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    Optimal installation capacity of medium hydro-power plants considering technical, economic and reliability indices

    , Article International Journal of Power and Energy Systems ; Volume 28, Issue 1 , 2008 , Pages 15-22 ; 10783466 (ISSN) Hosseini, S. M. H ; Forouzbakhsh, F ; Fotuhi Firuzabad, M ; Sharif University of Technology
    Acta Press  2008
    One of the most important issues in planning the reservoir type of Medium Hydro-Power Plants (MHPP) is to determine the optimal installation capacity of the MHPP and estimate its optimal annual energy value. In this paper, a method is presented to calculate the annual energy. A computer program has been developed to analyse energy calculation and estimation of the most important economic indices of an MHPP using the sensitivity analysis method. Another program, developed by Matlab software, calculates the reliability indices for a number of units of an MHPP with a specified load duration curve using the Monte Carlo method. Ultimately, comparing the technical, economic and reliability indices... 

    Reliability modeling and availability analysis of combined cycle power plants

    , Article International Journal of Electrical Power and Energy Systems ; Volume 79 , 2016 , Pages 108-119 ; 01420615 (ISSN) Sabouhi, H ; Abbaspour, A ; Fotuhi Firuzabad, M ; Dehghanian, P ; Sharif University of Technology
    Elsevier Ltd 
    Power plant successful operation is always a function of its constituent sub-systems and components. Due to the current financial constraints in power industry, power plant operators are continuously facing a wide range of challenges when dealing with maintenance scheduling and asset management practices of the plant sub-systems. Knowledge on the roles and criticality of the constituent components on the plant overall performance will help in establishing the plans for its smooth, safe, and economic operation. To ensure making the techno-economical decisions on the maintenance of power plant equipment, this paper focuses on the reliability modeling of the combined cycle power plants (CCPP).... 

    Modeling and Simulation of Hydro-Power Station and Determination and Evaluation of Governor Design Specifications

    , M.Sc. Thesis Sharif University of Technology Amir Nazmi Afshar, Peyman (Author) ; Durali, Mohammad (Supervisor)
    The main objective of this project is to take the first steps in designing power plants governor in Iran. In this work, we obtain a realistic model of a hydro-power plant including hydraulic characteristics from the dam to the outlet tail water, mechanically including: the turbine, the gates and all mechanical and dynamic parts, and electrically including generators, transformers and the consumption network. The model is used to simulate different working modes of turbine operation. The Bond Graph method is used for deriving the system equations and MATLAB software for simulations. A conceptual design of the governor is done and the governor model is combined with the turbine model. Using... 

    Exergy analysis and thermodynamic optimisation of a steam power plant-based Rankine cycle system using intelligent optimisation algorithms

    , Article Australian Journal of Mechanical Engineering ; 2019 ; 14484846 (ISSN) Elahifar, S ; Assareh, E ; Moltames, R ; Sharif University of Technology
    Taylor and Francis Ltd  2019
    In this paper, exergy analysis of a steam power plant located in southern Iran named Zarand power plant has been studied. In order to optimize the performance of the Rankine cycle and achieve higher exergy efficiency, several parameters have been considered as decision variables. Knowing that there is the ability to change some of the parameters in the specific range in the process of electricity production in power plant, temperature and output pressure of the boiler and output pressure of four steps of extraction turbine have been selected as six decision variables. Also, exergy efficiency has been considered as the objective function. For this purpose, the exergy efficiency of the system... 

    Greenhouse gas emission measurement and economic analysis of Iran natural gas fired power plants

    , Article Energy Policy ; Volume 60 , 2013 , Pages 200-207 ; 03014215 (ISSN) Shahsavari Alavijeh, H ; Kiyoumarsioskouei, A ; Asheri, M. H ; Naemi, S ; Shahsavari Alavije, H ; Basirat Tabrizi, H ; Sharif University of Technology
    This study attempts to examine the natural gas fired power plants in Iran. The required data from natural gas fired power plants were gathered during 2008. The characteristics of thirty two gas turbine power plants and twenty steam power plants have been measured. Their emission factor values were then compared with the standards of Energy Protection Agency, Euro Union and World Bank. Emission factors of gas turbine and steam power plants show that gas turbine power plants have a better performance than steam power plants. For economic analysis, fuel consumption and environmental damages caused by the emitted pollutants are considered as cost functions; and electricity sales revenue are... 

