List of Articles پایداری سیستم

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  1 - Multi-objective planning in order to manage the quantitative and qualitative effects of optimal utilization of groundwater resources in Shahriar plain
  Nima Salehi shafa Hossein Babazadeh Fayaz Aghayari Ali Saremi
  10.30495/jest.2022.63568.5523
  Background and Objective: Development of agriculture, industry and population growth, the exploitation of groundwater resources has increased and has affected its quality. In order to prevent the occurrence of quantitative and qualitative problems of aquifers, managemen More

  Background and Objective: Development of agriculture, industry and population growth, the exploitation of groundwater resources has increased and has affected its quality. In order to prevent the occurrence of quantitative and qualitative problems of aquifers, management of optimal operation of groundwater resources is essential. Therefore, the purpose of this study is the optimal utilization of groundwater resources and to investigate its quantitative and qualitative effects on the Shahriar plain aquifer. Material and Methodology: Groundwater level changes and its quality from the perspective of index (TDS) in Shahriar plain aquifer have been simulated by ANN. Then (TDS) of groundwater has estimated by regression. Finally, the multi-objective genetic algorithm (NSGA-II) was used for optimal utilization of groundwater resources and with the aim of minimizing groundwater level changes and total dissolved solids of groundwater. Findings: According to the results of the study, the evaluation criteria (RMSE) in three modes of training, testing and validation for groundwater level changes are equal to 1.27e-06, 0.0025 and 0.003, respectively, and for total dissolved solids of groundwater was calculated to be 0.24, 27.64 and 14.608 and the correlation coefficient (R) at the level (0.05) in three situations was significant for both variables. Also, during the study period, the volume of optimal withdrawal from the aquifer has decreased by 29.12 percent and the optimal amount (TDS) of groundwater on average, 120.87 Mg./l, has been calculated less than the estimate of artificial neural network. And Groundwater level has also increased by an average of 9.27 meters per year. Discussion and Conclusion: The results confirm that the proposed simulation-optimization method as an application tool with good performance, low cost and desirable speed can support several effective factors simultaneous with optimal operation policy. It also reduces the quantitative and qualitative problems of the aquifer and cause increases the stability of the groundwater system.   Manuscript profile
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  2 - Improving the Stability of a Power System Including SVC Based on Energy Function Minimization in a Multi-Model Optimal Coordinated Control Structure
  Elaheh Pagard Shahrokh Shojaeian Mohammad Mahdi Rezaei
  10.30486/teeges.2023.1990843.1083
  In this paper, the improvement of low frequency oscillation (LFO) damping in a power system including SVC is investigated. To achieve this goal, a new control strategy has been presented in which the multi-model controller is optimized using the linear optimal controlle More

  In this paper, the improvement of low frequency oscillation (LFO) damping in a power system including SVC is investigated. To achieve this goal, a new control strategy has been presented in which the multi-model controller is optimized using the linear optimal controller (LOC) and the particle swarm algorithm (PSO). The control bank in the multi-model controller includes three LOC controllers that generate optimal signals through the linearization of the nonlinear equations of the system and the minimization of an energy function to be combined by the Bayes recursive algorithm simultaneously to the generator excitation system and SVC. In order to generate an optimal linear signal, Riccati's equation must be solved; Riccati's equation includes two weight matrices Rric and Qric. These matrices elements are optimized by PSO algorithm. The PSO algorithm has calculated the optimal Rric and Qric with two different objective functions of maximizing the eigenvalues and minimizing the area under the speed curve. To evaluate the MMC-LOC-PSO control strategy, the symmetrical three-phase error is applied to the worst bus and the results of these two objective functions are compared. The simulation of the single machine power system has been done by MATLAB. The proposed control strategy, while maintaining stability, also effectively damps the LFOs, in addition, the permanent rotor speed and rotor angle error have also been favorably pushed to zero. Manuscript profile
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  3 - Improving the dynamic stability of power grids including offshore wind farms and equipped with HVDC transmission system using adaptive neural controller
  Abdolkhalegh Hamidi Jamal Beiza Taher Abedinzade Ali Daghigh
  The purpose of this paper is to improve the dynamic stability of power systems equipped with offshore wind farms and HVDC transmission lines. Since wind farms are affected by environmental factors and cannot have a constant production capacity, the effect of wind turbin More

  The purpose of this paper is to improve the dynamic stability of power systems equipped with offshore wind farms and HVDC transmission lines. Since wind farms are affected by environmental factors and cannot have a constant production capacity, the effect of wind turbine and HVDC system on power oscillation mode is investigated and a suitable solution for selecting input-output signals and stabili­zing complementary controller design is proposed. In the proposed method, using the concepts of controllability, observability and decomposition of single values, the best path for the design of the complementary controller is selected among the input-output signals, then the stabilizer controller is designed based on neural networks and to improve frequency Stability-Voltage is used. The simulation results show that the proposed controller performs better than the classical controllers in terms of response speed, settling time, and voltage fluctuations in the presence of disturbances and confirms the performance of the selected control system. Manuscript profile
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  4 - Impact of Type and Impedance Value of Fault Current Limiters on the Transient Stability of the Power System Taking in to Fault Clearing Time
  Mahdi Dehghani Ashkezari Sayed Mahmod Modaresi Modaresi Sayed Amin Saied Tahera Daemi HamidReza Akbari
  In general, the basis of operation of most fault current limiters is to reduce the short-circuit current by adding a large impedance to the system at the time of the fault. However, fault current limiters differ in the type of impedance and how the impedance adds and re More

  In general, the basis of operation of most fault current limiters is to reduce the short-circuit current by adding a large impedance to the system at the time of the fault. However, fault current limiters differ in the type of impedance and how the impedance adds and removes the system. In this paper, taking into account three different locations for installing fault current limiter in a sample power network, as well as changing the type (inductance or resistance) and its impedance value in an extensive range, the effects of these parameters on the stability of the power system have been investigated and analyzed. The criterion used for the first time in this article by the authors to examine and evaluate the transient stability of the power system is the method of the difference between the accelerating and decelerating area. The basis of this method is based on the equal area criterion. Other issues addressed in this paper are presenting a method for locating and determining the optimal value of fault current limiter impedance to improve the stability of the power system. Also, the effect of fault clearing time on transient stability has been studied when the fault current limiter is present in the power grid. Manuscript profile
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  5 - Adaptive Load Shedding Analysis in Power Systems by Using Artificial Neural Network
  Rahmatolah Hooshmand Majid moazzami
  The stability of frequency and voltage is one of the basic principles in the power systems. One of the latest control measures for power system frequency control and stability is load shedding. A fast and optimal adaptive load shedding method using Artificial Neural Net More

  The stability of frequency and voltage is one of the basic principles in the power systems. One of the latest control measures for power system frequency control and stability is load shedding. A fast and optimal adaptive load shedding method using Artificial Neural Networks (ANN) is presented in this paper. In this paper, the total power generation and the total existing load in power system were selected as the ANN inputs. This method has been tested on theNew England test system. The simulation results show the ability of this frequency control algorithm for optimal solving problem related to conventional method. Manuscript profile
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  6 - Effects of Type and Amount of Fault Current Limiter Impedance on Stability of System after Short Cicuit Fault Occurance in Power Network
  سید محمد رضا مدرسی سید محمود مدرسی
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