FRRo - I+D+i - Artículos en Revistas

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    A strategy for the economic optimization of combined cycle gas turbine power plants by taking advantage of useful thermodynamic relationships
    (Elsevier, 2010-11-01) Godoy, Ezequiel; Benz, Sonia Judith; Scenna, Nicolás José
    Optimal combined cycle gas turbine power plants characterized by minimum specific annual cost values are here determined for wide ranges of market conditions as given by the relative weights of capital investment and operative costs, by means of a nonlinear mathematical programming model. On the other hand, as the technical optimization allows identifying trends in the system behavior and unveiling optimization opportunities, selected functional relationships are obtained as the thermodynamic optimal values of the decision variables are systematically linked to the ratio between the total heat transfer area and the net power production (here named as specific transfer area). A strategy for simplifying the resolution of the rigorous economic optimization problem of power plants is proposed based on the economic optima distinctive characteristics which describe the behavior of the decision variables of the power plant on its optima. Such approach results in a novel mathematical formulation shaped as a system of nonlinear equations and additional constraints that is able to easily provide accurate estimations of the optimal values of the power plant design and operative variables.
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    An optimization model for evaluating the economic impact of availability and maintenance notions during the synthesis and design of a power plant
    (Elsevier, 2017-01-27) Godoy, Ezequiel; Benz, Sonia Judith; Scenna, Nicolás José
    In this paper, we introduce an optimization strategy in order to comprehensively quantify the impact of availability and maintenance notions during the early stages of synthesis and design of a new natural gas combined cycle power plant. A detailed state-space approach is thoroughly discussed, where influence of maintenance funds on each component’s repair rate is directly assessed. In this context, analysis of the reliability characteristics of the system is centered at two designer-adopted parameters, which largely influence the obtained results: the number of components which may fail independently at the same time, and the number of simultaneous failure/repair events. Then, optimal solutions are evaluated as the availability-related parameters and the amount of resources assigned for maintenance actions are varied across a wide range of feasible values, which enable obtaining more accurate and detailed estimations of the expected economic performance for the project when compared with traditional economic evaluation approaches.
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    Families of optimal thermodynamic solutions for combined cycle gas turbine (CCGT) power plants
    (Elsevier, 2009-10-30) Godoy, Ezequiel; Scenna, Nicolás José; Benz, Sonia Judith
    Optimal designs of a CCGT power plant characterized by maximum second law efficiency values are determined for a wide range of power demands and different values of the available heat transfer area. These thermodynamic optimal solutions are found within a feasible operation region by means of a nonlinear mathematical programming (NLP) model, where decision variables (i.e. transfer areas, power production, mass flow rates, temperatures and pressures) can vary freely. Technical relationships among them are used to systematize optimal values of design and operative variables of a CCGT power plant into optimal solution sets, named here as optimal solution families. From an operative and design point of view, the families of optimal solutions let knowing in advance optimal values of the CCGT variables when facing changes of power demand or adjusting the design to an available heat transfer area.
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    Impacto de nociones de disponibilidad en la evaluación económica de proyectos de generación óptimos
    (Federal University of Santa Catarina, 2013-10-01) Godoy, Ezequiel; Martin, Victor; Benz, Sonia Judith
    El presente trabajo tiene por objetivo estudiar el impacto de considerar distintas nociones de disponibilidad durante la formulación del proyecto de inversión de una planta de generación por ciclo combinado. En primer lugar, se propone una estrategia para determinar el horizonte operativo equivalente del sistema, que incluye el cómputo de las erogaciones en que se incurren debido a la operación en todo el conjunto de estados degradados que la planta atraviesa a lo largo de su vida útil. En segundo lugar, se propone incluir una funcionalidad entre disponibilidad y recursos asignados para mantenimiento, con objeto de asegurar que se podrá alcanzar la meta de generación fijada frente a las cambiantes condiciones que la planta debe afrontar. Luego, se analizan las mejoras obtenidas en los indicadores económicos óptimos del proyecto, observándose un incremento del atractivo de las opciones de inversión generadas desde las etapas tempranas de diseño de la planta.
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    Optimal economic strategy for the multiperiod design and long-term operation of natural gas combined cycle power plants.
    (Elsevier, 2012-08-25) Godoy, Ezequiel; Scenna, Nicolás José; Benz, Sonia Judith
    Optimal power plant designs are achieved by means of a proposed multiperiod non-linear programming formulation that utilizes the net present value as objective function, while construction, operation and dismantling of the generation facility are accounted for. In addition, optimal operative characteristics are also established for each operative time period, in a way that the system constraints are always satisfied. Based on the life cycle oriented economic optimal characteristics, a reduced model is proposed as strategy for simplifying the resolution of the rigorous multiperiod model. Trends in the system behavior are identified, enabling the reduction of the multiperiod formulation into a system of non-linear equations plus additional constraints, which allows easily computing accurate estimations of the optimal values of the design variables as well as the time-dependent operative variables.
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    Optimal life cycle oriented design of a GT + 1PSH HRSG type CCGT power plant.
    (2010) Godoy, Ezequiel; Benz, Sonia Judith; Scenna, Nicolás José
    In the present work, a life cycle oriented approach is used for designing power plants in a way they can satisfy the desired demand along the whole time horizon, while a selected performance indicator of the project is optimized. As case study, optimal design characteristics as well as optimal values of long term operation parameters of a GT + 1PSH HRSG Type CCGT power plant (GT: gas turbine, 1PSH HRSG: 1 pressure with superheater-heat recovery steam generator, CCGT: combined cycle gas turbine) are obtained by means of a multiperiod mathematical model, seeing that the selected performance indicator is maximized. In addition, advantages of the life cycle oriented approach results are discussed when compared with a power plant design obtained by traditional methods.