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reliability-evaluation
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A non-intrusive portable fault injection framework to assess reliability of FPGA-based designs
, Article FPT 2013 - Proceedings of the 2013 International Conference on Field Programmable Technology ; 2013 , Pages 398-401 ; 9781479921990 (ISBN) ; Ghaderi, Z ; Miremadi, S. G ; Sharif University of Technology
2013
Abstract
This paper proposes a full-featured fault injection framework to assess reliability of FPGA-based designs. The framework provides non-intrusiveness, portability, flexibility and performance in reliability evaluation of FPGA-based designs against adverse effects of SEUs. It works in a non-intrusive manner, allowing the reliability of ready-to-be-released designs to be assessed independently, without any intrusion into their place and route characteristics. We have studied implications of framework's intrusiveness into design under test by comparing proposed non-intrusive framework with previous intrusive methods; up to 5% deviation in the number of effective faults is observed in intrusive...
Reliability evaluation in power distribution system planning studies
, Article 2016 International Conference on Probabilistic Methods Applied to Power Systems, PMAPS 2016 - Proceedings, 16 October 2016 through 20 October 2016 ; 2016 ; 9781509019700 (ISBN) ; Fotuhi Firuzabad, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2016
Abstract
In distribution system planning studies, reliability evaluation is performed during optimization procedure to calculate the interruption cost, DISCO's income and to check the viability of constraints related to reliability indices. In each iteration of the optimization algorithm a special plan is evaluated that is different from other plans. So the configuration and specification of the network which is one of the input information for reliability evaluation is changing continuously that makes difficulties for this evaluation. To solve these difficulties, this paper presents a systematic method for reliability evaluation in distribution planning studies. The proposed approach can be...
Mathematical methods of combining deterministic/probabilistic criteria in short-term generating reserve scheduling
, Article Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering ; Volume 218, Issue 2 , 2004 , Pages 69-75 ; 09544089 (ISSN) ; Fotuhi Firuzabad, M ; Sharif University of Technology
Professional Engineering Publishing
2004
Abstract
Probabilistic approaches generally base the design and operating constraints on the criterion that the risk of certain events must not exceed preselected limits. Many utilities still prefer to use deterministic techniques owing to the difficulty in interpreting a numerical risk index and the lack of sufficient information provided by a single index. This is especially true in the power system operating domain as existing probabilistic risk indices do not provide any assessment of the capacity reserve available during the course of system operation. A practical way to overcome these difficulties is to embed deterministic considerations into the probabilistic framework in the form of system...
Reliability evaluation of a composite power system containing wind and solar generation
, Article Proceedings of the 2013 IEEE 7th International Power Engineering and Optimization Conference, PEOCO 2013 ; 2013 , p. 483-488 ; ISBN: 9781470000000 ; Abbaspour, A ; Fotuhi-Firuzabad, M ; Moeini-Aghtaie, M ; Othman, M ; Sharif University of Technology
Abstract
Variability and uncertainty of wind and photovoltaic (PV) generations greatly influence technical and financial aspects of power systems. This paper examines the potential impacts of large-scale wind and PV farms on reliability level of composite generation and transmission systems. At first, reliability models of renewable-based units are developed. In these models, both component failure rates and uncertainty nature of renewable resources are taken into account. Using the proposed technique, the multi-state analytical models of a wind farm placed in Manjil and a PV farm placed in Jask both in Iran are extracted. Then, reliability studies of high renewable-energies penetrated power system...
Reliability evaluation of a composite power system containing wind and solar generation
, Article Proceedings of the 2013 IEEE 7th International Power Engineering and Optimization Conference, PEOCO 2013 2013, Article , Pages 483-488 ; number 6564597 , 2013 , Pages 483-488 ; 9781467350730 (ISBN) ; Abbaspour, A ; Fotuhi Firuzabad, M ; Moeini Aghtaie, M ; Othman, M ; Sharif University of Technology
2013
Abstract
Variability and uncertainty of wind and photovoltaic (PV) generations greatly influence technical and financial aspects of power systems. This paper examines the potential impacts of large-scale wind and PV farms on reliability level of composite generation and transmission systems. At first, reliability models of renewable-based units are developed. In these models, both component failure rates and uncertainty nature of renewable resources are taken into account. Using the proposed technique, the multi-state analytical models of a wind farm placed in Manjil and a PV farm placed in Jask both in Iran are extracted. Then, reliability studies of high renewable-energies penetrated power system...
