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دسترسی آزاد مقاله
1 - Load Frequency Control in Power Systems Using Improved Particle Swarm Optimization Algorithm
Milad Babakhani QazijahanThe purpose of load frequency control is to reduce transient oscillation frequencies than its nominal valueand achieve zero steady-state error for it.A common technique used in real applications is to use theproportional integral controller (PI). But this controller has چکیده کاملThe purpose of load frequency control is to reduce transient oscillation frequencies than its nominal valueand achieve zero steady-state error for it.A common technique used in real applications is to use theproportional integral controller (PI). But this controller has a longer settling time and a lot of Extramutation in output response of system so it required that the parameters be adjusted as appropriate . In thispaper, we aim to design a system based on PI controllers using improved particle swarm optimizationalgorithm for load frequency control .Multi-population approach and local search to improve theoptimization algorithms is used and displayed. That this approach will lead to accelerating the achievementof results, preventing entrapment in a local minimum, and get better system output compared with similarmethods. پرونده مقاله -
دسترسی آزاد مقاله
2 - Load frequency control of two-area interconnected power system using fuzzy logic control approach
Iydin Javadi Marand :saeed barghandanPower systems are composed of power units that are constantly connected to each other and the electric power flux is constantly moving between them. All systems must be implemented in such a way that not only under normal conditions but also unwanted inputs or disturban چکیده کاملPower systems are composed of power units that are constantly connected to each other and the electric power flux is constantly moving between them. All systems must be implemented in such a way that not only under normal conditions but also unwanted inputs or disturbances, are applied. It also remains stable or returns to a stable name at the earliest possible time. The fundamental factors of stability control in a power system are the frequency of different areas and the power flux between different areas. Now that the main goals of controlling stability in a system of power are expressed, they must be maintained by designing and implementing controllers of these indicators in their optimal range. In this study, the frequency control function is initially expressed. Subsequently, the design of several additional controller parameters is based on this algorithm and ultimately, by applying additional controllers designed on the simulated power system, the results of the effect of each of them on the faster loss of frequency oscillations will be discussed. پرونده مقاله -
دسترسی آزاد مقاله
3 - Analysis and Simulation of Load Frequency Control in Power System with Reheater Steam Turbine
Mehdi Riahinasab Neda Behzadfar Homa MovahednejadPower systems are a complex system, which to control them in steady state, different control loops are needed. Load changes affect the frequency of electrical networks. Frequency stabilization (FS) is very important due to the increasing penetration of renewable energy چکیده کاملPower systems are a complex system, which to control them in steady state, different control loops are needed. Load changes affect the frequency of electrical networks. Frequency stabilization (FS) is very important due to the increasing penetration of renewable energy sources in power systems. The main task of load frequency control is to keep the system frequency according to the specified nominal value and to maintain the correct amount of exchange power between the control areas. In this paper, load frequency control (LFC) in single-area power system (SIPS) is studied and simulated. Each area has a steam generating unit with a reheat steam turbine. The system equations are expressed in the state space and the system model is determined based on the transfer function. The simulation results have been obtained using Matlab software. The simulation results show the effect of reheater's parameters on the transient dynamic behavior of the system. پرونده مقاله -
