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نویسنده :هادی
تاریخ:1396/04/14-04:36

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سال انتشار 2009 b1:کد مقاله

:عنوان مقاله

Optimum Siting and Sizing of Distributed
Generations in Radial and Networked Systems

:چکیده

Abstract This article presents a genetic algorithm-based method to determine optimal location and size of the distributed generations to be placed in radial, as well as networked, systems with an objective to minimize the power loss. Several simulation studies have been conducted on radial feeders, as well as networked systems, considering single-distributed generation and multiple-distributed generations separately to minimize the power loss of the system subjected to no voltage violation at any of the buses. Simulation results are given, and the results are compared with the results of Wang and Hashem Nehrir [“Analytical approaches for optimal placement of distributed generation sources in power systems,” IEEE Trans. Power Syst., Vol. 19, No. 4, pp. 2068–2076, November 2004] and Gozel et al. [“Optimal placement and sizing of distributed generation on radial feeder with different static load model,” Proc. of IEEE International Conference on Future Power  Systems (EPS 2005), pp. 1–6, Amsterdam, The Netherlands, 16–18 November 2005] to verify the proposed method.

Keywords :genetic algorithm, distributed generation, optimal location, optimal size, power loss, distribution networks

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سال انتشار 2010 b2:کد مقاله

:عنوان مقاله

Placement of DG with Stochastic Generation

:چکیده

Abstract—1 Due to environmental concerns2interests in using
renewable based distributed generation (DG) have been
increased. Because stochastic nature of renewable energy
resources such as wind speed and solar radiation, their effects on
power system are different from dispachable distributed
generation. In this paper, a method for distribution system
planning and development is presented in presence of distributed
generation with consideration of uncertainties. These
uncertainties consist of uncertainties in power generation, failure
rates and repair times of equipments as well as uncertainties in
electricity market price. The proposed approach is based on
optimization model including power loss reduction and
reliability improvement. Stochastic generation of renewable DG
is modeled by Monte Carlo Simulation (MCS). Uncertainties in
failure rates, repair times and electricity price are calculated
using fuzzy theory concepts. Also objective values are calculated
in Monte Carlo Simulation and optimization is done by genetic
algorithm (GA).
Index Terms—Distributed generation, Renewable energy,
Uncertainty, Risk, Loss, Reliability.

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کد مقاله: b3

سال انتشار 2013 

عنوان مقاله:

Oscillation Damping of a Distributed Generator Using a Virtual Synchronous Generator

میرایی نوسانی ژنراتور توزیع توسط ژنراتور سنکرون مجازی

چکیده:

Abstract—These days, distributed generators (DGs), such as
photovoltaic, wind turbine, and gas cogeneration systems have attractedmore
attention than in the past. DGs are often connected to
a grid by power inverters. The inverters used in DGs are generally
controlled by a phase-locked loop (PLL) in order to be synchronized
with the grid. In a stability point of view, the power system
will be significantly affected if the capacity of inverter-based DGs
becomes larger and larger. The concept of the virtual synchronous
generator (VSG), which is used to control inverters to behave like
a real synchronous generator, can be considered as a solution. The
VSG can produce virtual inertia from energy storage during a
short operation time, and the active power can be produced by a
VSG similar to a synchronous generator. In this paper, an oscillation
damping approach is developed for a DG using the VSG. The
method is confirmed analytically, and verified through computer
simulations. Finally, some laboratory experiments are conducted
using 10-kW inverters and a transmission-line simulator.
Index Terms—Active power control, oscillation reduction, reactive
power control, swing equation, virtual synchronous generator.

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کد مقاله: b4

سال انتشار 2013

موضوعات مقاله شبکه هوشمند، بهره برداری سیستم های قدرت، بازار برق، ریزشبکه یا میکروگرید، توزیع بهینه، تولید پراکنده، برنامه ریزی کوتاه مدت، برنامه پاسخگویی بار، مدیریت انرژی ، برنامه ریزی توان ، انرژی های نو، هاب انرژی، خانه هوشمند، انرژی خانگی، تجدید ساختار سیستم های قدرت است.

