Abstract
The combined cycle power plants are the most recognized thermal power plants for their high efficiency, fast start-up capability, and relatively low environmental impact. Moreover, their flexible unit dispatch supports the share of renewable energy, which contributes to carbon mitigation. The operational flexibility of Integrated Solar Combined Cycle (ISCC) power plants is a crucial factor for reliable grid stability. To evaluate the limitations and capabilities of ISCC power plants and their control structures, dynamic simulation is a feasible method. In this study, a sophisticated dynamic process model of the ISCC power plant in Kuraymat, Egypt, has been developed using APROS software. The model describes the plant with a high level of detail including the solar field, the heat recovery steam generator, and the control structures. The model was implemented structurally identical to the reference plant and tuned using the operational design data. Actual measurements were used as the basis for the initialization and validation of the dynamic simulation environment. Dynamic analysis of four different days was performed, then the simulation results were presented and compared with actual measurements. The comparison showed that the course of the actual measurements could be predicted with high accuracy. The solar field influences and the system’s overall power curves are reliably simulated. Consequently, the validated model can simulate the dynamic behavior of the ISCC power plant with a high degree of accuracy, and can be considered in future planning decisions.
Highlights
Electricity demand is growing worldwide faster than any other form of energy consumption as a result of increasing population growth, digitalization, e-mobility and sector coupling
The results showed that the FW flow in the LP circuit decreased during the daytime mode, which could be due to the decrease of available heat in the flue gases (FG) due to the higher mass flow in the HP circuit, and this slight decrease was well represented with the simulation results
All components including the solar field, the heat recovery steam generator (HRSG) and the controlling structures were modeled with the actual specification data from the reference plant
Summary
Electricity demand is growing worldwide faster than any other form of energy consumption as a result of increasing population growth, digitalization, e-mobility and sector coupling. The simulation results such as the electrical power output, the pressure, the temperature, and the mass flow rate were compared with the actual measurements, showing good agreement Such a detailed dynamic validation is not available in the literature. 2. Detailed dynamic validation of the developed model using actual measurements from the reference ISCC power plant. 3. For the first time in the literature, providing more confidence in the dynamic simulation for the design and optimization of ISCC power plants by validating the developed model with actual measurements of four different days. The tuned model was validated again by using actual measurements of four different days by comparing the simulation results of the main parameters (electrical power, pressure, temperature, and mass flow) with their actual measurements. The load of the GT is approximately constant and independent of the operating mode (day/night mode)
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