The Experts below are selected from a list of 14118 Experts worldwide ranked by ideXlab platform
Pablo Solana - One of the best experts on this subject based on the ideXlab platform.
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Optimization of a hybrid diesel-wind generation plant with Operational Options
Renewable Energy, 2013Co-Authors: Pablo SolanaAbstract:Hybrid diesel-wind power generation systems have a great potential in the application of providing energy supply for remote communities and facilities. Compared to the traditional diesel system, hybrid power plants can offer many advantages such as additional capacity, being more environmentally friendly, potential reduction of cost, etc. One of the problems for the hybrid system is the uncertain profit due to the uncertain nature of the wind. In this paper a general model is presented based on real Option theory for valuating a hybrid diesel-wind generation plant. A dynamic programming method is used to generate the optimum Operational Option by maximizing the net cash flow of the plant. Results show that Operational Options can provide additional value to the hybrid power system when this Operational flexibility is correctly utilized. The optimal scale of wind turbines generators (WTGs) can be calculated as a consequence of the limitation of demand and local wind power density. This paper also provides a framework to find the optimal operating decision at each time step based on the real Option model.
D. M. Winn - One of the best experts on this subject based on the ideXlab platform.
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Marine Corps Reserves: An Operational Option for a Shrinking Armed Force
1992Co-Authors: D. M. WinnAbstract:Abstract : The Marine Corps Reserve can support active duty units, and will become increasingly critical to sustainability as the force structure declines. Reserve support is not currently a first choice for augmentation by Operational commanders. However, as less active units are available, commanders will be forced to tap reserve personnel, especially in the service support communities. The Marine Corps Reserve possesses dynamic capability that should not be overlooked as a last resort measure. The strengths of the reserve include: trained, functional, combat power or sustainment support. Their acquired training, funding, planning and augmentation assets will become crucial for the Operational tempo, as active forces shrink. The key limitation to the reserve is the legislated periods they can serve on active duty. This is a serious weakness, which must be neutralized by effective planning or coordination. Reserve units can be used as a base force for theater training operations, annual training augmentation, or mustered as initial volunteers to support the commander. Reserves can assist in bridging the gaps created by downsizing the active force Planning or this support must be integrated now.
Konstantinos Aravossis - One of the best experts on this subject based on the ideXlab platform.
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Flexible fuel rotation for the retrofitting of lignite power plants
Fresenius Environmental Bulletin, 2013Co-Authors: Grigoris Varympopiotis, Athanasios Tolis, Athanasios Rentizelas, Ilias P. Tatsiopoulos, Konstantinos AravossisAbstract:A fuel based optimality approach is to be presented, adapted for large retrofitting projects in the electricity market. The case study focuses on existing lignite power plants that may switch their fuel to natural gas and from that point on they may either switch back to lignite or retain natural gas or routinely switch between these two alternative operating fuels. The goal of the operating fuel rotation is to maximize profits, depending on the economical and environmental characteristics of each discrete time period under study. The business risks may also be reduced by exploiting the most profitable Operational Option in response to markets’ instabilities. The data for this research have been retrieved from the Greek Power Sector. Probabilistic models are utilized for the simulation of future prices, in conjunction with a real Options model used for the analysis of the alternative strategies. The study has shown that the potential benefits from the implementation of fuel rotation are reflected in the anticipated financial yields, which may be significantly higher than in single fuel operation. Moreover, the Operational stability and flexibility as well as the security of fuel supply are also ensured in the target power plant.
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Strategic investments for existing power plants
2011Co-Authors: Grigoris Varympopiotis, Athanasios Tolis, Athanasios Rentizelas, Ilias P. Tatsiopoulos, Konstantinos AravossisAbstract:A model to investigate a fuel based optimality approach for strategic investments in the power sector is presented. The innovative concept of switching between the available operating fuel sources of the power plant over its lifetime is examined. More specifically, the case study examined, concerns an existing lignite power plant that may switch its fuel to natural gas, and from that point on it may either switch back to lignite or retain natural gas or routinely switch between the alternative fuels. This research concentrates on the electricity market of Greece, for the period of 2010-2030. Probabilistic models to forecast future prices are used in conjunction with a real Options model to cope with alternative strategies. Depending on the economical and environmental standings of each period, the power plant can alter its input fuel to maximize profits or reduce emissions. Therefore, more Options for the operating fuel emerge, thus reducing business risks and exploiting the most profitable Operational Option in response to markets instabilities (i.e. fuel price differences over time, emissions cost fluctuation, etc.). Strategic flexibility, security of supply, stability, and increased profits are the potential advantages of the presented model dealing with energy investments.
