The Experts below are selected from a list of 111 Experts worldwide ranked by ideXlab platform
Tomonobu Senjyu - One of the best experts on this subject based on the ideXlab platform.
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Optimal Thermal Unit Commitment for Solving Duck Curve Problem by Introducing CSP, PSH and Demand Response
IEEE Access, 2018Co-Authors: Harun Or Rashid Howlader, Mohammad Masih Sediqi, Abdul Matin Ibrahimi, Tomonobu SenjyuAbstract:Nowadays, the installations of photovoltaics (PVs) in the smart grid have been growing dramatically because the price of PVs is falling drastically. Undoubtedly, this is a great achievement for the recent smart grid technology. However, the colossal penetration of PVs' power at the day-time changes the load demand of thermal generations (TGs) of a smart grid which creates duck shape load curve called duck curve. In a duck curve, peak and off-peak gaps are very large which increase the start-up cost (SUC) of TGs because the units of TGs must be turned ON and turned OFF frequently. Therefore, it is very significant to run TGs units optimally. Only an optimization technique is not enough to bring a good solution. This research considers concentrated solar power and pumped storage Hydroelectricity (PSH) as the energy storages. Also, fuel cells are considered as the controllable loads in the demand side's smart houses. In addition, this paper considers the real-time price-based demand response. The optimal unit commitment (UC) of TGs, PSHs, and other generators is introduced for saving the fuel cost and SUC of TGs. The optimal results of the proposed model are determined by using MATLAB® INTLINPROG optimization toolbox. To evaluate the effectiveness of the proposed method, simulation results have been compared with some other methods.
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Duck curve problem solving strategies with thermal unit commitment by introducing pumped storage Hydroelectricity & renewable energy
2017 IEEE 12th International Conference on Power Electronics and Drive Systems (PEDS), 2017Co-Authors: Harun Or Rashid Howlader, Masahiro Furukakoi, Hidehito Matayoshi, Tomonobu SenjyuAbstract:In recent years, the price of photovoltaic (PV) has been decreasing dramatically, that has been increasing the installation of PVs in smart grid and roof photovoltaic (PVr). There is no doubt, this is a positive development of smart grid for the world. As we know every good thing has a bad side too, PVs definitely generate power in the day time, so huge number of PV's power penetration in the daytime changes the load demand of fossils fuel based thermal generations and load curve becomes duck shape. In duck curve, peak and off-peak gap is very large. It is a challenge to cut the peak and increase the off-peak load which means load leveling is very important. If peak and off-peak gap are more so start-up cost (SUC) of thermal generators will be more. Besides, more thermal units have to be run to fulfill the peak load. Therefore, it is very important to run thermal units optimally. As we already knew, duck curve has very high peak so the only optimization is not enough to bring good results. Therefore, energy storage system plays a vital role to level peak and off-peak load. However, battery energy system (BESS), still installation cost is very high specially NaS battery. That is why in this research considers concentrated solar power (CSP) and pumped storage Hydroelectricity (PSH) as the energy storage system (ESS). In this research, optimal unit commitment (UC) of thermal generators and PSH is introduced for saving the fuel cost and SUC of thermal generators. Optimal results of the proposed research model are determined by using MATLAB® INTLINPROG optimization toolbox.
Alain Dassargues - One of the best experts on this subject based on the ideXlab platform.
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interactions between groundwater and the cavity of an old slate mine used as lower reservoir of an upsh underground pumped storage Hydroelectricity a modelling approach
Engineering Geology, 2017Co-Authors: Sarah Bodeux, Estanislao Pujades, Philippe Orban, Serge Brouyere, Alain DassarguesAbstract:Abstract In the actual evolving energy context, characterized by an increasing part of intermittent renewable sources, the development of energy storage technologies are required, such as pumped storage Hydroelectricity (PSH). While new sites for conventional PSH plants are getting scarce, it is proposed to use abandoned underground mines as lower reservoirs for Underground Pumped Storage Hydroelectricity (UPSH). However, the hydrogeological consequences produced by the cyclic solicitations (continuous pumpings and injections) have been poorly investigated. Therefore, in this work, groundwater interactions with the cyclically fill and empty cavity were numerically studied considering a simplified description of a slate mine. Two pumping/injection scenarios were considered, both for a reference slate rock case and for a sensitivity analysis of variations of aquifer hydraulic conductivity value. Groundwater impacts were assessed in terms of oscillations of piezometric heads and mean drawdown around the cavity. The value of the hydraulic conductivity clearly influences the magnitude of the aquifer response. Studying interactions with the cavity highlighted that seepage into the cavity occurs over time. The volume of seeped water varies depending on the hydraulic conductivity and it could become non-negligible in the UPSH operations. These preliminary results allow finally considering first geological feasibility aspects, which could vary conversely according to the hydraulic conductivity value and to the considered groundwater impacts.