عنوان مقاله:

An Optimal Power Scheduling Method for Demand Response in Home Energy Management System

یک روش برنامه ریزی توان بهینه برای پاسخ گویی بار در سیستم مدیریت انرژی خانگی

چکیده:

Abstract—With the development of smart grid, residents have
the opportunity to schedule their power usage in the home by
themselves for the purpose of reducing electricity expense and
alleviating the power peak-to-average ratio (PAR). In this paper,
we first introduce a general architecture of energy management
system (EMS) in a home area network (HAN) based on the smart
grid and then propose an efficient scheduling method for home
power usage. The home gateway (HG) receives the demand response
(DR) information indicating the real-time electricity price
that is transferred to an energy management controller (EMC).
With the DR, the EMC achieves an optimal power scheduling
scheme that can be delivered to each electric appliance by the HG.
Accordingly, all appliances in the home operate automatically in
themost cost-effective way. When only the real-time pricing (RTP)
model is adopted, there is the possibility that most appliances
would operate during the time with the lowest electricity price,
and this may damage the entire electricity system due to the high
PAR. In our research, we combine RTP with the inclining block
rate (IBR) model. By adopting this combined pricing model, our
proposed power scheduling method would effectively reduce both
the electricity cost and PAR, thereby, strengthening the stability of
the entire electricity system. Because these kinds of optimization
problems are usually nonlinear, we use a genetic algorithm to solve
this problem.
Index Terms—Demand response, energy management system,
genetic algorithm, inclining block rate, real-time pricing, smart
grid.

Zhuang Zhao, Won Cheol Lee, Member, IEEE, Yoan Shin, Senior Member, IEEE, and Kyung-Bin Song

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کد مقاله: b5

سال انتشار 2012 

موضوعات مقاله ماشین های الکتریکی، موتورهای خطی، بردار فضایی و مدولاسیون است

عنوان مقاله:

Vector controlled PMLSM using simplified Space vector pulse width modulation

کنترل شده بردار توسط مدولاسیون پنهای پالس بردار فضایی PMLSM

چکیده:

ABSTRACT
This paper aims to develop vector controlled permanent magnet linear synchronous motor (PMLSM) based on simplified space vector pulse width modulation. Mathematical models of PMLSM&SVPWM presented. The present PWM technique does not involve any sector identification and considerably reduces the computation time when compared to conventional space vector PWM technique. To validate the proposed algorithm, simulation
studies have been carried out on vector controlled PMLSM drive. A comparison between Scalar control and vector control approach of PMLSM drive will be provided and verified on MATLAB.
Keywords: offset time, PMLSM, SVPWM, scalar control
vector control.

K. Divakar1, N. Ravisankar Reddy2 .
1M.tech student, G. Pulla Reddy Engineering College, Andhra Pradesh, India
2E.E.E Department, G. Pulla Reddy Engineering College, Andhra Pradesh, India

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کد مقاله: b6

سال انتشار 2011 

موضوعات مقاله عایق ها و فشار قوی، خطوط انتقال هوایی، مقره و تکنولوژی فشار قوی است

عنوان مقاله:

Simulation of overhead transmission line insulators under desert environments

شبیه سازی مقره های خط انتقال تحت محیط صحرا

چکیده

 تا امروز جرقه به دلیل آلودگی مقره خطوط انتقال هوایی، عامل اصلی مشکلات در سیستم انتقال انرژی است . اهمیت این مساله را می توان از آمار ناشی از ارزیابی خطاهای خطوط انتقال به دست آورد. در مصر به عنوان مثال 82 درصد از کل خطاهای انتقال و توزیع به دلیل آلودگی هستند. این مقاله با تست های آزمایشگاهی ، بر روی مقره های آلوده در محیط های بیابانی شبیه سازی شده می پردازد. در این تحقیق تاثیر تغییرات هدایت لایه آلوده توسط شبیه سازی لایه نمک بر روی مقره ها در ولتاژ جرقه پرداخته است . در این پروژه اثر تغییرات رسانای لایه آلوده در طول زمان مورد لازم برای تشکیل شبنم در جرقه نیز مورد بررسی قرار می گیرد. همچنین این پژوهش بدترین دوره پس از تشکیل شبنم را که در آن احتمال وقوع  جرقه افزایش میابد را نشان می دهد.

