List of Articles Ghazanfar Shahgholian

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  1 - Adaptive control of nonlinear time delay systems in the presence of output constraints
  Fatemeh Mohammadzamani Mahnaz Hashemi Ghazanfar Shahgholian
  20.1001.1.23223871.1398.10.40.1.1
  Controlling systems in industrial processes are subject to problems such as the limitation of system signals, the uncertainties of parameters, the time delay and the failure of actuators. The design of the controller, which can satisfy the constraints, counteract and om More

  Controlling systems in industrial processes are subject to problems such as the limitation of system signals, the uncertainties of parameters, the time delay and the failure of actuators. The design of the controller, which can satisfy the constraints, counteract and omit these effects, has attracted much attention.On the other hand, the issue of time delay is so serious and effective, which can make the system unstable and disrupt the process. Many of the devices in the systems, such as sensors and actuators, may be defective. The important thing is that any of the above or even system parameters may be uncertain. Identifying, estimating and fixing the destructive effects of the problems mentioned by the controller of the system.The proposed method of control for nonlinear systems in the presence of an uncertain parameters, delay and faults in actuators. There is no need to limit the parameters, delays, and fault of the actuators. This comparative method is capable of guaranteeing the overall boundary of all closed-loop system signals and the convergence of tracking errors to a small neighborhood around the origin. At the end, the simulation results show the effectiveness of the proposed control method Manuscript profile
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  2 - Coordinated Protection Scheme Based on Virtual Impedance Control for Loop-Based Microgrids
  Hamed Karimi Bahador Fani Ghazanfar Shahgholian
  20.1001.1.23223871.1400.12.2.2.0
  The presence of the inverter distributed generations in the power systems can bring about incoordination in the protection system performance while enjoying various advantages. In this paper, a suitable solution, independent of relay settings, is presented in order to s More

  The presence of the inverter distributed generations in the power systems can bring about incoordination in the protection system performance while enjoying various advantages. In this paper, a suitable solution, independent of relay settings, is presented in order to solve the protection problems of inverter island microgrids with circular arrangement. The presence of distributed inverter generation sources causes a change in the direction and amplitude of the fault current at the microgrid level. This problem is more visible in microgrids with circular arrangement. Therefore, conventional protection schemes that consider a single path and a high fault current level compared to load current may be problematic. An important factor for the proper design of a protective system for microgrids is the contribution of the injecting fault current of the inverter sources. In this paper, a protection strategy based on the inverter control of sources is presented and ordinary overcurrent relays with the same characteristic curve are used. When a short circuit fault occurs in the microgrid, an adaptive current limiting strategy is applied using the virtual impedance loop. In this case, the share of fault current of each source is controlled according to the position of the fault, and sources closer to the fault produce a larger fault current. Therefore, the current passing through the protective equipment is closer to the fault than other equipment in the micro grid. And without the need for making connection between protective equipment, the protective coordination is guaranteed. Manuscript profile
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  3 - Overview of DC-DC Non-Insulated Boost Converters (Structure and Improvement of Main Parameters)
  Omid Sharifiyana Majid Dehghani Ghazanfar Shahgholian Sayyed Mohamad Mehdi Mirtalaee Masoud Jabbari
  20.1001.1.23223871.1400.12.48.6.6
  Abstract: The production of clean electricity is one of the most basic human needs today. Therefore, the use of power plants that use renewable and environmentally friendly fuels (new energy) as their base fuel, has been highly appreciated. However, the output voltage l More

