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Minimizing the levelized cost of energy in an offshore wind farm with non-homogeneous turbines through layout optimization
, Article Ocean Engineering ; Volume 249 , 2022 ; 00298018 (ISSN) ; Khorasanchi, M ; Sayyaadi, H ; Sadollah, A ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
Minimum cost of energy is the main goal of a wind farm layout optimization. This is achieved by maximizing the total energy while minimizing the total costs of the farm. In this study, two sizes of commercial turbines were considered to investigate the effect of a non-homogenous farm on the layout optimization process. A cost model consisting of turbines, cable, transformers, foundation, and service vehicle routes was developed. Using Genetic Algorithm and Artificial Neural Network, first the superiority of the new algorithm in turbines and cable layout was verified versus previous studies. Next, two cases were investigated, i.e. (1) a farm populated with identical turbines and (2) a farm...
Performance evaluation of energy meters in nonses'usoidal environment based on IEEE 1459 standard
, Article 22nd International Conference and Exhibition on Electricity Distribution, CIRED 2013; Stockholm; Sweden; 10 June 2013 through 13 June 2013 ; Volume: 2013, Issue: 615 , 2013 ; 9781849197328 (ISBN) ; Honarmand, M. E ; Ouni, S ; Mehri, R ; Behinh, Y ; Mokhtari, H ; Talebi, J ; Sharif University of Technology
2013
Abstract
The objective of this work is to study the effects of harmonics on energy meters. This study is canied out based on IEEE 1459 standard through extensive tests on some energy meters installed at Gil an utility consumers. First, a review on IEEE 1459 standard on power definitions will be given. The definitions are then ervaluated for a compact Fluorescent Lamp (CFL) as a harmonic generating load. Then, the results of the performance e-alnation of two energy meters are presented for different linear and nonlinear loads based on IEEE1459 standard power definitions. Two different test procedures are performed for this putpose. In the first series of tests, a harmonic polluted voltage is applied...
Optimal supplementary frequency controller design using the wind farm frequency model and controller parameters stability region
, Article ISA Transactions ; Volume 74 , 2018 , Pages 175-184 ; 00190578 (ISSN) ; Bahrami, S ; Ranjbar, A. M ; Sharif University of Technology
ISA - Instrumentation, Systems, and Automation Society
2018
Abstract
In most of the existing studies, the frequency response in the variable speed wind turbines (VSWTs) is simply realized by changing the torque set-point via appropriate inputs such as frequency deviations signal. However, effective dynamics and systematic process design have not been comprehensively discussed yet. Accordingly, this paper proposes a proportional-derivative frequency controller and investigates its performance in a wind farm consisting of several VSWTs. A band-pass filter is deployed before the proposed controller to avoid responding to either steady state frequency deviations or high rate of change of frequency. To design the controller, the frequency model of the wind farm is...
Optimal robust first-order frequency controller design for DFIG-based wind farm utilising 16-plant theorem
, Article IET Renewable Power Generation ; Volume 12, Issue 3 , 2018 , Pages 298-310 ; 17521416 (ISSN) ; Salehi Dobakhshari, A ; Ranjbar, A. M ; Sharif University of Technology
Institution of Engineering and Technology
2018
Abstract
With increasing the share of wind farms in generation profile, their contribution to frequency regulation has become crucial. This study presents an optimal robust first-order frequency controller in the wind farms, which collectively emulates the inertial response as well as governor droop of synchronous generators. To account for various uncertainties associated with system inertia, damping, and doubly-fed induction generator (DFIG)-based wind turbine's parameters, the robustness of controller is verified through the 16-plant theorem. An analytic method based on the small-signal model of the system is utilised to determine the stability region of the first-order controller. To evaluate the...
Dynamic participation of wind farms in system frequency control
, Article IEEE PES Innovative Smart Grid Technologies Conference Europe, 14 October 2012 through 17 October 2012 ; October , 2012 ; 9781467325974 (ISBN) ; Ranjbar, A. M ; Karimi, H ; Shiroie, M ; Sharif University of Technology
2012
Abstract
In this paper, the participation of wind farms in load frequency control (LFC) is studied. A previously proposed macromodel for the wind farm is employed to regulate its output power. The wind farm including its proposed control strategy is incorporated into the conventional LFC model. The proposed LFC structure is able to dynamically maintain the system frequency at the nominal value against the power imbalances. To achieve proper transient response, the integral control parameter of the LFC controller is optimized using the genetic algorithm (GA). To verify the effectiveness of the proposed method, several simulation case studies are carried out. The results show that the wind farm can...
