Search for: electricity-distribution-networks
0.007 seconds
Total 26 records

    Cleaner distribution of electricity energy considering Personnel's attitudes toward waste generation

    , Article Journal of Cleaner Production ; Volume 209 , 2019 , Pages 371-385 ; 09596526 (ISSN) Jamshidieini, B ; Rezaie, K ; Fotuhi Firuzabad, M ; Sharif University of Technology
    Elsevier Ltd  2019
    Electrification involves many activities that have detrimental impacts on environment. Over the last few years, many studies have been conducted to understand, estimate and mitigate the carbon footprint of electricity distribution but other environmental aspects of electrification remain almost neglected. In recent years, electricity distribution companies have adopted many waste management techniques to reduce the amount of waste generated in their key processes. However, the causes of waste and the necessary corrective actions to alleviate the waste generation in electricity distribution have not been studies in an integrated framework. In current study, which was conducted to fill this... 

    Evaluation of Different Multi-objective Approaches to Distribution Network Planning

    , M.Sc. Thesis Sharif University of Technology Jamshidi Eini, Bahman (Author) ; Hajji, Alireza (Supervisor)
    Power distribution network planning and related optimization is an interesting research subject and many papers have been published on this topic. Distribution network planning started in developed countries. Therefore network models are based on reliable network data, educated crew and low interest rate. Nowadays, Iranian engineers and researches try to use their research result for solving network optimization problems but sometimes the result of optimization is not achievable in reality. In current thesis, modeling approaches developed by previous researchers were compared and the effect of model simplification was evaluated. This evaluation was based on data gathered from local power... 

    A Comprehensive Scheme for Reliability-Centered Asset Management Implementation in Power Distribution Systems

    , M.Sc. Thesis Sharif University of Technology Dehghanian, Payman (Author) ; Fotuhi Firuzabad, Mahmoud (Supervisor)
    Toward the cost-effective solutions for the challenging features of maintenance in nowadays restructured power systems, reliability centered maintenance (RCM) has been introduced as the efficient key due to its streamlined performance. RCM, although has proven its noticeable merits in many industries, has not been yet furnished with efficient analytical methods in the power engineering context. In a power distribution system, vividly in a deregulated market and restructured environment, blind time based maintenance of all the distribution equipments is neither affordable nor economically justifiable. Moreover, an acceptable level of system reliability is an indispensable criterion for the... 

    A Comprehensive Method for Planning and Selection of Distribution Transformers Ratings and Their Asset Management

    , M.Sc. Thesis Sharif University of Technology Hajiaghapour Moghimi, Mehran (Author) ; Vakilian, Mehdi (Supervisor)
    A significant part of the power system energy losses occurs in the distribution transformers. The high loss share of these transformers in yearly electric energy losses of the country’s power network contributes to about 8% of the 20% total national electric energy losses. On the other hand due to the high rate of yearly increase in electric energy usage in the country, optimal distribution transformer planning and sizing pays an important role in reduction of these losses in the coming years. To address these concerns, the distribution companies should optimize the utilization of electric energy sources which results in an increase in their profits. This thesis introduces a new detailed... 

    The Effect of Reconfiguration on the Operation of Smart Distribution Systems with Distributed Generations

    , Ph.D. Dissertation Sharif University of Technology Dorostkar Ghamsari, Mohammad Reza (Author) ; Fotuhi-Firuzabad, Mahmud (Supervisor)
    In this dissertation, the value of distribution network reconfiguration in presence of distributed generation is investigated. In the first step, a mathematical optimization model is devised to minimize daily network losses via applying hourly reconfigurations. The results show that the hourly reconfiguration reduces the losses. Then, sensitivity analyses on the renewable penetration, wind and load correlation, switching cost and wind power prediction are conducted and discussed. The switching cost analysis revealed that a great amount of loss reduction could be attained with a small number of switching operations. The worthiness of reconfiguration becomes more in systems with high... 