  Abstract: The production of clean electricity is one of the most basic human needs today. Therefore, the use of power plants that use renewable and environmentally friendly fuels (new energy) as their base fuel, has been highly appreciated. However, the output voltage level of local power plants based on new energies is as low as the input voltage of the next floors (inverters, etc.). Therefore, researchers have tried to solve this defect by using DC / DC boost converters. The structures related to these converters are different based on the designer's expectations such as voltage gain, output power, efficiency, input voltage specifications, etc. Boost converters are responsible for increasing the DC voltage by switching and storing energy in their inductor. But the same simple structure can be created with the help of new tricks such as using magnetic coupling, adding passive incremental circuits to the converter structure, creating more complete structures by using several active switches and even combining several structures together to the desired point in terms of voltage gain. On the other hand, with soft switching methods (resonance, snubber, etc.), the efficiency of boost converters is in the acceptable range. In this paper, the types of power plants based on new energy and then boost converters, which are the most basic elements of a power plant based on new energy, it is categorized in terms of incremental structures and applied methods for optimizing these converters, especially in terms of reducing losses and increasing efficiency. Manuscript profile
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  4 - Long-Term Demand Forecasting in Electrical Energy Supply Chain of Espidan Ironstone Industry using Deep Learning and Extreme Learning Machine
  Sepehr Moalem Roya M. Ahari Ghazanfar Shahgholian Majid Moazzami Seyed Mohammad Kazemi
  20.1001.1.23223871.1401.13.49.1.0
  Espidan ironstone industries is one of the most consumed power industries in the electricity supply chain of Isfahan province as the second industrial hub of the country and one of the main suppliers of raw materials in the supply chain of the country's steel industry. More

  Espidan ironstone industries is one of the most consumed power industries in the electricity supply chain of Isfahan province as the second industrial hub of the country and one of the main suppliers of raw materials in the supply chain of the country's steel industry. Planning in a large-scale electricity supply chain, in a space full of uncertainty, is begin with electricity demand forecasting.In this paper, a hybrid long-term demand forecasting method in the electricity supply chain of Isfahan's ironstone industries using a combined data mining method including wavelet transform,deep learning and intensive learning machine is proposed. The used data in this study is according to the recorded information from the electrical energy demand signal of Espidan ironstone industries in a period of 40 months in the form of 24-hours. The data in a part of the study period due to the lack of production of this industry in some hours are interrupted. So that only 40% of the data had a value and the remaining, 60% were zero. This subject led to information deficiencies and increases the forecasting error up to 40% in the first step of the proposed algorithm. By completing the first step of the proposed model with intense learning machine (ELM) the forecasting error is reduced and it was possible to create an improved forecasting model for supervised training. Finally, simulation results are compared with other available approaches such as support vector machine and decision tree. The results show the improvement and reduction of error and a significant increase in the accuracy of the proposed method in long-term demand forecasting in the electricity supply chain of Espidan ironstone industries. Manuscript profile
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  5 - Harmonic Compensation and Micro-Grid Voltage and Frequency Control Based on Power Proportional Distribution with Adaptive Virtual Impedance Method
  Monir Kamali Bahador Fani Ghazanfar Shahgholian Gevork B. Gharehpetian Masoud Shafiee
  20.1001.1.23223871.1402.14.53.3.7
  Due to the different distances and complexity of micro-grids, the lines impedance varies between the feeders of the distributed generation and the loads. Therefore, conventional droop control method does not have good efficiency in power distribution between distributed More

  Due to the different distances and complexity of micro-grids, the lines impedance varies between the feeders of the distributed generation and the loads. Therefore, conventional droop control method does not have good efficiency in power distribution between distributed generation (DG) units. Generally, due to simplification, the impedance of the lines is not considered in a complex. The stated conditions greatly reduce the accuracy and speed of the dynamic response of the control system. In this paper, harmonic compensation, voltage and frequency control of micro-grid with adaptive virtual impedance method based on proportional power distribution are presented. In the proposed method, reducing the error coefficient of active power and reactive power, control of voltage and currents’ harmonic in two modes of connection to the main grid and islanded, as well as voltage and frequency control for optimal operation of the micro-grid is presented. The proposed method, without the need to update the impedance information of the feeders, has the capability of optimal operation and power distribution under different operating conditions, taking into account the complex impedance. To validate, the proposed method is simulated in MATLAB/Simulink software environment and the results are presented along with stability and sensitivity analysis. Manuscript profile
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  6 - A Review of Surge Control and Modeling in Centrifugal Compressors
  Adel Khosravi Abbas Chatraei Ghazanfar Shahgholian Seyed Mohamad Kargar
  20.1001.1.23223871.1401.13.50.1.2
  Compressors are of particular importance due to their wide application in various industries for compression and gas transmission. Due to the increasing use of compressors in the industry, it is imperative to determine a mathematical model for the compressor to design a More

