Search for: electricity-industry
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    Improving the cyber security by applying the maturity model case: electricity industry of Iran

    , Article 5th International Conference on Information and Communication Technology for Competitive Strategies, ICTCS 2020, 11 December 2020 through 12 December 2020 ; Volume 190 , 2021 , Pages 891-897 ; 23673370 (ISSN); 9789811608810 (ISBN) Shalmani, M. E ; Sepehri, M ; Sharif University of Technology
    Springer Science and Business Media Deutschland GmbH  2021
    Continuity and reliability of electricity supply in a country are vital to the operational continuity of the critical infrastructure and government. High levels of cyber security are required to achieve such key measures in the electricity industry. We propose solutions and models on how to improve the cyber security using the maturity model in order to achieve continuity of electricity supplies. Maturity levels start from the relative level (level 1) and continue to the adaptive level (level 4). A total of 10 domains are defined in the model. The practices of cyber security are clustered into domains. The model is used for assessment of the strength and weakness factors for the... 

    A competitive market structure for reactive power procurement

    , Article Iranian Journal of Science and Technology, Transaction B: Engineering ; Volume 30, Issue 2 , 2006 , Pages 259-276 ; 03601307 (ISSN) Mozafari, B ; Ranjbar, A. M ; Amraee, T ; Shirani, A. R ; Sharif University of Technology
    This paper first proposes a competitive market structure for reactive power procurement and then develops a methodology for incorporating voltage stability problems into the model. The owners of electric transactions should participate in this competitive framework and submit their own firmness bids in ($/MW) to the Independent/System/Market Operator (ISOIMO). ISO clears the market for reactive energy regarding the value of each transaction and utilization cost of reactive power on one hand, and the impact of transaction amount on the voltage security of the power system on the other hand. Here, the voltage stability margin is incorporated into the power flow equations so that the security... 

    Reserve procurement & pricing via joint dispatch in restructured electricity industry

    , 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 921-925 ; 14746670 (ISSN) Rashidinejad, M ; Fotuhi Firuzabad, M ; Song, Y. H ; Sharif University of Technology
    IFAC Secretariat  2003
    Procurement and pricing of electric power and ancillary services is one of the most important issues of electricity market manager under new restructured environment. Ancillary services are necessary to provide security and reliability constraints applied to the dispatching and scheduling problem while they are essential for commercial functions. In a market payments should be based on energy and ancillary services capacities. Spinning Reserve (SR) is an ancillary service that is coupled with energy capacity, should be procured and priced via a joint economic dispatch mechanism to provide a right signal for all electricity customers. This paper presents a new approach for joint economic... 

    Reliability evaluation of deregulated electric power systems for planning applications

    , Article Reliability Engineering and System Safety ; Volume 93, Issue 10 , 2008 , Pages 1473-1484 ; 09518320 (ISSN) Ehsani, A ; Ranjbar, A. M ; Jafari, A ; Fotuhi Firuzabad, M ; Sharif University of Technology
    In a deregulated electric power utility industry in which a competitive electricity market can influence system reliability, market risks cannot be ignored. This paper (1) proposes an analytical probabilistic model for reliability evaluation of competitive electricity markets and (2) develops a methodology for incorporating the market reliability problem into HLII reliability studies. A Markov state space diagram is employed to evaluate the market reliability. Since the market is a continuously operated system, the concept of absorbing states is applied to it in order to evaluate the reliability. The market states are identified by using market performance indices and the transition rates... 

    A new structure for electricity market scheduling

    , Article 2006 International Conference on Power Electronics, Drives and Energy Systems, PEDES '06, New Delhi, 12 December 2006 through 15 December 2006 ; 2006 ; 078039772X (ISBN); 9780780397729 (ISBN) Soleymani, S ; Ranjbar, A. M ; Shirani, A. R ; Sharif University of Technology
    On pool market structure, the generating units are typically dispatched in order of lowest to highest bid as needed to meet demand requirement as well as considering network constraints. Generally, no account is taken of generating unit's reliability when scheduling them. This paper proposes a new structure for electricity market to consider generating unit's reliability in the scheduling problem. GAMS (General Algebraic Modeling System) language has been used to solve the social welfare maximization problem using CPLEX optimization software with mixed integer programming. ©2006 IEEE  