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Underground pumped storage Hydroelectricity using abandoned works (deep mines or open pits) and the impact on groundwater flow
Hydrogeology Journal, 2016Co-Authors: Estanislao Pujades, Sarah Bodeux, Philippe Orban, Thibault Willems, Alain DassarguesAbstract:Des centrales hydroélectriques de pompage-turbinage utilisant un réservoir souterrain (UPSH Underground pumped storage Hydroelectricity) constitué d’une carrière ou d’une mine profonde permettent de stocker l’excès d’électricité produite au cours des périodes de faible demande dans des régions sans relief. Il est essentiel de prendre en considération l’interaction entre les systèmes UPSH et le milieu géologique encaissant. Peu de travail existe concernant l’évaluation des impacts induits sur les écoulements d’eaux souterraines. Ceux-ci sont déterminés numériquement à l’aide d’un modèle numérique simplifié pour lequel on fait l’hypothèse qu’il est représentatif de considérer un puits ouvert de large diamètre. Le principal impact est une oscillation du niveau piézométrique dont l’amplitude dépend des caractéristiques de l’aquifère/milieu géologique, de la mine et des cycles de pompage et d’injection. Si un niveau piézométrique moyen est considéré, celui-ci diminue au début de la mise en activité du système UPSH et puis revient progressivement à son état initial. Les conditions hydrogéologiques les plus favorables pour minimiser les impacts ont été évaluées en comparant plusieurs scénarios. Comme attendu, l’amplitude de l’impact sera la plus faible dans un milieu géologique de faible diffusivité hydraulique. Cependant, le paramètre qui joue le rôle le plus important est le volume d’eau stocké dans la mine. Sa variation modifie de manière considérable les impacts sur les écoulements d’eaux souterraines. Finalement, le problème est étudié de manière analytique et des solutions sont proposées pour évaluer les impacts, permettant un premier tri rapide des sites favorables pour implanter de futures installations UPSH. 在平坦地区可以利用露天矿坑或深矿井建造地下抽水蓄能电站,储存能源需求低的时期多余的电。充分考虑地下抽水蓄能电站和周围地质介质的相互作用必不可少。过去几乎没有对相关的地下水流影响做过评价。利用一个假定能够代表露天矿坑和深矿井的简化数值模型确定了对地下水流的影响。主要影响包括测压水头的振荡,其幅度取决于含水层/地质介质的特征、矿井和抽水注水的间隔。如果考虑平均测压水头,测压水头在地下抽水蓄能电站运行开始后初期下降,然后逐渐恢复。通过比较不同的几个方案,评价了使影响达到最小的最有利水文地质条件。水利扩散系数低的地质介质影响幅度较低。然而,发挥重要作用的参数是矿井储存水量。其变化可大大更改对地下水流的影响。最后,分析研究了出现的问题,提出了粗略估算影响的解决方法,可使人们对未来的地下抽水蓄能电站有利位置做出快速筛选. Underground pumped storage Hydroelectricity (UPSH) plants using open-pit or deep mines can be used in flat regions to store the excess of electricity produced during low-demand energy periods. It is essential to consider the interaction between UPSH plants and the surrounding geological media. There has been little work on the assessment of associated groundwater flow impacts. The impacts on groundwater flow are determined numerically using a simplified numerical model which is assumed to be representative of open-pit and deep mines. The main impact consists of oscillation of the piezometric head, and its magnitude depends on the characteristics of the aquifer/geological medium, the mine and the pumping and injection intervals. If an average piezometric head is considered, it drops at early times after the start of the UPSH plant activity and then recovers progressively. The most favorable hydrogeological conditions to minimize impacts are evaluated by comparing several scenarios. The impact magnitude will be lower in geological media with low hydraulic diffusivity; however, the