  Compressors are of particular importance due to their wide application in various industries for compression and gas transmission. Due to the increasing use of compressors in the industry, it is imperative to determine a mathematical model for the compressor to design a control system, analyze it and its simulating in corresponding computer software like MATLAB. In recent years, intelligent modeling such as neural and fuzzy networks due to the more realistic performance of these models has been considered by researchers. Its types have been used for modeling. Intelligent methods have a high ability to stablish a relation between input and output data. On the other hand, in compressors surge phenomenon is a challenging case which occurs very quickly and will cause damage to the compressor and the production process. This phenomenon is defined as an instability in the operation of the compressor. Surge control expands the operating range of the compressor and exhibit the occurrence of this phenomenon. This article reviews modeling, surge phenomenon, and types of active and inactive surge control. For modeling, from the Moore–Greitzer’s model to intelligent models, it has been studied that according to the obtained results, it can be said that the Moore–Greitzer’s model has more errors over time than intelligent models and is a suitable model. Not from the compressor. Next, the control of the surge phenomenon in the compressor is checked by active and passive methods. The compressor's control in the active mode does not require a compressor performance curve. Still, in the passive method, it controls the compressor by using the performance curve and creating a safety margin from the surge line. So as not to enter the surge phenomenon. This makes active control performance more efficient than passive control. Manuscript profile
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  7 - Coordination of Protection Equipment in Synchronous Generator-Based Microgrids with Regard to Maintaining First Swing Stability
  Hassan Fayazi Majid Moazzami Bahador Fani Ghazanfar Shahgholian
  20.1001.1.23223871.1402.14.54.2.8
  With the addition of distributed generation resources to the structure of distribution networks, at the time of the fault, the amount and direction of flow through the main and backup protections changes and disrupts the coordination between them. Synchronous generator- More

  With the addition of distributed generation resources to the structure of distribution networks, at the time of the fault, the amount and direction of flow through the main and backup protections changes and disrupts the coordination between them. Synchronous generator-based sources, meanwhile, are more sensitive to error fixing times and their stability may be compromised. Since the troubleshooting time depends on the performance of the protection system, this paper proposes the most suitable protection combination for systems with synchronous generators by examining the types of combinations for protection elements (relay-relay, relay-recloser and recloser-fuse). Slowly On the other hand, this paper presents a solution by which, while maintaining the stability of the first oscillation of synchronous generators in the distribution network, the coordination between the main protection and the backup in the event of an error and in the presence of these sources can be maintained. There is no need to change or redesign the protection system in this solution. The proposed method, by activating the instantaneous characteristic along with the characteristic curve of the relay in the system, was able to establish coordination between the protections and transient stability of the synchronous generators in the distribution system for a penetration coefficient of 0 to 100%. The results of the implementation of the proposed method on the standard 33-bus IEEE test system in the ETAP software environment confirm its capability. Manuscript profile
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  8 - Frequency Control in Autanamous Microgrid in the Presence of DFIG based Wind Turbine
  Ghazanfar Shahgholian Khosro Khani Majid moazzami
  20.1001.1.23223871.1394.6.23.1.9
  Despite their ever-increasing power injection into power grid, wind turbines play no role in frequency control. On the other hand, power network frequency is mainly adjusted by conventional power plants. DFIG-based wind turbines not only are able to produce power in var More