Abstract

Till today, flashover because of pollution of insulators of overhead transmission lines (OHTL) is a major source of trouble in the electrical power transmission system. The importance of this problem can be assessed from fault statistics of high-voltage transmission lines. In Egypt, for example, about 82% of the total faults of transmission and distribution OHTL are because of pollution. This study deals with laboratory tests, which have been carried out on polluted insulators of the OHTL that simulate desert environments. In this study, the effect of the variation of conductivity of the polluted layer by
means of equivalent salt deposit density on flashover voltage (FOV) is investigated. The effect of variation of conductivity of the polluted, layer along the time required by the procedure needed to form dew, on FOV is also studied. This study is useful for indicating the worst period after the formation of dew, where the probability of flashover is increased.

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کد مقاله: b7

سال انتشار 2012

موضوعات مقاله عایق ها و فشار قوی، مکانیزم تخلیه جزیی، دشارژ جزئی و مواد دی الکتریک جامد است

عنوان مقاله:

Modeling of Partial Discharge Mechanisms in Solid Dielectric Material

مدل‌سازی مکانیزم تخلیه جزیی در ماده دی‌الکتریک جامد

چکیده:

تخلیه جزیی(PD) نمایانگر یک پدیده فیزیکی است که در آن تخلیه در مناطق الکتریکی ضعیف از مواد عایق جامد (عمدتاً در اجزاء گازی یا مایع) دخالت دارند. آن‌ها باعث آسیب رساندن به عایق می‌شوند و اغلب در حفره‌های محصور و یا در نقص‌های پیوند شروع می‌شوند. به دوره‌ای که در آن عایق هنوز هم در شرایط عملیاتی خوب قرار دارد علاقه زیاد عملی است. اثر تخلیه جزیی همچنین در شکست دی‌الکتریک خیلی قبل‌تر از زمان عمر مورد انتظار نمایانگر است. این پروژه با شبیه‌سازی‌هایی از یک مدار معادل تخلیه جزیی تعمیم‌یافته به‌منظور فهمیدن مشخصات تخلیه جزیی در ماده دی‌الکتریک جامد انجام‌شده است. در این پروژه، مکانیزم تخلیه جزیی در ماده دی‌الکتریک جامد به‌وسیله محیط شبیه‌سازی متلب  مدل‌سازی شده است. تمرکز این پروژه بر نتایج تخلیه جزیی در ماده دی‌الکتریک با یک تک حفره به‌عنوان نقص است. منبع AC با فرکانس ولتاژ Hz50 اعمال‌شده است. مشاهده‌شده است که جریان تخلیه با ولتاژ ورودی متناسب است. دامنه تخلیه جزیی برای ورودی Kv10 نصف ورودی Kv20 و یک‌سوم ورودی Kv 30 است. همه جریان‌های تخلیه و ولتاژهای تخلیه در نانوثانیه اتفاق می‌افتد

کلمات کلیدی ــــ تخلیه جزیی، مدار معادل تخلیه جزیی تعمیم‌یافته، مدل‌سازی تخلیه جزیی، دی‌الکتریک جامد

Abstract

 Partial discharge (PD) represents a physical phenomenon, in which discharges are involved in electrically weak regions of solid insulation materials (mostly within gaseous or liquid inclusions). They cause damage to the insulation and often start from the enclosed voids and/or at interface defects. The period in which the insulation is still in good operating condition is of great practical interest. The effect of PD also results in failure of the dielectric much before the expected life-time. This project was conducted by simulations based on an extended PD equivalent circuit in order to
understand the characteristics of PD in solid dielectric materials. In this project, PD mechanism in solid dielectric material was modeled using Simulink in MATLAB®. This project focused on the results of the partial discharges in solid dielectric with a single cavity as defect. AC source with 50Hz frequency voltage was applied. It is observed that the discharge current is proportional with the input voltage. The discharge current amplitude for input 10 kV is half the input of 20 kV and a third of 30 kV input. All discharge currents and discharge voltages occur in nano-seconds.
Index Terms—Partial Discharge, Extended PD Equivalent Circuit, Modeling of Partial Discharge, Solid Dielectric.

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