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    Power System Frequency Control Enhancement Considering Wind Power Plants Participation

    , Ph.D. Dissertation Sharif University of Technology Toulabi, Mohammad Reza (Author) ; Ranjbar, Ali Mohammad (Supervisor)
    Synthetic inertial frequency response has attracted increasing attention due to the paradigm shift in power generation from synchronous generators toward wind turbines. Due to application of back-to-back converters in the structure of variable speed wind turbines (VSWTs), their shaft speeds become decoupled from the system frequency and thus, they cannot provide intrinsic inertial response. However, this type of response can be emulated via an extra auxiliary frequency controller or by modifying the conventional control system of the VSWTs. To achieve this goal, a frequency model of VSWT is developed in this dissertation. The power system's load-generation mismatch model is integrated into... 

    Stochastic security-constrained unit commitment with arma-based wind modelling considering network uncertainties

    , Article International Journal of Renewable Energy Research ; Volume 3, Issue 1 , 2013 , Pages 132-137 ; 13090127 (ISSN) Abdollahi Mansoorkhani, H ; Kia, M ; Sahebi, M. M ; Pishvaie, M ; Sharif University of Technology
    This paper proposes a short-term stochastic SCUC model that simultaneously schedules generating units' energy and spinning reserve in presence of wind energy. It should be noted that system uncertainties, wind farm output uncertainties and power generators and lines outages are also considered in optimization process. The proposed stochastic SCUC model is formulated as a two-stage stochastic mixed-integer programming model. Performance of the proposed formulation is proved through test systems and the results are also presented  

    Offshore wind farm layout optimization using particle swarm optimization

    , Article Journal of Ocean Engineering and Marine Energy ; Volume 4, Issue 1 , 2018 , Pages 73-88 ; 21986444 (ISSN) Pillai, A.C ; Chick, J ; Johanning, L ; Khorasanchi, M ; Sharif University of Technology
    Springer International Publishing  2018
    This article explores the application of a wind farm layout optimization framework using a particle swarm optimizer to three benchmark test cases. The developed framework introduces an increased level of detail characterizing the impact that the wind farm layout can have on the levelized cost of energy by modelling the wind farm’s electrical infrastructure, annual energy production, and cost as functions of the wind farm layout. Using this framework, this paper explores the application of a particle swarm optimizer to the wind farm layout optimization problem considering three different levels of wind farm constraint faced by modern wind farm developers. The particle swarm optimizer is found... 

    Analysis and Performance Evaluation of Manjil Wind Farm

    , M.Sc. Thesis Sharif University of Technology Delkhosh Abatari, Hamed (Author) ; Parniani, Mostafa (Supervisor)
    This project aims to evaluate the performance of turbine generators of various kinds that are used in Manjil wind farm, based on the measured results over a period of operation and comparing them with simulation results of the same turbine generators. It also contains a comparative study with newer types of variable speed. The results of this study can be useful to examine the actual results of operation and design characteristics of the existing turbine, and also the possible advantages of using variable speed wind turbines at Manjil wind farm. Other goal of this project is to evaluate the performance of wind farm thorough turbines’ simulation results and measured result of plant’s fiders... 

    Study of HVDC Transmission for Offshore Wind Farms Based on Voltage Source Converters

    , M.Sc. Thesis Sharif University of Technology Safaeian, Reza (Author) ; Parniani, Mostafa (Supervisor)
    In this thesis, DC transmission of offshore wind farms is studied thoroughly. Various system configurations that are introduced in the literatures are discussed and their control scheme for normal conditions and grid faults are studied. Then, the HVDC transmission based on voltage source converter, located between a local offshore ac grid and the onshore ac system is investigated as the most practical choice. The HVDC linke circuit elements are calculated and the control strategies of the offshore and onshore converters are introduced. DFIGs are considered to be the best choice for the offshore wind turbine generators. Then, the system is simulated and the frequency of the offshore grid is... 

    Transmission Expansion Planning Considering Optimal Wind Farms Integration

    , Ph.D. Dissertation Sharif University of Technology Taherkhani, Morteza (Author) ; Hosseini, Hamid (Supervisor)
    The significant growth of wind generation in power systems, in form of wind farms connected to transmission networks, is changing the present transmission reinforcement planning in the mid-term horizon and transmission expansion planning in the long-term horizon approaches. In this thesis, the optimal wind farms integration to the power system and uncertainty of wind farms output power are considered as two major items in the proposed models and the novel transmission reinforcement and expansion planning models considering optimal wind farms integration are presented. According to these models, the optimal capacity of wind farms and wind farms lines, and the new transmission lines of the... 

    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) Taherkhani, M ; Hosseini, S. H ; Sharif University of Technology
    John Wiley and Sons Ltd  2015
    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... 