parameter that plays the more important role is the volume of water stored in the mine. Its variation modifies considerably the groundwater flow impacts. Finally, the problem is studied analytically and some solutions are proposed to approximate the impacts, allowing a quick screening of favorable locations for future UPSH plants. Las centrales hidroeléctricas reversibles utilizando un embalse subterráneo (UPSH Underground Pumped Storage Hydroelectricity) formado por una mina a cielo abierto o subterránea permiten almacenar el exceso de electricidad producida durante períodos de baja demanda en regiones llanas. Es esencial tener en cuenta la interacción entre los sistemas UPSH y el medio geológico circundante. Existen pocos trabajos acerca de la evaluación de los impactos sobre el agua subterránea. Estos son determinados numéricamente utilizando un modelo simplificado que se supone representativo de minas subterráneas y a cielo abierto. El principal impacto consiste en la oscilación del nivel piezométrico, y su magnitud depende de las características del acuífero/medio geológico, la mina y los intervalos de bombeo e inyección. Si se considera un nivel piezométrico promedio, este decrece al inicio de la actividad del sistema UPSH y luego recupera progresivamente hasta su estado inicial. Las condiciones hidrogeológicas más favorables para minimizar los impactos son evaluadas comparando varios escenarios. La magnitud del impacto será menor en medios geológicos con baja difusividad hidráulica. Sin embargo, el volumen de agua almacenada en la mina es el parámetro que desempeña el papel más importante. Su variación modifica considerablemente los impactos sobre el flujo de agua subterránea. Por último, el problema se estudia analíticamente y se proponen algunas soluciones para evaluar los impactos. Estas soluciones permiten seleccionar rápidamente los sitios favorables para la construcción de futuras instalaciones UPSH. Usinas hidrelétricas reversíveis subterrâneas (UHRS) utilizando minas a céu aberto ou minas subterrâneas podem ser utilizadas em regiões planas para armazenamento do excedente da energia elétrica produzida durante períodos de baixa demanda energética. É essencial considerar a interação entre as UHRS e o meio geológico do entorno. Poucos estudos têm sido realizados na avaliação dos impactos associados ao fluxo das águas subterrâneas. Os impactos no fluxo das águas subterrâneas são determinados numericamente utilizando modelos numéricos simplificados, considerados representativos para minas a céu aberto e minas subterrâneas. Os principais impactos consistem na oscilação do nível piezométrico, e sua magnitude depende das características do aquífero/meio geológico, da mina e dos intervalos de bombeamento e injeção. Assumindo um nível piezométrico médio, há um declínio que sucede o início das atividades da UHRS, seguido de uma recuperação progressiva. As condições hidrogeológicas mais favoráveis para minimizar os impactos são avaliadas através da comparação de diversos cenários. A magnitude do impacto será inferior em meios geológicos de baixa difusividade hidráulica. Entretanto, o parâmetro que desempenha o papel mais importante é o volume da água armazenada na mina. Sua variação modifica consideravelmente os impactos no fluxo das águas subterrâneas. Por fim, o problema é estudado analiticamente e algumas soluções são propostas para aproximar os impactos, permitindo a rápida triagem de locais favoráveis para futuras UHRS.
