Modeling and control of a Linear Fresnel Reflector for an Integrated Solar Combined Cycle

This paper presents a dynamic model of a Linear Fresnel Reflector (LFR) used to describe the evolution of the output steam enthalpy and the control strategy that was developed to allow coupling with Combined Cycle Power Plants (CCPP) while respecting operational constraints. The modeling approach uses the principle of a moving boundary formulation of a two-phase flow region and results in a nonlinear finite dimensional state space description. In order to circumvent the problem of nonlinearities, a simple linearization-based approach is proposed, providing accurate simulation results. Simulations illustrating tracking performances compatible with the CCPP coupling, as well as good (solar) disturbance rejection are shown.