    Optimal Placement of fault Indicator and Switch in Distribution Network Simultaneously

    , M.Sc. Thesis Sharif University of Technology Salehi, Saber (Author) ; Vakilian, Mehdi (Supervisor)
    The price that customers pay for electric energy is determined by cost of generation, transmission and distribution parts. In Practice all customer have main concern about reliability of electric energy, because of it’s major effect on different aspect of life. Although customers are interested to have fully reliable service, but power companies are aware that it is impossible to achieve this goal from technical and economical aspect. The utilities and customer benefits can be achieved through minimization of the total investment cost of network, while improving the reliability and quality of electric service. This also requires to minimize the customers service interruption time. To meet... 

    Design of Incentive Scheme for Reliability Improvement in Electricity Distribution Networks

    , Ph.D. Dissertation Sharif University of Technology Mohammadnezhad Shourkaei, Hossein (Author) ; Fotuhi Firuzabad, Mahmoud (Supervisor)
    The regulation is necessary for the electric distribution networks as a natural monopoly. Regulators have been applied the Performance Based Regulation (PBR) for the control of price. The common model of PBR is price cap. Price cap creates sufficient incentive for cost efficiency. However, it decreases the service quality in distribution systems. The aim of this thesis is to design a comprehensive model for improvement of service reliability in the presence of PBR. An incentive model is developed using reward-penalty theory and yardstick theory. Reward-penalty theory is a financial approach that rewards the utility with good reliability and penalizes the utility with poor reliability. The... 

    Developing a New Framework for Expansion Studies of Energy Storage Systems Considering Reconfiguration Capability of Network

    , M.Sc. Thesis Sharif University of Technology Mehrabi, Mohammad (Author) ; Abbaspour Tehranifard, Ali (Supervisor) ; Moeini, Moein (Supervisor)
    Proliferation of distributed energy resources and the developing of smart grid concepts are of a great importance. This, however, influences the future of power systems and necessitates more studies in order to cope with the changes. In this regard, uncontrollability issues are arised by introducing the renewable energy resources in the power systems. To address this issue, energy storage systems are used to mitigate negative consequences of using renewable energy resources. Accordingly, in this thesis, a new framework for determining the capacity and location of the energy storage systems is proposed. In addition, reconfiguration of distribution network is also concerned in order to... 

    Improving the Resiliency of Distribution Grids Owning Different Distributed Generation (DG) Resources by Optimal Switching Device Placement and Microgrids Formation

    , M.Sc. Thesis Sharif University of Technology Zare Bahramabadi, Majid (Author) ; Abbaspour Tehrani Fard, Ali (Supervisor)
    In recent years, climate change due to greenhouse gases caused an increase in frequency and intensity of the natural disasters such as hurricanes, blizzards and floods. Moreover, it is anticipated that such events will increase in the future. As a result, power system decision makers are looking for methods to improve power system resiliency against such natural disasters with low occurrence probability and high impact. In this report, the distribution system resiliency has improved via placing remote control sectionalizing switches and micro grids formation during natural disasters. In this regard, the concept of resiliency and its characteristics along with the effect of remote control... 

    Economic Analysis of Using Distributed Battery Storages in Microgrids

    , M.Sc. Thesis Sharif University of Technology Habibifar, Reza (Author) ; Ehsan, Mehdi (Supervisor)
    Nowadays, with the development of the generation and storage technologies of electrical energy, increasing attention to environmental issues, and interest in improving the reliability of electrical energy distribution networks, the motivation to develop the distribution networks from pssive to active mode. Although, the utilizing of electrical energy storage systems (EESs) made technical and economic analysis of power system more complicated, but some of these challenges have faciliated by microgrids. Indeed, microgrids, as low voltage and medium voltage networks, can provide a set of significant benefits at the level of distribution networks by improving energy efficiency, power quality,... 