دسترسی آزاد مقاله
4 - کنترل بار-فرکانس در یک ریزشبکه AC با استفاده از کنترلکننده فازی PID خودتنظیم و با در نظر گرفتن تاخیر در ورودی
روح الله شاهدی کامل صباحی مهدی توان امین حاجی زادهدر یک سیستم ریزشبکه، اغلب منابع تولید پراکنده از جمله پیل سوختی، انرژی خورشیدی دارای ماهیت غیرخطی و متغیر با زمان میباشند، که مسئله کنترل را در آن با مشکلاتی مواجه میکند. همچنین، با توجه به اینکه در اغلب سیستمهای ریزشبکه کنترلکنندههای فرکانس به صورت متمرکز بوده و چکیده کاملدر یک سیستم ریزشبکه، اغلب منابع تولید پراکنده از جمله پیل سوختی، انرژی خورشیدی دارای ماهیت غیرخطی و متغیر با زمان میباشند، که مسئله کنترل را در آن با مشکلاتی مواجه میکند. همچنین، با توجه به اینکه در اغلب سیستمهای ریزشبکه کنترلکنندههای فرکانس به صورت متمرکز بوده و منابع کنترلشونده در فواصل دوری از اتاق کنترل قرار دارند، بوجود آمدن تاخیرزمانی امری انکارناپذیر است که میبایست در طراحی کنترلکننده مورد توجه قرار گیرد. برای همین منظور و در این مقاله، از کنترلکننده فازی PID خودتنظیم برای کنترل بار-فرکانس در یک سیستم ریزشبکه استفاده شده است. کنترلکننده فازی PID معرفی شده توانایی مناسبی جهت مقابله با غیرخطیگری و تغییر در نقاط کار سیستم را دارد، اما جهت مقابله با تاخیرزمانی در ورودی سیستم، از خاصیت خودتنظیم مشابه با روش زیگلر-نیکولز استفاده شده است. کنترلکننده فازی PID خودتنظیم طراحی شده برای کنترل بار-فرکانس یک سیستم ریزشبکه که در حالت جداشده از شبکه میباشد، اعمال شده و نتایج آن با کنترلکننده فازی PID ساختار ثابت مقایسه شده است. شبیهسازیها به ازای مقادیر مختلف تاخیرزمانی برتری روش پیشنهادی را در مواجهه با تاخیرزمانی و تغییر در بار درخواستی را نشان داده و با کیفیت مناسبی تغییرات فرکانس را به صفر رسانده است. پرونده مقاله -
دسترسی آزاد مقاله
5 - کنترل بار فرکانس در یک سیستم قدرت چند ناحیهای با مشارکت منابع انرژی تجدیدپذیر و خودروی الکتریکی با استفاده از کنترلکننده PID مرتبه کسری مبتنی بر شبکه عصبی موجک
عباسعلی زمانی سید محمد کارگر دهنوی علیرضا رئیسیبا تجدید ساختار سیستم قدرت و ادغام منابع انرژی تجدیدپذیر مختلف با رفتار دینامیکی پیچیده و عدم قطعیتهای عملکردی زیاد، مبحث کنترل بار فرکانس، پیچیدگیهای بیشتری پیدا کرده است. در این مقاله برای یک سیستم قدرت ترکیبی دو ناحیهای که شامل نیروگاه حرارتی با در نظر گرفتن عوامل چکیده کاملبا تجدید ساختار سیستم قدرت و ادغام منابع انرژی تجدیدپذیر مختلف با رفتار دینامیکی پیچیده و عدم قطعیتهای عملکردی زیاد، مبحث کنترل بار فرکانس، پیچیدگیهای بیشتری پیدا کرده است. در این مقاله برای یک سیستم قدرت ترکیبی دو ناحیهای که شامل نیروگاه حرارتی با در نظر گرفتن عوامل غیرخطی مانند باند مرده گاورنر و محدودیت میزان تولید و منابع انرژی تجدیدپذیر شامل توربین بادی، نیروگاه خورشیدی-حرارتی، الکترولایزر، پیل سوختی و خودرو برقی پلاگین است، یک ساختار کنترل بار فرکانس تطبیقی مرتبه کسری، مبتنی بر شبکههای عصبی موجک خود بازگشتی و کنترلکننده مرتبه کسری با نام کنترلکننده تناسبی-انتگرالی-مشتقی (PID) مرتبه کسری مبتنی بر شبکه عصبی موجک (AWNNFOPID) پیشنهاد شده است. برای مقایسه عملکرد کنترلکننده AWNNFOPID پیشنهادی چهار سناریو متفاوت در نظر گرفته شده و نتایج با کنترلکنندههای سنتی انتگرال گیر (I)، متناسب-انتگرال گیر (PI)، PID و همچنین با کنترلکننده PID مرتبه کسری (FOPID) بهینه مقایسه شده است. نتایج شبیهسازیها نشاندهنده عملکرد بسیار مناسب کنترلکننده AWNNFOPID پیشنهادی بر اساس شاخصهای عملکردی زمان نشست، زمان صعود، حداکثر فراجهش، حداکثر فروجهش، انتگرال زمانی قدر مطلق خطا (ITAE) و انتگرال قدر مطلق خطا (IAE) در مقایسه با سایر کنترلکننده به کار رفته برای سیستم قدرت مورد مطالعه است. پرونده مقاله -
دسترسی آزاد مقاله
6 - HVDC Line Model for Load Frequency Control Using Harmony Search Algorithm Application
Mohammadali Shahab Ghazanfar ShahgholianLoad frequency control (LFC) is used as part of automatic generation control (AGC) in power systems. LFC with the automatic voltage regulator (AVR) plays an important role in maintaining the frequency and constant voltage. In this paper, a method for load frequency cont چکیده کاملLoad frequency control (LFC) is used as part of automatic generation control (AGC) in power systems. LFC with the automatic voltage regulator (AVR) plays an important role in maintaining the frequency and constant voltage. In this paper, a method for load frequency control in reconstructed electrical systems using high voltage direct current (HVDC) line is presented. An accurate and complete model based on the control circuit and equations with HVDC controller design is considered and its parameters are optimized using the harmony search algorithm (HAS). To test the method, the power system is simulated with three-area. The simulation results show the proper performance of the power system against sudden load changes and disturbances caused by other areas. پرونده مقاله -