Prioritizing demand response programs from reliability aspect
, Article 2012 11th International Conference on Environment and Electrical Engineering, EEEIC 2012 - Conference Proceedings ; 2012 , Pages 229-234 ; 9781457718281 (ISBN) ; Bashirvand, M ; Mozafari, B ; Ranjbar, A. M ; Sharif University of Technology
IEEE
2012
Abstract
In this paper, the impact of demand response programs (DRPs) on reliability improvement of the restructured power systems is quantified. In this regard, the demand response (DR) model which treats consistently the main characteristics of the demand curve is developed for modeling. In proposed model, some penalties for customers in case of no responding to load reduction and incentives for customers who respond to reducing their loads are considered. In order to make analytical evaluation of the reliability, a mixed integer DCOPF is proposed by which load curtailments and generation re-dispatches for each contingency state are determined. Both transmission and generation failures are...
Reliability study of HV substations equipped with the fault current limiter
, Article IEEE Transactions on Power Delivery ; Volume 27, Issue 2 , 2012 , Pages 610-617 ; 08858977 (ISSN) ; Aminifar, F ; Rahmati, I ; Sharif University of Technology
2012
Abstract
Of particular interest to restrict the short-circuit level of interconnected power systems is to exploit fault current limiter (FCL) technologies. FCLs let the system planners devise new reliable and rather economical substation configurations and provide the possibility of proposing a promising cost-effective and prompt solution to the fault current over duty problem in the existing substations. This paper attempts to assess reliability of substation architectures accommodating the FCL operation and, besides, numerically investigates the FCL's impacts on the substation reliability indices. In order to clarify the proposed approach, two case studies with and without FCL are analyzed and...
Reliability Evaluation of Smart Distribution Grids
, Ph.D. Dissertation Sharif University of Technology ; Fotuhi Firouzabad, Mahmoud (Supervisor) ; Lehtonen, Matti (Supervisor)
Abstract
The term “Smart Grid” generally refers to a power grid equipped with the advanced technologies dedicated for purposes such as reliability improvement, ease of control and management, integrating of distributed energy resources and electricity market operations. Improving the reliability of electric power delivered to the end users is one of the main targets of employing smart grid technologies. The smart grid investments targeted for reliability improvement can be directed toward the generation, transmission or distribution system level. However, radial operating status, aging infrastructures, poor design and operation practices and high exposure to environmental conditions have caused the...
Hybrid AC/DC microgrids flexible reliability index by using the axiomatic design concept
, Article IET Generation, Transmission and Distribution ; Volume 14, Issue 23 , 2020 , Pages 5456-5462 ; Doroudi, A ; Fotuhi Firuzabad, M ; Bashiri, M ; Sharif University of Technology
Institution of Engineering and Technology
2020
Abstract
With the capacity increase of large-scale DC renewable energy and DC loads, the reliability issues of hybrid AC/DC networks become increasingly prominent. On the other hand, a modern distribution network should also deliver power to individual customers based on their priority levels and the traditional reliability indices are not suitable for modern networks. Flexible reliability (FR) is a new concept that considers the loads' importance in the reliability evaluation of distribution grids. In this study, a novel comprehensive FR index is introduced for hybrid AC/DC networks. To determine the proposed index, power networks are modelled as a topological combination of edges and nodes. An...
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) ; Fotuhi Firuzabad, M ; Feuillet, R ; Sharif University of Technology
2008
Abstract
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....
