阳能塔中，用于使用基于铁氧体的氧化还原技术从水中生产太阳能氢。它由两个反应器组成，其中氢气和氧气的生产周期交替进行，以准连续的方式生产氢气。在第一步（水分解）中，放热反应在800℃的操作温度下发生。第二步（热还原）是吸热反应，它需要1200℃的操作温度。最近，已经提出并实施了一种用于控制太阳能氢反应器中的这些工作温度的自适应控制策略，该方法使用定日镜的数量作为控制信号。该算法选择必须集中哪些定日镜来估计每个定日镜的集中太阳能贡献。然后，从提供较低功率的定日镜开始聚焦定日镜。本文基于这种控制策略，但考虑了一种选择定日镜的新算法。利用集中的太阳能贡献，定义了背包问题以获得局部最优解，其提供了一组定日镜，该定日镜使设定点和反应堆集中太阳能之间的误差最小。为了评估该方法的性能，显示并讨论了仿真和实验结果。版权所有（c）2014 John Wiley＆Sons，Ltd.

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