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检索条件"机构=Electrical Engineering Department and Centre of Excellence in Power System Management and Control"

共 115 条记录，以下是71-80 订阅

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Optimal RTU placement in power distribution systems using a novel method based on analytical hierarchical process (AHP)

Optimal RTU placement in power distribution systems using a ...

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International Conference on Environment and electrical engineering

作者： Dehghanian, Payman Kazemi, Ali Razi Fotuhi-Firuzabad, Mahmud Center of Excellence in Power System Management and Control Electrical Engineering Department Sharif University of Technology Tehran Iran

ISBN: (纸本)9781424487820

In a practical power system, automating all the substations is neither affordable nor economically justifiable. On the other hand, the trend for electric power subsidies elimination in some regions, such as Iran, aggravates this situation. To enhance the cost effectiveness of distribution automation system, this paper proposes a novel applicable qualitative-quantitative method using analytical hierarchical process (AHP) to find the optimum placement of remote terminal units (RTU). Entire attempt is to contribute all the crucial technical and practical parameters related to this problem in order to find the most reliable solution. Optimum number of RTUs is determined using the concepts of reliability cost/worth taking into account the total cost of customer interruption and investment cost of RTUs. The effectiveness of the proposed technique is validated on a real distribution feeder of Iran's power grid. © 2011 IEEE.

关键词： Cost effectiveness

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Investigation of the effects of compact fluorescent lamps in power distribution systems

Investigation of the effects of compact fluorescent lamps in...

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International Conference on Environment and electrical engineering

作者： Ghafuri, Mohsen Kazemi, Ali Razi Dehghanian, Payman Vakilian, Mehdi Center of Excellence in Power System Management and Control Electrical Engineering Department Sharif University of Technology Tehran Iran

ISBN: (纸本)9781424487820

The desire to decrease electrical loading by using energy efficient lighting has resulted in a high level of attention to replacing conventional incandescent lamps with compact fluorescent lamps (CFL). In Iran from energy management point of view, people are encouraged by ministry of power to use CFLs. Also after elimination of subsidies, the substantial increase in electric energy price resulted in a high level of penetration of CFLs in electricity grid. CFL is a nonlinear load, therefore it injects harmonic to the network. In past, due to lower application of CFL, these harmonics were ignored, however today by the widespread application of CFLs;these small sources are combined and have high effect on power distribution networks. This paper presents the results of an investigation on the effect of widespread application of CFLs on a real power distribution system of Iran. CFL has some disadvantages that should rectify gradually. However at present great use of this component may cause adverse effects especially on the distribution network. Most of the CFL disadvantages are related to its high level of harmonics. In this paper the interference of the harmonics generated by CFLs to a real distribution network of Iran power grid will be simulated and studied. Since the CFL employed in these network have a relatively poor quality, in this study three samples of the brands which are in wider use in Iran market are selected. The characteristic current of these samples are experimentally determined. After that, CFLs are modeled with considering the attenuation effect. For harmonic mitigation, optimize capacitor placement is done and at the end, Simulation results are discussed. © 2011 IEEE.

关键词： Incandescent lamps

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Simultaneous implementation of optimal demand response and security constrained unit commitment

Simultaneous implementation of optimal demand response and s...

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作者： Kia, Mohsen Reza Sahebi, Mir Mohammad Abedini Duki, Esmaeil Hamid Hosseini, Seyed Center of Excellence in Power System Control and Management Department of Electrical Engineering Sharif University of Technology Tehran Iran

ISBN: (纸本)9789644631498

Unit Commitment is the optimization process for minimizing the total cost of real power generation meeting the generating units and the system constraints. With the restructuring in power systems, the matter of great concern is the fuel cost and consequently electricity price increase in some hours of the day. Accordingly, the optimum performance of Demand Side management (DSM) has been gaining great attention recently. In this paper, the effect of the optimum performance of Emergency Demand Response Program (EDRP) on the cost of the unit commitment problem considering the line flow constrains is scrutinized. Due to the fact that the simultaneous adoption of the unit commitment and demand response program is a complex non-linear problem with numerous discrete and continuous variables, it is logical to use the linear programming technique to effectively deal with these parameters. Having the GAMS software and CPLEX method exploited, the proposed method proved its effectiveness by numerically applied to a typical 3-bus and the IEEE 24-bus systems. © 2011 Iranian Assoc of electrical.

