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    Impacts of load pattern variation in Iran power system on generation system planing

    , Article Canadian Conference on Electrical and Computer Engineering 2005, Saskatoon, SK, 1 May 2005 through 4 May 2005 ; Volume 2005 , 2005 , Pages 2216-2219 ; 08407789 (ISSN) Salimi Beni, A ; Gharagozloo, H ; Fotuhi Firuzabad, M ; Farrokhzad, D ; Sharif University of Technology
    During last decade, the electricity demand in Iran grows up more than 8% per year due to an increasing economic growth. The main part of this load growth is related to industrial and agricultural demand. At this period, electric utilities tried to provide the peak load demand using all different types of available generating units especially with hydro generation plants. However, moving the time of peak demand occurring from night hours to day time and also increasing of load demand at mid day hours, created a new challenge to hydro-generation planning. As the number of daily peak hours increases from the nightly to daily peak hours and considering that Iran is a sub-tropical country, use of... 

    Voltage regulation through smart utilization of potential reactive power resources

    , Article Proceedings - UKSim 5th European Modelling Symposium on Computer Modelling and Simulation, EMS 2011, 16 November 2011 through 18 November 2011, Madrid ; 2011 , Pages 293-298 ; 9780769546193 (ISBN) Kazari, H ; Abbaspour Tehrani Fard, A ; Dobakhshari, A. S ; Ranjbar, A. M ; Sharif University of Technology
    The introduction of demand response concept, in addition to increment of penetration of distributed generation (DG) based on renewable energies, make opportunities for the novel control schemes to be integrated in power system on a smart grid framework. Voltage control methods in power systems needs proper coordination among reactive power resources and conventional volt/var control equipments. In this work, potential reactive power resources are investigated and then, reactive power output of renewable DG units and controllable loads along with operation of conventional voltage controllers are optimized using a centralized control scheme. Considering the variability of demand and... 

    Proposed flux-based optimization method for determination of minimum superconductor material in shield-type superconducting fault current limiters

    , Article Scientia Iranica ; Volume 19, Issue 6 , December , 2012 , Pages 1843-1849 ; 10263098 (ISSN) Hekmati, A ; Vakilian, M ; Fardmanesh, M ; Sharif University of Technology
    Distributed power generation and an ever growing load demand have caused the current level of fault to exceed the nominal rating of power system devices, and fault current limiters are needed even more. The Superconducting Fault Current Limiter, SFCL, forms an efficient category of current limiters. The superconductor part in SFCLs is the most costly part of the device, and minimizing its volume, while maintaining the required characteristics of the device, would be very beneficial. In this work, using a Simulated Annealing optimization algorithm, a method has been proposed to determine minimum required bulk superconductor material in inductive shield-type SFCL structures. The flux linkage... 

    Flux-based modeling of inductive shield-type high-temperature superconducting fault current limiter for power networks

    , Article IEEE Transactions on Applied Superconductivity ; Volume 21, Issue 4 , 2011 , Pages 3458-3464 ; 10518223 (ISSN) Hekmati, A ; Vakilian, M ; Fardmanesh, M ; Sharif University of Technology
    Distributed power generation and the ever-growing load demand have caused fault current levels to exceed the nominal rating of the power system devices, and fault current limiters are more needed. Superconducting fault current limiter (SFCL) forms an important category of current limiters. In this paper, a novel flux-based model for the inductive shield-type high-temperature SFCL is developed based on the Bean model. This model is employed to simulate the SFCL performance in a sample circuit. Utilizing the model, the signal characterization of the limited current is determined. A prototype laboratory scale SFCL has been fabricated with superconducting rings. Yttrium barium copper oxide... 

    Multi objective distributed generation planning using NSGA-II

    , Article 2008 13th International Power Electronics and Motion Control Conference, EPE-PEMC 2008, Poznan, 1 September 2008 through 3 September 2008 ; 2008 , Pages 1847-1851 ; 9781424417421 (ISBN) Ahmadi, M ; Yousefi, A ; Soroudi, A ; Ehsan, M ; Sharif University of Technology
    With the increasing share of distributed generation in electrical energy supply, the proper planning procedure for using these units, has become more vital for power system planners. In this paper, the application of multi-objective optimization techniques for siting, sizing and determination of the proper technology to be used, has been investigated in such a way that, the load demand during the planning horizon is met and the technical and environmental constraints are satisfied. Unlike the traditional optimization methods used in power system optimization, NSGA-II multi-objective optimization algorithm does not consider techno-economical and environmental parameters in the constraints of...