    Developing an Efficient Framework for Bidding Strategy of a Technical Virtual Power Plant Considering Network Reliability

    , M.Sc. Thesis Sharif University of Technology Pourghaderi, Niloofar (Author) ; Fotuhi Firuzabad, Mahmud (Supervisor)
    Virtual power plant (VPP) aggregates the capacity of many diverse distributed energy resources (DERs); it creates a single operating profile from a composite of the parameters characterizing each DER and can incorporate the impact of the network on aggregated DER output. In modern power systems, technical virtual power plants (TVPPs) play an important role enabling presence of DERs in electricity markets. This thesis addresses the optimal bidding strategy problem of a TVPP that participates in the day-ahead (DA) electricity market. TVPP schedules its energy resources in a manner that maximize its profit in DA market. Hence, the optimal schedule of its resources is achieved. In a proposed... 

    Developing an Framework for Efficient Usage of Distributed Generation Expansion Plans in Distribution Network Considering the Effects of Reward-Penalty Mechanism

    , M.Sc. Thesis Sharif University of Technology Mirkhaef, Farzan (Author) ; Abbaspour Tehrani Fard, Ali (Supervisor)
    Based on codification and implementation of regulations of supporting from development of distributed generation sources, it is expected that in future years, investment in distributed generation scheme will be welcomed by private investors impressively. Under this circumstances, distribution Company will be faced with new chances for improving quality level of their services and optimal management of penalty-reward schemes. Penalty-reward schemes is set by legislator for distribution Company in order to improve their network. One of the pioneer ways is using distributed generators. So first, distribution Companies have to find optimum places for using these generators and in the second step... 

    Designing a Reward-Penalty Scheme to Improve Technical Performance of Distribution System Employing Distributed Generation (DG) Resources

    , M.Sc. Thesis Sharif University of Technology Jooshaki, Mohammad (Author) ; Abbaspour Tehranifard, Ali (Supervisor) ; Fotuhi Firuzabad, Mahmud (Supervisor)
    Reward-penalty schemes are known as the most effective tools to regulate the service quality. This thesis tries to design a comprehensive reward-penalty scheme to properly motivate electricity distribution companies (DisCos) to improve the reliability and reduce the energy losses in their networks using Distributed Generation (DG) Resources. So, as the first step, the designing methods of reward-penalty scheme (RPS) and their advantage and disadvantages are introduced, and also a method based on concept of the Yaredestic theory is proposed. The proposed method uses the Fuzzy clustering and is able to set the parameters of RPS in a fair and efficient way. The proposed RPS is implemented on... 

    Expansion Planning of Active Distribution Networks in the Gradual PV

    , M.Sc. Thesis Sharif University of Technology Khorshidi, Saman (Author) ; Ehsan, Mehdi (Supervisor)
    Due to the increasing influence of distribution generation , their effect in planning can't be ignord , especially solar panels ,which are incresing rapidly. The main purpose of this thesis is to an active distribution network that annually load bus and the amount of photovoltaic production in it increases and plan dynamically. In the planning that is done , uncertanty in the amount comsumption load and uncertanty in the pattern of sunlight and also annual innterest rates in the classical system we have planned by optimizing the network expansion costs , in addition to supplying the load bus, we can keep the voltage drop bus and line filling within the allowable . To do this , we considered... 

    Enhancement of Electric Energy Distribution System Performance in the Presence of Electric Vehicles as Mobile Energy Storage Devices

    , M.Sc. Thesis Sharif University of Technology Haji Abolhassani, Milad (Author) ; Safdarian, Amir (Supervisor)

    The worldwide increase in greenhouse gases is one of the most important human concerns today, and reducing emissions is on the agenda of politicians and the international community. Globally, the transportation fleet is one of the major sources of environmental pollutants due to the use of fossil fuels, and replacing this fleet with electric vehicles will play an important role in reducing the emission of environmental pollutants. These environmental concerns and the advancement of technologies used in electric vehicles in recent years have led to a relative increase in the presence of electric vehicles in the transportation network. The acceptance of these cars, on the one hand,... 