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underground pumped storage Hydroelectricity using abandoned works deep mines or open pits and the impact on groundwater flow
Hydrogeology Journal, 2016Co-Authors: Estanislao Pujades, Sarah Bodeux, Philippe Orban, Thibault Willems, Alain DassarguesAbstract:Underground pumped storage Hydroelectricity (UPSH) plants using open-pit or deep mines can be used in flat regions to store the excess of electricity produced during low-demand energy periods. It is essential to consider the interaction between UPSH plants and the surrounding geological media. There has been little work on the assessment of associated groundwater flow impacts. The impacts on groundwater flow are determined numerically using a simplified numerical model which is assumed to be representative of open-pit and deep mines. The main impact consists of oscillation of the piezometric head, and its magnitude depends on the characteristics of the aquifer/geological medium, the mine and the pumping and injection intervals. If an average piezometric head is considered, it drops at early times after the start of the UPSH plant activity and then recovers progressively. The most favorable hydrogeological conditions to minimize impacts are evaluated by comparing several scenarios. The impact magnitude will be lower in geological media with low hydraulic diffusivity; however, the parameter that plays the more important role is the volume of water stored in the mine. Its variation modifies considerably the groundwater flow impacts. Finally, the problem is studied analytically and some solutions are proposed to approximate the impacts, allowing a quick screening of favorable locations for future UPSH plants.
Reza Hemmati - One of the best experts on this subject based on the ideXlab platform.
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Stochastic energy investment in off-grid renewable energy hub for autonomous building
IET Renewable Power Generation, 2019Co-Authors: Reza HemmatiAbstract:This study forms and optimises the renewable energy hub to supply load demand in the autonomous building disconnected from electrical grid (i.e. net-zero energy building). The proposed energy hub is made of hybrid wind-solar-hydro generation systems and it is also strengthened by Pumped-Storage Hydroelectricity and hydrogen storage systems. The hydro system includes two water reservoirs in cascade connection and one Pumped-Storage Hydroelectricity. The introduced optimisation programming designs proper capacity for cascade water reservoirs and energy storage system as well as optimises their operation. The uncertainties of parameters are included to make the stochastic programming. It is demonstrated that increasing the flow-in of reservoir 1 by 25% decreases the planning cost by ~2.5% and decreasing the flow-in of reservoir 2 by 50% increases the planning cost by ~16%. When the hydro system does not operate, the wind power must be increased to 10 kW in order to supply the load. When the wind and solar powers are not integrated, the hydro energy must be increased by 50%.
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Managing Multitype Capacity Resources For Frequency Regulation In Unit Commitment Integrated With Large Wind Ramping
IEEE Transactions on Sustainable Energy, 1Co-Authors: Reza Hemmati, Hasan Mehrjerdi, Miadreza Shafie-khah, Pierluigi Siano, Joao P. S. CatalaoAbstract:An efficient unit commitment planning must consider frequency regulation capacity in the model. Such models are more complicated under a high penetration level of renewable energy because of renewable ramping and uncertainty. This paper addresses these issues in the unit commitment. The proposed model for unit commitment considers uncertainty and ramping of wind power, frequency regulation capacity, spinning reserve, demand response, and Pumped-Storage Hydroelectricity. In order to optimize the costs, the Pumped-Storage Hydroelectricity and demand response program are also included to deal with ramping and uncertainty. The numerical results specify that the arrangement of frequency regulation capacity, Pumped-Storage system and demand response can effectively tackle both the ramping and uncertainty. The system includes 10-generator with total power equal to 1070 MW and one wind generator with 300 MW power. The initial wind integration level is about 28%. It is verified that decreasing the frequency regulation capacity by 10% reduces wind integration level by 94%. The demand response and Pumped-Storage increase wind integration level by 10% and 16%; while both together increase wind integration by 25% compared to the initial level. The wind integration level without large wind ramping can be increased up to 200%
Harun Or Rashid Howlader - One of the best experts on this subject based on the ideXlab platform.