    Optimal tuning of temporary droop structure governor in the hydro power plant

    , Article 2008 IEEE 2nd International Power and Energy Conference, PECon 2008, Johor Baharu, 1 December 2008 through 3 December 2008 ; 2008 , Pages 100-105 ; 9781424424054 (ISBN) Abdolmaleki, M ; Ranjbar, A. M ; Ansarimehr, P ; Borjian Boroujeni, S ; Sharif University of Technology
    Load-frequency control is the intrinsic function of the governor in the power plants. It would be used in variant structures depend on the controller type such as PID, adaptive, fuzzy or robust. Temporary droop structure governor (TDSG) was commonly used in Hydro power plants (HPP). After representation of TDSG, this paper is dedicated to introducing a procedure for tuning TDSG parameters. The technique is based on pole placement for the closed loop poles of the system. These poles correspond to the TDSG parameters that by accurate tuning of them, pole placement is accomplished. The results for tuning TDSG of Abbaspour HPP have been presented as well. © 2008 IEEE  

    Assessment of BNPP Containment Systems, Against LB-LOCA by MELCOR Code

    , M.Sc. Thesis Sharif University of Technology Heydari Lari Nejad, Mohammad Amin (Author) ; Ghofrani, Mohammad Bagher (Supervisor)
    In this study the modeling of Bushehr power plant containment is considered. In Bushehr atomic power plant, which has a unique design, the containment is similar to PWR power plants with a metal sphere, but the installed reactor is a VVER-1000. After a full study on the containment and its systems, the required date for modeling is gathered and afterwards, the engineering handbook is prepared for MELCOR input code and then the modeling and size classification of the containment is done in 4 different ways, including the control volumes of 1, 9, 23 and 30 and then the temperature, pressure and density of hydrogen is examined. The result of studying control volume sensitivity reveals that 23... 

    Determination of installation capacity in reservoir hydro-power plants considering technical, economical and reliability indices

    , Article International Journal of Electrical Power and Energy Systems ; Volume 30, Issue 6-7 , 2008 , Pages 393-402 ; 01420615 (ISSN) Hosseini, S. M. H ; Forouzbakhsh, F ; Fotouhi, M ; Vakilian, M ; Sharif University of Technology
    One of the most important issues in planning the "reservoir" type of hydro-power plants (HPP) is to determine the installation capacity of the HPPs and estimate its annual energy value. In this paper, a method is presented. A computer program has been developed to analyze energy calculation and estimation of the most important economic indices of an HPP using the sensitivity analysis method. Another program, developed by Matlab software, calculates the reliability indices for a number of units of an HPP with a specified load duration curve using the Monte Carlo method. Ultimately, comparing the technical, economic and reliability indices will determine the installation capacity of an HPP. By... 

    Analysis of electromechanical oscillations and extended phase compensation design of power system stabilizer for bisotoun power plant

    , Article Iranian Journal of Electrical and Computer Engineering ; Volume 6, Issue 1 , 2007 , Pages 11-18 ; 16820053 (ISSN) Parniani, M ; Zafarabadi, Gh ; Rasouli, M ; Ansarimehr, P ; Sharif University of Technology
    In this paper, performance of power system stabilizer (PSS) of a large thermal power plant, as tuned by the manufacturer, is investigated. Then, the stabilizer is redesigned based on extended phase compensation of the exciter input - electrical torque transfer function and root locus analysis; and its effect on local, interplant and inter-area electromechanical oscillations is thoroughly analyzed. As Bisotoun PSS has a special structure with two inputs, frequency and power, its performance is compared with power-speed PSS. The effect of PSS with existing and new tunings on transient stability is also studied. Simulation results are verified by experimental test records. © 2007 JD  

    Comparison of fuzzy logic and neural network in life prediction of boiler tubes

    , Article International Journal of Fatigue ; Volume 29, Issue 3 , 2007 , Pages 489-498 ; 01421123 (ISSN) Majidian, A ; Saidi, M. H ; Sharif University of Technology
    The life prediction of equipments guarantees reliable, safe, efficient and continuous operation of thermal power plants. In this paper wall thickness of reheater tubes of boiler number 3 of Neka power plant in north of Iran are measured at several points during maintenance shut down periods. Thickness dependency vs. time has been investigated. Artificial Neural Network (ANN) as a tool has been acquired to determine this dependency. Extrapolation of thickness function vs. time applying maximum normal stress criteria results in corresponding thickness. The maximum wall reduction rates have been calculated by two schemes namely Fuzzy function (FF) and Neural Network (ANN) applying numerical... 