Codification of Reliability Evaluation Software in UAVs Industry
, M.Sc. Thesis Sharif University of Technology ; Banazadeh, Afshin (Supervisor)
Abstract
In every modern society, the engineers and technical managers are in charge of planning, designing, manufacturing and utilizing the simplest products to the most complex systems. This shows the importance of reliability management in engineering systems. Inattention to the reliability of such systems leads to the difficulty or even impossibility in planning or utilizing them. Malfunction of products and systems results in disruption in different levels and can be regarded as a severe threat to society and environment.
Therefore, consumers and general public expect products and systems to be durable, reliable and safe. Thus, the main question is how safe and how reliable the system will...
Therefore, consumers and general public expect products and systems to be durable, reliable and safe. Thus, the main question is how safe and how reliable the system will...
Reliability evaluation of non-reparable three-state systems using Markov model and its comparison with the UGF and the recursive methods
, Article Reliability Engineering and System Safety ; Vol. 129 , September , 2014 , pp. 29-35 ; ISSN: 0951-8320 ; Sharifi, M ; Niaki, S. T. A ; Zaretalab, A ; Sharif University of Technology
Abstract
In multi-state systems (MSS) reliability problems, it is assumed that the components of each subsystem have different performance rates with certain probabilities. This leads into extensive computational efforts involved in using the commonly employed universal generation function (UGF) and the recursive algorithm to obtain reliability of systems consisting of a large number of components. This research deals with evaluating non-repairable three-state systems reliability and proposes a novel method based on a Markov process for which an appropriate state definition is provided. It is shown that solving the derived differential equations significantly reduces the computational time compared...
Review of reduction techniques in the determination of composite system adequacy equivalents
, Article Electric Power Systems Research ; Volume 80, Issue 12 , 2010 , Pages 1385-1393 ; 03787796 (ISSN) ; Fotuhi Firuzabad, M ; Billinton, R ; Farokhzad, D ; Sharif University of Technology
2010
Abstract
Reliability evaluation of a large composite power system involves the consideration of numerous outage events and consequently extensive calculations. Therefore, applying justifiable simplifications such as the determination of an equivalent networks can be very useful in reliability evaluation of large systems. This paper presents a review of procedures which are directly or indirectly applicable to the determination of composite system adequacy equivalents. Following a brief discussion on the basic characteristics of the various methods, their limitations are presented. Concluding points regarding the methods and modeling schemes related to adequacy equivalent are presented at the end of...
Impacts of remote control switch malfunction on distribution system reliability
, Article IEEE Transactions on Power Systems ; Volume 32, Issue 2 , 2017 , Pages 1572-1573 ; 08858950 (ISSN) ; Farajollahi, M ; Fotuhi Firuzabad, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2017
Abstract
Remote control switches (RCSs) are often assumed to be fully reliable in reliability and cost/worth analyses. This assumption, however, overestimates their merits, thereby misguiding network owners about their optimal implementation. This letter extends the current reliability evaluation procedure to incorporate probability of RCS malfunctions. Then, the extended procedure is applied to a network equipped with a few RCSs. The numerical studies reveal that RCS malfunctions degrade their worth, which may even affect their optimal number and locations. © 1969-2012 IEEE
Optimal allocation of available transfer capability in operating horizon
, Article IEEE Transactions on Power Systems ; Volume 24, Issue 2 , 2009 , Pages 967-975 ; 08858950 (ISSN) ; Fotuhi Firuzabad, M ; Shahidehpour, M ; Feuillet, R ; Sharif University of Technology
2009
Abstract
When there are transmission service requests for a specific sink/source pair in a transmission system, the ISO must allocate the available transfer capacity (ATC) of that pair to the requests. Since the requests could have different types, tariffs and time frames, the allocation must be accomplished in a sound and fair manner that incorporates various aspects of the requests. This paper proposes a comprehensive approach to allocation of ATC to transmission service requests. The proposed method considers types, tariffs, and priority of requests in a mixed-integer nonlinear optimization which incorporates the allocation rules. The solution to the optimization problem gives the amount of...