Lajos Hanzo - One of the best experts on this subject based on the ideXlab platform.
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Simultaneous target detection and multi-user communications enabled by joint beamforming
2018 IEEE Radar Conference (RadarConf18), 2018Co-Authors: Fan Liu, Christos Masouros, Jianming Zhou, Lajos HanzoAbstract:In this paper, we propose several joint beamforming designs for the multi-input-multi-output (MIMO) dual-functional radar-communication system. We firstly split the antennas into two groups, one for radar and the other for communication. With this separated deployment, the radar signal is designed to fall into the null-space of the downlink communication channel. The communication beamformer is optimized such that the obtained beampattern matches the radar's beampattern while satisfying the performance requirements of the downlink users. We further consider a second Operational Option, where all the antennas transmit a joint waveform that is shared by both radar and communications, and formulate an appropriate beampattern while guaranteeing the downlink cellular transmission. Numerical results show that both methods are able to realize the simultaneous radar detection and wireless information transfer.
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MU-MIMO Communications with MIMO Radar: From Co-existence to Joint Transmission
arXiv: Information Theory, 2017Co-Authors: Fan Liu, Christos Masouros, Huafei Sun, Lajos HanzoAbstract:Beamforming techniques are proposed for a joint multi-input-multi-output (MIMO) radar-communication (RadCom) system, where a single device acts both as a radar and a communication base station (BS) by simultaneously communicating with downlink users and detecting radar targets. Two Operational Options are considered, where we first split the antennas into two groups, one for radar and the other for communication. Under this deployment, the radar signal is designed to fall into the null-space of the downlink channel. The communication beamformer is optimized such that the beampattern obtained matches the radar's beampattern while satisfying the communication performance requirements. To reduce the optimizations' constraints, we consider a second Operational Option, where all the antennas transmit a joint waveform that is shared by both radar and communications. In this case, we formulate an appropriate probing beampattern, while guaranteeing the performance of the downlink communications. By incorporating the SINR constraints into objective functions as penalty terms, we further simplify the original beamforming designs to weighted optimizations, and solve them by efficient manifold algorithms. Numerical results show that the shared deployment outperforms the separated case significantly, and the proposed weighted optimizations achieve a similar performance to the original optimizations, despite their significantly lower computational complexity.
Grigoris Varympopiotis - One of the best experts on this subject based on the ideXlab platform.
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Flexible fuel rotation for the retrofitting of lignite power plants
Fresenius Environmental Bulletin, 2013Co-Authors: Grigoris Varympopiotis, Athanasios Tolis, Athanasios Rentizelas, Ilias P. Tatsiopoulos, Konstantinos AravossisAbstract:A fuel based optimality approach is to be presented, adapted for large retrofitting projects in the electricity market. The case study focuses on existing lignite power plants that may switch their fuel to natural gas and from that point on they may either switch back to lignite or retain natural gas or routinely switch between these two alternative operating fuels. The goal of the operating fuel rotation is to maximize profits, depending on the economical and environmental characteristics of each discrete time period under study. The business risks may also be reduced by exploiting the most profitable Operational Option in response to markets’ instabilities. The data for this research have been retrieved from the Greek Power Sector. Probabilistic models are utilized for the simulation of future prices, in conjunction with a real Options model used for the analysis of the alternative strategies. The study has shown that the potential benefits from the implementation of fuel rotation are reflected in the anticipated financial yields, which may be significantly higher than in single fuel operation. Moreover, the Operational stability and flexibility as well as the security of fuel supply are also ensured in the target power plant.
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Strategic investments for existing power plants
2011Co-Authors: Grigoris Varympopiotis, Athanasios Tolis, Athanasios Rentizelas, Ilias P. Tatsiopoulos, Konstantinos AravossisAbstract:A model to investigate a fuel based optimality approach for strategic investments in the power sector is presented. The innovative concept of switching between the available operating fuel sources of the power plant over its lifetime is examined. More specifically, the case study examined, concerns an existing lignite power plant that may switch its fuel to natural gas, and from that point on it may either switch back to lignite or retain natural gas or routinely switch between the alternative fuels. This research concentrates on the electricity market of Greece, for the period of 2010-2030. Probabilistic models to forecast future prices are used in conjunction with a real Options model to cope with alternative strategies. Depending on the economical and environmental standings of each period, the power plant can alter its input fuel to maximize profits or reduce emissions. Therefore, more Options for the operating fuel emerge, thus reducing business risks and exploiting the most profitable Operational Option in response to markets instabilities (i.e. fuel price differences over time, emissions cost fluctuation, etc.). Strategic flexibility, security of supply, stability, and increased profits are the potential advantages of the presented model dealing with energy investments.