Loading...
Search for:
power-system-reliability
0.007 seconds
Total 51 records
Adequacy assessment of small isolated power systems using a well-being approach
, Article 5th IFAC Symposium on Power Plants and Power Systems Control 2003, 15 September 2003 through 19 September 2003 ; Volume 36, Issue 20 , 2003 , Pages 691-695 ; 14746670 (ISSN) ; Rashidinejad, M ; Billinton, R ; Sharif University of Technology
IFAC Secretariat
2003
Abstract
In spite of the widespread applications of probabilistic criteria in large systems there is considerable reluctance to apply probabilistic techniques in small isolated power systems. This reluctance dictates a need to create a bridge between the conventional deterministic methods and the prevalent probabilistic techniques. This paper presents a well-being approach to illustrate the adequacy assessment of small isolated power systems. A well-being index designated as LORE and the conventional LOLE index are utilized to determine the maximum load carrying capability in two isolated systems. Copyright ©2003 IFAC
A new formulation for power system reliability assessment with AC constraints
, Article International Journal of Electrical Power and Energy Systems ; Vol. 56, issue , March , 2014 , p. 298-306 ; ISSN: 1420615 ; Fotuhi-Firuzabad, M ; Aminifar, F ; Lehtonen, M ; Sharif University of Technology
Abstract
Recent investigations have revealed the significant role of reactive power in blackout events. The associated disturbances frequently emerge in the form of voltage instability and collapse. Due to the computational complexity of modeling and analysis of enormous contingencies, DC approximation of the power flow, without accounting the role of reactive power, is usually used to evaluate the contingencies and to mitigate the associated probable violations. This paper, at first, presents a linear power flow model based on an approximated version of AC power flow formulation. The proposed model is then used to develop an efficient reliability assessment approach which is capable of taking both...
Role of outage management strategy in reliability performance of multi-microgrid distribution systems
, Article IEEE Transactions on Power Systems ; 2017 ; 08858950 (ISSN) ; Fotuhi Firuzabad, M ; Moeini Aghtaie, M ; Sharif University of Technology
Abstract
This paper develops a general framework for reliability assessment of multi-microgrid (MMG) distribution systems. It also investigates reliability impacts of coordinated outage man-agement strategies in a MMG distribution network. According to the proposed reliability evaluation framework, which is based on sequential Monte Carlo simulation method, distribution system is divided into smaller sections/microgrids based on protection sys-tem configuration and operating measures are efficiently simulat-ed considering different operation modes. In order to demonstrate the role of outage management strategy in reliability performance of MMG distribution systems, at first, the required features of...
Sectionalizing switch placement in distribution networks considering switch failure
, Article IEEE Transactions on Smart Grid ; Volume 10, Issue 1 , 2019 , Pages 1080-1082 ; 19493053 (ISSN) ; Fotuhi Firuzabad, M ; Safdarian, A ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2019
Abstract
Sectionalizing switches play a crucial role in enhancing service reliability to the end users of distribution networks. However, they might encounter failures, thereby causing interruptions in the networks. The existing switch placement models consider only the pros of switches in improving service reliability, while they fail to deem switches cons in possible failures and thus increasing system interruptions. This letter intends to show the importance of switch failure in the switch placement problem and the extent to which switch failure alters the switches allocation in a network. To do so, we develop a novel model based on mixed integer programming format to integrate the impacts of...
Sectionalizing switch placement in distribution networks considering switch failure
, Article IEEE Transactions on Smart Grid ; Volume 10, Issue 1 , 2019 , Pages 1080-1082 ; 19493053 (ISSN) ; Fotuhi Firuzabad, M ; Safdarian, A ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2019
Abstract
Sectionalizing switches play a crucial role in enhancing service reliability to the end users of distribution networks. However, they might encounter failures, thereby causing interruptions in the networks. The existing switch placement models consider only the pros of switches in improving service reliability, while they fail to deem switches cons in possible failures and thus increasing system interruptions. This letter intends to show the importance of switch failure in the switch placement problem and the extent to which switch failure alters the switches allocation in a network. To do so, we develop a novel model based on mixed integer programming format to integrate the impacts of...