An MP-based approximation algorithm on reliability evaluation of multistate flow networks
, Article Reliability Engineering and System Safety ; Volume 191 , 2019 ; 09518320 (ISSN) ; Kagan, N ; Mahdavi Amiri, N ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
In recent decades, multistate two-terminal reliability problem has attracted several researchers, and accordingly many exact and approximation approaches have been proposed in the literature in terms of minimal cuts (MCs) or minimal paths (MPs) to address this problem. Here, an MP-based approximation approach is developed based on exact algorithms. With all the MPs at hand, the approach rearranges the MPs ascendingly with respect to their lengths and then sets the flow on some MPs to be zero which turns to reduce the computing cost in solving the problem. We provide the complexity results, and by employing some benchmarks and one thousand randomly generated networks illustrate that not only...
Reliability evaluation of a small area in a composite power system using branch-cutting method and load uncertainty
, Article Canadian Conference on Electrical and Computer Engineering 2005, Saskatoon, SK, 1 May 2005 through 4 May 2005 ; Volume 2005 , 2005 , Pages 2220-2223 ; 08407789 (ISSN) ; Haghifam, M. R ; Fotuhi Firuzabad, M ; Farrokhzad, D ; Sharif University of Technology
2005
Abstract
In many applications, the requirements of static data and large computation times are still major concerns. This paper presents a practical equivalent model of a small area in a large scale system which needs less statistical data of system equipments with acceptable level of accuracy. The proposed technique is designated as the Branch-Cutting Method in which tie lines between the area of interest (AI) and the other parts of the network are cut and the network behavior is modeled with some load and generating units in marginal load points. The load at marginal load points is represented as a multi state load model with the associated state probability. Load uncertainty is modeled using the...
Probabilistic Placement of Phasor Measurement Units (PMUs) for Power Network Observability
, Ph.D. Dissertation Sharif University of Technology ; Fotuhi Firuzabad, Mahmoud (Supervisor) ; Shahidehpour, Mohammad (Co-Advisor)
Abstract
Wide-area measurement system (WAMS), which is enabled by broad installation of phasor measurement units (PMUs), is a novel solution for the secure and reliable operation of modern power systems. The adequate number and appropriate location of PMUs has been introduced as a challenging research area in recent years. This dissertation is the first effort to assess the cost/worth analysis of WAMS design and PMU locationing in a probabilistic manner. In the studies conducted here, power network monitoring and control associated with the energy management system (EMS), among miscellaneous applications of WAMS, have been taken into consideration. First, the conventional deterministic definition of...
Evaluation of Fault Tolerance for SRAM-Based FPGAs by Fault Injection into Configuration Bits
, M.Sc. Thesis Sharif University of Technology ; Miremadi, Ghasem (Supervisor)
Abstract
Reconfiguration, short development time and low cost have made Field Programmable Gate Arrays (FPGAs) an appealing option for digital circuit designers. Meanwhile, the occurrence of Single Event Upset (SEU) in configuration memory of SRAM-based FPGAs can change the implemented design inside the FPGA chip. Assessing reliability of FPGA-based designs against pernicious effects of SEU has long been a challenge. Several approaches can be used to evaluate the reliability of a given design. One important approach is injecting fault into the configuration memory of a device.The existing fault injection frameworks are specific in the property e.g. providing speed only, neglecting other properties of...
Designing the Structure of a PHEV Aggregator in Multi-Carrier Energy Environment
, Ph.D. Dissertation Sharif University of Technology ; Abbaspour Tehrani Fard, Ali (Supervisor) ; Fotuhi Firuzabad, Mahmoud (Supervisor)
Abstract
Large penetration of electric vehicles and distributed generation (DG) resources in upcoming years will change the future vision of distribution networks from some passive load points into active ones. The imposed load of electric vehicles charging has caused many new challenges in operation and planning studies of distribution network. In contrast, the abilities of electric vehicles in feeding back power into the network (V2G programs) has attracted attention from grid operators and also vehicles owners. So, the problem of managing charging and discharging behaviors of electric vehicles has been introduced as a hot research topic in recent year. This dissertation as the first effort in this...