More than 1 billion people worldwide living in rural communities without access to electricity could benefit from distributed generation. A major difficulty with any distributed generation solution, however, is coordi...
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More than 1 billion people worldwide living in rural communities without access to electricity could benefit from distributed generation. A major difficulty with any distributed generation solution, however, is coordinating the distributed energy resources to meet demands. Distributed control techniques based on resource allocation can be used to solve this problem. One such technique utilizes bilateral contracts between loads and sources, which can be facilitated by auctions. Four major auction types - first-price sealed bid, Vickrey, English and Dutch - can be used. Simulations that mimic distributed control have been conducted in order to compare the four auction types. The simulations show which auction types should be used under different conditions.
An increase of dispersed energy resources (DER) in the power system is expected within the next decade. Computations are necessary to find out the best proportion of dispersed generation to conventional power generati...
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An increase of dispersed energy resources (DER) in the power system is expected within the next decade. Computations are necessary to find out the best proportion of dispersed generation to conventional power generation. This paper presents results of long-term-interval network simulations considering suitable models of DER. Problems of voltage control and stability level, overloading of devices and change of load flow direction are investigated, applying data of a test network. First, the philosophy of the modeling and the results of operation simulations in the test power system network are illustrated, and then network simulation results are discussed. Some critical cases are pinpointed and described.
This paper presents dynamic analysis of an isolated distribution network. This study has been carried out in a project looking at the consequences of a high penetration of distributed energy resources (DER) and distri...
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This paper presents dynamic analysis of an isolated distribution network. This study has been carried out in a project looking at the consequences of a high penetration of distributed energy resources (DER) and distributed generation (DG). A network of a village (200 customers) in isolated mode is used for the study with DER connected to network via inverters such as microturbines, fuel cells and storage device. Several scenarios were used to dynamic simulations such as load and generation variation, starting of LV motor and short circuit. Influences of various coordinated controls and operating modes on dynamic behaviours are investigated. The results of this study can be used to specify the service systems in the future.
Distributed energy resources (DER) include distributed generation, storage, and responsive demand. The integration of DER into the power system control framework is part of the evolutionary advances that allow these r...
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Distributed energy resources (DER) include distributed generation, storage, and responsive demand. The integration of DER into the power system control framework is part of the evolutionary advances that allow these resources to actively participate in the energy balance equation. Price can provide a powerful signal for independent decision-making in distributed control strategies. To study the impact of price responsive DER on the electric power system requires generation and load models that can capture the dynamic coupling between the energy market and the physical operation of the power system in appropriate time frames. This paper presents modeling approaches for simulating electricity market price responsive DER, and introduces a statistical mechanics approach to modeling the aggregated response of a transformed electric system of pervasive, transacting DER.
A major problem with any solution for distributed generation (DG) is the coordination of distributed energy resources (DER) to meet demand. Taking a new approach to the problem, we consider off-grid implementations th...
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A major problem with any solution for distributed generation (DG) is the coordination of distributed energy resources (DER) to meet demand. Taking a new approach to the problem, we consider off-grid implementations that would have the greatest impact in remote and developing regions. Our proposed system creates a micro-grid by linking together a group of individual communities for backup and peak-shaving. As such, the DER must be coordinated (and scheduled) to meet the total demand of the micro-grid. Two distributed coordination strategies are currently being examined - bilateral contracts and market-based techniques. Employing fuzzy costs allows the system to be optimized for a range of values. Finally, we describe research in progress to develop a holonic system model of a distributed testbed and implement it using the JADE development platform to evaluate coordination strategies under different micro-grid configurations.
The limits of the traditional experiment approach to extract resistivity in junction-isolated samples are discussed basing both on physical simulations and on extensive experimental data. Several optimization criteria...
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The limits of the traditional experiment approach to extract resistivity in junction-isolated samples are discussed basing both on physical simulations and on extensive experimental data. Several optimization criteria to design van der Pauw resistors and a related characterization procedure are proposed and experimentally validated in order to extend the extraction of the resistivity up to 500/spl deg/C.
The corrected equation of the van der Waals pressure for a multilayered system which was developed by the authors was applied to an inclined flying head slider. The effect of the van der Waals forces on the static and...
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The corrected equation of the van der Waals pressure for a multilayered system which was developed by the authors was applied to an inclined flying head slider. The effect of the van der Waals forces on the static and dynamic characteristics of the head slider was clarified.
In this paper, a hierarchical modulation scheme (known also as embedded, multi-resolution, or asymmetrical constellation) is studied for transmission of multicast and multimedia services over wireless fading channels....
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In this paper, a hierarchical modulation scheme (known also as embedded, multi-resolution, or asymmetrical constellation) is studied for transmission of multicast and multimedia services over wireless fading channels. Specifically, we propose general design guidelines for multicast and multimedia transmission over fading channels with an adaptive hierarchical phase-shift-keying (PSK) constellation. Computer simulation results show that the proposed adaptive hierarchical M-PSK is more energy efficient than the traditional adaptive uniform M-PSK for both applications except some special cases. The energy gain of hierarchical PSK over uniform PSK depends only on the required quality parameters of the services in multimedia transmission. For multicasting, the gain depends on both the recipients' link qualities and the required quality parameters of the multicast message.
This paper uses dissipativity theory to provide the system-theoretic description of a basic oscillation mechanism. Elementary input-output tools are then used to prove the existence and stability of limit cycles in th...
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This paper uses dissipativity theory to provide the system-theoretic description of a basic oscillation mechanism. Elementary input-output tools are then used to prove the existence and stability of limit cycles in these "oscillators". The main benefit of the proposed approach is that it is well suited for the analysis and design of interconnections, thus providing a valuable mathematical tool for the study of networks of coupled oscillators.
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