458861 Model Predictive Control of Solar Thermal System with Borehole Seasonal Storage

Wednesday, November 16, 2016: 10:36 AM
Carmel II (Hotel Nikko San Francisco)
Qingqing Xu, Department of Chemical and Material Engineering, University of Alberta, Edmonton, AB, Canada and Stevan Dubljevic, Chemical and Materials Engineering, University of Alberta, Edmonton, AB, Canada

This work addresses the model predictive controller design for a complex solar boreal-thermal storage system. A solar thermal power plant is used for heating dis- trict houses with bore- hole seasonal energy storage. The modelling of the overall system is inspired by the Drake Landing Solar Community in Okotoks, Alberta, Canada [1]. In this work, the discrete model of the integrated energy system is ob- tained by using energy preserving Cayley-Tustin discretization [2]. As the energy output from the solar thermal plant with borehole seasonal storage varies, the control system maintains the system achieving a desired thermal comfort level and energy savings. The model predictive control is designed by utilizing standard constrained optimization obtained control law which leads to quadratic regulator design account- ing for input or/and state/output constraints [3]. Finally, the controller performance is assessed by a numerical simulation with consideration of various possible scenarios. In addition, the proposed model development and constrained optimization regula- tion successful without approximations can account for the long range behaviour and variability in environmental and/or economic conditions associated with the overall operational costs of entire solar thermal community.

Highlights

1. Solar Thermal System with Borehole Seasonal Storage

2. Cayley-Tustin Discretization

3. Model Predictive Control

References

  1. [1] B. Sibbitt, D. McClenahan, R. Djebbar, J. Thornton, B. Wong, J. Carriere, J. Kokko, The performance of a high solar fraction seasonal storage district heat- ing system–five years of operation, Energy Procedia 30 (2012) 856–865.

  2. [2] V. Havu, J. Malinen, The Cayley transform as a time discretization scheme, Nu- merical Functional Analysis and Optimization 28 (7-8) (2007) 825–851.

  3. [3] K. R. Muske, J. B. Rawlings, Model predictive control with linear models, AIChE Journal 39 (2) (1993) 262–287.


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