Accurate fault location algorithm for series compensated transmission lines
, Article IEEE Transactions on Power Delivery, Piscataway, NJ, United States ; Volume 15, Issue 3 , 2000 , Pages 1027-1033 ; 08858977 (ISSN) ; Hadjsaid, N ; Ranjbar, A. M ; Feuillet, R ; Sharif University of Technology
IEEE
2000
Abstract
In this paper, an accurate fault location algorithm for series compensated power transmission lines is presented. Distributed time domain model is used for modeling of the transmission lines. The algorithm makes use of two subroutines for estimation of the fault distance - one for faults behind the series capacitors and another one for faults in front of the series capacitors. Then a special procedure to select the correct solution is utilized. Samples of voltages and currents at both ends of the line are taken synchronously and used to calculate the location of the fault. The proposed algorithm is independent of fault resistance and does not require any knowledge of source impedance. The...
Optimal transactive market operations with distribution system operators
, Article IEEE Transactions on Smart Grid ; 2017 ; 19493053 (ISSN) ; Ehsan, M ; Shahidehpour, M ; Sharif University of Technology
Abstract
Distribution system operator (DSO) has traditionally been responsible for the reliable operation of power distribution systems. The advent of distributed energy resources (DERs) and microgrids in distribution networks has required a new platform for DSOs. The new DSO, which is for the most part an independent agent, is responsible for aggregating a widely dispersed DERs (which include small thermal generation units, energy storage, and demand response) and flexible loads in electricity markets. DSO coordinates and balances the transactive dispatch of supply and demand at the distribution level and links wholesale and retail electricity markets. In this paper, a framework for the day-ahead...
Evaluation of UPFC impacts on power system reliability
, Article Transmission and Distribution Exposition Conference: 2008 IEEE PES Powering Toward the Future, PIMS 2008, Chicago, IL, 21 April 2008 through 24 April 2008 ; May , 2008 ; 9781424419036 (ISBN) ; Fotuhi Firuzabad, M ; Feuillet, R ; Sharif University of Technology
2008
Abstract
This paper evaluates the reliability impact of UPFC application in power system. The paper proposes a new reliability model for the UPFC which is capable of considering different operating states of UPFC. The model is then applied to a test system to study the reliability impacts of UPFC. The impacts of operating points of different states of the model on the system reliability are analyzed. The role of model parameters in reliability impacts of UPFC is analyzed through the sensitivity analysis. A comparative study is finally conducted to illustrate the applicability of the proposed model compare to that of existing UPFC reliability models. The abilities and deficiencies of the proposed...
Uncertainty consideration in power system reliability indices assessment using fuzzy logic method
, Article 2007 Large Engineering Systems Conference on Power Engineering, LESCOPE'07, Montreal, QC, 10 October 2007 through 12 October 2007 ; January , 2007 , Pages 305-309 ; 9781424415830 (ISBN) ; Ghafouri, A ; Sharif University of Technology
2007
Abstract
Reliability assessment of power systems is very vital particularly in the market-driven environment. As the power systems are nonlinear and large-scale systems, extracting their reliability indices involves much uncertainty. Calculation of power system reliability using stochastic methods is a complex and relatively difficult procedure. However, using fuzzy logic methods it would be possible to calculate the reliability in accordance with the existing uncertainties. In this paper, a new fuzzy logic based method is proposed to calculate the reliability indices of composite power systems. Then, the suggested method is examined on a sample network as a case study. © 2007 IEEE
Reliability Assessment of DSSC devices and Optimal Placement of them with the aim of Enhancing Power System Loadability and Reliability
, M.Sc. Thesis Sharif University of Technology ; Fotuhi-Firuzabad, Mahmoud (Supervisor)
Abstract
One of the important problems in fulfilling the consumers' power demand that has been especially intensified after restructuring is transmission line congestion. To solve this problem, either new transmission lines should be constructed or the existing transmission lines should be better utilized. Construction of new transmission lines is both expensive and time consuming. Therefore, it is usually better to enhance the utilization of the existing transmission assets. FACTS devices have been introduced over the past decades to enhance power systems operation. However, wide scale deployment of them has not occurred yet due to their high initial investment cost and some other problems. In order...