دسترسی آزاد مقاله
7 - Fuzzy PID Tuned by a Multi-Objective Algorithm to Solve Load Frequency Control Problem
Ehsan Tehrani Amir Reza Zare Bidaki Mohsen FarahaniAbstract In this paper, a fuzzy PID with new structure is proposed to solve the load frequency control in interconnected power systems. in this study, a new structure and effective of the fuzzy PID-type Load frequency control (LFC) is proposed to solve the load frequenc چکیده کاملAbstract In this paper, a fuzzy PID with new structure is proposed to solve the load frequency control in interconnected power systems. in this study, a new structure and effective of the fuzzy PID-type Load frequency control (LFC) is proposed to solve the load frequency control in interconnected power systems. The main objective is to eliminate the deviations in the frequency of different areas and tie-line power flow with the minimum settling time. In the structure of fuzzy PID, four gains are adjusted by a multi-objective algorithm. The genetic algorithm (GA) is used to generate the Pareto front. The best compromise solution from the obtained Pareto set is then chosen by a Fuzzy-based approach. In addition, we suggest a new control strategy based on the fuzzy PID for the LFC problem. The simulation results show that the frequency and tie-line power flow deviations are effectively damped and settling time in responses is considerably reduced. پرونده مقاله -
دسترسی آزاد مقاله
8 - Power Frequency Control of the Grid using PMSG-Based Wind Farm Connected by HVDC Link Controlled by a New Method Based on Fuzzy Logic Controller
Ali Mastanabadi Gholamreza Aghajani Davar MirabbasiBy development of the power system in presence of the sustainable energies, the issue of grid frequency control is becoming more important. In traditional power systems, the frequency is mostly controlled by the hydroelectric power plants. This makes it troublesome in c چکیده کاملBy development of the power system in presence of the sustainable energies, the issue of grid frequency control is becoming more important. In traditional power systems, the frequency is mostly controlled by the hydroelectric power plants. This makes it troublesome in cases of dry spell or the absence of the hydro power plants. In this paper, a new method based on using wind farm equipped with PMSG, connected through HVDC link and controlled by fuzzy logic controller, is proposed to investigate the feasibility of using wind farms to improve the frequency control performance. The proposed system is tested on a four area grid and simulated in MATLAB /Simulink. It is concluded that the best performance, which is up to 26% improvement in settling time of the frequency deviation, is achieved by the proposed system in comparison to using the traditional control method and using wind farm controlled by conventional controllers. پرونده مقاله -
دسترسی آزاد مقاله
9 - Improved Dynamic Performance in Interconnected Power System Using Secondary Frequency Control
Bahador Fani Farhad Mesrinejad Somaye Yaghoubi HassanHaes AlhelouLoad changes affect the frequency of electrical networks. Frequency stabilization is very important due to the increasing penetration of renewable energy sources in power systems. Load frequency control (LFC) is used in the power system, so that the frequency of the pro چکیده کاملLoad changes affect the frequency of electrical networks. Frequency stabilization is very important due to the increasing penetration of renewable energy sources in power systems. Load frequency control (LFC) is used in the power system, so that the frequency of the programmed system and the power of the