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

共 127 条记录，以下是41-50 订阅

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A control method for integrating hybrid power source into an islanded microgrid through CHB multilevel inverter

A control method for integrating hybrid power source into an...

引用

power Electronic and Drive systems and Technologies Conference (PEDSTC)

作者： A. Ghazanfari M. Hamzeh H. Mokhtari The Center of Excellence in Power System Management & Control Sharif University of Technology Tehran Iran

This paper proposes a control strategy for an islanded microgrid to effectively coordinate hybrid power source (HPS) units and to robustly control individual interfaced inverters under unbalanced and nonlinear load conditions. Cascaded H-bridge (CHB) multilevel inverters are flexibly deployed in order to enhance the power quality and redundancy. The HPS employs fuel cell (FC) as the main and supercapacitors (SC) as complementary power sources. Fast transient response; high performance; and high power density are the main characteristics of the proposed HPS system. The presented control strategy consists of a power management strategy for the HPS units and a voltage control strategy for the CHB multilevel inverter. A multi proportional resonant (multi-PR) controller is employed to regulate the load voltage at unbalanced and nonlinear load conditions. The proposed multi-PR controller includes a fundamental voltage controller with harmonic compensators. Digital time-domain simulation studies in the PSCAD/EMTDC environment are given to verify the overall proposed system performance.

关键词： Microgrids Inverters Voltage control Load modeling Transient analysis Generators Phase modulation

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A neural network-based model for wind farm output in probabilistic studies of power systems

A neural network-based model for wind farm output in probabi...

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iranian Conference on Electrical Engineering (ICEE)

作者： S. Riahinia A. Abbaspour M. Fotuhi-Firuzabad M. Moeini-Aghtaie Center of Excellence in Power System Management & Control Sharif University of Technology Tehran Iran

ISBN: (纸本)9781467356329

The penetration of wind energy in power systems has been growing due to its interminable and mild environmental effects. The intrinsic attributes of this environmentally-friendly energy, i.e., the stochastic nature of wind farms generation, however, imposes various technical and financial challenges into power systems. So, developing an accurate wind farm modeling approach aimed at taking into account the wind generation intermittency can relieve many of these challenges. Therefore, this paper takes a step to an efficient wind farm modeling procedure employing an accurate as well as well-known Neural Network (NN)-based tool. The proposed approach is comprised of two main steps. The wind speed is predicted in the first step by the time-series NN method. It then continues in the second step with extracting the predicted wind farm outputs and representing the wind farms generation via a multistate model. To this end, an efficient clustering method, i.e., the Fuzzy c-means Clustering Method (FCM) is employed to find the optimal states. Having applied the proposed approach on the case studies, it will confirm that the proposed analytical multistate model can efficiently consider the wind farms output uncertainties in various studies like the conventional units with less computational burden.

关键词： Wind speed Wind farms Wind turbines Artificial neural networks Analytical models Forecasting Predictive models

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Stabilization of DC microgrids with constant-power loads by an active damping method

Stabilization of DC microgrids with constant-power loads by ...

引用

power Electronic and Drive systems and Technologies Conference (PEDSTC)

作者： M. Ashourloo A. Khorsandi H. Mokhtari The Center of Excellence in Power System Management & Control Sharif University of Technology Tehran Iran

High penetration of constant-power loads (CPL) in dc microgrids may cause a destabilizing effect on the system that can lead to severe voltage oscillations. This paper addresses stability problems of the CPLs and proposes a simple active damping technique to damp the oscillations caused by CPLs. The particle swarm optimization algorithm has been used to find the best values of the parameters of the proposed active damper to achieve maximum damping of the oscillations. The effectiveness of the proposed approach is verified by simulations.

关键词： Antenna measurements Stability analysis Optimization MATLAB

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A new algorithm for optimal measurement placement, observability analysis and Harmonic State Estimation in power systems

A new algorithm for optimal measurement placement, observabi...

