Search for: electric-power-transmission-networks
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    Dynamic uncertainty set characterization for bulk power grid flexibility assessment

    , Article IEEE Systems Journal ; Volume 14, Issue 1 , 2020 , Pages 718-728 Pourahmadi, F ; Heidarabadi, H ; Hosseini, S. H ; Dehghanian, P ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2020
    The increasing variability of renewables and volatile chronological net-load in power grids engenders significant risks of an uncertain sufficiency of flexible capacity. Although considerable advances in power grid flexibility assessment have been made, modeling the effect of temporal correlations associated with wind generations on the system flexibility provision capability has remained a challenge. This paper proposes a novel UC-time-scale security-constrained affinely robust formulation for wind-originated uncertainty sets in order to evaluate the system flexibility capacity over time. An efficient model based on duality theorem and affine policy is proposed to assess a secure region in... 

    A system wide scheme for mitigation of voltage instability

    , Article 2009 IEEE/PES Power Systems Conference and Exposition, PSCE 2009, Seattle, WA, 15 March 2009 through 18 March 2009 ; 2009 ; 9781424438112 (ISBN) Amraee, T ; Feuillet, R ; Ranjbar, A. M ; Mozafari, B ; Sharif University of Technology
    In this paper, a system wide scheme is proposed to arrest voltage instability. This scheme consists of two stabilizing and securing parts. For post- contingency situations, where there are no equilibrium solutions, first, the stabilizing scheme finds the closest solvable operating point, and then passes this point to the securing scheme. The securing scheme brings the solvable, but insecure operating point, back to a secure and stable one. Also, a voltage stability indicator is proposed to monitor the available margin to the collapse point. The proposed stabilizing and securing model are solved using the sequential quadratic programming technique. ©2009 IEEE  

    Optimal ATC allocation in power systems

    , Article 2008 Joint International Conference on Power System Technology POWERCON and IEEE Power India Conference, POWERCON 2008, New Delhi, 12 October 2008 through 15 October 2008 ; January , 2008 ; 9781424417629 (ISBN) Rajabi Ghahnavieh, A ; Fotuhi Firuzabad, M ; Feuillet, R ; Sharif University of Technology
    When there are transmission service requests for a specific sink/source pair in a transmission system, the ISO must allocate the ATC of that pair to the requests. Since the requests could have different types, tariffs and time frame, the allocation must be accomplished in a sound and fair manner that considers various aspects of the requests. This paper proposes an approach to allocate the ATC to transmission service requests in both operating and planning horizons. The proposed method considers types and tariffs of requests in a nonlinear optimization which maximizes the expected net revenue of ATC allocation. The solution to the optimization problem gives the amount of accepted requests.... 

    The impact of smart grid technology on dielectrics and electrical insulation

    , Article IEEE Transactions on Dielectrics and Electrical Insulation ; Volume 22, Issue 6 , 2015 , Pages 3505-3512 ; 10709878 (ISSN) Catterson, V. M ; Castellon, J ; Pilgrim, J. A ; Saha, T. K ; Ma, H ; Vakilian, M ; Moradnouri, A ; Gholami, M ; Sparling, B. D ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2015
    Delivery of the Smart Grid is a topic of considerable interest within the power industry in general, and the IEEE specifically. This paper presents the smart grid landscape as seen by the IEEE Dielectrics and Electrical Insulation Society (DEIS) Technical Committee on Smart Grids. We define the various facets of smart grid technology, and present an examination of the impacts on dielectrics within power assets. Based on the trajectory of current research in the field, we identify the implications for asset owners and operators at both the device level and the systems level. The paper concludes by identifying areas of dielectrics and insulation research required to fully realize the smart... 

    An efficient secure scheme for lossy and lossless data aggregation in smart grid

    , Article 9th International Symposium on Telecommunication, IST 2018, 17 December 2018 through 19 December 2018 ; 2019 , Pages 528-534 ; 9781538682746 (ISBN) Sarenche, R ; Forghani, P ; Ameri, M. H ; Aref, M. R ; Salmasizadeh, M ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2019
    In this paper, we propose an efficient secure data aggregation scheme for the smart grid, which supports both lossy and lossless data aggregation. In order to reduce the computational overhead of the control center, our proposed model includes a number of entities, called gateways, which act as intermediaries between the users and the control center. At the end of each measurement interval, each user generates a report which is encrypted using the Paillier cryptosystem and contains the user's consumption amount during the previous measurement interval as well as his or her prediction of consumption during another interval in the future. After receiving the user's reports, gateways perform... 

