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Control-oriented modeling of geothermal borefield thermal dynamics through Hammerstein-Wiener models
Renewable Energy ( IF 8.7 ) Pub Date : 2018-05-01 , DOI: 10.1016/j.renene.2017.12.105
Ercan Atam , Daniel Otto Schulte , Alessia Arteconi , Ingo Sass , Lieve Helsen

Geothermal energy is considered a clean and sustainable form of renewable energy, that can be exploited directly or indirectly by means of specific devices. Ground-coupled heat pumps are widely used systems to obtain this energy. Control of ground-coupled heat pump systems, where thermal energy is extracted or injected from and to a geothermal borefield, is important for optimal geothermal energy use in the building sector and smart grids. Model-based control of such systems is potentially an optimal solution but this requires control-oriented models for the borefield thermal dynamics, which is quite complicated due to thermal interactions between the boreholes, large-scale nonlinear system dynamics, transient surface boundary conditions, etc. In this paper, we propose and demonstrate the successful identification of these complex dynamics through simple and well-structured nonlinear Hammerstein-Wiener models, which can be used in some advanced convex model-based control algorithms. The results are validated for different borefield configurations and parameters with reference to a detailed finite-element borefield thermal model. Finally, a set of advanced convex model-based control methods are shortly described where Hammerstein-Wiener models can be used as control models.

中文翻译:

通过 Hammerstein-Wiener 模型对地热井场热动力学进行面向控制的建模

地热能被认为是一种清洁和可持续的可再生能源,可以通过特定设备直接或间接利用。地耦合热泵是获得这种能量的广泛使用的系统。地面耦合热泵系统的控制(从地热井田提取或注入热能)对于建筑部门和智能电网中的最佳地热能利用非常重要。这种系统的基于模型的控制可能是一个最佳解决方案,但这需要面向控制的井场热动力学模型,由于井眼之间的热相互作用、大规模非线性系统动力学、瞬态表面边界条件等,该模型非常复杂。 在本文中,我们通过简单且结构良好的非线性 Hammerstein-Wiener 模型提出并证明了这些复杂动力学的成功识别,该模型可用于一些基于凸模型的高级控制算法。参考详细的有限元井场热模型,对不同井场配置和参数的结果进行了验证。最后,简要介绍了一组先进的基于凸模型的控制方法,其中 Hammerstein-Wiener 模型可用作控制模型。
更新日期:2018-05-01
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