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• W2598272867 abstract "Concentrated Solar Power (CSP) is a utility scale technology that produces electricity using the thermal energy of the sun. Due to the varying intensity of the solar irradiation, there is a constant change in the operation point for solar thermal power plants. In order to optimize the process, a complex relation between irradiation intensity, fluid mass flow and collector focus must be considered and appropriate control strategies should take into account the transient situations. Therefore, detailed simulation tools are essential for the analysis and optimized operation of the power plant.In this context, the German Aerospace Centre (DLR), as a pioneering research institution of CSP, developed a model to simulate line-focus solar fields with single-phase heat transfer medium: the Virtual Solar Field (VSF). This simulation tool considers the hydraulic and thermal aspectsof the plant, enabling to model the thermal condition effect of the field on the flow distribution among the parallel loops. Accordingly, the goal of the master thesis is to validate VSF under certain conditions and improveits applications. In addition, VSF is also used as a tool to enhance the control and improve the outcome of solar thermal power plants. The first phase of the project consisted of the validation of the simulation tool by the comparison of the VSF model results with data from areal power plant. For that, data preparation was realized and a Validation method was developed, with further analysis of the results. The second phase of the project was based on the development of a broader use for thetool as an improvement for control. This was achieved by the application of a Fuzzy Logic Control (FLC). This FLC implementation includes loop mass flow and collector focusing mode in the same algorithm, aiming to decrease defocusing instances while still maintaining optimal temperature set-points. It considers control valves for eachindividual loop and also the period of the day, differentiating the phases of plant operation. The main advantage brought from fuzzy logic to this case is that the knowledge in the technology and in the expected behaviorin transient situations could be fully applied in the control strategy. Consequently, VSF was successfully validated and used as a good support for the development of FLC. The results of FLC application Show that this unique approach can be very beneficial for the plant's operation,with a relative simple implementation. FLC performed as a robust and proactive controller, especially in transient situations, providing better energy performance and allowing less defocusing instances, with stableoutlet fluid temperature. In conclusion, the FLC is considered to be a proper strategy to be applied in combination with VSF simulation tool to enhance the control of a solar thermal power plant. This implementationrepresents an additional value for VSF, characterizing an innovative approach that considers dynamic valve control and collector focusing mode in a single strategy." @default.
• W2598272867 created "2017-04-07" @default.
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• W2598272867 date "2016-09-14" @default.
• W2598272867 modified "2023-09-27" @default.
• W2598272867 title "Transient Simulation of Line-Focus Solar Thermal Power Plants" @default.
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