    Decentralised hybrid robust/stochastic expansion planning in coordinated transmission and active distribution networks for hosting large-scale wind energy

    , Article IET Generation, Transmission and Distribution ; Volume 14, Issue 5 , 2020 , Pages 797-807 Nikoobakht, A ; Aghaei, J ; Massrur, H. R ; Hemmati, R ; Sharif University of Technology
    Institution of Engineering and Technology  2020
    Today, coordinated expansion planning is one of the key challenges for electricity systems including active distribution networks (ADNs) and transmission networks (TNs) hosting distributed renewable generation as well as large-scale wind energy generation. Accordingly, this study presents a decentralised hybrid robust and stochastic (HR&S) expansion planning optimisation method to determine a robust generation and transmission planning for a TN and stochastic expansion planning for ADNs. The proposed HR&S planning model is formulated with the objective of achieving an effective expansion of both TN&ADN while minimises the investment and operation costs of TN&ADN planning considering wind... 

    Investigating the effect of ambient temperature on fault-induced delayed voltage recovery events

    , Article IET Generation, Transmission and Distribution ; Volume 14, Issue 9 , 2020 , Pages 1781-1790 Saber, H ; Karimi, M. R ; Hajipour, E ; Farzin, N ; Hashemi, S. M ; Agheli, A ; Ayoubzadeh, H ; Ehsan, M ; Sharif University of Technology
    Institution of Engineering and Technology  2020
    The high penetration of residential air conditioners (RACs) poses a growing concern in emerging fault-induceddelayed voltage recovery (FIDVR) in power systems. FIDVR is expected to be a significant threat to the stability and reliability offuture power grids. Hence, the system planners should carry out appropriate simulation studies to mitigate the severeconsequences of FIDVR events. A key question to implement these studies is how to determine the worst condition whichresults in FIDVR. Most of the actual FIDVR events have been experienced in the hot hours of the day and this issue makes onecurious to think about the relationship between the FIDVR events and the ambient temperature. In this... 

    ATC enhancement using TCSC via artificial intelligent techniques

    , Article Electric Power Systems Research ; Volume 78, Issue 1 , 2008 , Pages 11-20 ; 03787796 (ISSN) Rashidinejad, M ; Farahmand, H ; Fotuhi Firuzabad, M ; Gharaveisi, A. A ; Sharif University of Technology
    Procurement of optimum available transfer capability (ATC) in the restructured electricity industry is a crucial challenge with regards to open access to transmission network. This paper presents an approach to determine the optimum location and optimum capacity of TCSC in order to improve ATC as well as voltage profile. Real genetic algorithm (RGA) associated with analytical hierarchy process (AHP) and fuzzy sets are implemented as a hybrid heuristic technique in this paper to optimize such a complicated problem. The effectiveness of the proposed methodology is examined through different case studies. © 2007 Elsevier B.V. All rights reserved  

    Reliability assessment of an automated distribution system

    , Article IET Generation, Transmission and Distribution ; Volume 1, Issue 2 , 2007 , Pages 223-233 ; 17518687 (ISSN) Kazemi, S ; Fotuhi Firuzabad, M ; Billinton, R ; Sharif University of Technology
    Automation can greatly enhance distribution-network reliability by speeding up service restoration and thus significantly reduce customer-outage time. The paper presents an approach to assess quantitatively the adequacy of a particular automated distribution scheme designated as the 'low interruption system' (LIS). Owing to the use of a high-speed communication system and line sensors, this automated scheme can reduce drastically the number of interruptions, the service interruption time and also the area affected by the fault. This scheme provides a simple and cost-effective way to automate distribution systems in which the remotely controlled switches speed up isolation of faulted sections... 

    Modeling and quantification of power system resilience to natural hazards: a case of landslide

    , Article IEEE Access ; Volume 9 , 2021 , Pages 80300-80309 ; 21693536 (ISSN) Ghorani, R ; Fattaheian-Dehkordi, S ; Farrokhi, M ; Fotuhi Firuzabad, M ; Lehtonen, M ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2021
    Power systems are stretched across thousands of miles of diverse territories, often in remote locations, to generate and transfer the energy to geographically dispersed customers. The system is therefore subjected to a wide range of natural hazards which could potentially damage critical system components and cause interruption of electricity supply in some areas. To improve system resilience against natural hazards, management frameworks are required to identify hazardous areas and prioritize reinforcement activities in order to take the most out of the limited resources.Landslide is a natural disaster that involves the breakup and downhill flow of rock, mud, water, and anything caught in... 