    Osmotic Power Plant Design

    , M.Sc. Thesis Sharif University of Technology Ansari, Abolfazl (Author) ; Abbaspour, Majid (Supervisor) ; Mozafari, Ali Asghar (Co-Advisor)
    Research for renewable energy has grown considerably over the last years. Osmotic energy is a form of renewable energy which is not yet used at commercial scale, but have a large potential to used at commercial scale soon. Osmotic power is a technique that converts the difference of molar free energy between fresh water and salt water into electricity. Pressure retarded osmosis (PRO) is the most frequently studied process of osmotic energy. In PRO two solutions of different salinities are brought into contact by a semipermeable membrane that only allows the transport of water and retain the solute. Positive developments in recent years initiated new studies to the exploitation of osmotic... 

    Developing Optimal Model of a Magnetohydrodynamic Generator Based Combined Cycle

    , M.Sc. Thesis Sharif University of Technology Biria, Aisa (Author) ; Saboohi, Yadollah (Supervisor)
    Considering the growing global electricity demand and declining world's fossil fuel resources, developing methods to improve thermal power plants' efficiency and power is of great importance. One method to increase cycle's efficiency is to increase cycle's maximum temperature. MHD generators can be added as a topping cycle to ordinary gas turbine-steam combined cycles, thus increasing cycle's maximum temperature to up to 3000K. In this study a MHD-Gas Turbine-Steam combined cycle has been modeled and optimized. In the high temperatures associated with combustion products plasma, diverse molecular decomposition and ionization processes progress. Therefore, equations of mass, energy, and... 

    Development of an efficient identifier for nuclear power plant transients based on latest advances of error back-propagation learning algorithm

    , Article IEEE Transactions on Nuclear Science ; Vol. 61, issue. 1 , February , 2014 , pp. 602-610 ; ISSN: 00189499 Moshkbar-Bakhshayesh, K ; Ghofrani, M. B ; Sharif University of Technology
    This study aims to improve the performance of nuclear power plants (NPPs) transients training and identification using the latest advances of error back-propagation (EBP) learning algorithm. To this end, elements of EBP, including input data, initial weights, learning rate, cost function, activation function, and weights updating procedure are investigated and an efficient neural network is developed. Usefulness of modular networks is also examined and appropriate identifiers, one for each transient, are employed. Furthermore, the effect of transient type on transient identifier performance is illustrated. Subsequently, the developed transient identifier is applied to Bushehr nuclear power... 

    Experimental analysis of CO2, CO, SO2 and NO x emission factors of Iran's fossil fuel fired power plants

    , Article 2010 IEEE International Energy Conference and Exhibition, EnergyCon 2010, 18 December 2010 through 22 December 2010 ; 2010 , Pages 775-779 ; 9781424493807 (ISBN) Shahsavari Alavijeh, H ; Shahsavari Alavijeh, H ; Kiumarsi Oskuei, A ; Asheri, M. H ; Sharif University of Technology
    In this paper, the effect of different parameters of power plants, such as height above sea level, performance, ambient temperature, fuel type on emissions in Iran's power plants is investigated. Based on that, a general strategy for selecting the type of power plant, fuel that fit with the geographical situation in the Middle East is presented. Results taken from this scientific study shows that using natural gas to generate power in the region should be a priority. As well as expected, the value of various emission factors decrease by increasing power produce. Also the emission factors of combined cycle power plants are the lowest as compared to other types of power plants  

    A multi-operator Imperialist Competitive Algorithm for solving Non-Convex Economic Dispatch problem

    , Article Indian Journal of Science and Technology ; Volume 9, Issue 6 , 2016 ; 09746846 (ISSN) Eghbalpour, H ; Nabati Rad, M ; Hassani, R ; Sharif University of Technology
    Indian Society for Education and Environment 
    Non-Convex Economic Dispatch (NED) has been addressed as an open and demanding optimization problem in power systems. Due to the fact that realistic ED problems have non-convex cost functions with equality and inequality constraints, conventional search methods are unable to effectively find the global solution. In recent years, because of their great potential to achieve optimal or close-to-optimal solution, meta-heuristic optimization techniques have attracted significant attention to tackle the complexity of NED problems. In this paper, an efficient approach is proposed based on Imperialist Competitive Algorithm (ICA). The proposed algorithm named multi-operator ICA (MuICA) merges the... 

