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    From loss allocation to loss cost allocation: a comparative study of different loss cost allocation methods

    , Article International Transactions on Electrical Energy Systems ; Volume 23, Issue 4 , 2013 , Pages 586-600 ; 20507038 (ISSN) Ghofrani Jahromi, Z ; Ehsan, M ; Fotuhi Firuzabad, M ; Parvania, M ; Sharif University of Technology
    As a high proportion of the total generated electricity energy and the power system costs is due to the power losses in lines, allocating the loss and associated cost to the system loads and generating units is a substantial issue in deregulated power systems. The procedure to accomplish this cost allocation is designated as 'loss cost allocation' (LCA). So far, a number of LCA methods have been proposed for transmission networks. A few papers have compared different loss allocation methods, which are the methods which calculate the loss (and not necessarily the loss cost) allocated to the loads and generating units. However, this paper presents a comparative study of LCA methods. In this... 

    Effects of sampling time on the performance of direct torque controlled induction motor drive

    , Article IEEE International Symposium on Industrial Electronics, ISIE 2003, 9 June 2003 through 11 June 2003 ; Volume II , 2003 , Pages 1049-1052 ; 0780379128 (ISBN) Kaboli, S. H ; Zolghadri, M. R ; Homaifar, A ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2003
    The torque ripple and harmonic loss of motor and switching loss of inverter are greatly influenced by sampling time in the direct torque control method. Hence these variables must be observed in the control process to maximize performance of the system. In this paper the effects of sampling time on inverter switching loss, harmonic loss and torque ripple of induction motor are investigated. To find their optimum values a cost function consisting of motor harmonic losses, torque ripples and inverter switching losses are defined. Minimizing this cost function leads to the optimum value of the sampling time. © 2003 IEEE  

    Optimal fast charging station placing and sizing

    , Article Applied Energy ; Vol. 125 , July , 2014 , pp. 289-299 ; ISSN: 03062619 Sadeghi-Barzani, P ; Rajabi-Ghahnavieh, A ; Kazemi-Karegar, H ; Sharif University of Technology
    Fast charging stations are vital components for public acceptance of electric vehicle (EV). The stations are connected to the electric grid and can recharge an electric vehicle in less than 20. min. Charging station development is highly influenced by the government policy in allocating station development costs. This paper presents a Mixed-Integer Non-Linear (MINLP) optimization approach for optimal placing and sizing of the fast charging stations. The station development cost, EV energy loss, electric gird loss as well as the location of electric substations and urban roads are among the factors included in the proposed approach. Geographic information has been used to determine EV energy...