Reserve Management in Power Systems with Considering Dynamic Constraint
, M.Sc. Thesis Sharif University of Technology ; Ranjbar, Ali Mohammad (Supervisor)
Abstract
One of the important tasks of operation manager is keeping system in safe and reliable situation. There are many tools that supply safety in the power system. One of them is operation reserve. Operation reserve is any type of capacity being used to support active power balance. In this thesis, an approach for optimal determining reserve capacity with considering dynamic constraint is presented. This thesis describes a method for setting the optimum value of reserve capacity based on the cost of its provision, the benefit derived from its availability and Frequency stability. The method that used is D-SCRM algorithm. However, as the size of power systems increases, the current centralized...
Probabilistic ATC Assessment Incorporating UPEC
, Ph.D. Dissertation Sharif University of Technology ; Fotuhi-Firouzabad, Mahmud (Supervisor) ; Shahidehpour, Mohammad (Co-Advisor)
Abstract
Available Transmission Capability (ATC) is a measure of remaining capability in the transmission system for future use which is calculated and posted by Independent System Operator (ISO) considering various certain and uncertain power system parameters. ATC can be affected considerably by application of flexible AC transmission system (FACTS) controller among them Unified Power Flow Controller (UPFC) is the most recent one applied in power systems. This thesis is aimed to study the probabilistic ATC assessment incorporating UPFC. It first proposes a probabilistic ATC calculation method which is capable of considering various certain and uncertain parameters of ATC calculation in the...
Fault Management in Power Distribution Systems Manual & Remote Switchings Timing and Repair Crew Scheduling
,
M.Sc. Thesis
Sharif University of Technology
;
Safdarian, Amir
(Supervisor)
Abstract
Prompt service restoration following faults has always been a concern to power distribution utilities. In this regard, optimal human resource allocation in post-fault service restoration can speed up field remedial actions which count for significant portion of service interruption duration. This thesis develops a fault management navigator that dispatches crews for field actions in a sequential service restoration until the network is restored to the normal state. The developed navigator effectively coordinates manual and remote switching actions as well as repair actions in the hope of achieving minimum service interruption cost. It tackles a real-time problem, periodically updating the...
Evaluating Capacity Value of Wind Power Plants Considering Storage Systems
, M.Sc. Thesis Sharif University of Technology ; Fotuhi Firuzabad, Mahmud (Supervisor) ; Safdarian, Amir (Co-Supervisor)
Abstract
In recent decades, the trend towards renewable energy sources has increased dramatically. Rising fossil fuel prices and concerns about the effects of greenhouse gases and carbon dioxide emissions have drawn the attention of many energy experts to the use of renewable energy sources such as wind farms as an alternative to fossil fuel energy sources. Therefore, the issue of reliability related to these sources and whether such units can be considered as a source of generation has gained more importance. Due to the random nature of wind power, the share of these power plants in providing system adequacy is less than their nominal value. Therefore, determining the capacity value of wind power...
Operational reliability studies of power systems in presence of energy storage systems
, Article IEEE Transactions on Power Systems ; 2017 ; 08858950 (ISSN) ; Abbaspour, A ; Fotuhi Firuzabad, M ; Moeini Aghtaie, M ; Sharif University of Technology
Abstract
This paper mainly focuses on operational reliability studies of modern power systems taking into consideration the effects of energy storage systems (ESSs). The aim is to develop a new evaluation tool to assess the effects of different factors such as penetration rate, operational strategies and capacities of the ESSs in determining the role of these systems as an operating reserve resource. In this regard, at first, some modifications are made to the PJM method aimed to precisely model the short-term variability in output generation of wind farms in reliability studies. Then, this algorithm is employed to examine the effects of ESSs operating strategies in operational reliability level of...
