Improving Temperature Tracking Control for Solar Collector Fields Based on Reference Feedforward

Igor M. L. Pataro

doi:10.1109/TCST.2023.3273398

2023-11-01

PRE

Igor M. L. Pataro *

Juan D. Gil

Marcus V. Americano da Costa

Lídia Roca

José Luís Guzmán

Manuel Berenguel

DOI：10.1109/TCST.2023.3273398

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摘要

En 中文

Improving temperature reference tracking in solar collector fields is essential for enhancing the performance of solar thermal plants. Conventional control strategies are usually employed as static reference feedforwards (FFs) to reduce rise time when reference changes occur. Nevertheless, strict performance requirements may demand precise control behavior that classical reference FFs cannot deliver. Therefore, from theoretical analysis, this work proposes two different control strategies based on reference FF structure to accomplish a low rise time and avoid producing overshoot for temperature reference tracking, namely, a lead-lag and a nonlinear reference FF. The structures are studied for suitable implementation, assuming an adaptive control framework to keep the same control performance under different operating conditions. Simulation experiments are developed to investigate and compare the proposed strategies with the conventional static FF with and without a reference filter. Furthermore, the proposed strategies are successfully tested in an actual solar plant AQUASOL-II, located in the Plataforma Solar de Almeria (PSA), Almeria, Spain. The promising results have concluded that the lead-lag and nonlinear reference FF associated with the adaptive structure have attended the proposed control requirements of low rise time and no overshoot. Moreover, the results have demonstrated the compromise between the lead-lag and the nonlinear controller, where the final choice should be made as a tradeoff between performance and control effort.

Keyword:

Tuning

Temperature control

Lead

Process control

Feedforward systems

Adaptation models

Nonlinear dynamical systems

Proportional-integral-derivative (PID) controller

reference feedforward (FF)

reference tracking

solar energy