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Optimal Thermal Unit Commitment for Solving Duck Curve Problem by Introducing CSP, PSH and Demand Response
IEEE Access, 2018Co-Authors: Harun Or Rashid Howlader, Mohammad Masih Sediqi, Abdul Matin Ibrahimi, Tomonobu SenjyuAbstract:Nowadays, the installations of photovoltaics (PVs) in the smart grid have been growing dramatically because the price of PVs is falling drastically. Undoubtedly, this is a great achievement for the recent smart grid technology. However, the colossal penetration of PVs' power at the day-time changes the load demand of thermal generations (TGs) of a smart grid which creates duck shape load curve called duck curve. In a duck curve, peak and off-peak gaps are very large which increase the start-up cost (SUC) of TGs because the units of TGs must be turned ON and turned OFF frequently. Therefore, it is very significant to run TGs units optimally. Only an optimization technique is not enough to bring a good solution. This research considers concentrated solar power and pumped storage Hydroelectricity (PSH) as the energy storages. Also, fuel cells are considered as the controllable loads in the demand side's smart houses. In addition, this paper considers the real-time price-based demand response. The optimal unit commitment (UC) of TGs, PSHs, and other generators is introduced for saving the fuel cost and SUC of TGs. The optimal results of the proposed model are determined by using MATLAB® INTLINPROG optimization toolbox. To evaluate the effectiveness of the proposed method, simulation results have been compared with some other methods.
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Duck curve problem solving strategies with thermal unit commitment by introducing pumped storage Hydroelectricity & renewable energy
2017 IEEE 12th International Conference on Power Electronics and Drive Systems (PEDS), 2017Co-Authors: Harun Or Rashid Howlader, Masahiro Furukakoi, Hidehito Matayoshi, Tomonobu SenjyuAbstract:In recent years, the price of photovoltaic (PV) has been decreasing dramatically, that has been increasing the installation of PVs in smart grid and roof photovoltaic (PVr). There is no doubt, this is a positive development of smart grid for the world. As we know every good thing has a bad side too, PVs definitely generate power in the day time, so huge number of PV's power penetration in the daytime changes the load demand of fossils fuel based thermal generations and load curve becomes duck shape. In duck curve, peak and off-peak gap is very large. It is a challenge to cut the peak and increase the off-peak load which means load leveling is very important. If peak and off-peak gap are more so start-up cost (SUC) of thermal generators will be more. Besides, more thermal units have to be run to fulfill the peak load. Therefore, it is very important to run thermal units optimally. As we already knew, duck curve has very high peak so the only optimization is not enough to bring good results. Therefore, energy storage system plays a vital role to level peak and off-peak load. However, battery energy system (BESS), still installation cost is very high specially NaS battery. That is why in this research considers concentrated solar power (CSP) and pumped storage Hydroelectricity (PSH) as the energy storage system (ESS). In this research, optimal unit commitment (UC) of thermal generators and PSH is introduced for saving the fuel cost and SUC of thermal generators. Optimal results of the proposed research model are determined by using MATLAB® INTLINPROG optimization toolbox.
Estanislao Pujades - One of the best experts on this subject based on the ideXlab platform.
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interactions between groundwater and the cavity of an old slate mine used as lower reservoir of an upsh underground pumped storage Hydroelectricity a modelling approach
Engineering Geology, 2017Co-Authors: Sarah Bodeux, Estanislao Pujades, Philippe Orban, Serge Brouyere, Alain DassarguesAbstract:Abstract In the actual evolving energy context, characterized by an increasing part of intermittent renewable sources, the development of energy storage technologies are required, such as pumped storage Hydroelectricity (PSH). While new sites for conventional PSH plants are getting scarce, it is proposed to use abandoned underground mines as lower reservoirs for Underground Pumped Storage Hydroelectricity (UPSH). However, the hydrogeological consequences produced by the cyclic solicitations (continuous pumpings and injections) have been poorly investigated. Therefore, in this work, groundwater interactions with the cyclically fill and empty cavity were numerically studied considering a simplified description of a slate mine. Two pumping/injection scenarios were considered, both for a reference slate rock case and for a sensitivity analysis of variations of aquifer hydraulic conductivity value. Groundwater impacts were assessed in terms of oscillations of piezometric heads and mean drawdown around the cavity. The value of the hydraulic conductivity clearly influences the magnitude of the aquifer response. Studying interactions with the cavity highlighted that seepage into the cavity occurs over time. The volume of seeped water varies depending on the hydraulic conductivity and it could become non-negligible in the UPSH operations. These preliminary results allow finally considering first geological feasibility aspects, which could vary conversely according to the hydraulic conductivity value and to the considered groundwater impacts.
