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

共 189 条记录，以下是111-120 订阅

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

Hierarchical control scheme for voltage harmonics compensati...

引用

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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Determination of optimum generation level in DTEP using a GA-based quadratic programming

Determination of optimum generation level in DTEP using a GA...

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作者： Haddadian, H. Hosseini, S.H. Shayeghi, H. Shayanfar, H.A. Technical Engineering Department Zanjan University Zanjan Iran Technical Engineering Department University of Mohaghegh Ardabili Daneshgah Street P.O. Box: 179 Ardabil Iran Center of Excellence for Power System Automation and Operation Electrical Engineering Department Iran University of Science and Technology Tehran Iran

In this paper, a new approach by accomplishing dynamic transmission expansion planning (DTEP) problem, the optimum generation level of generators is determined for annual load peak using a genetic algorithm (GA) based quadratic programming (QP) method. This study is carried out in order to achieve a better prospect from the generation network and consequently the suitable planning for its future expansion. Another important aspect of this paper is taking the advantage of line outage distribution factors (LODFs) or sensitivity analysis for the evaluation of network reliability instead of the direct current load flow (DCLF), that the computations and performance of DTEP problem considerably speeds up in comparison with previous researches. Also, the applied coding for problem solution using GA is more flexible and is significantly improved the performance of the proposed method. The proposed method is successively applied to a realistic system of the 18-buses Azerbaijan regional electric network, which is located in the northwest of Iran, and the results are extensively analyzed. The results evaluation reveals that the generators with high capacity operated in full capacity almost the whole of the planning period, because the generation cost coefficients is decreased as the generator capacity increased and vice versa. © 2010 Elsevier Ltd. All rights reserved.

关键词： Genetic algorithms

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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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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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Passivity-Based control of PEM Fuel Cell/Battery Hybrid power Source

Passivity-Based Control of PEM Fuel Cell/Battery Hybrid Powe...

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2011 IEEE Energy Conversion Congress and Exposition (ECCE 2011)

作者： Ali Tofighi Mohsen Kalantar Center of Excellence for Power System Automation and Operation Department of Electrical Engineering Iran University of Science and Technology Tehran Iran

ISBN: (纸本)9781457705427

In this paper, a DC hybrid power source composed of PEM fuel cell as main source, Li-ion battery storage as transient power source and their power electronic interfacing is modelled based on Euler-Lagrange framework. Subsequently, passivity-based controllers are synthesized using the energy shaping and damping injection technique. Local asymptotic stability is insured as well. In addition, the power management system is designed in order to manage power flow between components. Evaluation of the proposed system and simulation of the hybrid system are accomplished using MATLAB/Simulink. The results show that the outputs of hybrid system have good tracking response, low overshoot, short settling time and zero steady-state error.

关键词： Batteries Fuel cells Hybrid power systems Mathematical model DC-DC power converters Equations system-on-a-chip

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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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power Quality Compensation as Well as power Flow control Using of Unified power Quality Conditioner

Power Quality Compensation as Well as Power Flow Control Usi...

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

作者： A. Mokhtatpour H. A. Shayanfar Electrical Engineering Department Science and Research Branch Islamic Azad University Tehran Iran Center of Excellence for Power system Automation and Operation Department of Electrical Engineering Iran University of Science and Technology Tehran Iran

ISBN: (纸本)9781424462537

This paper proposed a new control approach for power quality compensation using Unified power Quality Conditioner (UPQC). This approach has capability of power flow control as well as power quality compensation, too. In the UPQC control, Series Active Filter (SAF) is controlled by dqo approach for voltage sag, swell, unbalance, interruption and harmonic compensation. Also, Parallel Active Filter (PAF) is controlled by composition of dqo and Fourier theories for current harmonic and reactive power compensation. These control strategies have been simulated in MATLAB software and a number of selected simulation results have been shown. The results show the validity of proposed strategy.

关键词： power quality Reactive power power harmonic filters Harmonic analysis Voltage control Active filters

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An improved current control method of shunt active power filter based on state-space variables under asymmetrical and non-sinusoidal conditions

An improved current control method of shunt active power fil...

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International power engineering and Optimization Conference (PEOCO)

作者： M. Asadi A. Jalilian Department of Electrical Engineering Niroo Research Institute (NRI) Iran University of Science and Technology Tehran Iran Department of Electrical Engineering Center of Excellence for Power System Automation of Operation Iran University of Science and Technology Tehran Iran

A control method of a shunt active power filter (SAPF) based on state-space is proposed in this paper. The SAPF is a three-phase inverter employed in four-wire grid. This paper presents switching functions extracted by state-space equations based on the averaged model of the SAPF. The proposed improved control method is appropriate under asymmetrically non-sinusoidal source and non-linear loads. The principles of the presented control method are examined for compensation of the reactive current and the harmonic current components. The proposed control method was simulated and the simulation results are provided to validate effectiveness of the proposed control method.

关键词： Harmonic analysis power harmonic filters Mathematical model Equations Inverters Switches Voltage control

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