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Pump-storage optimization with renewable energy production in water supply systems
The need for saving energy has become one of the world's main concerns over the last years and it will become more important in a near future. New strategies must be developed and implemented in the major energy consumption systems like those for water supply. With pump storage systems is possible to store energy at a lower price since water is pumped to an upper reservoir during off-peak hours. During peak hours hydropower energy can be produced by release of water to the lower reservoir through a water turbine. The combination of these systems with wind turbines can bring many advantages since the energy production by wind sometimes exceeds the electricity consumption needs. In this way, the excess of energy generated by wind turbines can be used to pump water. This paper presents an optimization model that determines the best hourly operation for one day, according to the electricity tariff, for a pumped storage system with water consumption and inlet discharge. A wind turbine is introduced in the system and the optimization model is applied. The rules obtained as output of the optimization process are subsequently introduced in a hydraulic simulator, in order to verify the system behaviour and compare it with the normal water supply operating mode, as well as to quantify the real energy costs savings with this hybrid solution. The developed optimization models (in MATLAB) use linear and non linear programming to provide the best solution in terms of pump and turbine operation for each time step. Simultaneously the population water consumption must be guaranteed, and the hydraulic system restrictions fulfilled. The definition of optimal pumping schedules allows the reduction of operation and maintenance costs associated with pumping energy as well as the increase of global hydraulic system performance. The analysis of results shows that nonlinear programming has a non negligible economic saving. With the introduction of the wind turbines, the profits are further significant.
Pump-storage optimization with renewable energy production in water supply systems
The need for saving energy has become one of the world's main concerns over the last years and it will become more important in a near future. New strategies must be developed and implemented in the major energy consumption systems like those for water supply. With pump storage systems is possible to store energy at a lower price since water is pumped to an upper reservoir during off-peak hours. During peak hours hydropower energy can be produced by release of water to the lower reservoir through a water turbine. The combination of these systems with wind turbines can bring many advantages since the energy production by wind sometimes exceeds the electricity consumption needs. In this way, the excess of energy generated by wind turbines can be used to pump water. This paper presents an optimization model that determines the best hourly operation for one day, according to the electricity tariff, for a pumped storage system with water consumption and inlet discharge. A wind turbine is introduced in the system and the optimization model is applied. The rules obtained as output of the optimization process are subsequently introduced in a hydraulic simulator, in order to verify the system behaviour and compare it with the normal water supply operating mode, as well as to quantify the real energy costs savings with this hybrid solution. The developed optimization models (in MATLAB) use linear and non linear programming to provide the best solution in terms of pump and turbine operation for each time step. Simultaneously the population water consumption must be guaranteed, and the hydraulic system restrictions fulfilled. The definition of optimal pumping schedules allows the reduction of operation and maintenance costs associated with pumping energy as well as the increase of global hydraulic system performance. The analysis of results shows that nonlinear programming has a non negligible economic saving. With the introduction of the wind turbines, the profits are further significant.
Pump-storage optimization with renewable energy production in water supply systems
Optimieren der Pumpspeicherung mit Gewinnung erneuerbarer Energie in einem Wasserversorgungssystem
Vieira, F. (author) / Ramos, H.M. (author) / Covas, D.I.C. (author) / Almeida, A.B. (author)
2008
14 Seiten, 9 Quellen
Conference paper
English
Generator (elektrische Maschine) , lineare Programmierung , Instandhaltung , Betriebskosten , erneuerbare Energie , Staubecken , Wasserwirtschaft , Wasserversorgung , Windturbine , Stromverbrauch , Energieverbrauch , Energiekosten , Betriebsart , Systemeigenschaft , Wasserverbrauch , Wasserturbine , statistisches Verfahren , Optimierungsalgorithmus , Windenergie , Energiegewinnung , elektrische Energieerzeugung , Wasserkraftwerk , Pumpspeicherwerk , Spitzenlastdeckung , Energiespeicher , Optimierung , Modellsimulation , Kosteneinsparung , Trinkwasser , nichtlineare Programmierung
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