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Underground pumped storage Hydroelectricity using abandoned works (deep mines or open pits) and the impact on groundwater flow
Hydrogeology Journal, 2016Co-Authors: Estanislao Pujades, Sarah Bodeux, Philippe Orban, Thibault Willems, Alain DassarguesAbstract:Des centrales hydroélectriques de pompage-turbinage utilisant un réservoir souterrain (UPSH Underground pumped storage Hydroelectricity) constitué d’une carrière ou d’une mine profonde permettent de stocker l’excès d’électricité produite au cours des périodes de faible demande dans des régions sans relief. Il est essentiel de prendre en considération l’interaction entre les systèmes UPSH et le milieu géologique encaissant. Peu de travail existe concernant l’évaluation des impacts induits sur les écoulements d’eaux souterraines. Ceux-ci sont déterminés numériquement à l’aide d’un modèle numérique simplifié pour lequel on fait l’hypothèse qu’il est représentatif de considérer un puits ouvert de large diamètre. Le principal impact est une oscillation du niveau piézométrique dont l’amplitude dépend des caractéristiques de l’aquifère/milieu géologique, de la mine et des cycles de pompage et d’injection. Si un niveau piézométrique moyen est considéré, celui-ci diminue au début de la mise en activité du système UPSH et puis revient progressivement à son état initial. Les conditions hydrogéologiques les plus favorables pour minimiser les impacts ont été évaluées en comparant plusieurs scénarios. Comme attendu, l’amplitude de l’impact sera la plus faible dans un milieu géologique de faible diffusivité hydraulique. Cependant, le paramètre qui joue le rôle le plus important est le volume d’eau stocké dans la mine. Sa variation modifie de manière considérable les impacts sur les écoulements d’eaux souterraines. Finalement, le problème est étudié de manière analytique et des solutions sont proposées pour évaluer les impacts, permettant un premier tri rapide des sites favorables pour implanter de futures installations UPSH. 在平坦地区可以利用露天矿坑或深矿井建造地下抽水蓄能电站,储存能源需求低的时期多余的电。充分考虑地下抽水蓄能电站和周围地质介质的相互作用必不可少。过去几乎没有对相关的地下水流影响做过评价。利用一个假定能够代表露天矿坑和深矿井的简化数值模型确定了对地下水流的影响。主要影响包括测压水头的振荡,其幅度取决于含水层/地质介质的特征、矿井和抽水注水的间隔。如果考虑平均测压水头,测压水头在地下抽水蓄能电站运行开始后初期下降,然后逐渐恢复。通过比较不同的几个方案,评价了使影响达到最小的最有利水文地质条件。水利扩散系数低的地质介质影响幅度较低。然而,发挥重要作用的参数是矿井储存水量。其变化可大大更改对地下水流的影响。最后,分析研究了出现的问题,提出了粗略估算影响的解决方法,可使人们对未来的地下抽水蓄能电站有利位置做出快速筛选. Underground pumped storage Hydroelectricity (UPSH) plants using open-pit or deep mines can be used in flat regions to store the excess of electricity produced during low-demand energy periods. It is essential to consider the interaction between UPSH plants and the surrounding geological media. There has been little work on the assessment of associated groundwater flow impacts. The impacts on groundwater flow are determined numerically using a simplified numerical model which is assumed to be representative of open-pit and deep mines. The main impact consists of oscillation of the piezometric head, and its magnitude depends on the characteristics of the aquifer/geological medium, the mine and the pumping and injection intervals. If an average piezometric head is considered, it drops at early times after the start of the UPSH plant activity and then recovers progressively. The most favorable hydrogeological conditions to minimize impacts are evaluated by comparing several scenarios. The impact magnitude will be lower in geological media with low hydraulic diffusivity; however, the parameter that plays the more important role is the volume of water stored in the mine. Its variation modifies considerably the groundwater flow impacts. Finally, the problem is studied analytically and some solutions are proposed to approximate the impacts, allowing a quick screening of favorable locations for future UPSH plants. Las centrales hidroeléctricas reversibles utilizando un embalse subterráneo (UPSH Underground Pumped Storage Hydroelectricity) formado por una mina a cielo abierto o subterránea permiten almacenar el exceso de electricidad producida durante períodos de baja demanda en regiones llanas. Es esencial tener en cuenta la interacción entre los sistemas UPSH y el medio geológico circundante. Existen pocos trabajos acerca de la evaluación de los impactos sobre el agua subterránea. Estos son determinados numéricamente utilizando un