关键词： Costs

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A probabilistic approach for remote terminal unit placement in power distribution systems

A probabilistic approach for remote terminal unit placement ...

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2011 33rd International Telecommunications Energy Conference, INTELEC 2011

作者： Razi Kazemi, Ali Asghar Dehghanian, Payman Karami, Ghasem Center of Excellence in Power System Management and Control Department of Electrical Engineering Sharif University of Technology Tehran Iran Modje Niroo Telecommunication Company Tehran Iran

ISBN: (纸本)9781457712494

This paper investigates a reliability-centered approach for the placement procedure of remote terminal units (RTUs) in power distribution systems. Entire attempt is contributed to incorporate the practical aspects interrelated with the problem, e.g. the accessibility to the candidate substations, the load point criticality, as well as the load probabilistic behavior and consequently the inevitable variation in the electricity price. The placement process is done through an optimization problem wherein the common reliability indices, as the decisive factors in the placement process, are going to be minimized. The approach is successfully applied to a real power distribution feeder of Iran's power grid and well demonstrates its applicability accompanied by its accuracy in dealing with the practical planning concerns. © 2011 IEEE.

关键词： Reliability

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Simultaneous implementation of optimal demand response and security constrained Unit Commitment [abstract only]

Simultaneous implementation of optimal demand response and s...

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Conference on electrical power Distribution Networks (EPDC)

作者： Mohsen Kia Mir Mohammad Reza Sahebi Esmaeil Abedini Duki Seyed Hamid Hosseini Center of Excellence in Power System Control and Management Department of Electrical Engineering Sharif University of Technology Tehran Iran

关键词： Indexes Security

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control of microgrids: Aspects and prospects

Control of microgrids: Aspects and prospects

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IEEE International Conference on Networking, Sensing and control

作者： A. Salehi Dobakhshari S. Azizi A. M. Ranjbar Center of Excellence in Power System Management and Control Department of Electrical Engineering Sharif University of Technology Tehran Iran

A microgrid is a controllable component of the smart grid defined as a part of distribution network capable of supplying its own local load even in the case of disconnection from the upstream network. Microgrids incorporate large amount of renewable and non-renewable distributed generation (DG) that are connected to the system either directly or by power electronics (PE) interface. The diversity of technologies used in DGs and loads, high penetration of DGs, economic operation of DGs, dynamics of low-inertia conventional DGs and PE interfaced inertialess DGs and smart operation by means of enhanced communication infrastructure have raised challenges in widespread utilization of microgrids as basis of smart grids. power quality, protection, economic and secure operation, active management, communication, dynamics and control of microgrids are among the most important issues under research both in academy and industry. Technical concerns over dynamics of microgrids especially in autonomous (island) mode necessitate revision of current paradigms in control of energy systems. This paper addresses current challenges towards controlling microgrids and surveys dynamic modeling, stability and control of microgrids. Future trends in realizing smart grids through aggregation of microgrids and research needs in this path are discussed at the end of this paper.

关键词： Load modeling power system stability power system dynamics Stability analysis Smart grids Frequency control Mathematical model

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Composite system well-being analysis using sequential Monte Carlo simulation and fuzzy algorithm

Composite system well-being analysis using sequential Monte ...

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International Conference on electrical and Electronics engineering, ELECO

作者： Bahman Alinejad Mahmud Fotuhi-Firuzabad Masood Parvania Center of Excellence in Power System Management and Control Department of electrical Engineering Sharif University of Technology Tehran Iran

Health, Margin and Risk states which in recent years are known as well-being reliability indices, provide a comprehensive adequacy assessment of bulk power system reliability studies. Conventional reliability information about power system operation only considered health and risk states which were not often adequate criteria both in system planning and utilization. It seems margin state as the intermediate condition between health and risk must be considered. Well-being method which is a approach to power system generation adequacy evaluation incorporates deterministic criteria in a probabilistic framework and provides system operating information in addition to risk assessment and can be evaluated using analytical techniques. The most important part of this approach is the algorithm for calculating the probability of each state. Besides, all system components, their behavior and their operational conditions such as transmission lines overloads and voltage drops should be considered in the calculations. In this context, this paper proposes a method to calculate more precise well-being indices using Monte Carlo simulation procedure and Fuzzy Logic algorithm while AC load flow is utilized for contingency analysis. The proposed method is then demonstrated on the RBTS to demonstrate the instance results.

