In this paper the provision of flexible generation is investigated by extracting steam from Rankine-cycle power stations during off-peak demand in order to charge thermal tanks that contain suitable phase-change mater...In this paper the provision of flexible generation is investigated by extracting steam from Rankine-cycle power stations during off-peak demand in order to charge thermal tanks that contain suitable phase-change materials(PCMs);at a later time when this is required and/or is economically effective,these thermal energy storage(TES)tanks can act as the heat sources of secondary thermal power plants in order to generate power,for example as evaporators of,e.g.,organic Rankine cycle(ORC)plants that are suitable for power generation at reduced temperatures and smaller scales.This type of solution offers greater flexibility than TES-only technologies that store thermal energy and release it back to the base power station,since it allows both derating but also over-generation compared to the base power-station capacity.The solution is applied in a case study of a 50-MW rated oil-fired power station unit at the autonomous system of Crete.The optimal operation of the TES system is investigated,by solving a modified Unit Commitment-Economic Dispatch optimization problem,which includes the TES operating constraints.The results indicate that for most of the scenarios the discounted payback period is lower than 12 years,while in few cases the payback period is 5 years.展开更多
Decentralized distributed clean-energy sources have become an essential need for smart grids to reduce the harmful effects of conventional power plants.Smart homes with a suitable sizing process and proper energy-mana...Decentralized distributed clean-energy sources have become an essential need for smart grids to reduce the harmful effects of conventional power plants.Smart homes with a suitable sizing process and proper energy-management schemes can share in reducing the whole grid demand and even sell clean energy to the utility.Smart homes have been introduced recently as an alternative solution to classical power-system problems,such as the emissions of thermal plants and blackout hazards due to bulk plants/transmission outages.The appliances,sources and energy storage of smart homes should be coordinated with the requirements of homeowners via a suitable energy-management scheme.Energy-management systems are the main key to optimizing both home sources and the operation of loads to maximize home-economic benefits while keeping a comfortable lifestyle.The intermittent uncertain nature of smart homes may badly affect the whole grid performance.The prospective high penetration of smart homes on a smart power grid will introduce new,unusual scenarios in both generation and loading.In this paper,the main features and requirements of smart homes are defined.This review aims also to address recent proposed smart-home energy-management schemes.Moreover,smart-grid challenges with a high penetration of smart-home power are discussed.展开更多
文摘In this paper the provision of flexible generation is investigated by extracting steam from Rankine-cycle power stations during off-peak demand in order to charge thermal tanks that contain suitable phase-change materials(PCMs);at a later time when this is required and/or is economically effective,these thermal energy storage(TES)tanks can act as the heat sources of secondary thermal power plants in order to generate power,for example as evaporators of,e.g.,organic Rankine cycle(ORC)plants that are suitable for power generation at reduced temperatures and smaller scales.This type of solution offers greater flexibility than TES-only technologies that store thermal energy and release it back to the base power station,since it allows both derating but also over-generation compared to the base power-station capacity.The solution is applied in a case study of a 50-MW rated oil-fired power station unit at the autonomous system of Crete.The optimal operation of the TES system is investigated,by solving a modified Unit Commitment-Economic Dispatch optimization problem,which includes the TES operating constraints.The results indicate that for most of the scenarios the discounted payback period is lower than 12 years,while in few cases the payback period is 5 years.
基金supported by the project entitled‘Smart Homes Energy Management Strategies’,Project ID:4915,JESOR-2015-Cycle 4,which is sponsored by the Egyptian Academy of Scientific Research and Technology(ASRT),Cairo,Egypt.
文摘Decentralized distributed clean-energy sources have become an essential need for smart grids to reduce the harmful effects of conventional power plants.Smart homes with a suitable sizing process and proper energy-management schemes can share in reducing the whole grid demand and even sell clean energy to the utility.Smart homes have been introduced recently as an alternative solution to classical power-system problems,such as the emissions of thermal plants and blackout hazards due to bulk plants/transmission outages.The appliances,sources and energy storage of smart homes should be coordinated with the requirements of homeowners via a suitable energy-management scheme.Energy-management systems are the main key to optimizing both home sources and the operation of loads to maximize home-economic benefits while keeping a comfortable lifestyle.The intermittent uncertain nature of smart homes may badly affect the whole grid performance.The prospective high penetration of smart homes on a smart power grid will introduce new,unusual scenarios in both generation and loading.In this paper,the main features and requirements of smart homes are defined.This review aims also to address recent proposed smart-home energy-management schemes.Moreover,smart-grid challenges with a high penetration of smart-home power are discussed.