    A novel matrix based systematic approach for vulnerability assessment

    , Article COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering ; Volume 40, Issue 1 , 2021 , Pages 1-17 ; 03321649 (ISSN) Sabouhi, H ; Doroudi, A ; Fotuhi Firuzabad, M ; Bashiri, M ; Sharif University of Technology
    Emerald Group Holdings Ltd  2021
    Purpose: This paper aims to propose a novel matrix-based systematic approach for vulnerability assessment. Design/methodology/approach: The proposed method consists of two major steps. First, the power network is modeled as a topological combination of edges (transmission lines, transformers, etc.) and nodes (buses, substations, etc.). The second step is to use an axiomatic design-based index for topology analysis. This index is based on the systematic counting of possible routes from the start (generators) to destination (loads), considering load importance, before and after a disruption. Findings: The effectiveness of the proposed method is demonstrated through an illustrative example and... 

    Resiliency enhancement against wildfires

    , Article 2021 IEEE Power and Energy Society Innovative Smart Grid Technologies Conference, ISGT 2021, 16 February 2021 through 18 February 2021 ; 2021 ; 9781728188973 (ISBN) Hojjatinejad, S ; Ghassemi, M ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2021
    The power system is the foundation for a modern society, and its safe and efficient operation is the prerequisite for our social and economic life. Manmade attacks and natural disasters such as hurricanes, tornadoes, floods, volcanic eruptions, and wildfires can cause temporary or permanent damages to the electric power system infrastructure. Wildfires are among the natural disasters rapidly growing in the last years. This has aroused growing attention toward the resiliency enhancement of power systems against wildfires. This paper reviews the activities developed to improve the resiliency of power systems, focusing on wildfires. In this regard, hardening and pre-event preparation,... 

    Topology and vulnerability of the Iranian power grid

    , Article Physica A: Statistical Mechanics and its Applications ; Vol. 406, issue , July , 2014 , p. 24-33 ; ISSN: 03784371 Saniee Monfared, M. A ; Jalili, M ; Alipour, Z ; Sharif University of Technology
    In this paper we investigated the structural properties of the ultra high voltage power transmission network of Iran. We modeled the power grid as a network with 105 nodes and 142 connection links. We found that the Iranian power grid displays a relatively moderate clustering coefficient-much larger than that of corresponding random networks-and small characteristics path length comparable to that of corresponding random networks; i.e. the power grid is a small-world network with exponential degree distribution. Global efficiency was considered as an indicator of grid's performance and the influence of random and intentional nodal failures on the efficiency was investigated. We also studied... 

    The impact of wind farms with doubly fed induction generators on power system electromechanical oscillations

    , Article Renewable Energy ; Volume 50 , 2013 , Pages 780-785 ; 09601481 (ISSN) Jafarian, M ; Ranjbar, A. M ; Sharif University of Technology
    Introduction of large amounts of new wind generation can affect the small signal stability of power systems with three mechanisms: displacing synchronous generators (SGs); reducing SGs power generation; and the dynamics of wind farms (WFs) interacting with the electromechanical mode of SGs. In this paper a novel approach is developed to investigate the impact of the latter mechanism on existing power systems oscillations. In this approach, the dynamic behavior of grid connected WFs is studied independent of the dynamic behavior of system SGs. This approach helps to identify the conditions in which the dynamics of WFs may interact with the electromechanical mode of SGs. Also it helps to... 

    Smart power management of DC microgrids in future milligrids

    , Article 2016 18th European Conference on Power Electronics and Applications, EPE 2016 ECCE Europe, 5 September 2016 through 9 September 2016 ; 2016 ; 9789075815245 (ISBN) Peyghami Akhuleh, S ; Mokhtari, H ; Davari, P ; Loh, P. C ; Blaabjerg, F ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2016
    In this paper a novel droop approach for power management in low voltage dc MicroGrids (MGs) based on a master-slave concept is presented. A virtual frequency is injected by a master unit, which is proportional to its output power. Other slave units determine their output power according to the corresponding frequency based droop characteristics. Unlike the dc voltage-droop methods, the proposed virtual frequency-droop approach can be smartly applied for proportional power management among the energy units and loads as well as adding zero net energy capability to the MG. Both power flow and energy flow can be performed without utilizing an extra communication system. Simulation results... 

