نتایج جستجو برای: کنترل فرکانس بار lfc

تعداد نتایج: 128495  

2014
K. P. Singh Parmar

This article presents a Particle Swarm Optimization with timevarying acceleration coefficients (TVAC-PSO) technique for the design of Integral (I) controller for the Load Frequency Control (LFC) system. The LFC modeling is carried out for Multi-area interconnected power systems (MAIPS). The power system comprises non-reheat thermal unit in each control area. The controller gains have been optim...

2015
Homayoun Ebrahimian Hassan Manafi Mehran Salavati

Objective: A Modified Shuffled Frog Leaping (MSFL) algorithm based Multi-stage Fuzzy (MSF) PID controller is proposed in this paper to solve the Load Frequency Control (LFC) problem in a deregulated environment. The power system LFC problems are caused by small load perturbations which continuously disturb the normal operation of power system. The objectives of LFC are to minimize the transient...

2014
Shawna E. Doerksen Edward McAuley

Many adults have poor dietary habits and few studies have focused on mechanisms underlying these behaviors. This study examined psychosocial determinants of dietary behavior change in university employes across a 5-month period. Participants completed measures of fruit and vegetable consumption (FVC) and low fat food consumption (LFC) and social cognitive constructs. Multiple regression analyse...

2014
K. P. Singh Parmar H. Shayeghi H. A. Shayanfar

This paper presents the Load frequency control (LFC) of a multi-source power system with Redox flow batteries (RFB). The power system comprises non-reheat thermal, hydro and gas generating units. RFB is integrated to the LFC system to improve the dynamic responses. The proportional plus integral (PI) controller is designed using the PSO technique. Dynamic responses are obtained by giving 1% ste...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده مهندسی برق و کامپیوتر 1390

در این پایان نامه، مطالعه کنترل فرکانس در ریز شبکه های قدرت در حالت جدا از شبکه مورد بررسی قرار می گیرد. امروزه با افزایش روز افزون نیروگاههای بادی در ریزشبکه ها و کاهش استفاده از ژنراتور های متداول سنکرون، اینرسی ریزشبکه ها کاهش خواهد یافت. در این تحقیق یک کنترلر فازی پیشنهاد شده است که با بهره گیری از ویژگیهای ژنراتور بادی دو سو تغذیه یک اینرسی مجازی ایجاد مینماید که قادر است در کنترل فرکانس ...

ژورنال: :مهندسی و مدیریت انرژی 0
حسین شایقی اردبیل بهروز صبحانی اردبیل

بیشتر تولیدهای پراکنده در شرایط اتصال به شبکه، با استفاده از واسطه های الکترونیک قدرت کنترل می شوند. در این شرایط، چون ولتاژ و فرکانس شبکه باعث تثبیت ولتاژ و فرکانس سمت تولید پراکنده می شود، به منظور کنترل بر روی توان اکتیو و راکتیو خروجی از کنترل کنندۀ جریانی استفاده می شود. یکی از چالش های اساسی برای این تولیدها شرایط جزیره ای است. طبق استانداردهای موجود، شرایط جزیره ای باید در زمان کمتر از 2...

Journal: :hepatitis monthly 0
raika jamali student scientific research center, tehran university of medical sciences, tehran, ir iran alireza mofid internal medicine ward, sina hospital, tehran university of medical sciences, tehran, ir iran homayoon vahedi digestive disease research institute, tehran university of medical sciences, tehran, ir iran rojin farzaneh internal medicine ward, sina hospital, tehran university of medical sciences, tehran, ir iran shahab dowlatshahi internal medicine ward, sina hospital, tehran university of medical sciences, tehran, ir iran; internal medicine ward, sina hospital, tehran university of medical sciences, tehran, ir iran. tel: +98-2163120000, fax: +98-2166348553

conclusions it seems that hp eradication per se might not affect lfc, lft, lipid profile, and insulin resistance in dyspeptic nafld patients. results one hundred (49 males) patients with the mean age of 43.46 (± 11.52) were studied. repeated measure anova showed a significant reduction in lfc, anthropometric measurements, and laboratory parameters (except for hdl) in the both groups during the ...

ژورنال: محاسبات نرم 2013

In this paper, considering variant power system parameters and using Imperialist Competitive Algorithm (ICA) and ITAE (Integral Time Absolute Error) criterion we deal with tuning optimal parameter of load frequency PID controller in two-area power systems. To attain the desirable robust performance, selecting the appropriate objective function is important. The obtained simulation results indic...

1997
Vladimir B. Bajić

This paper presents in a systematic way problems encountered in the construction of Lyapunov function candidates for descriptor systems. The solutions to some of the major difficulties in the application of Lyapunov’s direct method to descriptor systems are presented. Some new results regarding the extension of Lyapunov’s direct method tied to the construction of the Lyapunov functions are give...

جاویدی دشت بیاض, محمدحسین, عبادی, جعفر,

Maintaining desired megawatt output of a generator unit is an essential role of Automatic Load-Frequency Control (ALFC) loop for secure operation of power system. In modeling this control loop, a major part concerns with the modeling of the mechanical behavior of turbine-generator. While, the efficiency of turbines normally depends on the speed they are operated, in most studies it is not inclu...

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