modelo simplificado que se supone representativo de minas subterráneas y a cielo abierto. El principal impacto consiste en la oscilación del nivel piezométrico, y su magnitud depende de las características del acuífero/medio geológico, la mina y los intervalos de bombeo e inyección. Si se considera un nivel piezométrico promedio, este decrece al inicio de la actividad del sistema UPSH y luego recupera progresivamente hasta su estado inicial. Las condiciones hidrogeológicas más favorables para minimizar los impactos son evaluadas comparando varios escenarios. La magnitud del impacto será menor en medios geológicos con baja difusividad hidráulica. Sin embargo, el volumen de agua almacenada en la mina es el parámetro que desempeña el papel más importante. Su variación modifica considerablemente los impactos sobre el flujo de agua subterránea. Por último, el problema se estudia analíticamente y se proponen algunas soluciones para evaluar los impactos. Estas soluciones permiten seleccionar rápidamente los sitios favorables para la construcción de futuras instalaciones UPSH. Usinas hidrelétricas reversíveis subterrâneas (UHRS) utilizando minas a céu aberto ou minas subterrâneas podem ser utilizadas em regiões planas para armazenamento do excedente da energia elétrica produzida durante períodos de baixa demanda energética. É essencial considerar a interação entre as UHRS e o meio geológico do entorno. Poucos estudos têm sido realizados na avaliação dos impactos associados ao fluxo das águas subterrâneas. Os impactos no fluxo das águas subterrâneas são determinados numericamente utilizando modelos numéricos simplificados, considerados representativos para minas a céu aberto e minas subterrâneas. Os principais impactos consistem na oscilação do nível piezométrico, e sua magnitude depende das características do aquífero/meio geológico, da mina e dos intervalos de bombeamento e injeção. Assumindo um nível piezométrico médio, há um declínio que sucede o início das atividades da UHRS, seguido de uma recuperação progressiva. As condições hidrogeológicas mais favoráveis para minimizar os impactos são avaliadas através da comparação de diversos cenários. A magnitude do impacto será inferior em meios geológicos de baixa difusividade hidráulica. Entretanto, o parâmetro que desempenha o papel mais importante é o volume da água armazenada na mina. Sua variação modifica consideravelmente os impactos no fluxo das águas subterrâneas. Por fim, o problema é estudado analiticamente e algumas soluções são propostas para aproximar os impactos, permitindo a rápida triagem de locais favoráveis para futuras UHRS.
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underground pumped storage Hydroelectricity using abandoned works deep mines or open pits and the impact on groundwater flow
Hydrogeology Journal, 2016Co-Authors: Estanislao Pujades, Sarah Bodeux, Philippe Orban, Thibault Willems, Alain DassarguesAbstract:Underground pumped storage Hydroelectricity (UPSH) plants using open-pit or deep mines can be used in flat regions to store the excess of electricity produced during low-demand energy periods. It is essential to consider the interaction between UPSH plants and the surrounding geological media. There has been little work on the assessment of associated groundwater flow impacts. The impacts on groundwater flow are determined numerically using a simplified numerical model which is assumed to be representative of open-pit and deep mines. The main impact consists of oscillation of the piezometric head, and its magnitude depends on the characteristics of the aquifer/geological medium, the mine and the pumping and injection intervals. If an average piezometric head is considered, it drops at early times after the start of the UPSH plant activity and then recovers progressively. The most favorable hydrogeological conditions to minimize impacts are evaluated by comparing several scenarios. The impact magnitude will be lower in geological media with low hydraulic diffusivity; however, the parameter that plays the more important role is the volume of water stored in the mine. Its variation modifies considerably the groundwater flow impacts. Finally, the problem is studied analytically and some solutions are proposed to approximate the impacts, allowing a quick screening of favorable locations for future UPSH plants.
