توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Lead\Lag SSSC Based Controller for Stabilization of Frequency Oscillations in Multi–Area Power System
نویسنده(ها): ،
اطلاعات انتشار: بیستمین کنفرانس بین المللی برق، سال
تعداد صفحات: ۹
This paper proposes a new application of Static Synchronous Series Compensator (SSSC) to stabilization of frequency oscillations in a multi–area power system. To stabilize the frequency oscillations, the dynamic power flow control of the Static Synchronous Series Compensator (SSSC) located in series with the tie line between interconnected power systems, is employed. By regarding the system interconnection as a control channel, the power flow control by an SSSC via the interconnection creates a sophisticated method of frequency stabilization. To implement this concept, the robust design method of lead\lag controller equipped with the SSSC is used. SSSC is located in two different areas and the best location for compensation is shown. The technique of overlapping decompositions is applied to reduce the order of the study power
system; meanwhile the physical characteristic is still preserved. Simulation study exhibits the significant effect of designed controller on the study four–area interconnected power system under different load disturbances.<\div>

۲Cost Reduction and Transmission Security Augment in Unit Commitment Using UPFC
نویسنده(ها): ،
اطلاعات انتشار: نوزدهمین کنفرانس بین المللی برق، سال
تعداد صفحات: ۱۰
This paper presents the influence of UPFC to increase transfer capacity and augment transmission security in unit commitment problem. Some effects of using FACTS devices are to increase transmission capability and control power flow. In the overloaded lines, the problem will be solved without UPFC and with UPFC considering transmission constraints. Using Benders decomposition, the formulation is decomposed into a master problem and a subproblem. The master problem without transmission constraints is solved using priority list method. In the case of transmission flow infeasibility, Benders cuts are produced for unit commitment rescheduling. Installation of UPFC reduces cost and considers transmission constraints. Problem formulation, representation and the simulation results for 6 generator in the 26 bus network is tested and influence of UPFC is investigated.<\div>

۳A New Approach for Control of IPFC for Power Flow Management
نویسنده(ها): ،
اطلاعات انتشار: بیست و دومین کنفرانس بین المللی برق، سال
تعداد صفحات: ۸
The Interline Power Flow Controller (IPFC) is one of the Voltage Source Converter (VSC) based FACTS controllers which can
effectively manage the power flow via multiline transmission system. In this paper a new method for control of IPFC, with the aim of managing the power flow in transmission lines, is presented. Simplicity and fast system response are two characteristics of this method. An IPFC with the presented control method is simulated. The results of this simulation demonstrate the success of the method.<\div>

۴A Composite Generation and Transmission Expansion Planning Pinpointing the Optimal Location of Candidate Generating Unit
نویسنده(ها): ، ،
اطلاعات انتشار: بیست و چهارمین کنفرانس بین المللی برق، سال
تعداد صفحات: ۱۳
This paper presents a composite expansion planning (CEP) which considers the impact of candidate generating unit’s location besides the transmission congestion in the course of planning horizon. An efficient Benders decomposition scheme intertwined with a disjunctive formulation is applied to decompose the original CEP problem into a master problem and two sub–problems standing for security and optimal operation. Besides, a sophisticated scheme is applied togain an optimal value for CEP disjunctive parameters. Since the level of congestion is an appropriate criterion to determine the degree of market competitiveness, the proposed model considers a specific term as the congestion cost (CC). The proposed CEP model minimizes the total costs comprising the investment cost as well as the congestion cost. The proposed approach is applied to the northeastern area of the Iranian power grid.<\div>

۵Dynamic Transmission Expansion Planning using Benders Decomposition:A Stochastic Approach
نویسنده(ها): ، ،
اطلاعات انتشار: بیست و چهارمین کنفرانس بین المللی برق، سال
تعداد صفحات: ۱۲
This paper presents a multi–stage stochastic model for short–term transmission expansion planning. Transmission planning studies deal with many uncertainties. Load uncertainty has been considered in this paper. Monte Carlo simulation method has been applied for generating scenarios. Scenario reduction techniques are used for reducing the number of scenarios. The objective function is to minimize the sum of investment costs (IC) and expected operation costs (OC). The solution technique is based on benders decomposition algorithm. Deterministic N–1 contingency criteria have been also considered. The proposed model is applied to the IEEE 24–bus Reliability Test System. The results obtained show the efficiency of the proposed method.<\div>

