scholarly journals Investigating the Effect of Uncertainty Characteristics of Renewable Energy Resources on Power System Flexibility

2021 ◽  
Vol 11 (12) ◽  
pp. 5381
Author(s):  
Changgi Min
Keyword(s):  
Renewable Energy ◽  
Power System ◽  
Forecast Error ◽  
Energy Resources ◽  
Renewable Energy Resources ◽  
Load Forecast ◽  
Simulation Results ◽  
Net Load ◽  
Power System Flexibility ◽  
Skewness And Kurtosis

This study investigates the effect of uncertainty characteristics of renewable energy resources on the flexibility of a power system. The more renewable energy resources introduced, the greater the imbalance between load and generation. Securing the flexibility of the system is becoming important to manage this situation. The degree of flexibility cannot be independent of the uncertainty of the power system. However, most existing studies on flexibility have not explicitly considered the effects of uncertainty characteristics. Therefore, this study proposes a method to quantitatively analyze the effect of uncertainty characteristics on power system flexibility. Here, the uncertainties of the power system indicate the net load forecast error, which can be represented as a probability distribution. Of the characteristics of the net load forecast error, skewness and kurtosis were considered. The net load forecast error was modeled with a Pearson distribution, which has been widely used to generate the probability density function with skewness and kurtosis. Scenarios for the forecast net load, skewness, and kurtosis were generated, and their effects on flexibility were evaluated. The simulation results for the scenarios based on a modified IEEE-RTS-96 revealed that skewness is more effective than kurtosis. The proposed method can help system operators to efficiently respond to changes in the uncertainty characteristics of renewable energy resources.

scholarly journals Analyzing the Impact of Variability and Uncertainty on Power System Flexibility

2019 ◽  
Vol 9 (3) ◽  
pp. 561 ◽  
Author(s):  
Chang-Gi Min
Keyword(s):  
Sensitivity Analysis ◽  
Renewable Energy ◽  
Power System ◽  
Energy Resources ◽  
Renewable Energy Resources ◽  
Specific System ◽  
Efficient Operation ◽  
The Impact ◽  
Power System Flexibility ◽  
Flexibility Index

This study investigates the impact of variability and uncertainty on the flexibility of a power system. The variability and uncertainty make it harder to maintain the balance between load and generation. However, most existing studies on flexibility evaluation have not distinguished between the effects of variability and uncertainty. The countermeasures to address variability and uncertainty differ; thus, applying strategies individually tailored to variability and uncertainty is helpful for more efficient operation and planning of a power system. The first contribution of this study is in separating the variability and uncertainty, and determining which is more influential in terms of flexibility in specific system situations. A flexibility index, named the ramping capability shortage probability (RSP), is used to quantify the extent to which the variability and uncertainty affect the flexibility. The second contribution is to generate various scenarios for variability and uncertainty based on a modified IEEE-RTS-96, to evaluate the flexibility. The penetration level of renewable energy resources is kept the same in each scenario. The results of a sensitivity analysis show that variability is more effective than uncertainty for high and medium net loads.

scholarly journals Potential utilization of renewable energy resources for electricity generation in Bosnia and Herzegovina

2005 ◽  
Vol 9 (3) ◽  
pp. 15-23 ◽  
Author(s):  
Fajik Begic ◽  
Anes Kazagic
Keyword(s):  
Renewable Energy ◽  
Power System ◽  
Bosnia And Herzegovina ◽  
Electricity Market ◽  
Renewable Resources ◽  
Electricity Generation ◽  
Power Plants ◽  
Energy Resources ◽  
Energy Utilization ◽  
Renewable Energy Resources