  Despite their ever-increasing power injection into power grid, wind turbines play no role in frequency control. On the other hand, power network frequency is mainly adjusted by conventional power plants. DFIG-based wind turbines not only are able to produce power in various mechanical speeds, but they can also reduce speed instantaneously which, in turn, leads to mechanical energy release. Thus, they can aid conventional units in system frequency control. In this paper, the effect of wind energy conversion systems, especially variable speed DFIG-based wind turbines, in controlling and tuning of frequency is investigated when different penetration coefficients are considered in a isolated microgrid comprising of conventional thermal and non-thermal generating unit. To do this, optimal tuning of DFIG's speed controller is performed in different penetration levels using particle swarm optimization (PSO) technique. In addition, optimum penetration of wind energy conversion system is studied considering frequency change parameters in a microgrid Manuscript profile
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  9 - Damping Torsional Torques in Turbine-Generator Shaft by Novel PSS Based on Genetic Algorithm and Fuzzy Logic
  Abbas Shoulaie Mohammad Bayati-Poudeh Ghazanfar Shahgholian
  20.1001.1.23223871.1389.1.2.1.2
  Torsional torques on turbine-generator shaft which are yields of disturbances in power systems, can reduce the useful lifetime of shaft. In this paper, these oscillations will be damped and controlled by novel Power System Stabilizers (PSSs). Complex PSS which is used i More

  Torsional torques on turbine-generator shaft which are yields of disturbances in power systems, can reduce the useful lifetime of shaft. In this paper, these oscillations will be damped and controlled by novel Power System Stabilizers (PSSs). Complex PSS which is used in this paper will act on the excitation system in generator set and also on the controller of in High Voltage Direct Current (HVDC) system. This PSS uses three terms (generator angle deviation, frequency oscillation and capacitor voltage deviation in HVDC system) of the study system which includes two ties AC and DC. This is the reason that this PSS is named novel one against the conventional PSSs. In order to adjust the PSS parameters to damp the oscillations, genetic algorithm is used. To improve the application of this PSS, fuzzy logic control methods are also used which has notable effect on controlling the oscillations in study system. The simulation results show the effectiveness of designed PSS in controlling the torsional torques in turbine-generator shaft. Manuscript profile
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  10 - Designing and Simulation of a Two-Axis Solar Tracking System by Exact Relations of Solar Angles
  Faezeh Esmaili Ranjbar Hasan Fatehi Marj Ghazanfar Shahgholian
  20.1001.1.23223871.1391.3.12.1.6
  In this study, a system has been designed and simulated to track sunlight, which identifies sun location based on the exact relations of solar angles and without any optical sensor. In fact the relations which have been used in this study are far more accurate compared More

  In this study, a system has been designed and simulated to track sunlight, which identifies sun location based on the exact relations of solar angles and without any optical sensor. In fact the relations which have been used in this study are far more accurate compared to similar cases, because of using the "equation of time" and reducing the tracking time of every 15 minutes. In this system, an economical micro-controller has been used to generate the necessary orders to control system and two stepper motors for powering solar array. By adding a real-time clock IC (RTC) to angle differentiation circuit, dynamic plane has improved. Manuscript profile
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  11 - The Improvement DSTATCOM to Enhance the Quality of Power Using Fuzzy- Neural Controller
  Ghazanfar Shahgholian Ebrahim Haghjoo Alireza Seifi Iraj Hassanzadeh
  20.1001.1.23223871.1390.2.6.1.7
  In this article the performance of a DSTATCOM as an efficient parallel compensator, for obtaining the power indexes has been considered, Then, to improve the performance of DSTATVOM, each of its PI controller has been substituted by a nonlinear fuzzy-neural controller, More

