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maintenance-scheduling
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Resilience oriented water and energy hub scheduling considering maintenance constraint
, Article Energy ; Volume 158 , 2018 , Pages 1092-1104 ; 03605442 (ISSN) ; Mozafari, B ; Ranjbar, A. M ; Torabi, T ; Sharif University of Technology
Elsevier Ltd
2018
Abstract
In this paper resilience oriented water and energy hub scheduling for a remote area is presented. The optimal operation scheduling considering maintenance programming and reliability indices are presented. Demands which include electricity, heat and drinking waters are supplied by diesel generators, boilers, combined heat and power units, and drinking water sources such as desalination units and transferring water. The considered system contains renewable energy resources such as wind turbine and photovoltaic arrays as well as electrical storage units. In order to enhance resiliency of system against forced outages of components and regular maintenance programs, maintenance constraints and...
Reliability-based maintenance scheduling of generating units in restructured power systems
, Article Turkish Journal of Electrical Engineering and Computer Sciences ; Vol. 22, issue. 5 , 2014 , p. 1147-1158 ; ISSN: 13000632 ; Aminifar, F ; Shahzadeh, A ; Sharif University of Technology
Abstract
Maintenance scheduling of generating units in restructured power systems is a collaborative and interactive process between independent system operators (ISOs) and generating companies (GENCOs). The ISO should comply with GENCO maintenance preferences subject to targeted system reliability levels. This process might be multistage since the admission of all initial unit outage requests may threaten system reliability. Hence, the ISO accepts some proposals and determines alternatives for the remaining units. The GENCOs are then allowed to confirm the alternatives or revise them. In this paper the ISO problem of generating unit maintenance scheduling is tackled. The objective function is to...
Assessment of equipments Condition Monitoring (CM)in Khouzestan Steel Co
, M.Sc. Thesis Sharif University of Technology ; Mostafavi, Mostafa (Supervisor) ; Behzad, Mehdi (Supervisor)
Abstract
Managing industries into the 21st century is a challenging task, because of increasing global competition, fast technological change, consumer’s perceptions towards total quality, reliability, health and safety, environmental considerations and changes in management structure.To overcome these difficulties, maintenance planning is a must such as condition monitoring (CM) technologies.Khouzestan Steel Company as the second largest Steel manufacturer in Iran, using some CM techniques & tools - like VCM, OCM, TCM and … - to maintain its continuous improvement.To assess what KSC has done, we focus on cost-benefit (CB) and availability; BY defining three phases: 1) Data Gathering, 2) Calculation...
Application of Markov decision process in generating units maintenance scheduling
, Article 2006 9th International Conference on Probabilistic Methods Applied to Power Systems, PMAPS, Stockholm, 11 June 2006 through 15 June 2006 ; 2006 ; 9171783520 (ISBN); 9789171783523 (ISBN) ; Fotuhi Firuzabad, M ; Sharif University of Technology
2006
Abstract
An important issue in power system planning is maintenance scheduling of generating units. In a traditional power system, the problem of maintenance scheduling is of high importance and has various technical and economical constraints. Different methods have been used to solve the problem. On the other hand, changes in legal environment of electricity industry poses new bound and requirements on the maintenance scheduling problem. This paper presents a new approach on maintenance scheduling of generating units in a generating company (GENCO). The proposed approach uses Markov Decision Process (MDP) to minimize total costs of unserved energy and reserve. The impacts on maintenance scheduling...
Maintenance Planning at Generation by GENCO & ISO in Restructured Power System
, M.Sc. Thesis Sharif University of Technology ; Ehsan , Mehdi (Supervisor)
Abstract
In a centralized power system, the system operator, derives a maintenance scheduling plan that maximizing reliability of system and minimizing operating cost. But in a restructured power system the goals of GENCOs and independent system operator (ISO) are separate and each of them optimize its own goal. The goal of each GENCO is to maximize its annual benefits and the goal of ISO is to maximize the reliability of system throughout the year. Therefore there are two objective functions for finding an optimum maintenance schedule in restructured power system. This thesis proposes a new method for maintenance scheduling of generation units in a restructured power system. Firstly each GENCO...
A Comprehensive Model for Aircraft Maintenance Routing
, M.Sc. Thesis Sharif University of Technology ; Shafahi, Yousef (Supervisor)
Abstract
One of the fundamental constraints that should have been in mind in flight scheduling is aircraft maintenance scheduling. Based on the accepted rules, regulations and flight safety, in a given period of time or after definite number of flight hours each aircraft should be sent to maintenance site. This influences the flight schedule. This research provides a comprehensive model for the flight scheduling. Given the flight schedule, number of the flights and aircrafts, maintenance center's capacity and other parameters such as each check's time, allowable flight days and allowable flight hours this model could determine each season's flight schedule and solve the aircraft routing problem....