۶Stochastic Unit Commitment of Wind Farms Based on Mixed–Integer Linear Formulation
نویسنده(ها): ،
اطلاعات انتشار: بیستمین کنفرانس مهندسی برق ایران، سال
تعداد صفحات: ۶
Due to uncertainty of wind velocity, wind power generators don’t have deterministic output power. Utilizing wind power generation and thermal power plants together create newconcerns for operation engineers of power systems. In this paper, a model is presented to implement the uncertainty of load andgenerated wind power which can be utilized in power system operation planning. Stochastic behavior of parameters is simulated by generating scenarios that can be solved bydeterministic method. A mixed–integer linear programming method is used for solving deterministic generation schedulingproblem. The proposed approach is applied to a 12–unit test system including 10 thermal units and 2 wind farms. The resultsshow effectivity of piecewise linear model in unit commitment problems. Also using linear programming causes a considerable reduction in calculation times and guarantees convergence to theglobal optimum. Neglecting the uncertainty of wind velocity causes higher cost assessment of generation scheduling<\div>

۷The Management of Distributed Energy Resources for Voltage Control in Smart Grids
نویسنده(ها): ، ،
اطلاعات انتشار: بیستمین کنفرانس مهندسی برق ایران، سال
تعداد صفحات: ۵
Using the communication infrastructure and management that created in smart grids, end–user reactive power capable devices can be coordinated for voltage support. In smartgrids, Energy Management System (EMS) is responsible for network management. On the other hand, DistributionManagement System (DMS) can be used in very widespread grids to make some of the decisions for network management. In this paper, a new framework for voltage control in distribution feeder based on the decentralize manner has been presented. In this method, the DMS is used for making the decisions and thecentral EMS supervises to the decisions that make by DMS. For this purpose, a three–layer management system is developed andresources are grouped. Consequently, results are implemented in 69–bus distribution network<\div>

۸A Quantitative Analysis of Effects of Transition from AC to DC System, on Loads and Generation
نویسنده(ها): ،
اطلاعات انتشار: کنفرانس فناوری شبکه های الکتریکی هوشمند، سال
تعداد صفحات: ۶
Electrical system mainly generates, transmits and distributes electrical energy through ac voltage for more than a century. But, during the recent decades, some newmodifications in electrical system, like the fast promising growth of renewable sources, storage systems and dc loads, arechanging the circumstances gradually. Considering newlyemerged conditions, it seems necessary to study again the possible roles of dc system in now and future electrical system,i.e. Smart Grid. In this paper, determining the true reasons of the transition, firstly brief history of the transition from ac to dcis mentioned. Also it is investigated whether the reasons are still important and reliable. Then, considering the recent modification in electrical industry, the necessity of new challenge of ac system by dc system is described. Finally, theeffects of the transition from ac to dc, on the two main sectionsof electrical system, i.e. load and generation, have been studied and derived quantitatively.<\div>

۹A Novel Approach for Monitoring of Voltage Stability Margin subsequent to Observability Analysis: A Practical System Case Study
نویسنده(ها): ، ،
اطلاعات انتشار: دومین همایش ملی پژوهش های کاربردی در برق، مکانیک و مکاترونیک، سال
تعداد صفحات: ۸
This paper presents a practical approach for voltage stability margin (VSM) monitoring in a pilot project, in which two related steps are considered. Through the planning stage of a practical project, it is necessary to make the grid observable to actualize the VSM monitoring during the operation. So, an observability based VSM monitoring scheme is proposed in this work. Firstly, using observability analysis and state estimation requirement, optimal location of metering devices is determined for the Hormoz distribution grid as a practical system case study. Secondly, using the information sent by metering devices, the VSM monitoring is evaluated using a transfer function (TF) model during the operation. To assess the performance of the proposed method, it is compared with a case, in which metering infrastructures are connected to the whole of buses. For further simulation, input data combinations of the TF model are varied throughout two different scenarios<\div>
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