  In this article the performance of a DSTATCOM as an efficient parallel compensator, for obtaining the power indexes has been considered, Then, to improve the performance of DSTATVOM, each of its PI controller has been substituted by a nonlinear fuzzy-neural controller, based on trial error and derivation of system error. The cause of detorioration of power quality and the method of their compensation, in a distribution network, has been analysed, using Matlab. The simulation results show that, using the fuzzy-neural controller in place of linear controller in DSTATCOM controller, the ability of compensation in the active and reactive power voltage sag, swell and fliker, and reduction of low current and voltage harmonics has been improved cansiderably. Manuscript profile
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  12 - Designing a Two-Phase BLDC Motor and Finite-Element Analysis of Designing a Controller in Order to Manoeuvre High-Speed Boats in Marine Turbulences
  Mehrdad Jafarboland Ehsan Vehedi Ghazanfar Shahgholian
  20.1001.1.23223871.1392.4.16.2.2
  High speed boats are small kind of boats which are piloted with boatman.These boats are usually used in strategic commissions like military which fast speeds and good manoeuvrability are of essential importance.Rough sea path, marine turbulences and multi input multi ou More

  High speed boats are small kind of boats which are piloted with boatman.These boats are usually used in strategic commissions like military which fast speeds and good manoeuvrability are of essential importance.Rough sea path, marine turbulences and multi input multi output nonlinear dynamical model of this boats,make it very difficult to pilot and manoeuvre them.in this paper,.two controller are designed and proposed for pursuing desired path and manoeuvring fast speeds.Fuzzy controller is compared with the result of PID controller. Simulation results also indicate that these proposed controllers have suitable responses and can pilot the boat in the best manner. Manuscript profile
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  13 - Design of Power System Stabilizer based on Sliding Mode Control Theory for Multi- Machine Power System
  Ghazanfar Shahgholian Amin Rajabi Bahram Karimi Mohammad Reza Yousefi
  20.1001.1.23223871.1389.1.1.2.1
  This paper presents a new method for designing of power system stabilizer (PSS) based on sliding mode control (SMC) technique. The control objective is to enhance stability and improve the dynamic response of the multi-machine power system. The mathematical model of the More

  This paper presents a new method for designing of power system stabilizer (PSS) based on sliding mode control (SMC) technique. The control objective is to enhance stability and improve the dynamic response of the multi-machine power system. The mathematical model of the synchronous generator is first transformed into a form that facilitates the design of nonlinear control schemes. Then, a sliding mode controller is proposed. In order to test effectiveness of the proposed scheme, simulation will be carried out to analyze the small signal stability characteristics of the system about the steady state operating condition following the change in the parameters of the system and to the disturbances. For comparison, simulation of a conventional control PSS (lead-lag compensation type) will be carried out. The main approach is to focus on the control performance which later is proven to have the degree of shorter reaching time and lower spike. Manuscript profile
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  14 - Comparison of Two Cogging Torque Reducing Methods of 6-Poles Single Phase SMPM
  Amir Hossein Tavakol Zadeh Javad Faiz Ghazanfar Shahgholian
  20.1001.1.23223871.1392.4.13.3.7
  Surface permanent magnet structure of pm machines is widely used in these types of machines.  In the slotted machines, low armature reaction and high overload capability features can be achieved by selecting surface permanent magnets. A uniform air gap, the basic n More

  Surface permanent magnet structure of pm machines is widely used in these types of machines.  In the slotted machines, low armature reaction and high overload capability features can be achieved by selecting surface permanent magnets. A uniform air gap, the basic nature of a permanent magnet motor with surface permanent magnet and without slots. Cogging torque creates variable reluctance of the air gap because of slots existence. Cogging torque can be reduced in different ways. This paper surveyed two pm setting methods that are inclusive shifting and sliced surface pm. Results show that shifting method has more effect on reducing of cogging torque. Manuscript profile
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  15 - Evaluation of the Trajectory Sensitivity Analysis of the DFIG Control Parameters in Response to Changes in Wind Speed and the Line Impedance Connection to the Grid DFIG
  Mehdi Fooladgar اسمعیل Rokrok Bahador Fani Ghazanfar Shahgholian
  20.1001.1.23223871.1393.5.20.4.9
  Economic and environmental conditions often make large stations and transmission lines, restrictions are placed. Small and medium-sized production units connected to existing systems as a strategy is in progress. These units are usually near the center of the load place More