    Development of the Power Supply System's Resilience Model (Case Study: Khusestan Province Electrical Grid)

    , M.Sc. Thesis Sharif University of Technology Mombeni, Navid (Author) ; Saboohi, Yadollah (Supervisor)
    The purpose of the current study is developing an evaluation model for the electrical grid. Resilience is an approach toward risk management against disorders and protecting the system during critical conditions. The importance of resilience assessment, especially in crucial infrastructures, has always been at the center of attention. Nonetheless, previous studies in this field were mostly limited to micro-scales, meaning that only a limited part of the system was evaluated. Therefore, such studies rely on technical data and system details. This issue renders macro-scale assessments challenging. Some of the models, which are based on analytical-statistical methods, examine the systems at... 

    Improving Distribution System Resilience Using Microgrids

    , Ph.D. Dissertation Sharif University of Technology Bahrami, Mahdi (Author) ; Vakilian, Mehdi (Supervisor) ; Farzin, Hossein (Co-Supervisor) ; Lehtonen, Matti (Co-Supervisor)
    The number and severity of natural disasters have significantly increased in the recent years. Extreme weather-driven events cause catastrophic damages to power grid components. As a consequence, severe power outages occur in the affected grids. According to the published reports on natural disasters, 90 percent of such outages originate from distribution systems. In addition, the repair process of the damaged elements takes a long duration. Thus, it is necessary to improve the distribution system (DS) resilience against natural disasters. The strategies for resilience enhancement can be classified into two main groups: hardening and operation-oriented measures.Formation of microgrids has... 

    Evaluating the capability of distribution networks to maintain power quality and voltage level, case study: alborz electric power distribution company

    , Article IET Generation, Transmission and Distribution ; Volume 12, Issue 16 , 2018 , Pages 3883-3891 ; 17518687 (ISSN) Jamshidieini, B ; Rezaie, K ; Fotuhi Firuzabad, M ; Sharif University of Technology
    Distribution system operators that seek operational excellence are supposed to design and implement capable processes throughout their value stream and assess how well their real services match the design specifications. Process capability analysis is a critical stage in systematic and sophisticated quality engineering approaches such as six sigma, which are based on quantitative studies. The capability of a distribution network to maintain the power quality and voltage level within an acceptable range is one of the most important aspects of design and utilisation of electricity distribution network. Capability analysis has been successfully used in the previous studies to assess the quality... 

    An MILP Model for Optimal Placement of Sectionalizing Switches and Tie Lines in Distribution Networks with Complex Topologies

    , Article IEEE Transactions on Smart Grid ; Volume 12, Issue 6 , November , 2021 , Pages 4740-4751 ; 19493053 (ISSN) Jooshaki, M ; Karimi Arpanahi, S ; Lehtonen, M ; John Millar, R ; Fotuhi Firuzabad, M ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2021
    Sectionalizing switches (SSs) and tie lines play essential roles in reducing the duration of customer interruptions in electricity distribution networks. The effectiveness of such assets is strongly influenced by their placement in the grid. Operation of SSs and tie lines is also inherently interdependent. Due to the structural complexities regarding the mathematical modeling of such dependencies, optimization of the planning and operation of switches and tie lines has typically required either leveraging heuristic and metaheuristic approaches or oversimplifying the network topology. To tackle such issues, this paper presents a computationally-efficient model for reliability-oriented... 

    Developing a New Framework for Expansion Planning Studies of Active Distribution Networks Based on Optimal Management of Energy Resources

    , Ph.D. Dissertation Sharif University of Technology Kabirifar, Milad (Author) ; Fotuhi Firuzabad, Mahmud (Supervisor) ; Moeini-Aghtaie, Moein (Co-Supervisor)
    Expansion planning of distribution network assets is of importance to reliably supply the growing demand. Growing penetration of distributed energy resources (DERs) including renewable based distributed generators (DGs), conventional DGs, energy storage systems, and demand response (DR) resources in the network as well as their operational advantages make it necessary to address the investment planning of these resources in addition to the network assets. In order to effectively utilize the DERs and to solve the challenges arisen by their increasing penetration, active distribution networks (ADNs) are introduced which offer active network management capability. Passing through traditional...