    Techno-Economic Site-Specific Sizing Optimization of Wind Turbines

    , M.Sc. Thesis Sharif University of Technology Rezaei Mirghaed, Mohammad (Author) ; Roshandel, Ramin (Supervisor)
    The present study was aimed at developing a model to optimize the sizing of wind turbines according to the region’s wind condition and the capital costs of each part of the turbine. The proposed model, which consists of technical aerodynamic, economic and optimization sub-models, is used to achieve maximum annual energy production by a fixed cost of a single or a number of wind turbines. A cost model has been used to determine the detailed cost of the turbine’s components. The model’s results are presented for two regions in Iran, Khaf and Ahar, and the optimized configurations for a single turbine and a wind farm have been investigated.A case study for the region- Manjil that has some... 

    Power System Load Frequency Control Considering Renewable Energy Sources

    , M.Sc. Thesis Sharif University of Technology Toulabi, Mohammad Reza (Author) ; Ranjbar, Ali Mohammad (Supervisor)
    Power system frequency regulation entitled load frequency control (LFC) has been one of the important control problems in electric power system design and operation. Off-normal frequency can directly impact on power system operation and system reliability. A large frequency deviation can damage equipment, degrade load performance, cause the transmission lines to be overloaded and can interfere with system protection schemes, ultimately leading to an unstable condition for the power system . On the other hand, the increasing need for electrical energy in the 21st century, as well as limited fossil fuel reserves and the increasing concerns with environmental issues for the reduction of carbon... 

    Wind Farm Layout Optimization

    , M.Sc. Thesis Sharif University of Technology Kiamehr, Koosha (Author) ; Kazemzadeh Hannani, Siamak (Supervisor)
    In this work, wind farm layout optimization problem is dealt with a new approach. The aim of this work is maximizing the output power of a wind farm by considering wake loses. Layout optimization minimizes the wake loses regarding the wind direction. Three different wind scenarios including different wind direction angles, wind direction blowing probabilities and Weibull distribution parameters for wind speed are assumed. Since, the problem is nonlinear and constrained, imperialist competitive algorithm is used as a modern and powerful algorithm for continuous optimization problems. The optimization outcomes indicate that imperialist competitive algorithm yields promising results.... 

    Wind Farm Power Optimization Using Cooperative Game Control Methods

    , M.Sc. Thesis Sharif University of Technology Deljouyi, Nasim (Author) ; Nobakhti, Amin (Supervisor)
    This research studies the application of coopeartive control and game theoretic approaches in the field of wind farm optimization. The conventional (greedy) wind farm control strategy seeks to individually maximize the power of each turbine.However, due to the presence of aerodynamic interactions (wake effect) between turbines, this strategy will not lead to maximum overall farm power. Accordingly, this study formulates the wind farm power optimization problem as an identical interest game which is utilized to deal with cooperative control problems in general, and the wind farm control problem in particular. Two distributed model-free learning algorithms are then applied to obtain the... 

    UWB wireless: A scheme for SCADA communications in offshore wind farms

    , Article International Journal of Ultra Wideband Communications and Systems ; Volume 3, Issue 2 , 2015 , Pages 59-67 ; 1758728X (ISSN) Salehinejad, H ; Talebi, S ; Rashidinejad, M ; Sharif University of Technology
    Inderscience Enterprises Ltd  2015
    Utilisation of reliable communication technologies for data communication is a key challenge in smart grids. Due to specific characteristics of offshore wind farms (OWFs), wireless data communications is of interest for supervisory control and data acquisition (SCADA) communication between wind towers. The ultra-wideband (UWB) communication technology is one of the state-of-the-art communication technologies suitable for inexpensive, low-data rate, outdoor, long-range, communication applications. However, in order to employ it in OWFs, its link modelling and performance must first be well analysed comprehensively. In this paper, the UWB communication channel is modelled in OWFs and with... 

    Wind Farm Modeling for Power System Stability Studies

    , M.Sc. Thesis Sharif University of Technology Mirnezhad, Hosein (Author) ; Parniani, Mostafa (Supervisor)
    Considering the continuous growth of renewable energy sources in electric grids, the importance of utilizing simple, generic, and upgradable models for different network stability studies is increasing. In recent years, generic and standard wind turbine models for transient and short-term frequency and voltage stability studies have been developed. In this regard, researchers are still working on promotion of the generic models, especially to expand them for unbalanced transient studies, improve the transient response, and include inertia response. In this thesis, different methods for generic modeling of wind turbines are surveyed and the development procedure of WECC and IEC generic model... 

    Determining the Optimal Level of Reserve in Power Systems with High Penetration of Wind Energy

    , M.Sc. Thesis Sharif University of Technology Riahinia, Shahin (Author) ; Abbaspour Tehrani Fard, Ali (Supervisor) ; Fotuhi-Firuzabad, Mahmud (Co-Advisor)
    Shortage in fossil fuels resources together with the pollution concerns have caused a systematic change in power system planners and decision makers policies to renewable energies as an alternative to produce electrical energy. However, some intrinsic features of the wind energy overshadow its profitability. Inability to predict the wind speed changes and consequently the output level of wind turbines, being an uncontrollable generation unit, and also being an intermittent unit can be accounted as the main attributes of renewable-based units. Taking into account these features, one can conclude that new challenges can be brought into existence in planning and operation issues of... 