Along with the current processes of restructuring of Energy power system of Bosnia and Herzegovina, liberalization of the electricity market, and modernization of the existing power plants, Bosnia and Herzegovina must turn to the utilization of renewable resources in reason able dynamics as well. Respecting this policy, the initial Valuation of the potential of renewable erg resources in Bosnia and Herzegovina is per formed. The methodology of evaluation of wind energy utilization is presented in this paper, as well as some other aspects of utilization of the renewable energy resources in Bosnia and Herzegovina. Implementation of selected projects should improve sustainability of energy power production in Bosnia and Herzegovina, by reducing the total emission of carbon dioxide originated from energy power system of Bosnia and Herzegovina.

scholarly journals Optimal Allocation of Hybrid Renewable Energy System by Multi-Objective Water Cycle Algorithm

2019 ◽  
Vol 11 (23) ◽  
pp. 6550 ◽  
Author(s):  
Mohamed ◽  
Ali ◽  
Alkhalaf ◽  
Senjyu ◽  
Hemeida
Keyword(s):  
Renewable Energy ◽  
Power System ◽  
Water Cycle ◽  
Energy Resources ◽  
Fuzzy Decision Making ◽  
Water Cycle Algorithm ◽  
Multi Objective ◽  
Load Models ◽  
Hybrid Renewable Energy System ◽  
Simulation Results

This article offers a multi-objective framework for an optimal mix of different types of distributed energy resources (DERs) under different load models. Many renewable and non-renewable energy resources like photovoltaic system (PV), micro-turbine (MT), fuel cell (FC), and wind turbine system (WT) are incorporated in a grid-connected hybrid power system to supply energy demand. The main aim of this article is to maximize environmental, technical, and economic benefits by minimizing various objective functions such as the annual cost, power loss and greenhouse gas emission subject to different power system constraints and uncertainty of renewable energy sources. For each load model, optimum DER size and its corresponding location are calculated. To test the feasibility and validation of the multi-objective water cycle algorithm (MOWCA) is conducted on the IEEE-33 bus and IEEE-69 bus network. The concept of Pareto-optimality is applied to generate trilateral surface of non-dominant Pareto-optimal set followed by a fuzzy decision-making mechanism to obtain the final compromise solution. Multi-objective non-dominated sorting genetic (NSGA-III) algorithm is also implemented and the simulation results between two algorithms are compared with each other. The achieved simulation results evidence the better performance of MOWCA comparing with the NSGA-III algorithm and at different load models, the determined DER locations and size are always righteous for enhancement of the distribution power system performance parameters.

scholarly journals Application of renewable energy resources in a microgrid power system

2019 ◽  
Vol 2019 (18) ◽  
pp. 5308-5313 ◽  
Author(s):  
Temitope Adefarati ◽  
Ramesh C. Bansal
Keyword(s):  
Renewable Energy ◽  
Power System ◽  
Energy Resources ◽  
Renewable Energy Resources

scholarly journals Constructing A Multi-Microgrid with the Inclusion of Renewable Energy in Oman's Rural Power System

2018 ◽  
Vol 13 (1) ◽  
pp. 61 ◽  
Author(s):  
Nasser Hosseinzadeh ◽  
A. Al Shereiqi ◽  
M. Albadi ◽  
Amer Al-Hinai
Keyword(s):  
Renewable Energy ◽  
Power System ◽  
Rural Area ◽  
Feasibility Study ◽  
Software Package ◽  
Power Flow ◽  
Power Plants ◽  
Energy Resources ◽  
Sultanate Of Oman ◽  
Renewable Energy Resources

 This paper investigates the possibility of constructing multi-microgrids by interlinking the rural area systems in the Al Wusta governorate of the Sultanate of Oman, which are currently being supplied by diesel generators. It is proposed to enhance the rural system under study by switching off small diesel stations and replacing them with wind turbines. The microgrids formed in this way are then interlinked together to create multi-microgrids. The paper studies the interlinked multi-microgrids under different scenarios; in terms of voltage profiles and power flow using the ETAP software package. This study contributes to the feasibility study of retiring some diesel power plants and using renewable energy resources in rural Oman.

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