    Short-term market power assessment in a long-term dynamic modeling of capacity investment

    , Article IEEE Transactions on Power Systems ; Volume 28, Issue 2 , October , 2013 , Pages 626-638 ; 08858950 (ISSN) Hasani Marzooni, M ; Hosseini, S. H ; Sharif University of Technology
    This paper proposes a dynamic time simulation model for long-term generation capacity investment decisions in the presence of either perfect or imperfect electricity market. The model is based on system dynamics concept in which the dynamics of capacity construction is traced using the forecast of electricity price cleared in the short-term electricity market. Both the perfect and oligopolistic competitions are considered and a market power index is defined to evaluate the competition level of the electricity market. The short-term and long-term dynamic analysis are used to represent the generation firms' behavior in bidding strategy and capacity investment, respectively. Both possibilities... 

    Rescheduling of power systems constrained with transient stability limits in restructured power systems

    , Article Electric Power Systems Research ; Volume 81, Issue 1 , 2011 , Pages 1-9 ; 03787796 (ISSN) Kheradmandi, M ; Ehsan, M ; Feuillet, R ; Hadj-Saied, N ; Sharif University of Technology
    This paper investigates various approaches to relieve the transient stability constraint in restructured power systems. The approaches adopted fall into two broad categories: those based on eliminating the constraint in the least-cost way and those based on eliminating with the least possible rescheduling. The latter group can, on the other hand, emerge in the form of a pool-protected policy in which the bilateral contracts are rescheduled to maintain the stability or in the form of a contract-protected policy in which the realizable bilateral contracts are maximized while minimizing the rescheduling in pool market. Transient energy function (TEF) method is used as a tool to calculate the... 

    New approach to bidding strategies of generating companies in day ahead energy market

    , Article Energy Conversion and Management ; Volume 49, Issue 6 , 2008 , Pages 1493-1499 ; 01968904 (ISSN) Soleymani, S ; Ranjbar, A. M ; Shirani, A. R ; Sharif University of Technology
    In the restructured power systems, generating companies (Genco) are responsible for selling their product in the energy market. In this condition, the question is how much and for what price must each Genco generate to maximize its profit. Therefore, this paper intends to propose a rational method to answer this question. In the proposed methodology, the hourly forecasted market clearing price (FMCP) is used as a reference to model the possible and probable price strategies of Gencos. The forecasted price is the basis of the bidding strategies of each Genco, which can be achieved by solving a bi-level optimization problem using GAMS (general algebraic modeling system) language. The first... 

    Strategic bidding of generating units in competitive electricity market with considering their reliability

    , Article International Journal of Electrical Power and Energy Systems ; Volume 30, Issue 3 , 2008 , Pages 193-201 ; 01420615 (ISSN) Soleymani, S ; Ranjbar, A. M ; Shirani, A. R ; Sharif University of Technology
    In the restructured power systems, they are typically scheduled based on the offers and bids to buy and sell energy and ancillary services (AS) subject to operational and security constraints. Generally, no account is taken of unit reliability when scheduling it. Therefore generating units have no incentive to improve their reliability. This paper proposes a new method to obtain the equilibrium points for reliability and price bidding strategy of units when the unit reliability is considered in the scheduling problem. The proposed methodology employs the supply function equilibrium (SFE) for modeling a unit's bidding strategy. Units change their bidding strategies and improve their... 

    A new approach for bidding strategy of gencos using particles swarm optimization combined with simulated annealing method

    , Article Iranian Journal of Science and Technology, Transaction B: Engineering ; Volume 31, Issue 3 , 2007 , Pages 303-315 ; 03601307 (ISSN) Soleymani, S ; Ranjbar, A. M ; Bagheri Shouraki, S ; Shirani, A. R ; Sadati, N ; Sharif University of Technology
    This paper describes a procedure that uses particle swarm optimization (PSO) combined with the simulated annealing (SA) to analyze the bidding strategy of Generating Companies (Gencos) in an electricity market where they have incomplete information about their opponents. In the proposed methodology, Gencos prepare their strategic bids according to the Supply Function Equilibrium (SFE) model and they change their bidding strategies until Nash equilibrium points are obtained. Nash equilibrium points constitute a central solution concept in the game theory and are computed with solving a global optimization problem. In this paper a new computational intelligence technique is introduced that can... 

