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    Transmission loss allocation via loss function decomposition and current projection concept

    , Article World Academy of Science, Engineering and Technology ; Volume 62 , 2010 , Pages 675-678 ; 2010376X (ISSN) Ebrahimi, M. R ; Ghofrani, Z ; Ehsan, M ; Sharif University of Technology
    2010
    Abstract
    One of the major problems in liberalized power markets is loss allocation. In this paper, a different method for allocating transmission losses to pool market participants is proposed. The proposed method is fundamentally based on decomposition of loss function and current projection concept. The method has been implemented and tested on several networks and one sample summarized in the paper. The results show that the method is comprehensive and fair to allocating the energy losses of a power market to its participants  

    Cause-and-effect relationships affecting distribution loss management

    , Article IEEE PES Innovative Smart Grid Technologies Conference Europe, ISGT Europe, 11 October 2010 through 13 October 2010 ; October , 2010 ; 9781424485109 (ISBN) Ghofrani Jahromi, Z ; Ehsan, M ; Masjed Jamei, M ; Sharif University of Technology
    2010
    Abstract
    There are a lot of parameters which are decisive in distribution loss management, such as demand value, energy price, etc. In this paper the cause-and-effect relationships among some of these variables are clearly described. The study demonstrates how a variable in the model will change, if an alteration in one of the other variables occurs. The power system variables considered in this study include energy and loss prices, generation and demand values, distribution loss, distribution system age, number of customers connected to the smart grid, distribution network revenue, and so forth. The smart grid impacts can be studied from two different aspects: 1) the communication infrastructure... 

    A combinatorial approach for active and reactive power flow tracking

    , Article International Review of Electrical Engineering ; Volume 5, Issue 5 , 2010 , Pages 2209-2216 ; 18276660 (ISSN) Rashidinejad, A ; Habibi, M. R ; Khorasani, H ; Rashidinejad, M ; Sharif University of Technology
    2010
    Abstract
    This paper establishes a simple and topological approach to track real and reactive power flow in electric transmission systems. The presented method utilizes the well-known Proportional Sharing Theorem in order to evaluate the contribution of each power source to grid elements' supplied input power. We have also put forward an approximate power tracing method for upgraded grids, using its own previously surveyed results. The main advantages of the proposed procedure, compared with conventional methods, are discussed extensively. The effectiveness of this approach has been studied and ascertained for small-scale power systems, showing prominent speed and accuracy  

    A practical scheme for transmission loss allocation to generators and loads in restructured power systems

    , Article World Academy of Science, Engineering and Technology ; Volume 79 , 2011 , Pages 448-452 ; 2010376X (ISSN) Ebrahimi, M. R ; Ehsan, M ; Sharif University of Technology
    2011
    Abstract
    This paper presents a practical scheme that can be used for allocating the transmission loss to generators and loads. In this scheme first the share of a generator or load on the current through a branch is determined using Z-bus modified matrix. Then the current components are decomposed and the branch loss allocation is obtained. A motivation of proposed scheme is to improve the results of Z-bus method and to reach more fair allocation. The proposed scheme has been implemented and tested on several networks. To achieve practical and applicable results, the proposed scheme is simulated and compared on the transmission network (400kv) of Khorasan region in Iran and the 14-bus standard IEEE... 

    Introducing a Novel Method of Loss Allocation Based on Power Tracking in the Transactive Energy Market

    , M.Sc. Thesis Sharif University of Technology Koochaki, Mohaddese (Author) ; Moeini Aghtaie, Moein (Supervisor)
    Abstract
    The issue of loss allocation is one of the most important issues that has long been considered in electricity networks, including distribution and transmission. With changes in distribution networks over the years and the penetration of distributed energy sources, the allocation of losses has become more of a challenge than ever before. Hence, there is a need for a loss allocation algorithm that can be implemented in any network and with any topology. In this dissertation, a new, simple and at the same time efficient algorithm for allocating real losses in all networks (distribution - transmission) and with any structure (radial - circular) is presented. This algorithm first tracks the... 

    Distribution loss allocation for radial systems including dgs

    , Article IEEE Transactions on Power Delivery ; Vol. 29, issue. 1 , 2014 , pp. 72-80 ; ISSN: 08858977 Ghofrani-Jahromi, Z ; Mahmoodzadeh, Z ; Ehsan, M ; Sharif University of Technology
    Abstract
    Due to the liberalization of the electricity market and the introduction of distributed generation (DG), the importance of distribution loss allocation (LA) has increased. This paper presents a new method for distribution power LA in radial systems. The proposed method, which is based on the results of power flow and considers active and reactive power flows of lines for LA, is composed of three steps. In the first step, starting from the source nodes (i.e., the nodes whose generation is more than their load), the power loss allocated to all nodes is calculated and then the power loss allocated to the loads connected to each node is obtained. In the next step, the total power loss is... 

    Transactive energy market mechanism with loss implication

    , Article IEEE Transactions on Smart Grid ; Volume 12, Issue 2 , 2021 , Pages 1215-1223 ; 19493053 (ISSN) Azizi, A ; Aminifar, F ; Moeini Aghtaie, M ; Alizadeh, A ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2021
    Abstract
    Electric distribution network is undergoing fundamental transition from conventional top-down structure to an environment where local prosumers, as transactive agents, are able to form peer-to-peer (P2P) energy trades among themselves. One of the challenges in such networks is allocating the incurred losses to the peers of the transactive market through a transparent and fair framework. In this article, it is demonstrated that the existing methods of loss allocation may cause a cross-subsidization problem when it comes to transactive energy systems, and a solution is offered to the problem. Furthermore, a novel transactive market mechanism is proposed which deploys the loss allocated to each... 