Optimal transmission switching as a remedial action to enhance power system reliability
, Article 2016 Smart Grids Conference, SGC 2016, 20 December 2016 through 21 December 2016 ; 2017 , Pages 7-12 ; 9781509049882 (ISBN) ; Fotuhi Firuzabad, M ; Safdarian, A ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2017
Abstract
Increasing redundant paths in transmission grids has always been thought to be a tool to enhance service reliability. However, network equations by intertwining power flows through redundant paths impose more limits on systems with more redundancy. Accordingly, autonomous removing of a few lines may relief capacity limit violations in some contingency events thereby enhancing service reliability. This paper aims to study impacts of manual removing of transmission lines on composite system reliability. For doing so, the existing model is extended to consider optimal transmission switching (OTS) as a remedial action. The model minimizes total damage cost imposed by load curtailments. The...
Reliability assessment of protective relays in harmonic-polluted power systems
, Article IEEE Transactions on Power Delivery ; Volume 32, Issue 1 , 2017 , Pages 556-564 ; 08858977 (ISSN) ; Anders, G. J ; Fotuhi Firuzabad, M ; Farzin, H ; Aminifar, F ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2017
Abstract
Proliferation of distributed generations (DGs) and power-electronics-based loads is bringing about more harmonic-polluted power signals. While some failures may occur as a consequence of nonsinusoidal current or voltage waveforms, existing reliability models of protection relays have not taken the harmonic-related failures into consideration. This paper develops a comprehensive Markov reliability model to categorize the possible functional states of a component, say a transmission line, protected by a relay, operating in a harmonic-polluted environment. In order to make the proposed model practically tractable, it is further simplified in two ways, through merging the states of the same...
A linear model for dynamic generation expansion planning considering loss of load probability
, Article IEEE Transactions on Power Systems ; Volume 33, Issue 6 , 2018 , Pages 6924-6934 ; 08858950 (ISSN) ; Amraee, T ; Fotuhi Firuzabad, M ; Sharif University of Technology
Abstract
Computation of Loss of Load Probability (LOLP) is a challenge in Generation Expansion Planning (GEP) problem. This paper presents a dynamic GEP model considering LOLP as a reliability criterion. The objective function of the proposed dynamic GEP model includes the discounted total costs of investment cost, operation cost, and maintenance cost. The proposed LOLP constrained GEP problem is formulated as a mixed integer nonlinear programming (MINLP) problem. The MINLP formulation of GEP problem is then converted to a mixed integer linear programming (MIP) problem by applying several approximations to LOLP constraint. The utilized approximations are divided into two clusters for low and high...
Sectionalizing switch placement in distribution networks considering switch failure
, Article IEEE Transactions on Smart Grid ; 2018 ; 19493053 (ISSN) ; Fotuhi Firuzabad, M ; Safdarian, A ; Sharif University of Technology
Abstract
Sectionalizing switches play a crucial role in enhancing service reliability to the end users of distribution networks. However, they might encounter failures, thereby causing interruptions in the networks. The existing switch placement models consider only the pros of switches in improving service reliability, while they fail to deem switches cons in possible failures and thus increasing system interruptions. This study intends to show the importance of switch failure in the switch placement problem and the extent to which switch failure alters the switches allocation in a network. To do so, we develop a novel model based on mixed integer programming format to integrate the impacts of...
Operational reliability studies of power systems in the presence of energy storage systems
, Article IEEE Transactions on Power Systems ; Volume 33, Issue 4 , July , 2018 , Pages 3691-3700 ; 08858950 (ISSN) ; Abbaspour, A ; Fotuhi Firuzabad, M ; Moeini Aghtaie, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2018
Abstract
This paper mainly focuses on operational reliability studies of modern power systems taking into consideration the effects of energy storage systems (ESSs). The aim is to develop a new evaluation tool to assess the effects of different factors such as penetration rate, operational strategies, and capacities of the ESSs in determining the role of these systems as a source of operating reserve. In this regard, at first, some modifications are made to the Pennsylvania-New Jersey-Maryland (PJM) method aimed to precisely model the short-term variability in output generation of wind farms in reliability studies. Then, this algorithm is employed to examine the effects of ESSs operating strategies...