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power Electronic and Drive systems and Technologies Conference (PEDSTC)

作者： Marjan Shafiee Rad Hossein Mokhtari Houshang Karimi Center of Excellence in Power System Management and Control (CEPSMC) Sharif University of Technology Tehran Iran

Harmonic State Estimation (HSE) is a technique for identifying harmonic distributions in power systems with limited measurements. The main problem in HSE is the optimal placement of measurement meters such that the estimation error is minimized, while making the system fully observable. The second issue is the HSE method. This method must be accurate and fast enough in order to have an accurate HSE. This paper presents a new algorithm that uses minimum variance criterion (MVC) and a sequential method for optimal meters placement, SVD method for observability analysis and finally WLS method for harmonic estimation. The proposed method minimizes the number of measurement devices and the error of estimation at the same time and also makes the system fully observable. The proposed algorithm is tested on Mazandaran transmission network, iran.

关键词： power measurement Current measurement Voltage measurement Measurement uncertainty Time measurement Observability power systems

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Reliability Evaluation of a Composite power system Containing Wind and Solar Generation

Reliability Evaluation of a Composite Power System Containin...

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IEEE International power Engineering and Optimization Conference

作者： Amir Ghaedi Ali Abbaspour Mahmud Fotuhi-Firuzabad Moein Moeini-Aghtaie Muhammad Othman Center of Excellence in Power System Management and Control Sharif University of Technology Faculty of Electrical Engineering Universiti Teknologi MARA

ISBN: (纸本)9781467350723

Variability and uncertainty of wind and photovoltaic (PV) generations greatly influence technical and financial aspects of power systems. This paper examines the potential impacts of large-scale wind and PV farms on reliability level of composite generation and transmission systems. At first, reliability models of renewable-based units are developed. In these models, both component failure rates and uncertainty nature of renewable resources are taken into account. Using the proposed technique, the multi-state analytical models of a wind farm placed in Manjil and a PV farm placed in Jask both in iran are extracted. Then, reliability studies of high renewable-energies penetrated power system at Hierarchical Level II (HLII) based on the state enumeration method taking into account the multi-state models of renewable-based units are completely addressed. The proposed technique is then applied to two well-known modified test systems, i.e. (RBTS and IEEE-RTS) and different reliability indices are calculated. The obtained results well confirms the proposed method simplicity and accuracy.

关键词： Composite Reliability Evaluation Fuzzy Clustering Photovoltaic Farm Reliability Wind Farm

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Fast Short Circuit power Switch Fault detection in Cascaded H-Bridge Multilevel Converter

Fast Short Circuit Power Switch Fault detection in Cascaded ...

引用

IEEE power and Energy Society General Meeting

作者： Mahmoud Shahbazi Mohammad Reza Zolghadri Philippe Poure Shahrokh Saadate Center of Excellence in Power System Management & Control (CEPSMC) Sharif University of Technology Tehran Iran Laboratoire d'Instrumentation Electronique de Nancy LIEN Université de Lorraine France

ISBN: (纸本)9781479913022

Multilevel converters are being widely used in a large number of power electronics applications. Due to the increased number of switching devices, they are more likely to have faults in their switches than the conventional converters. In order to have a balanced operation after a short circuit power switch fault occurrence, it is necessary to detect the fault location. In this paper, a fast power switch fault detection method is presented to identify the fault location. This method only needs one additional voltage sensor per phase, and is faster compared to most of the existing methods. Also it is easy for implementation on a FPGA chip. The proposed method is verified by computer simulations.

关键词： power switch fault detection short circuit fault multilevel converter cascaded H-bridge converter multistage converter Fault location Short circuits power Switch balanced operation Defect detection H-bridge Fasting power electronics

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Improving Direct Load control Implementation by an Inititative Load control Method

Improving Direct Load Control Implementation by an Inititati...

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Conference on Electrical power Distribution Networks

作者： Mohammad Rastegar Mahmud Fotuhi-Firuzabad Moein Moeini-Aghtaie Center of Excellence in Power System Management and Control Department of Electrical Engineering Sharif University of Technology Tehran Iran

ISBN: (纸本)9781479900923

Demand response (DR) as a state-of-the-art program is accommodated in the energy efficiency contexts of the smart grid. Lack of the customer knowledge about how to respond to the time-differentiated tariffs and offered controlling signals is the major obstacle in the way of broad DR implementing. As a solution, an optimization method, namely load control (LC), is proposed to automatically control the on/off status of the responsive appliances in a smart home. This paper focuses on the direct load control (DLC) program in the category of incentive-based DR programs. LC is extended to consider inconvenience cost of the DLC implementation for DLC program participants. Outputs of the extended LC would be an advice for the customer to determine whether it is financially profitable to participate in the offered DLC program or not. Numerical studies are effectuated to investigate different features of the LC and DLC program.

