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Sustainable Energy, IEEE Transactions on

Issue 2 • Date April 2011

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Displaying Results 1 - 16 of 16
  • Table of contents

    Page(s): C1
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  • IEEE Transactions on Sustainable Energy

    Page(s): C2
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  • Application of SMES Unit in Improving the Performance of an AC/DC Power System

    Page(s): 109 - 121
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2485 KB) |  | HTML iconHTML  

    This paper investigates the use of a superconducting magnetic energy storage (SMES) unit to improve the performance of an ac/dc power system. In this context, investigations have been conducted on a large turbine-generator unit connected to a high-voltage direct current (HVDC) system. The impact of HVDC converter station faults on the torsional torques induced in turbine-generator shafts with and without using an SMES unit is elaborated. Faults considered are fire-through, misfire, short circuit across the inverter station, flashover, and a three-phase short circuit in the ac system. These investigations are studied using an electromagnetic transient program power system simulation/electromagnetic transients including DC (PSCAD/EMTDC) and the results are presented in the form of typical time responses as well as harmonic analysis. View full abstract»

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  • Analytical Determination of the Control Parameters for a Large Photovoltaic Generator Embedded in a Grid System

    Page(s): 122 - 130
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1466 KB) |  | HTML iconHTML  

    It appears that, until now, no work has been reported on evaluating the operational impacts of large photovoltaic generators (PVGs) embedded in a high-voltage grid system. To meet this goal, the authors have proposed in this paper that the pulsewidth-modulated inverter that interfaces a PVG with a grid Bus be modelled in terms of its control parameters in the load flow analysis. This will then provide a direct answer as how to control a PVG and what will be the real and reactive power, and voltage at the interfacing and other grid Buses. For this it is necessary to predetermine the PVG inverter control parameters for a given steady state, i.e., given insolation (incoming solar radiation) and system load. So an analytical method for this predetermination has been proposed considering the available insolation and the boundary conditions of the interfacing grid Bus. Also the way the impact evaluation using the control parameters incorporated load flow analysis is made has been shown for two test systems having different characteristics. The proposed method being very fast can be applied for setting in real-time the control parameters for inverters of large PVGs embedded in a conventional power system. View full abstract»

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  • Influence of Environmental Constraints on Profit-Based Short-Term Thermal Scheduling

    Page(s): 131 - 138
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1058 KB) |  | HTML iconHTML  

    This paper is on the short-term thermal scheduling (STTS) problem, particularly concerning the new competitive and environmentally constrained electricity supply industry. On the one hand, within the electricity market, STTS has evolved from a minimum-cost policy in state-owned monopolistic companies to a profit-based policy under market conditions. On the other hand, as a consequence of growing environmental concerns, an unprecedented change points to a scenario where it is necessary to take into account the constraints related to the environment. We propose a multiobjective optimization (MO) approach to solve the profit-based STTS problem with environmental concerns. Two case studies are considered: the IEEE 30-bus system and a 75-bus system. Finally, conclusions are duly drawn. View full abstract»

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  • Coordinated Active Power Curtailment of Grid Connected PV Inverters for Overvoltage Prevention

    Page(s): 139 - 147
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1538 KB) |  | HTML iconHTML  

    Overvoltages in low voltage (LV) feeders with high penetration of photovoltaics (PV) are usually prevented by limiting the feeder's PV capacity to very conservative values, even if the critical periods rarely occur. This paper discusses the use of droop-based active power curtailment techniques for overvoltage prevention in radial LV feeders as a means for increasing the installed PV capacity and energy yield. Two schemes are proposed and tested in a typical 240-V/75-kVA Canadian suburban distribution feeder with 12 houses with roof-top PV systems. In the first scheme, all PV inverters have the same droop coefficients. In the second, the droop coefficients are different so as to share the total active power curtailed among all PV inverters/houses. Simulation results demonstrate the effectiveness of the proposed schemes and that the option of sharing the power curtailment among all customers comes at the cost of an overall higher amount of power curtailed. View full abstract»

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  • On the Determination of Battery Energy Storage Capacity and Short-Term Power Dispatch of a Wind Farm

    Page(s): 148 - 158
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1370 KB) |  | HTML iconHTML  

    A methodology on the design of a wind farm battery energy storage system to realize power dispatchability is described. Based on the statistical long-term wind speed data captured at the farm, a dispatch strategy is proposed which allows the battery capacity to be determined so as to maximize a defined service lifetime/unit cost index of the energy storage system. Also, the application of the dispatch strategy is shown to yield the short-term wind farm output power schedule which meets the specified confidence level of power delivery commitment. View full abstract»

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  • Analysis of a Microturbine Generator System Connected to a Distribution System Through Power-Electronics Converters

    Page(s): 159 - 166
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (785 KB) |  | HTML iconHTML  