    Optimal DR through HVAC loads in distribution systems hosting large wind generation

    , Article IEEE Innovative Smart Grid Technologies, 3 November 2015 through 6 November 2015 ; 2015 ; 9781509012381 (ISBN) Ali, M ; Humayun, M ; Degefa, M ; Lehtonen, M ; Safdarain, A ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc 
    The penetration of wind generation in distribution networks is steadily increasing and may provide ample business opportunities for aggregators. While, residential demand response (DR) has proven to be a feasible economic tool in smart grids, the quantitative evaluation of various aggregator-based DR services is required to tap the maximum benefits from the DR flexibility. This paper provides an overview of benefits of different DR aggregator services such as minimization of energy cost and wind curtailment given the scenario of large wind generation hosted by distribution network. An optimization model is formulated from aggregator perspective to manage the population of heating,... 

    A framework for activating residential HVAC demand response for wind generation balancing

    , Article IEEE Innovative Smart Grid Technologies, 3 November 2015 through 6 November 2015 ; 2015 ; 9781509012381 (ISBN) Ali, M ; Humayun, M ; Degefa, M ; Alahaivala, A ; Lehtonen, M ; Safdarian, A ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc 
    The integration of a great deal of intermittent renewable generation in future grids will require more operational flexibility. Residential demand response can provide the load shaping potentials thereby alleviating the need for operational flexibility. This paper intends to develop a centralized framework focusing on realization of domestic heating, ventilation, and air conditioning (HVAC) demand response capability for wind power balancing. In the proposed optimization model, energy consumption of HVAC loads is optimized to tackle the variability of wind power. The thermal comfort penalty is explicitly integrated in the objective function in order to oblige different customers' thermal... 

    A user-centric demand response framework for residential heating, ventilation, and air-conditioning load management

    , Article Electric Power Components and Systems ; Volume 44, Issue 1 , 2016 , Pages 99-109 ; 15325008 (ISSN) Ali, M ; Jokisalo, J ; Siren, K ; Safdarian, A ; Lehtonen, M ; Sharif University of Technology
    Taylor and Francis Inc  2016
    The domestic heating, ventilation, and air-conditioning load promises a good prospect for electrical aggregators to consider it for demand response. This article presents a user-centric demand response control for scheduling the electric space heating load under a price and load uncertainty environment. The objective of the framework is to minimize a weighted sum of the expected payment, loss of comfort, and financial risk of a customer while strictly considering the end-user preferences. The household thermal behavior is modeled via an accurate two-capacity building model. The price and load uncertainty is modeled using a scenario-based stochastic programming approach. The proposed decision... 

    Short term fluctuations of wind and solar power systems

    , Article New Journal of Physics ; Volume 18, Issue 6 , 2016 ; 13672630 (ISSN) Anvari, M ; Lohmann, G ; Wächter, M ; Milan, P ; Lorenz, E ; Heinemann, D ; Rahimi Tabar, M. R ; Peinke, J ; Sharif University of Technology
    Institute of Physics Publishing 
    Wind and solar power are known to be highly influenced by weather events and may ramp up or down abruptly. Such events in the power production influence not only the availability of energy, but also the stability of the entire power grid. By analysing significant amounts of data from several regions around the world with resolutions of seconds to minutes, we provide strong evidence that renewable wind and solar sources exhibit multiple types of variability and nonlinearity in the time scale of seconds and characterise their stochastic properties. In contrast to previous findings, we show that only the jumpy characteristic of renewable sources decreases when increasing the spatial size over... 

    Value of distribution network reconfiguration in presence of renewable energy resources

    , Article IEEE Transactions on Power Systems ; Volume 31, Issue 3 , 2016 , Pages 1879-1888 ; 08858950 (ISSN) Dorostkar Ghamsari, M. R ; Fotuhi Firuzabad, M ; Lehtonen, M ; Safdarian, A ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc 
    Proliferation of renewable energy resources in distribution networks has captured distribution companies' attention towards more active management tools. Thanks to the smart grid paradigm, hourly network reconfiguration, which is still among immature ideas, can bring the activeness required to handle fluctuating output of renewable resources. The aim of this study is to analyze the worthiness of the hourly reconfiguration in the presence of renewable energy resources. For doing so, a mathematical model is devised to minimize daily network losses via applying hourly reconfigurations. The model is a mixed integer second-order cone programming problem and is solved via MOSEK solver. The...