Application of edge theorem for robust stability analysis of a power system with participating wind power plants in automatic generation control task
, Article IET Renewable Power Generation ; Volume 11, Issue 7 , 2017 , Pages 1049-1057 ; 17521416 (ISSN) ; Bahrami, S ; Ranjbar, A. M ; Sharif University of Technology
Institution of Engineering and Technology
2017
Abstract
This study investigates the dynamic participation of wind power plants (WPPs) in the automatic generation control (AGC) task. The pre-specified model of wind farm in the AGC studies has been used. It is shown that operating of WPPs at the command mode results in a significant improvement in the frequency behaviour of power system due to their faster response. However, the WPPs may change their operation mode from the command mode to the maximum power point mode according to the wind speed conditions and load variations. This reduces the improvement in the frequency response. In this condition, the shortage in the wind power should be compensated by the conventional units. Thus, the share of...
Influence of model simplifications and parameters on dynamic performance of grid connected fixed speed wind turbines
, Article 19th International Conference on Electrical Machines, ICEM 2010, 6 September 2010 through 8 September 2010, Rome ; 2010 ; 9781424441754 (ISBN) ; Rabiee, A ; Parniani, M ; Sharif University of Technology
2010
Abstract
With the rising penetration of wind power into electric power systems, more accurate and comprehensive studies are required to identify the interaction between wind farm(s) and power system. This requires accurate models of different types of wind turbine-generators. This paper describes modeling and small signal analysis of a grid connected fixed speed wind turbine generator (FSWTG). A complete model of FSWTG is derived and some reduced-order models are deduced. Eigenvalues and participation factors of the system for these models are calculated. Then, using the eigen analysis results, the models are compared and the simplifying assumptions which have been considered in the literatures are...
Wind farm optimal connection to transmission systems considering network reinforcement using cost-reliability analysis
, Article IET Renewable Power Generation ; Volume 7, Issue 6 , 2013 , Pages 603-613 ; 17521416 (ISSN) ; Hosseini, S. H ; Sharif University of Technology
2013
Abstract
In this study, a novel network reinforcement model incorporating optimal wind farms (WFs) integration to power systems is proposed. Based on the reinforcement model, new transmission lines are added to the network for eliminating the transmission network congestion. In addition, a methodology for determining the WFs optimal capacities, the economical WF lines transfer rates and the appropriate reinforcement plan, whereas maximising the total benefit using cost-reliability analysis is presented. In this way, the objective of the proposed optimisation problem has been divided into a master problem and two subproblems. Benders decomposition is employed to connect the master and subproblems of...
IGDT-based multi-stage transmission expansion planning model incorporating optimal wind farm integration
, Article International Transactions on Electrical Energy Systems ; Volume 25, Issue 10 , July , 2015 , Pages 2340-2358 ; 20507038 (ISSN) ; Hosseini, S. H ; Sharif University of Technology
John Wiley and Sons Ltd
2015
Abstract
In this paper, a new transmission expansion planning (TEP) model considering wind farms (WFs) optimal integration to power systems is proposed based on the information-gap decision theory (IGDT). The uncertainties of WFs output power and forecasted demand are considered in the problem, and IGDT is used to control the investment risk as well as to reduce the effects of these uncertainties on the investors' strategies. The TEP model is formulated for the risk-averse and risk-seeker investors through the robustness and opportunity models, respectively. Moreover, this TEP model allows WF lines and network lines to be added at multiple time points during a multi-stage time horizon. A genetic...