    This paper presents the analyzed results of a permanent-magnet synchronous generator-based microturbine generator (MTG) system connected to a distribution system through an AC-to-DC converter and a DC-to-AC inverter. The employed mathematical model based on a dq-axis reference frame is derived to establish the complete dynamic equations of the studied MTG system for simulating the characteristics of the MTG under various operating conditions. A damping controller is designed for the DC-to-AC inverter using modal control theory to render adequate damping characteristics to the studied MTG under various disturbance conditions. Steady-state performance and dynamic simulations of the studied MTG under different operating conditions and various disturbance conditions are carried out, respectively. It can be concluded from the simulation results that the designed damping controller of the DC-to-AC inverter can provide adequate and effective damping characteristics to the studied grid-connected MTG system under disturbance conditions. View full abstract»

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  • A Study of Optimal Nonfirm Wind Capacity Connection to Congested Transmission Systems

    Page(s): 167 - 176
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1049 KB) |  | HTML iconHTML  

    As wind is a low capacity factor source of power generation, a nonphysically firm connection strategy is key to its cost-effective and timely integration to presently constrained transmission networks. This paper, therefore, outlines the design and study of an optimal nonfirm wind capacity allocation model. While a precise statistical representation of wind power variations and geographical interdependency requires a significant number of data samples, the structured very-large-scale linear programming problem that results is shown to be exploitable by the Benders' decomposition scheme. Various wind capacity target levels are considered, and important sensitivity analyses are performed for multiple load profiles, wind profiles, and fuel price parameter values. Interestingly, the optimal wind capacity allocation is found to be reasonably robust to sizeable load and fuel price deviations, and while the effect of a limited historical wind data profile is more influential, the associated cost-function penalty is not significantly critical. The economic value of combining wind connection with advanced postcontingency network remedial action schemes is also highlighted. View full abstract»

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  • Correlations Between Large-Scale Solar and Wind Power in a Future Scenario for Sweden

    Page(s): 177 - 184
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    Future power systems are likely to include large amounts of variable power generation such as solar and wind power. As a variable output has to be balanced by the power system's reserves, it is important to study the time variability, coincidence, and correlations between power sources. The effect of output smoothing from dispersion of wind power plants is well established, but there is a need to study more renewables in combination. This study analyses large-scale solar and wind power in a future scenario for Sweden, using climatic data covering eight years with an hourly resolution. It is shown that solar and wind power are negatively correlated on all time scales, from hourly to annual, but that the correlation is strongest for monthly totals. Combining solar and wind power reduces total variations in terms of standard deviation, but hour-to-hour variability is always higher with a larger share of solar power. View full abstract»

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  • Factors Influencing Wind Energy Curtailment

    Page(s): 185 - 193
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    Nonphysically firm wind generation connections (i.e., those to which curtailment can apply) may be necessary for significant wind integration to congested transmission networks. A study of factors influencing this associated wind energy curtailment is, therefore, of timely importance. In this paper, the wind curtailment estimation effects of natural inter-yearly wind profile variability, system demand-profile/fuel-price parameter uncertainty, and minimum system inertial constraints are studied in detail. Results indicate that curtailment estimation error can be reduced by appropriate wind data year-length and sampling-rate choice, though a pragmatic consideration of system parameter uncertainty should be maintained. Congestion-related wind energy curtailment risk due to such parameter uncertainty exhibits appreciable interlocational dependency, suggesting there may be scope for effective curtailment risk management. The coincidence of wind energy curtailment estimated due to network thermal congestion and system-wide inertial-stability issues also has commercial significance for systems with very high wind energy penetration targets, suggesting there may be appreciable interaction between different sources of curtailment in reality. View full abstract»

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  • Valuing Investments in Multi-Energy Conversion, Storage, and Demand-Side Management Systems Under Uncertainty

    Page(s): 194 - 202
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1358 KB) |  | HTML iconHTML  

    In this paper, a financial valuation method for energy hubs with conversion, storage, and demand-side management (DSM) capabilities is proposed. An energy hub is an integrated system of units, e.g., a combined heat and power plant and a heat storage, which allows the conversion and storage of multiple energy carriers. In this paper, an extended energy hub model is presented which additionally takes into account the possibility of performing DSM with the load(s) connected to the hub output. Taking into account the energy hub's flexibility to change its output power(s), its economic value is determined with a method based on Monte Carlo simulation. This method calculates an optimal dispatch of the hub for a large amount of possible price paths of the input and output energy carriers. By means of the proposed energy hub Monte Carlo valuation model, integrated systems of multi-energy conversion and storage devices can be valued together with load management schemes. In doing so, the energy hub's ability to flexibly adapt its output to uncertain and volatile market prices is explicitly considered. View full abstract»

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    Page(s): 203
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    Page(s): 204
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  • IEEE Transactions on Sustainable Energy society information

    Page(s): C3
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  • IEEE Power Engineering Society information for authors

    Page(s): C4
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Aims & Scope

The IEEE Transactions on Sustainable Energy is a cross disciplinary and internationally archival journal aimed at disseminating results of research on sustainable energy that relates to, arises from, or deliberately influences energy generation, transmission, distribution and delivery.

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Meet Our Editors

Editor-in-Chief
Dr. Bikash C. Pal,  Ph.D.
Imperial College