    Operational risk evaluation in competitive electricity market scheduling

    , Article 2006 International Conference on Power System Technology, POWERCON2006, Chongqing, 22 October 2006 through 26 October 2006 ; 2006 ; 1424401119 (ISBN); 9781424401116 (ISBN) Ehsani, A ; Ranjbar, A. M ; Fotuhi Firuzabad, M ; Samani, S. C ; Mozafari, B ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2006
    Electric power systems are typically operated at least cost subject to technical and reliability constraints. This paper presents a probabilistic approach for risk evaluation in competitive electricity market scheduling. A competitive structure is proposed which includes a purchasing agency with centrally optimized scheduling (MaxISO structure). Spinning and non-spinning reserves are considered in the proposed approach. The value of unit commitment risk is deduced from the generation model. The required generation model is constructed using the outage replacement rate (ORR) of units. The load forecast uncertainty is included in operational risk evaluation. This is due to the increased... 

    Enhancing electricity market flexibility by deploying ancillary services for flexible ramping product procurement

    , Article Electric Power Systems Research ; Volume 191 , 2021 ; 03787796 (ISSN) Khoshjahan, M ; Fotuhi Firuzabad, M ; Moeini Aghtaie, M ; Dehghanian, P ; Sharif University of Technology
    Elsevier Ltd  2021
    The escalated penetration of wind energy in the electric industry has by large contributed to an intensified uncertainty and variability of the net-load, i.e., the difference between stochastic demand and intermittent supply. In response, some Independent System Operators (ISOs) have recently introduced the Flexible Ramping Product (FRP) to heighten the grid flexibility via effective hosting of the uncertain renewables. This paper suggests a novel framework for optimal FRP provision in real-time markets (RTM) in which the shortage in the RTM ramp capacity is compensated by optimal deployment of day-ahead procured spinning reserve. In the envisioned mechanism, the ISO can deploy specific... 

    Market power monitoring in electricity market by using market simulation

    , Article 2006 IEEE Power India Conference, New Delhi, 10 April 2006 through 12 April 2006 ; Volume 2005 , 2005 , Pages 509-514 ; 0780395255 (ISBN); 9780780395251 (ISBN) Soleymani, S ; Ranjbar, A. M ; Jafari, A ; Shirani, A. R ; Ranjbar, M ; Sharif University of Technology
    This paper describes a new method for analyzing the bidding strategies of Generating Companies (GENCOs) in the Independent System Operator (ISO) point of view. ISO uses these results to detect the participants that have the potential for market power or actual exercise of market power. ISO models all GENCOs with perfect information. The proposed methodology uses the marginal cost of GENCOs as an initial point for bidding strategies of GENCOs and improves bidding strategies based on the objective function of GENCOs, the state of them in each hour of the day and with regard to ISO's market clearing problem. ISO tries to maximize the social welfare or minimize consumer's payments. The model... 

    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) Rajabi Ghahnavie, A ; Fotuhi Firuzabad, M ; Sharif University of Technology
    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... 

    Impact of penalty-reward mechanism on the performance of electric distribution systems and regulator budget

    , Article IET Generation, Transmission and Distribution ; Vol. 4, issue. 7 , 2010 , p. 770-779 ; ISSN: 17518687 Mohammadnezhad-Shourkaei, H ; Fotuhi-Firuzabad, M ; Sharif University of Technology
    As a part of the ongoing debate about competition in the electricity industry, regulators are increasingly considering performance-based regulation (PBR) as an alternative to improve the service quality. The fundamental principle behind PBR is that good performance should lead to higher profits, and poor performance should result in lower profits. A penalty-reward structure (PRS) in a PBR mechanism can enhance utility performance to align utility interests with customer's interests. During the implementation of PBR, regulators should spend or receive money to reward good performed utilities or penalised poor performed utilities, respectively. A technique is proposed, in this study, to not... 

