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检索条件"机构=Center of Excellence in Electrical Power System Management and Control"

共 130 条记录，以下是81-90 订阅

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

A probabilistic approach for remote terminal unit placement ...

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International Conference on Telecommunications Energy (INTELEC)

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

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.

关键词： Integrated circuits Reliability

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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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Assessing impact of demand response in emission-constrained environments

Assessing impact of demand response in emission-constrained ...

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IEEE General Meeting power& Energy Society

作者： Masood Parvania Mahmud Fotuhi-Firuzabad Mohammad Shahidehpour Center of Excellence in Power System Control and Management Electrical Engineering Department Sharif University of Technology Tehran Iran ECE Department Illinois Institute of Technology Chicago USA

Reducing the emissions produced by the electric power production may be one of the most challenging problems of the electricity sector in the coming future. As one of the potential solutions, demand response (DR) can play an important role to reduce emissions and costs associated with emission reduction activities. This paper aims to assess the short-term impacts of running a DR program on a power system constrained by emissions caps. The DR program is designed to procure operating reserve from demand-side participants. A day-ahead network-constrained market clearing model with emission cap constraints is used as the assessment tool, where the DR program participants along with generating units are considered as available resources to provide reserve for the system. A model is also presented for reserve provided by DRPs and its associated cost function. The proposed approach is applied to the IEEE-RTS to illustrate the impacts of the DR program.

关键词： Spinning power systems ISO Indexes Load management Electricity power generation

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Residential Loads Modeling by Norton Equivalent Model of Household Loads

Residential Loads Modeling by Norton Equivalent Model of Hou...

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

作者： M. J. Ghorbani M. Shafiee Rad H. Mokhtari M. E. Honarmand M. Youhannaie Center of Excellence in Power System Management and Control (CEPSMC) Sharif University of Technology Tehran Iran Gilan Electric Power Distribution Company Gilan Iran

ISBN: (纸本)9781424462537

These days the number of nonlinear loads in power systems is increasing dramatically. These nonlinear loads inject harmonic currents and the voltages. Accordingly, the modeling of these loads and analysis of their effects on power quality has gained much attention. This paper presents harmonic models for residential appliances. The model is based on Norton equivalent technique. The parameters of appliances models are determined using measurements. These models are then verified by comparison with the measurements results for each load. Based on the developed individual loads, an estimate for a household/an office customer is found and the harmonic content for such customers is estimated. An index for power quality deterioration for residential loads is also introduced and the loads are ranked based on this index.

关键词： Load modeling Harmonic analysis power system harmonics Current measurement Home appliances Voltage measurement power quality

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Hierarchical control scheme for voltage harmonics compensation in an islanded droop-controlled microgrid

Hierarchical control scheme for voltage harmonics compensati...

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2011 IEEE 9th International Conference on power Electronics and Drive systems, PEDS 2011

作者： Savaghebi, Mehdi Guerrero, Josep M. Jalilian, Alireza Vasquez, Juan C. Lee, Tzung-Lin Center of Excellence for Power System Automation and Operation Iran University of Science and Technology Iran Department of Automatic Control and Industrial Informatics Technical University of Catalonia Spain Institute of Energy Technology Aalborg University Denmark Department of Electrical Engineering National Sun Yat-sen University Taiwan

ISBN: (纸本)9781612849997

In this paper, a microgrid hierarchical control scheme is proposed which includes primary and secondary control levels. The primary level comprises distributed generators (DGs) local controllers. The local controller mainly consists of active and reactive power controllers, voltage and current controllers, and virtual impedance loop. A novel virtual impedance structure is proposed to achieve proper sharing of non-fundamental power among the microgrid DGs. The secondary level is designed to manage compensation of voltage harmonics at the microgrid load bus (LB) to which the sensitive loads may be connected. Also, restoration of LB voltage amplitude and microgrid frequency to the rated values is directed by the secondary level. These functions are achieved by sending proper control signals to the local controllers. The simulation results show the effectiveness of the proposed control scheme. © 2011 IEEE.

关键词： controllers

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Voltage harmonic compensation of a microgrid operating in islanded and grid-connected modes

Voltage harmonic compensation of a microgrid operating in is...

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作者： Savaghebi, Mehdi Jalilian, Alireza Vasquez, Juan C. Guerrero, Josep M. Lee, Tzung-Lin Center of Excellence for Power System Automation and Operation Iran Univ. of Science and Technology Iran Department of Automatic Control and Industrial Informatics Technical University Catalonia Spain Department of Energy Technology Aalborg University Denmark Department of Electrical Engineering National Sun Yat-sen University Taiwan

ISBN: (纸本)9789644634284

In this paper, a method for voltage harmonic compensation in a microgrid operating in islanded and grid-connected modes is presented. Harmonic compensation is done through proper control of distributed generators (DGs) interface converters. In order to achieve proper sharing of the compensation effort among the DGs, a power named Harmonic Distortion power (HDP) is defined. In the proposed method, the active and reactive power control loops are considered to control the powers injected by the DGs. Also, a virtual impedance loop and voltage and current proportional-resonant controllers are included. Simulation results show the effectiveness of the proposed method for compensation of voltage harmonics to an acceptable level. © 2011 AmirKabir Univ of Tech.

关键词： Distributed power generation

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

ISBN: (纸本)9781424487790

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.

关键词： Compact fluorescent lamps Incandescent lamps Harmonic Modeling Attenuation effect Capacitor placement

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

ISBN: (纸本)9781424487790

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.

关键词： Component AHP Automation Placement Remote Terminal Units Cost/Worth Analysis

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Discrete Fourier Transform Based Approach to Forecast Monthly Peak Load

Discrete Fourier Transform Based Approach to Forecast Monthl...

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Asia-Pacific power and Energy Engineering Conference

作者： M. Beiraghi A. M. Ranjbar Electrical Engineering Department Sharif University of Technology (SUT) Center of Excellence for Power System Management & Control

ISBN: (纸本)9781424462537

This paper presents a new method in order to predict the monthly electricity peak load of a country based on the prediction of Discrete Fourier Transform (DFT) of monthly peak electricity demand variation using the ARIMA methodology. For validation, the result of this method was used to predict monthly peak load variation of the recent two years in Iranian national grid. The primary goal of this article is to show the application and implementation of Discrete Fourier Transform to predict monthly variation of electricity peak load in national electric power systems. Furthermore, it is elaborated to demonstrate the benefits and shortcomings of DFT approach comparing to the commonly used methodologies known by time series approximation. Comparing the predicted and real value of monthly peak load in the recent years indicates a good and reliable prediction by the new applied methodology.

关键词： Load Forecasting ARIMA Method Discrete Fourier Transform

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