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The impact of coordinated malicious attacks may be dramatically severe and may yield a wide area blackout. A preventive measure is enhancing the infrastructure through investment. Due to limited budget, a decision making is required to select the best possible options, considering cost/benefit ratio. We designed a time-step simulation framework representing the evolution of post-contingency failures...
We analyze an optimal power flow problem in the case of a scenario where the generators, even assuming continuous operation, do have non-monotone marginal production cost profile. We decompose the operating range of generators into intervals corresponding to operation modes. We show that if in each such interval the production characteristics is approximated by a linear function, a two level optimization...
The use of renewable energy sources, such as wind power, is of major importance in future power grids for economic and environmental reasons, while the intermittent and stochastic nature of such energy brings challenges to system dispatch. Application of the virtual power plant (VPP) concept is one of the promising ways to improve utilization of renewable power. Among the many issues of practically...
This paper presents the Scottish Electricity Dispatch Model (SEDM), a cost minimization power system optimization model designed as a tool to investigate potential development trajectories of the Great Britain (GB) power system with particular focus on the Scottish region. Results of SEDM studies investigating the impact of low carbon policies on carbon emissions, generation portfolios and system...
Wind energy is a prominent area of application of variable-speed generators operating on the constant grid frequency. This paper describes the operation and control of one of these variable-speed wind generators: the direct driven permanent magnet synchronous generator (PMSG). This generator is connected to the power network by means of a fully controlled frequency converter, which consists of a pulse-width-modulation...
If grid integration concerns have come to the fore in recent years as an issue that may impede the widespread deployment of wind generators into power systems, available scheduling algorithms to allow their seamless penetration to grid has lagged its explosive growth. This paper proposes a model to optimally commit generating units while simultaneously determining the geographical allocation of the...
In the process of wind power generation, the power curve of wind power generating unit reflects the operating state and the actual generating capacity of the wind turbine. And it is also an important indicator of the performance of the wind turbine. In this paper, a new method — method of grid is proposed based on IEC61400-12-1 standard. In this method, the wind speed — power coordinate system is...
The paper is focused on analysis and comparison of breaking capability of conventional distributional circuit breakers and generator circuit breakers within special cases of breaking. The loss of breaking capability in limitary areas of breaking characteristics might lead to the circuit breaker's failure during clearances of asymmetrical currents with large DC component. The first part of the paper...
Solar power generation, unlike conventional forms of electricity generation, has higher variability and uncertainty in its output, because solar plant output is strongly impacted by weather. As the penetration rate of solar capacity increases, grid operators are increasingly concerned about accommodating the increased variability and uncertainty that solar power provides. This paper illustrates the...
Due to global climate change, many energy sectors are witnessing various efforts to make their systems more efficient and less pollutant. Demand response has been considered one of such efforts in power system operations. Industrial consumers of electricity, including manufacturing plants, have been attractive targets for demand response due to their large energy consumption scales. The idea of integrating...
Forecast uncertainty related to the power production from renewables frequently leads to significant changes between the scheduled and the actual power injections. Larger and more frequent fluctuations in the power production require new approaches to handle congestion and ensure system security. In this paper, we investigate how different strategies for reserve activation influence the cost of integrating...
Due to an increasing amount of wind turbines in the power system, which have a volatile power output, the need for flexibility increases. This flexibility can be obtained by ancillary services. Therefore, the provision of ancillary services with wind turbines is gaining interest. As they currently do not participate in the frequency control, this might compromise the proper functioning of the power...
Pico-hydro power generation has a considerable untapped potential, able to contribute to the increased energy demand whilst ensuring a low environmental impact. The integration of these systems into microgrids is an emerging solution for the electrification of remote regions and also for self-sustainable power systems. The integration of cheap and wide spread technologies to interface small capacity...
The large scale integration of renewable energy sources (RES) challenges power system planners and operators alike as it can potentially introduce the need for costly investments in infrastructure. Furthermore, traditional market clearing mechanisms are no longer optimal due to the stochastic nature of RES. This paper presents a risk-aware market clearing strategy for a network with significant shares...
Classic unit commitment (UC) is an important and challenging task of allocating generating units subject to basic constraints over a scheduled time horizon to obtain the least generation cost. Penetration of wind power generator in a modern power system makes generation planning more complex. This study presents the effect of uncertain wind power on joint energy and spinning reserve scheduling. An...
The goal of NASA's Radioisotope Power Systems (RPS) Program is to make RPS ready and available to support the exploration of the solar system in environments where the use of conventional solar or chemical power generation is impractical or insufficient to meet the needs of the missions. To meet this goal, the RPS Program, working closely with the Department of Energy, performs mission and system...
Since the great east Japan earthquake, photovoltaic (PV) and wind generator (WG) are introduced actively as a solution regarding shortage of electrical power with the stopping of nuclear power plants. Renewable energy source such as PV generator and WG contribute for prevention of global warming because these energy dose not use fossil fuels and it can reduce carbon dioxide emissions. However, it...
NASA has a consistent need for radioisotope power systems (RPS) to enable robotic scientific missions for planetary exploration that has been present for over four decades and will continue into the foreseeable future, as documented in the most recent Planetary Science Decadal Study Report. As RPS have evolved throughout the years, there has also grown a desire for more efficient power systems, allowing...
Due to large-scale renewable energy installation, frequency regulation is becoming more important and more difficult in power system. Battery energy storage system (BESS) is the one solution to this problem. It is assumed that effectiveness of installing BESS into power systems depends on its generation mix and control systems of frequency regulation. However, the optimal size of BESS has been discussed...
Phenomenal increase in load and cost of electricity has raised many challenges ranging from security of the system to the economics of generation. For economic operation of power system, the solution to Unit Commitment problem is necessary. Unit Commitment aims to schedule the power generation to meet the load demands at the most economical rate for the next few hours. It decides that which unit should...
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