    Transmission loss allocation using normalized loss weight factors

    , Article 10th International Conference on Probabilistic Methods Applied to Power Systems, PMAPS 2008, Rincon, 25 May 2008 through 29 May 2008 ; 2008 , Pages 224-228 ; 9781934325216 (ISBN) Keshmiri, S. N ; Ehsan, M ; Sharif University of Technology
    2008
    Abstract
    One of the major problems in liberalized power markets is loss allocation. In this paper, a new method for allocating transmission losses to pool market participants is proposed. The proposed method is fundamentally based on Bialek's "Tracing the flow of electricity" method. The losses is allocated to market participants using the loss weight factors (LWFs) which are obtained from the square current magnitude and Z-bus matrix. The LWF method is based on a solved load flow and strongly emphasizes on current magnitude while considers network topology. The method has been implemented and tested on several networks and one sample summarized in the paper. The results show that the method has an... 

    Investigation of Effect of Muffler Performance on Environmental Pollutants

    , M.Sc. Thesis Sharif University of Technology Khajvand-Sani, Sajad (Author) ; Nouri-Borujerdi, Ali (Supervisor)
    Abstract
    The silencer is used to reduce sound in the vehicle, air conditioning channels, power plants and guns. Functional parameters of the sound amplifier are the amount of noise reduction and pressure drop. There are few studies on the flow and pressure distribution in the silencer, and there is no article about the effect of the size of the internal passages on the pressure drop and acoustical performance of the silencer. Few studies have been done on the effect of the absorbent fiber diameter on the acoustic performance of silencer. In this study, the effect of different shapes of internal channels (extended tubes, baffles and number of chambers) on the pressure drop and acoustic performance of... 

    Calculation and Distribution of Transmission Loss in Restructured Power Systems

    , M.Sc. Thesis Sharif University of Technology Ebrahimi Bojdani, Mohammad Reza (Author) ; Ehsan, Mehdi (Supervisor)
    Abstract
    The electric power industry is experiencing important changes brought about by the deregulation. Electric power generators and users engage in power transactions which take place over the transmission system and create losses. Transmission losses represent up to 1⎯5% of the total generation, and cost millions of dollars per year. Consequently, the problem of “who should pay for losses” arises and the satisfactory sharing of the transmission system utilization costs among all market participants has become a key issue. Unfortunately, losses are expressed as a nonlinear function of line flows, and it becomes almost impossible to calculate exactly the losses that are incurred by each generator,... 

    Loss Management in Smart Distribution Systems

    , Ph.D. Dissertation Sharif University of Technology Ghofrani Jahromi, Zeinab (Author) ; Ehsan, Mehdi (Supervisor)
    Abstract
    One of the topics that has been given great consideration after restructuring and smart grid emergence, is loss management. This subject is specifically important in distribution systems, which have been reported to have 70% of the total loss in power systems. In this thesis, distribution loss is studied and its affecting factors are analyzed. Then loss optimization and loss cost allocation to distribution consumers are studeid. In order to acheive these two goals, it is neccessary for the distribution system to have the capabilities of a smart grid. The subjectof distribution reconfiguration is duiscussed as one of the loss reduction methods. Traditional reconfiguration problem trend... 

    Optimization of Resonator’s Acoustic Performance in the Muffler Set

    , M.Sc. Thesis Sharif University of Technology Asadi, Alireza (Author) ; Khodaygan, Saeed (Supervisor)
    Abstract
    Noise pollution is one of the major issues in automative industry. Many of these noises are caused by the internal combustion engine. Using reactive mufflers in the car's exhaust path can effectively reduce this annoying noises. Imposed pressure drop caused by installation this mufflers must be within an acceptable range for the car engine. Resonators, despite having a much lower pressure drop than other components of the exhaust system, can be used to cover the weaknesses of the muffler in the acoustic performance of the noise reduction set. One of the most common methods for designing a resonator is to use perforated plates. In this study the effect of various geometric parameters of a... 

    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
    Abstract
    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... 

    Transmission loss allocation using normalized loss weight factors

    , Article 3rd International Conference on Deregulation and Restructuring and Power Technologies, DRPT 2008, Nanjing, 6 April 2008 through 9 April 2008 ; 2008 , Pages 431-435 ; 9787900714138 (ISBN) Keshmiri, S. N ; Ehsan, M ; Sharif University of Technology
    2008
    Abstract
    One of the major problems in liberalized power markets is loss allocation. In this paper, a new method for allocating transmission losses to pool market participants is proposed. The proposed method is fundamentally based on Bialek's "Tracing the flow of electricity" method. The losses is allocated to market participants using the loss weight factors (LWFs) which are obtained from the square current magnitude and Z-bus matrix. The LWF method is based on a solved load flow and strongly emphasizes on current magnitude while considers network topology. The method has been implemented and tested on several networks and one sample summarized in the paper. The results show that the method has an...