Scheduling of Refinary Overhaul Activities Under Uncertainty, Case Study: Glycol Regeneration Unit of Farashband Refinary
, Ph.D. Dissertation Sharif University of Technology ; Shadrokh, Shahram (Supervisor)
Abstract
In order to maintain system reliability and high production rate, at oil, gas and petrochemical industries and other manufacturing plants, the plant is shut down and the planned maintenance activities are done on machines and equipment. In this research, a robust reliability-based scheduling for the maintenance activities are considered, in which the duration of maintenance activities and also project deadline are uncertain, start date and finish date of the shutdown are predefined and maintenance activities can be done in the multi-mode. The proposed problem is a multi-mode time-constrained project scheduling problem (MTCPSP). The glycol regeneration unit in a gas refinery is studied as the...
Priority Assessment of Online Monitoring Investment for Power System Circuit Breakers - Part I: Qualitative-Quantitative Approach
, Article IEEE Transactions on Power Delivery ; Volume 28, Issue 2 , 2013 , Pages 928-938 ; 08858977 (ISSN) ; Vakilian, M ; Niayesh, K ; Lehtonen, M ; Sharif University of Technology
2013
Abstract
Recognition of the circuit-breaker's (CB) vital role in reliable operation and protection of power systems (i.e., during energization, disconnecting loads, and clearing faults), helps to understand the requirement and importance of its maintenance management as well as maintenance scheduling. Condition-based maintenance (CBM), employing online monitoring (OLM) of CBs, has been long reported as the most practical maintenance policy on the power system CBs. There are a large number of CBs in a power system to be monitored; however, to address the financial limitations for OLM implementation (in utilities), a method will be proposed to find the most critical breakers for enforcing effectively...
A robust reliability-based scheduling for the maintenance activities during planned shutdown under uncertainty of activity duration
, Article Computers and Chemical Engineering ; Volume 130 , 2019 ; 00981354 (ISSN) ; Shadrokh, S ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
Scheduling of the maintenance activities is considered, in which the duration of activities is uncertain, delivery date of the maintenance shutdown is predefined, and activities are multi-mode. The problem is a multi-mode time-constrained project scheduling problem (MTCPSP). The glycol regeneration unit in a gas refinery is as the case study. Based on the effect of equipment or sub-equipment on the system reliability, the importance value of equipment and sub-equipment within the system is determined, and these values are used in a heuristic algorithm as a priority rule for choosing activities in the schedule. Outcomes demonstrate the performance of the algorithm in early or on time delivery...
An efficient mixed-integer linear formulation for long-term overhead lines maintenance scheduling in power distribution systems
, Article IEEE Transactions on Power Delivery ; Volume 24, Issue 4 , 2009 , Pages 2043-2053 ; 08858977 (ISSN) ; Fotuhi Firuzabad, M ; Abbasi, E ; Sharif University of Technology
2009
Abstract
This paper presents an efficient mixed-integer linear formulation for long term maintenance schedule of overhead lines. The proposed formulation is based on risk management approach and utilizes the model of decoupled risk factors. The proposed methodology yields a significant computational saving comparing to the previously reported dynamic programming. Risk management approach enables the asset managers to consider the actual condition of electrical equipment and expected consequence of their failures. Furthermore, the decoupled risk strategy in conjunction with the mixed-integer linear programming formulation establishes a precise description of time-dependent deterioration failure rate...
Optimized midterm preventive maintenance outage scheduling of thermal generating units
, Article IEEE Transactions on Power Systems ; Vol. 27, issue. 3 , 2012 , p. 1354-1365 ; ISSN: 08858950 ; Fotuhi-Firuzabad, M ; Parvania, M ; Sharif University of Technology
Abstract
This paper addresses the midterm preventive maintenance outage scheduling problem of thermal generating units which is becoming increasingly important due to the aging of power generation fleet. In this context, a novel midterm preventive maintenance outage scheduler is proposed based on decision tree and mixed integer linear formation which explicitly considers the thermal units aging momentum in terms of failure rate. This allows the system operators to determine the thermal units' maintenance outage window based on the cost/benefit analysis of preventive maintenance tasks while optimizing the time interval between consecutive maintenance tasks. Additionally, the division of the year-long...