connection line of an interconnected area are within the specified limits. To improve the dynamic performance of the power system and control the frequency stability, LFC is used in power systems. The main task of LFC is to keep the system frequency according to the specified nominal value and to maintain the correct amount of exchange power between the control areas. In this paper, load frequency control in two-area power system is studied and simulated. Each area has a steam generating unit with a reheat steam turbine. The system equations are expressed in the state space and the system model is determined based on the transfer function. The simulation results have been obtained using Matlab software. The simulation results show the effect of Richter's parameters on the transient dynamic behavior of the system. پرونده مقاله -
دسترسی آزاد مقاله
10 - Load Frequency Control in Power Systems Using Multi Objective Genetic Algorithm & Fuzzy Sliding Mode Control
M. Khosraviani M. Jahanshahi M. Farahani A.R. Zare BidakiThis study proposes a combination of a fuzzy sliding mode controller (FSMC) with integral-proportion-Derivative switching surface based superconducting magnetic energy storage (SMES) and PID tuned by a multi-objective optimization algorithm to solve the load frequency c چکیده کاملThis study proposes a combination of a fuzzy sliding mode controller (FSMC) with integral-proportion-Derivative switching surface based superconducting magnetic energy storage (SMES) and PID tuned by a multi-objective optimization algorithm to solve the load frequency control in power systems. The goal of design is to improve the dynamic response of power systems after load demand changes. In the proposed method, an adaptive fuzzy controller is utilized to mimic a feedback linearization control law. To compensate the compensation error between the feedback linearization and adaptive fuzzy controller, a hitting controller is developed. The Lyapunov stability theory is used to obtain an adaption law so that the closed-loop system stability can be guaranteed. The optimal PID controller problem is formulated into a multi-objective optimization problem. A Pareto set of global optimal solutions to the given multi-objective optimization problem is generated by a genetic algorithm (GA)-based solution technique. The best compromise solution from the generated Pareto solution set is selected by using a fuzzy-based membership value assignment method. Simulations are presented and compared with conventional PID controller and another new controller. These results demonstrate that the proposed controller confirms better disturbance rejection, keeps the control quality in the wider operating range, reduces the frequency’s transient response avoiding the overshoot and is more robust to uncertainties in the system. پرونده مقاله -
دسترسی آزاد مقاله
11 - Secondary frequency control for improved dynamic performance in interconnected power system
Farhad Mesrinejad Somaye Yaghoubi Bahador FaniLoad changes affect the frequency of electrical networks. Frequency stabilization is very important due to the increasing penetration of renewable energy sources in power systems. The main task of load frequency control is to keep the system frequency according to the s چکیده کاملLoad changes affect the frequency of electrical networks. Frequency stabilization is very important due to the increasing penetration of renewable energy sources in power systems. The main task of load frequency control is to keep the system frequency according to the specified nominal value and to maintain the correct amount of exchange power between the control areas. Load frequency control in two-area power system is studied and simulated in this paper. Each area has a steam generating unit with a reheat steam turbine. The system equations are expressed in the state space and the system model is determined based on the transfer function. The simulation results have been obtained using Matlab software. The simulation results show the effect of reheater on the transient dynamic behavior of the two-area power system. پرونده مقاله