    Planning of Energy Storage Systems in the Restructured Environment by Considering Uncertainties

    , M.Sc. Thesis Sharif University of Technology Barkom, Ehsan (Author) ; Ehsan, Mahdi (Supervisor)
    Energy storage is a pivotal technology to dealing with increasing demand for reliability and challenges of renewable energy integration. This thesis provides a benders decomposition framework for expansion studies of energy storage systems (ESSs) in high wind penetrated power system and uncertainties of wind farms expansion and wind speed. This work proposes probabilistic and robust approaches to determine the optimal location and size of storage devices to reduse wind curtailment. The proposed methodologies are implemented on the modified IEEE 73-bus test system and their anticipated applicability are compared to each other and well verified  

    Wind farm layout optimization using imperialist competitive algorithm

    , Article Journal of Renewable and Sustainable Energy ; Vol. 6, Issue. 4 , July , 2014 ; ISSN: 19417012 Kiamehr, K ; Hannani, S. K ; Sharif University of Technology
    In this work, the wind farm layout optimization problem is dealt with using a new approach. The aim of wind farm layout optimization is to maximize the output power of a wind farm considering the wake losses. Layout optimization minimizes the wake losses regarding the location of the turbines. Three different wind scenarios with different wind direction angles, wind direction blowing probabilities, and Weibull distribution parameters are assumed. Since, the problem is nonlinear and constrained, imperialist competitive algorithm is used as a modern and powerful algorithm for continuous optimization problems. The optimization outcomes indicate that imperialist competitive algorithm yields... 

    Impact of correlation on reserve requirements of high wind-penetrated power systems

    , Article International Journal of Electrical Power and Energy Systems ; Volume 73 , 2015 , Pages 576-583 ; 01420615 (ISSN) Riahinia, S ; Abbaspour, A ; Fotuhi Firuzabad, M ; Moeini Aghtaie, M ; Sharif University of Technology
    Elsevier Ltd  2015
    This paper investigates the effects of two important factors, i.e., correlation of wind farms output with load and wind speed coincidence in determining the required static reserve in a high wind-penetrated power system. To this end, it suggests an analytical approach to involve the effects of these two factors in probabilistic analytical multi-state models of wind farms output generation. Based on an optimization framework with the objective of reaching the desirable level of correlation, the key idea is to calculate some joint probabilities for equivalent models of wind farms. As a result, these models become compatible with the ones for conventional generation units in adequacy studies of... 

    An analytical framework for operational reliability studies of highly wind integrated power systems

    , Article 2016 International Conference on Probabilistic Methods Applied to Power Systems, PMAPS 2016 - Proceedings, 16 October 2016 through 20 October 2016 ; 2016 ; 9781509019700 (ISBN) Parvini, Z ; Abbaspour, A ; Fotuhi Firuzabad, M ; Moeini Aghtaie, M ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2016
    This paper presents a new framework for evaluating contribution of wind farms in operational reliability level of power systems. In this regard, at first, it provides a short-term analytical model well designed to represent intermittent and uncertain nature of wind power. Combining the attained multi-state model of wind farms with the other committed generating units, operational risk of the system is evaluated. The concept of Pennsylvania-New Jersey-Maryland (PJM), previously developed to assess the short-term/mid-term reliability of conventional generating units, is revisited in this paper to more practically incorporate wind farms in reliability studies of the power system. The proposed... 

    Incorporating large-scale distant wind farms in probabilistic transmission expansion planning-part I: Theory and algorithm

    , Article IEEE Transactions on Power Systems ; Vol. 27, issue. 3 , 2012 , p. 1585-1593 ; ISSN: 08858950 Moeini-Aghtaie, M ; Abbaspour, A ; Fotuhi-Firuzabad, M ; Sharif University of Technology
    With increment in the penetration of wind energy in power systems, the necessity of considering its impacts on transmission expansion planning (TEP) studies, especially for large scale wind farms, is inevitable. A new multi-objective (MO) optimization transmission expansion planning algorithm considering wind farm generation is presented in this two-paper set. Part I is mainly devoted to derivation of the theory and algorithm. The objective functions used in the TEP studies take into account investment cost, risk cost and congestion cost. The combination of Monte Carlo simulation (MCS) and Point Estimation Method (PEM) is implemented to investigate the effects of network uncertainties. Due... 

    On the use of pumped storage for wind energy maximization in transmission-constrained power systems

    , Article IEEE Transactions on Power Systems ; Volume 30, Issue 2 , 2015 , Pages 1017-1025 ; 08858950 (ISSN) Hozouri, M. A ; Abbaspour, A ; Fotuhi Firuzabad, M ; Moeini Aghtaie, M ; Sharif University of Technology
    Owing to wind power inherent characteristics and technical constraints of power systems operation, a considerable amount of wind energy cannot be delivered to load centers and gets curtailed. Transmission congestion together with temporal mismatch between load and available wind power can be accounted as the main reasons for this unpleasant event. This paper aims to concentrate on the wind energy curtailment for which it provides a combinatorial planning model to maximize wind power utilization. Jointly operating the wind power generation system with pumped hydro energy storage (PHES), the planning procedure tries to reach schemes with the minimum level of wind energy curtailment as well as...