Optimal Operation of Multireservoir Systems Using an Aggregation-Decomposition Approach

Duran, H.; Puech, C.; Díaz, J. Álvarez; Sanchez, G.

doi:10.1109/tpas.1985.318785

Cited by 31 publications

(4 citation statements)

References 5 publications

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“…Lower and upper bounds on variables, expressed by constraints (4)- (6), are imposed by the physical operational constraints of the hydro plant, as well as other constraints associated with the multiple uses of water, such as irrigation, navigation, and flood control.…”

Section: Problem Formulationmentioning

confidence: 99%

Comparison between closed-loop and partial open-loop feedback control policies in long term hydrothermal scheduling

Martínez

Soares

2002

IEEE Trans. Power Syst.

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Stochastic dynamic programming has been extensively used in the optimization of long term hydrothermal scheduling problems due to its ability to cope with the nonlinear and stochastic characteristics of such problems, and the fact that it provides a closed-loop feedback control policy. Its computational requirements, however, tend to be heavy even for systems with a small number of hydroplants, requiring some sort of modeling manipulation in order to be able to handle real systems. An alternative to closed-loop optimization is an approach that combines a deterministic optimization model with an inflow forecasting model in a partial open-loop feedback control framework. At each stage in this control policy, a forecast of the inflows during the period of planning is made, and an operational decision for the following stage is obtained by a deterministic optimization model. The present paper compares such closed-loop and partial open-loop feedback control policies in long term hydrothermal scheduling, using a single hydroplant system as a case study to focus the comparison on the feedback control performance. The comparison is made by simulation using data from historical and synthetical inflow sequences in the consideration of three different Brazilian hydroplants located in different river basins. Results have demonstrated that the performance of the partial open-loop feedback control policy is similar to that of the closed-loop control policy, and is even superior in dry streamflow periods.

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Section: Problem Formulationmentioning

confidence: 99%

Comparison between closed-loop and partial open-loop feedback control policies in long term hydrothermal scheduling

Martínez

Soares

2002

IEEE Trans. Power Syst.

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“…The problem of the planning is very complex due to several aspects, such as: the stochasticity of the water inflows and of the electric power market; the hydraulic interconnection of the hydroelectric plants in a cascade; the nonlinear operational characteristics of hydroelectric and thermoelectric plants; the dynamic relationship among the operation decisions taken along the whole horizon; and the transmission constraints of the electric system [1], [2], [3], [4].…”

Section: Introductionmentioning

confidence: 99%

An approach based on Takagi-Sugeno Fuzzy Inference System applied to the operation planning of hydrothermal systems

Rabelo

Fernandes

Carneiro

et al. 2011

2011 IEEE International Conference on Fuzzy Systems (FUZZ-IEEE 2011)

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The operation planning in hydrothermal systems with great hydraulic participation, as it is the case of Brazilian system, seeks to determine an operation policy to specify how hydroelectric plants should be operated, in order to use the hydroelectric resources economically and reliably. This paper presents an application of Takagi-Sugeno Fuzzy Inference Systems to obtain an operation policy (PBFIS -Policy Based on Fuzzy Inference Systems) that follows the principles of the optimized operation of reservoirs for electric power generation. PBFIS is obtained through the application of an optimization algorithm for the operation of hydroelectric plants. From this optimization the relationships between the stored energy of the system and the volume of the reservoir of each plant are extracted. These relationships are represented in the consequent parameters of the fuzzy linguistic rules. Thus, PBFIS is used to estimate the operative volume of each hydroelectric plant, based on the value of the energy stored in the system. In order to verify the effectiveness of PBFIS, a computer simulation model of the operation of hydroelectric plants was used so as to compare it with the operation policy in parallel; with the operation policy based on functional approximations; and also with the result obtained through the application of the optimization of individualized plants' operation. With the proposed methodology, we try to demonstrate the viability of PBFIS' obtainment and application, and with the obtained results, we intend to illustrate the effectiveness and the gains which came from it.

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“…Em sistemas hidrotérmicos com grande participação de geração hidroelétrica, comoé o caso do sistema brasileiro, o planejamento da operação visa estabelecer regras de operação para os reservatórios de forma a substituir, na medida do possível, a geração de origem termoelétrica por geração de origem hidroelétrica [1,2]. Devidoàs suas características peculiares, o planejamento da operação do sistema hidrotérmico brasileiro pode ser classificado como um problema acoplado no tempo e no espaço, não linear, não convexo, estocástico e de grande porte [3][4][5][6][7][8].…”

Section: Introductionunclassified

Uma Aplicação de Sistemas Fuzzy Genéticos para o Planejamento da Operação Energética de Sistemas Hidrotérmicos

Rabêlo¹,

Borges²,

Fernandes³

2011

L&NLM

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Este trabalho propõe a implementação de regras de operação de reservatórios por meio de Sistemas Fuzzy Genéticos.Sistemas de inferência fuzzy de Mamdani são empregados para estimar o volume operativo de cada usina hidroelétrica, a partir do valor da energia armazenada no sistema hidroelétrico. Para isto, especializa-se um sistema fuzzy para cada usina hidroelétrica, de forma a representar o comportamento diferenciado de cada reservatório na operação otimizada do sistema. Algoritmos Genéticos são utilizados para sintonizar as funções de pertinência da variável linguística do consequente das regras de produção dos sistemas fuzzy. A regra de operação de reservatório proposta, baseada em sistemas fuzzy genéticos (ROBSFG), foi aplicada e comparada, por meio da simulação da operação energética de sistemas hidroelétricos, com a regra de operação paralela (ROP), muito utilizada na prática inclusive em modelos do setor elétrico brasileiro, a regra de operação baseada em funções matemáticas (ROBFM) e a regra de operação baseada em sistemas fuzzy Takagi-Sugeno (ROSFTS). Os resultados obtidos ilustram a eficiência da regra proposta, a qual maximiza os benefícios hidroelétricos do sistema hidrotérmico de geração.

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Optimal Operation of Multireservoir Systems Using an Aggregation-Decomposition Approach

Cited by 31 publications

References 5 publications

Comparison between closed-loop and partial open-loop feedback control policies in long term hydrothermal scheduling

Comparison between closed-loop and partial open-loop feedback control policies in long term hydrothermal scheduling

An approach based on Takagi-Sugeno Fuzzy Inference System applied to the operation planning of hydrothermal systems

Uma Aplicação de Sistemas Fuzzy Genéticos para o Planejamento da Operação Energética de Sistemas Hidrotérmicos

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