Scenario-based probabilistic multi-stage optimization for transmission expansion planning incorporating wind generation integration
, Article Electric Power Systems Research ; Volume 189 , 2020 ; Hosseini, S. H ; Javadi, M. S ; Catalão, J. P. S ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
Integrated transmission expansion planning (TEP) and generation expansion planning (GEP) with Wind Farms (WFs) is addressed in this paper. The optimal number of expanded lines, the optimal capacity of WFs installed capacity, and the optimal capacity of wind farms lines (WFLs) are determined through a new TEP optimization model. Furthermore, the optimum capacity additions including conventional generating units is obtained in the proposed model. The Benders decomposition approach is used for solving the optimization problem, including a master problem and two sub-problems with internal scenario analysis. In order to reduce the computational burden of the multi-year and multi-objective...
New approach for strategic bidding of gencos in energy and spinning reserve markets
, Article Energy Conversion and Management ; Volume 48, Issue 7 , 2007 , Pages 2044-2052 ; 01968904 (ISSN) ; Ranjbar, A. M ; Shirani, A. R ; Sharif University of Technology
2007
Abstract
In restructured and de-regulated power systems, generating companies (Gencos) are responsible for supplying electricity for both energy and reserve markets, which usually operate simultaneously. In this condition, the question is how much and for what price must each Genco generate for each market to maximize its profit, so this paper intends to answer to this question. In this paper, first, the combined energy and reserve markets are considered, and the Nash equilibrium points are determined. Then, the bidding strategies for each Genco at these points will be presented. The bids for the energy and 10 min spinning reserve (TMSR) markets are separated in the second stage, and again, the...
Two-level distributed demand-side management using the smart energy hub concept
, Article 10th International Conference on Applied Energy, ICAE 2018, 22 August 2018 through 25 August 2018 ; Volume 158 , 2019 , Pages 3052-3063 ; 18766102 (ISSN) ; Sheykhha, S ; Azimi, M. R ; Madlener, R ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
Demand-side management (DSM) and the integration of the energy hub concept as a main part of future energy networks play an essential role in the process of improving the efficiency and reliability of the power grids. In this paper, we consider a smart multi-carrier energy system in which users are equipped with energy storage and conversion devices (i.e., an energy hub). Users intend to reduce their energy payment by shifting energy consumption to off-peak hours and switching between different energy carriers. This system enables both users with shiftable loads and must-run loads to be active in a DSM program. We apply game theory to formulate the energy consumption and conversion for a...
An integrated two-level demand-side management game applied to smart energy hubs with storage
, Article Energy ; Volume 206 , 2020 ; Sheykhha, S ; Madlener, R ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
Energy hubs, an important component of future energy networks employing distributed demand-side management, can play a key role in enhancing the efficiency and reliability of power grids. In power grids, energy hub operators need to optimally schedule the consumption, conversion, and storage of available resources based on their own utility functions. In sufficiently large networks, scheduling an individual hub can affect the utility of the other energy hubs. In this paper, the interaction between energy hubs is modeled as a congestion game. Each energy hub operator (player) participates in a dynamic energy pricing market and tries to maximize his/her own payoff when satisfying energy...
Two-level distributed demand-side management using the smart energy hub concept
, Article 10th International Conference on Applied Energy, ICAE 2018, 22 August 2018 through 25 August 2018 ; Volume 158 , 2019 , Pages 3052-3063 ; 18766102 (ISSN) ; Sheykhha, S ; Azimi, M. R ; Madlener, R ; Yang H. X ; Li H ; Chen X ; Yan J ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
Demand-side management (DSM) and the integration of the energy hub concept as a main part of future energy networks play an essential role in the process of improving the efficiency and reliability of the power grids. In this paper, we consider a smart multi-carrier energy system in which users are equipped with energy storage and conversion devices (i.e., an energy hub). Users intend to reduce their energy payment by shifting energy consumption to off-peak hours and switching between different energy carriers. This system enables both users with shiftable loads and must-run loads to be active in a DSM program. We apply game theory to formulate the energy consumption and conversion for a...
Interval type-2 fuzzy modeling of wind power generation in Genco's generation scheduling
, Article Electric Power Systems Research ; Volume 81, Issue 8 , 2011 , Pages 1696-1708 ; 03787796 (ISSN) ; Vakilian, M ; Sharif University of Technology
Abstract
Wind power is a promising source of electric power generation since it has tremendous environmental and social benefits. The generation scheduling (GS) problem encounters several uncertainties in terms of the system's parameters such as load, reserve and available wind power generation. The modeling of those uncertainties is an important issue in power system scheduling. A fuzzy based modeling approach can be used to develop the generation schedule under an uncertain environment. In this paper, the type-2 fuzzy membership function (MF) is implemented to model the linguistic uncertainty of type-1 MF of available wind power generation which stems from opinions of different experts. The...
