Optimal dispatch of generating units of the Itaipu hydroelectric plant

Arce, A.; Ohishi, Takaaki; Soares, S.

doi:10.1109/59.982207

Cited by 160 publications

(61 citation statements)

References 5 publications

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“…Los caudales se optimizan tomando en cuenta la semejanza dinámica de cada turbina a altura de diseño, esto es a igualdad de cifra de presión y cifra de caudal. Existen otras metodologías alternativas para casos específicos [5,6,7].…”

Section: Metodologiaunclassified

Maximización de la eficiencia a cargas parciales de una central hidroeléctrica multigrupo integrada al sistema interconectado nacional

Chávez

Maximiliano

Coquil³

2015

TEC

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Section: Metodologiaunclassified

Maximización de la eficiencia a cargas parciales de una central hidroeléctrica multigrupo integrada al sistema interconectado nacional

Chávez

Maximiliano

Coquil³

2015

TEC

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“…varies abruptly in short times, mainly due to the plant turbined outflow, Q, given by the addition of the outflows of all the units composing the plant. For some power plant configurations, fcj also varies with the reservoir spillage, s. In (2), the term k j q 2 j represents hydraulic losses resulting from friction of the water in penstock, where k j is a constant expressed in s 2 /m 5 [11].…”

Section: Hydro Generating Unitsmentioning

confidence: 99%

Solving the unit commitment problem of hydropower plants via Lagrangian Relaxation and Sequential Quadratic Programming

Finardi¹,

Silva²,

Sagastizábal³

2005

Mat. apl. comput.

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Abstract.We consider the optimal scheduling of hydropower plants in a hydrothermal interconnected system. This problem, of outmost importance for large-scale power systems with a high proportion of hydraulic generation, requires a detailed description of the so-called hydro unit production function. In our model, we relate the amount of generated hydropower to nonlinear tailrace levels; we also take into account hydraulic losses, turbine-generator efficiencies, as well as multiple 0-1 states associated with forbidden operation zones. Forbidden zones are crucial to avoid nasty phenomena such as mechanical vibrations in the turbine, cavitation, and low efficiency levels. The minimization of operating costs subject to such detailed constraints results in a large-scale mixed-integer nonlinear programming problem. By means of Lagrangian Relaxation, the original problem is split into a sequence of smaller and easy-to-solve subproblems, coordinated by a dual master program. In order to deal better with the combinatorial aspect introduced by the forbidden zones, we derive three different decomposition strategies, applicable to various configurations of hydro plants (with few or many units, which can be identical or different). We use a Sequential Quadratic Programming algorithm to solve nonlinear subproblems. We assess our approach on a real-life hydroelectric configuration extracted from the south sub region of the Brazilian hydrothermal power system.

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“…Recent studies [14,15] have shown that interest on this technique is still relevant. Although it can easily overcome the nonlinear and nonconcave character of the hydro scheduling problem, it poses difficulties to manage the unit start-ups and shut-downs.…”

Section: Introductionmentioning

confidence: 99%

Unit commitment and generation dispatch of a hydropower plant in a competitive electricity market

Pérez¹,

Wilhelmi²,

Arévalo³

2008

REPQJ

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Abstract. This paper presents a model to solve the short-term scheduling problem of a hydropower plant in a deregulated system, based on dynamic programming techniques. The objective of this model is to maximize the revenue obtained by selling energy in a competitive electricity market. The time horizon of the model is divided into hourly periods and ranges from one day to one week. The proposed model determines both the unit commitment and the power to be generated in each hour of the time horizon. The power is considered as a nonlinear function of the water discharge and the reservoir volume; the dependence of the units and plant operating limits on the available gross head has been taken into account; and the water discharged through the spillway has been also allowed for in the model. This approach has been applied to a practical case study, the results of which are analyzed in detail.

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Optimal dispatch of generating units of the Itaipu hydroelectric plant

Cited by 160 publications

References 5 publications

Maximización de la eficiencia a cargas parciales de una central hidroeléctrica multigrupo integrada al sistema interconectado nacional

Maximización de la eficiencia a cargas parciales de una central hidroeléctrica multigrupo integrada al sistema interconectado nacional

Solving the unit commitment problem of hydropower plants via Lagrangian Relaxation and Sequential Quadratic Programming

Unit commitment and generation dispatch of a hydropower plant in a competitive electricity market

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