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Chapter 1 Chapter 5 presents a methodology conceived to help in the definition of the opti- mal design of power generation systems. The innovative element is the integration of requirements on dynamic performance into the procedure. Operational flexi- bility is an increasingly important specification of power systems for base- and part-load operation. Thus, it is crucial to discard, in an early phase of the design process, plant configurations which feature unacceptable dynamic performance. The test case is the preliminary design of an off-grid power plant serving an off-shore platform, where one of the three installed gas turbines is combined with an organic Rankine cycle turbo-generator in order to increase the overall energy efficiency. At the top level of the procedure is a stationary model, capable of performing the on-design thermodynamic cycle calculation, and the design of the main components of the system. The results of these simulations are used within the framework of a multi-objective optimization procedure to identify a number of equally optimal system configurations. A dynamic model of each of these system designs is automatically parameter- ized, by inheriting its parameters values from the optimization results. Dynamic simulations of selected reference transients allow then to discriminate among the initial set of solutions, thus providing the designs that also comply with dynamic requirements. Chapter 6 introduces a new methodology aimed at assessing the potential of optimal control techniques in the context of thermal energy storage management for concentrated solar power (CSP) plants. These systems present the possibility of integrating a thermal energy storage able of sustaining several hours of full- load operation in the absence of solar radiation. However, usually adopted design software tools assume a short-sighted strategy for storage management. The novel design method is applied to a test case, a state-of-the-art central receiver plant with direct storage, using molten salts as working fluid, and operating in a context of variable electricity prices. The system modelling and optimization problems are formulated and imple- mented using modern high-level modelling languages, thus demonstrating the po- tential of the approach. Different operating strategies are compared based on a detailed financial analysis. A wide system design space is considered, and the re- sults are presented for all the foreseeable combinations of solar field size and stor- age system capacity. The proposed method is an additional decision tool allowing to treat the storage operation strategy as a new relevant variable in the design of next generation energy systems. Notably, this could be of particular interest for 6PDF Image | New Concepts FOR Organic Rankine Cycle Power Systems
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