关键词： Reliability Algorithm design and analysis power system reliability power transmission lines Monte Carlo methods Fuzzy logic

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An extended framework for reliability analysis of ICT for power systems

An extended framework for reliability analysis of ICT for po...

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2011 IEEE PES Trondheim powerTech: The power of Technology for a Sustainable Society, powerTECH 2011

作者： König, J. Närman, P. Franke, U. Nordström, L. Department Industrial Information and Control Systems KTH Sweden Royal Institute of Technology Sweden Department of Power System Management Swedish Centre of Excellence in Electric Power Engineering KTH Sweden IEC TC57s Swedish committee Sweden IEC's Strategic group on Smartgrids Sweden

ISBN: (纸本)9781424484195

This paper presents an extended probabilistic framework for reliability analysis of Information and Communication Technology (ICT) for power systems. The framework is based on Probabilistic Relational Models (PRMs) and includes the analysis of both primary equipment and the supporting ICT systems. The framework also separates between the functional structure and the physical infrastructure. To be able to analyze architectural properties, such as redundancy, the framework is extended with logical gates which are based on AND and OR logic. The gates serve and important purpose when integrating the framework into an analysis tool that supports PRMs. The problem without logical gates is the dynamic sizing of the conditional probability tables which depend on the number of parent nodes. This problem is solved by using aggregation functions. The application of the extended framework is demonstrated by applying to an example system-architecture with two types of redundant configurations. © 2011 IEEE.

关键词： Reliability analysis

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A New control Method of Three-Phase PMSG Wind Turbine Connected to Single-Phase Network through a Back-to-Back Converter

A New Control Method of Three-Phase PMSG Wind Turbine Connec...

引用

IEEE PES Asia-Pacific power and Energy engineering Conference (APPEEC)

作者： A. Shamsnia H. Hojabri H. Mokhtari L. Chang Center of Excellence in Power System management and Control Department of Electrical Engineering Sharif University of Technology Tehran Iran Department of Electrical Engineering University of New Brunswick Fredericton NB Canada

ISBN: (纸本)9781424462537

In this paper, a new control strategy is proposed to improve the performance of a wind generator system composed of a three-phase PMSG and a Back-to-Back three-phase to single phase converter. With the use of the large inductance of the synchronous generator, the control method minimizes the generator torque ripple when the system supplies a single-phase load. The problem arises from the fact that the instantaneous power of a single-phase load is pulsating at the double of the system frequency. This paper tries to minimize the effect of this pulsating power on the PMSG torque without using a large capacitor on the DC link. Simulation results show the effectiveness of the proposed method.

关键词： Generators Converters Torque Shafts Capacitors Equations Reactive power

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A New Crowbar Protection Method for Improvement in Performance of Doubly Fed Induction Generator under Fault Conditions

A New Crowbar Protection Method for Improvement in Performan...

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International Conference on Environment and electrical engineering

作者： Seyyed Reza Kalantarian Hossein Heydari Centre of excellence for power system operation and automation department of electrical engineering Iran University of Science and Technology (IUST)

ISBN: (纸本)9781424487790

This paper presents a new method for increasing the doubly fed induction generator (DFIG) performance under fault conditions. After the fault takes place, the rotor current increases to more than 8 times the nominal value, so the protective resistors called crowbar (Cb) will be switched on, and the current will be restricted. In order to stop injuring the rotor side convertor (RSC), the control signals of the switches are getting turned off;however, by the use of the proposed method the proper value for crowbar is chosen, and the RSC is connected to these resistors. As a result, the dc link voltage fluctuations will be limited, and the DFIG can continue supplying active and reactive power to the grid. All the simulations are carried out in Matlab, Simulink and m-file.

关键词： DFIG Crow bar Dc link voltage fluctuations Rotor side convertor

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