Optimized midterm preventive maintenance outage scheduling of thermal generating units
, Article IEEE Transactions on Power Systems ; Volume 27, Issue 3 , 2012 , Pages 1354-1365 ; 08858950 (ISSN) ; Fotuhi Firuzabad, M ; Parvania, M ; Sharif University of Technology
2012
Abstract
This paper addresses the midterm preventive maintenance outage scheduling problem of thermal generating units which is becoming increasingly important due to the aging of power generation fleet. In this context, a novel midterm preventive maintenance outage scheduler is proposed based on decision tree and mixed integer linear formation which explicitly considers the thermal units aging momentum in terms of failure rate. This allows the system operators to determine the thermal units' maintenance outage window based on the cost/benefit analysis of preventive maintenance tasks while optimizing the time interval between consecutive maintenance tasks. Additionally, the division of the year-long...
Evaluation of demand side behaviors in cost-emission based PM scheduling under restructured environment
, Article 24th Iranian Conference on Electrical Engineering, ICEE 2016, 10 May 2016 through 12 May 2016 ; 2016 , Pages 885-890 ; 9781467387897 (ISBN) ; Rashidinejad, E ; Rashidinejad, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2016
Abstract
Security constrained Preventive Maintenance (PM) scheduling is addressed as a crucial issue especially coping with new challenges of smart grids. Under the smart grid environment, Demand Response Resources (DRRs) are considered as virtual power plants in energy policy decisions which affect the controllability of power system ranging from short-term to long-term. Here, DRRs are regarded as a virtual resource of capacity reserve acquisition. Furthermore, under new environment, multifarious objectives will be imposed to PM scheduling which can be replicated into a single objective problem via a weighted approach with consideration of arbitrary weighting coefficients. In this paper, a new...
Reliability modeling and availability analysis of combined cycle power plants
, Article International Journal of Electrical Power and Energy Systems ; Volume 79 , 2016 , Pages 108-119 ; 01420615 (ISSN) ; Abbaspour, A ; Fotuhi Firuzabad, M ; Dehghanian, P ; Sharif University of Technology
Elsevier Ltd
Abstract
Power plant successful operation is always a function of its constituent sub-systems and components. Due to the current financial constraints in power industry, power plant operators are continuously facing a wide range of challenges when dealing with maintenance scheduling and asset management practices of the plant sub-systems. Knowledge on the roles and criticality of the constituent components on the plant overall performance will help in establishing the plans for its smooth, safe, and economic operation. To ensure making the techno-economical decisions on the maintenance of power plant equipment, this paper focuses on the reliability modeling of the combined cycle power plants (CCPP)....
Critical component identification in reliability centered asset management of power distribution systems via fuzzy AHP
, Article IEEE Systems Journal ; Vol. 6, issue. 4 , 2012 , p. 593-602 ; ISSN: 19328184 ; Fotuhi-Firuzabad, M ; Bagheri-Shouraki, S ; Razi Kazemi, A. A ; Sharif University of Technology
Abstract
Confronted with the power system restructuring trend reforming the past-regulated power systems, the need for a narrower insight on the costly maintenance strategies seems imperative. It falls within the realm of reliability centered maintenance to enhance the cost effectiveness of power distribution maintenance policies. From a practical point of view, this paper devises a novel approach on the basis of the analytical hierarchical process (AHP) accompanied by fuzzy sets theory to determine the most critical component types of distribution power systems to be prioritized in maintenance scheduling. In the presence of many qualitative and quantitative attributes, fuzzy sets can effectively...
Risk based maintenance optimization of overhead distribution networks utilizing priority based dynamic programming
, Article 2009 IEEE Power and Energy Society General Meeting, PES '09, 26 July 2009 through 30 July 2009, Calgary, AB ; 2009 ; 9781424442416 (ISBN) ; Fotuhi Firuzabad, M ; Abiri Jahromi, A ; Sharif University of Technology
Abstract
This paper presents a priority based dynamic programming approach for long term maintenance scheduling of overhead distribution networks. The proposed approach is based on risk management approach and utilizes the model of decoupled risk factors. Two heuristic factors are defined and utilized in order to establish a maintenance priority list and to curtail the dynamic programming search space. The proposed methodology yields a significant computational saving compare to the previously reported dynamic programming. Risk management approach enables the asset managers to consider the actual condition of electrical equipments and expected consequence of their failures. Furthermore, the decoupled...