Fuzzy generation scheduling for a generation company (GenCo) with large scale wind farms
, Article Energy Conversion and Management ; Volume 51, Issue 10 , 2010 , Pages 1947-1957 ; 01968904 (ISSN) ; Vakilian, M ; Sharif University of Technology
Abstract
Wind power is a promising alternative in power generation because of its tremendous environmental and social benefits. Generation scheduling (GS) is more important in a power system integrating wind farms. Unlike conventional power generation sources, wind power generators supply intermittent power because of uncertainty in resource. This paper presents a fuzzy approach to the generation scheduling problem of a GenCo considering uncertainties in parameters or constraints such as load, reserve and available wind power generation. The modeling of constraints is an important issue in power system scheduling. A fuzzy optimization approach is an approach that can be used to obtain the generation...
Stochastic unit commitment of wind farms integrated in power system
, Article Electric Power Systems Research ; Volume 80, Issue 9 , Jan , 2010 , Pages 1006-1017 ; 03787796 (ISSN) ; Vakilian, M ; Sharif University of Technology
2010
Abstract
Integration of wind power generation creates new concerns for operation engineers in a power system. Unlike conventional power generation sources, wind power generators supply intermittent power due to uncertainty in parameters of wind such as its velocity. This paper presents probabilistic model for load and wind power uncertainty which can be used in operation planning (with durations up to one or two years). A stochastic model is proposed to simulate the status of units that are directly affected by the load and wind power generation uncertainties. This paper develops a solution method for generation scheduling of power system, while taking into account the stochastic behavior of the load...
Fuzzy based generation scheduling of power system with large scale wind farms
, Article 2009 IEEE Bucharest PowerTech: Innovative Ideas Toward the Electrical Grid of the Future ; 2009 ; 9781424422357 (ISBN) ; Vakilian, M ; Sharif University of Technology
Abstract
Wind power introduces a new challenge to system operators. Unlike conventional power generation sources, wind power generators supply intermittent power because of uncertainty in its resource. In a power system involved largescale wind power generation scenario, wind intermittency could oblige the system operator to allocate a greater reserve power, in order to compensate the possible mismatch between predicted and the actual wind power output. This would increase the total operation cost. This paper presents a new approach in fuzzy based generation scheduling (GS) problem using mixed integer nonlinear programming (MINLP). While the reserve requirements, load generation balance and wind...
Electricity generation scheduling with large-scale wind farms using particle swarm optimization
, Article Electric Power Systems Research ; Volume 79, Issue 5 , 2009 , Pages 826-836 ; 03787796 (ISSN) ; Vakilian, M ; Sharif University of Technology
2009
Abstract
Large-scale integration of wind power in the electricity system presents some planning and operational difficulties, which are mainly due to the intermittent and difficult nature of wind prediction process. Therefore it is considered as an unreliable energy source. This paper presents a new approach for solving the generation scheduling (GS) problem. It will consider the reserve requirement, load balance and wind power availability constraints. The particle swarm optimization (PSO) method is suggested to deal with the equality and inequality constraints in the GS problem. The proposed PSO is applied to a 12-unit test system (including 10 conventional thermal generating units and 2 wind...
Economic evaluation of micro-turbines in Iranian electric industry
, Article 2007 IEEE Lausanne POWERTECH, Lausanne, 1 July 2007 through 5 July 2007 ; 2007 , Pages 1776-1779 ; 9781424421909 (ISBN) ; Sharif University of Technology
2007
Abstract
Today the electric utility industry is being restructured from monopoly and regulated structure to competitive and deregulated structure. Changes in electricity markets, in technology, economics and regulatory structures have created a new interest in small-scale generation and efficiency resources, dispersed throughout the lower voltage networks. Many reasons have been developed and encouraged using DG (Distributed Generation) in different countries such as power system restructuring, DG technologies advances and price increases. The most important problems of many developing countries is the high cost of finance and limited access to financial resources because of the electric industry is...