    Optimized water consumption considering power plants efficiency in power system generation

    , Article 2019 IEEE International Conference on Industrial Technology, ICIT 2019, 13 February 2019 through 15 February 2019 ; Volume 2019-February , 2019 , Pages 673-678 ; 9781538663769 (ISBN) Ganjkhani, M ; Badakhshan, S ; Azizivahed, A ; Li, L ; Chen, L ; Huang, Q ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2019
    In order to generate adequate electricity energy, conventional power plants utilize dramatic volume of water resources. Different methods such as replacing cutting-edge technologies of facilities have been proposed to diminish water consumption in this industry. Most of the approaches are considered as medium or long-term solution which requires substantial investment costs. Meanwhile, because of the process and technology, natural gas-fired power plants need less water among conventional power plants. Therefore, shifting unit commitment planning toward these power plants would aid to save water consumption. Nevertheless, overlooking combined cycle power plants can perform negative impact on... 

    Managing distributed energy resources (DERS) through virtual power plant technology (VPP): a stochastic information-gap decision theory (IGDT) approach

    , Article Iranian Journal of Science and Technology - Transactions of Electrical Engineering ; Volume 44, Issue 1 , 2020 , Pages 279-291 Alahyari, A ; Ehsan, M ; Moghimi, M ; Sharif University of Technology
    Springer  2020
    As the number of distributed energy resources (DERs) increases, so would their influences on the power systems. Toward managing the intermittent nature of DERs, and providing market participation capability, the concept of virtual power plant (VPP) has been developed in the smart grid era. This paper proposes a novel offering strategy method for a VPP consisting of wind power generation along with storage capacity and flexible demand. In the proposed method, two different sources of uncertainty are addressed: stochastic method, applied in dealing with market price uncertainty, and information-gap decision theory (IGDT), incorporated in the offering model counting for wind power production... 

    Wind speed sensor calibration in thermal power plant using Bayesian inference

    , Article Case Studies in Thermal Engineering ; Volume 19 , June , 2020 Mokhtari, A ; Ghodrat, M ; Javadpoor Langroodi, P ; Shahrian, A ; Sharif University of Technology
    Elsevier Ltd  2020
    Using natural draft dry air cooling systems in the power plant cycle is one of the proposed solutions for less water consumption. But the wind blowing will cause decreasement of cooling system performance in the power plants that work with the Rankin cycle. Therefore, it is important to know the right amount of wind speed to make the right decision to prevent reducing generating power or provide the right solution to improve the performance of the power plant cooling system. There are many methods of calibration of sensors in the world. But using optimization techniques or stochastic methods that do not require physical facilities and additional costs is almost a new approach. Therefore, in... 

    A robust fuzzy logic adaptive PI controller for hydro power plants

    , Article SICE Annual Conference, SICE 2007, Takamatsu, 17 September 2007 through 20 September 2007 ; 2007 , Pages 2592-2595 ; 4907764286 (ISBN); 9784907764289 (ISBN) Abdolmaleki, M ; Ansarimehr, P ; Ranjbar, A. M ; Sharif University of Technology
    The governor of hydro power plants should track frequency variations and at the same time provide good response to load disturbances. These two functions are contradictory and the system model changes with the operating point. This paper presents a robust fuzzy logic adaptive load-frequency controller for hydro power plants. The case study is Abbaspour power plant in Iran. © 2007 SICE  

    A new approach to reduce the dynamic order of induction generators

    , Article International Journal of Power and Energy Systems ; Volume 27, Issue 4 , 2007 , Pages 315-319 ; 10783466 (ISSN) Varahram, M. H ; Behzadi Rafi, S ; Sharif University of Technology
    Acta Press  2007
    Various attempts have been made to derive linearized, reduced order models of induction generators. Due to the fact that there is usually numerous number of these machines in wind power plants, these models provide great facilities in calculations, and therefore are used widely in power system transient stability studies. In this paper, some of these methods are discussed and compared and then a method known as "balanced realizations" is used to reduce the dynamic order of the machine. Computer simulation shows that the last method markedly improves the accuracy of the resulting reduced order model. The improvement is demonstrated by comparing the response characteristics predicted by each...