关键词： Direct load control demand response load control smart grid

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power management strategy for a multi-hybrid fuel cell/energy storage power generation systems

Power management strategy for a multi-hybrid fuel cell/energ...

引用

2012 3rd power Electronics, Drive systems and Technologies Conference, PEDSTC 2012

作者： Ghazanfari, A. Hamzeh, M. Mokhtari, H. Center of Excellence in Power System Management and Control Sharif University of Technology Tehran Iran

ISBN: (纸本)9781467301114

This paper depicts a new configuration for modular hybrid power conversion systems, namely, multi-hybrid generation system (MHGS), and parallel connection at the output, such that the converter of each unit shares the load current equally. This is a significant step towards realizing a modular power conversion system architecture, where smaller units can be connected in any series/parallel grouping to realize any required unit specifications. The supercapacitor (SC) as a complementary source is used to compensate for the slow transient response of the fuel cell (FC) as a main power source. It assists the FC to meet the grid power demand in order to achieve a better performance and dynamic behavior. Reliable control of the proposed MHGS with multiple units is also a challenging issue. In this paper, a simple control method to achieve active sharing of load current among MHGS modules is proposed. The simulation results verify the performance of the proposed structure and control scheme. © 2012 IEEE.

关键词： Supercapacitor

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A reliability-oriented outlook on the critical components of power distribution systems

A reliability-oriented outlook on the critical components of...

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9th IET International Conference on Advances in power system control, Operation and management, APSCOM 2012

作者： Dehghanian, Payman Fotuhi-Firuzabad, Mahmud Center of Excellence in Power System Management and Control Sharif University of Technology Tehran Iran

ISBN: (纸本)9781849197434

Critical components of a system denote to those which have considerable influences on its both technical and economical performance. This paper is concentrated on the identification of critical components in power distribution systems, more from a reliability viewpoint, to be planned for maintenance schedules. A new straightforward scheme is proposed based on the common load point reliability indices which can easily get through the components prioritization. The presented scheme can then mathematically find the most critical ones to be put under reliability centered maintenance (RCM). Since the maintenance plans are then applied where necessary, the proposed method helps in more effectively reaching the benchmarked reliability indices of a distribution utility, with the minimum costs and the maximum benefits. The effectiveness and applicability of the offered scheme are finally reflected in its application on a real distribution system, i.e. Swedish distribution network belonging to the BIRKA Nat distribution system in the Stockholm City area.

关键词： Reliability

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Impacts of controlled and uncontrolled PHEV charging on distribution systems

Impacts of controlled and uncontrolled PHEV charging on dist...

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9th IET International Conference on Advances in power system control, Operation and management, APSCOM 2012

作者： Shafiee, Soroush Fotuhi-Firuzabad, Mahmud Rastegar, Mohammad Center of Excellence in Power System Management and Control Department of Electrical Engineering Sharif University of Technology Tehran Iran

ISBN: (纸本)9781849197434

Plug-in hybrid electric vehicle (PHEV) technology provides one of the most promising solutions to tackle the threatening challenges such as air pollution in urban areas. Dramatic increases in the number of PHEVs could have major impacts on power system operations because of their high electricity demand. From the distribution system operator facet, distribution system congestion during PHEVs charging is an economic and security concern. It is, therefore, necessary to investigate the effects of widespread using of PHEVs on the performance of distribution networks. In this paper, PHEV characteristics are exactly studied and a comprehensive model for investigation of PHEV impacts is achieved. The results would likely demonstrate distribution congestion arising from using PHEVs. controlled charging of PHEVs is a possible solution to the distribution congestion problem. In this work, optimal charging algorithm is developed which minimizes the electrical charging payment of customers. The optimization problem is solved by energy schedulers in each home. The output of the problem is the charging level for PHEVs in each period of the scheduling time. Results illustrate that due to noticeable likeness between the load behavior and tariffs, minimizing customer cost would likely lead to shave peak load and prevent distribution congestion.

关键词： Plug-in hybrid vehicles

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