    Dynamic interactions of TGC and electricity markets to promote wind capacity investment

    , Article IEEE Systems Journal ; Volume 6, Issue 1 , 2012 , Pages 46-57 ; 19328184 (ISSN) Hasani Marzooni, M ; Hosseini, S. H ; Sharif University of Technology
    This paper proposes a time simulation model for long-term wind capacity investment decisions in the presence of electricity market and tradable green certificate (TGC) market. Investment decisions and wind capacity development are fundamentally based on incentives gained from both these markets. In TGC market, the tradable certificates are issued to renewable generation companies for each megawatt-hour of electricity generation. Distribution companies are obligated to support fraction of their electricity consumptions from renewable sources. The dynamics of prices in both markets are simulated in a system dynamics model to trace the dynamics of wind capacity investment. Such a decision model... 

    Economic impact of price forecasting inaccuracies on self-scheduling of generation companies

    , Article Electric Power Systems Research ; Volume 81, Issue 2 , February , 2011 , Pages 617-624 ; 03787796 (ISSN) Mohammadi Ivatloo, B ; Zareipour, H ; Ehsan, M ; Amjady, N ; Sharif University of Technology
    This paper studies the economic impact of using inaccurate price forecasts on self-scheduling of generation companies (GenCos) in a competitive electricity market. Four alternative sets of price forecasts are used in this study which have different levels of accuracy. The economic impact of price forecast inaccuracies is calculated by comparing the economic benefits of the GenCos in two self-scheduling scenarios. In the first scenario, electricity market price forecasts are used to optimally schedule the GenCos' next day operation. In the second scenario, perfect price forecasts, i.e., actual market prices, are used for self-scheduling of the GenCos. Two indices are utilized to quantify the... 

    Dynamic assessment of capacity investment in electricity market considering complementary capacity mechanisms

    , Article Energy ; Volume 36, Issue 1 , January , 2011 , Pages 277-293 ; 03605442 (ISSN) Hasani, M ; Hosseini, S. H ; Sharif University of Technology
    This paper proposes a decentralized market-based model for long-term capacity investment decisions in a liberalized electricity market. Investment decisions are fundamentally based on total revenues gained by investors. In most electricity markets, the complementary mechanisms are designed to ensure a desired level of reliability while covering investment costs of the suppliers. In such an environment, investment decisions are highly sensitive to expectation of price signals in both of energy market and capacity mechanisms. In this work, the system dynamics concepts are used to model the structural characteristics of electricity market such as, long-term firms' behavior and relationships... 

    Identifying critical components for reliability centred maintenance management of deregulated power systems

    , Article IET Generation, Transmission and Distribution ; Volume 9, Issue 9 , 2015 , Pages 828-837 ; 17518687 (ISSN) Ghorani, R ; Fotuhi Firuzabad, M ; Dehghanian, P ; Li, W ; Sharif University of Technology
    Competition in the electric power industry urges utilities to not only reduce the investment costs, but also to reasonably cut the operation and maintenance expenses as much as possible, while keeping both power quality and reliability requirements met. Reliability-centred maintenance (RCM) has been proven to be in response to this dilemma in power systems and has been yet successfully applied in various engineering contexts. This study introduces a novel approach, as of the first steps of RCM implementation in composite power generation and transmission systems, to identify the critical components for the main sake of a more focused maintenance management. Criticality evaluation is, here,... 

    Bidding strategy in pay-as-bid markets based on supplier-market interaction analysis

    , Article Energy Conversion and Management ; Volume 51, Issue 12 , 2010 , Pages 2419-2430 ; 01968904 (ISSN) Bigdeli, N ; Afshar, K ; Fotuhi Firuzabad, M ; Sharif University of Technology
    In this paper, a new bidding strategy for pay-as-bid market suppliers is introduced. This method is based on a systematic analysis of interactions of market with the suppliers via several market indices as well as forecasting important indices by artificial neural networks. Besides, the proposed method considers the practical limitations in the system and deals with incomplete information handling, closely. Next, a strategic bidding approach is proposed for optimal bidding by the suppliers. In these investigations, the paper focus is on the experimental situation of Iran electricity market as a pay-as-bid market and a sample generating company with several generating units from this market...