  Economic and environmental conditions often make large stations and transmission lines, restrictions are placed. Small and medium-sized production units connected to existing systems as a strategy is in progress. These units are usually near the center of the load placed and distributed generators (DG) famous are the DG are allowed types vary, such as induction generators rack squirrel-connected wind turbines, generators fed induction double mounted wind turbines, fuel cells connected to the system by power electronic converters or synchronous generator connected to the turbine combustion [10]. This way sensitivity analysis in systems of distributed generation (DG) is assessed. It is shown that the method can detect the effect of control parameters listed wind turbine connected to a double-fed induction generator (DFIG) Badoou the impedance of the changing the speed of on the stability of the transmission line useful system invested. The control parameters of the importance of influencing the behavior of DFIG are divided. Manuscript profile
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  16 - Improving the Drive System of Permanent Magnet Linear Synchronous Motor Based on Direct Thrust Force Control Applying Space Vector Modulation
  Mehdi Manoochehri Javad Faiz Ghazanfar Shahgholian
  20.1001.1.23223871.1391.3.11.6.9
  Applying the direct thrust force control (DFC) method in permanent magnet linear synchronous motor (PMLSM) leads to some important problems. The most important disadvantages of applying this method are electromagnetic force and linkage flux big ripple and variable switc More

  Applying the direct thrust force control (DFC) method in permanent magnet linear synchronous motor (PMLSM) leads to some important problems. The most important disadvantages of applying this method are electromagnetic force and linkage flux big ripple and variable switching frequency. In this paper space vector modulation (SVM) technique is applied for removing the disadvantages of classic DFC method. SVM technique makes the switching frequency constant and provides continues Voltage space compared with discrete space in classic method. Simulation results confirmed the theory. They show that combining the DFC method with SVM technique removes lots of the disadvantages of classic DFC method like big ripples and variable switching and remains the benefits of this method.  Manuscript profile
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  17 - Optimal PID Controller Tuning for Multivariable Aircraft Longitudinal Autopilot Based on Particle Swarm Optimization Algorithm
  Mostafa Lotfi Forushani Bahram Karimi Ghazanfar Shahgholian
  20.1001.1.23223871.1391.3.9.5.4
  This paper presents an optimized controller around the longitudinal axis of multivariable system in one of the aircraft flight conditions. The controller is introduced in order to control the angle of attack from the pitch attitude angle independently (that is required More

  This paper presents an optimized controller around the longitudinal axis of multivariable system in one of the aircraft flight conditions. The controller is introduced in order to control the angle of attack from the pitch attitude angle independently (that is required for designing a set of direct force-modes for the longitudinal axis) based on particle swarm optimization (PSO) algorithm. The autopilot system for military or civil aircraft is an essential component and in this paper, the autopilot system via 6 degree of freedom model for the control and guidance of aircraft in which the autopilot design will perform based on defining the longitudinal and the lateral-directional axes are supposed. The effectiveness of the proposed controller is illustrated by considering HIMAT aircraft. The simulation results verify merits of the proposed controller. Manuscript profile
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  18 - Modeling and Simulation of the Single Phase Voltage Source UPS Inverter With Fourth Order Output Filter
  Javad Faiz Ghazanfar Shahgholian Mehdi Ehsan
  20.1001.1.23223871.1389.1.4.8.3
  A UPS inverter operates in wide load impedance ranges from resistive to capacitive or inductive load. At the same time, fast transient load response, good load regulation and good switching frequency suppression is required. The variation of the load impedance changes t More

  A UPS inverter operates in wide load impedance ranges from resistive to capacitive or inductive load. At the same time, fast transient load response, good load regulation and good switching frequency suppression is required. The variation of the load impedance changes the filter transfer characteristic and thus the output voltage value. In this paper, an analysis and simulation of the single phase voltage source uninterruptible power supply (UPS) with fourth order filter (multiple-filter) in output inverter, based on the state space averaging and small signal linearization technique, is proposed. The simulation results show the high quality sinusoidal output voltage at different loads, with THD less than %5. Manuscript profile