فهرس المقالات Vector control‎

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  1 - Vector control of induction motor using moving sliding mode fuzzy controller
  saman ebrahimi boukani
  A sliding motion can be divided into two phases: reaching phase and sliding phase. One of the features of sliding mode control is that it is robust to parameter uncertainties and external disturbances in the sliding phase. But in the reaching phase, SMC may be sensitive أکثر

  A sliding motion can be divided into two phases: reaching phase and sliding phase. One of the features of sliding mode control is that it is robust to parameter uncertainties and external disturbances in the sliding phase. But in the reaching phase, SMC may be sensitive to parameter uncertainty and external disturbance. The moving sliding surface proposed by Choi et al can minimize or eliminate the reaching phase. In this article, the sliding mode fuzzy controller design method with a moving sliding surface is presented. The simulation results show the superiority of SMFC over classical SMC and PID controller in the presence of external disturbances. تفاصيل المقالة
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  2 - Analysis and Performance Comparison of Vector Control Method with Direct Torque Control to Reduce Current and Speed ripples of Three-Phase Induction Motors
  Bizhan Gholami Mohsen Ebadpour
  Today, three-phase induction motors are widely used in industry due to advantages such as lower maintenance requirements, higher reliability, lower design costs, and the ability to operate in dusty and explosive environments. Vector control and direct torque control are أکثر

  Today, three-phase induction motors are widely used in industry due to advantages such as lower maintenance requirements, higher reliability, lower design costs, and the ability to operate in dusty and explosive environments. Vector control and direct torque control are two common methods for controlling induction motors. The control algorithm of the two methods is almost the same in some cases and completely different in others. Each of the control methods has advantages due to their general structure, which lead to a better response compared to other methods. The vector control method contains a good steady state response however offers relatively less speed dynamic responses and steady state time. Several methods have been proposed to solve this problem. In this paper, a switching table is used to select the appropriate switching modes for the induction motor drive to improve the output dynamic response. Comparison of the results obtained from the performance of the drive under test with the vector control and direct torque control methods illustrates that the response of the drive system to the vector control includes faster dynamics with less constant state fluctuations. In order to validate the performance of the drive system, MATLAB software has been utilized for modeling and simulation. تفاصيل المقالة
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  3 - Reduction of Torque Ripples of Three-Phase Induction Motors Using Hybrid Vector Control Based on Space Vector Modulation
  Bizhan Gholami Mohsen Ebadpour
  Three-phase induction motors as widely used electric drives in industry, automation, transportation and electric vehicles are mainly controlled by two conventional methods, vector control (VC) and direct torque control (DTC). The vector control method has a suitable ste أکثر

  Three-phase induction motors as widely used electric drives in industry, automation, transportation and electric vehicles are mainly controlled by two conventional methods, vector control (VC) and direct torque control (DTC). The vector control method has a suitable steady state response, but in terms of dynamics and time to reach the steady state, it provides a relatively slower response. In contrast, the direct torque control method works almost the opposite way and provides a better dynamic response. Therefore, providing a control strategy that combines the advantages of the two mentioned methods as much as possible improves the driving performance of the induction motor. This paper presents a hybrid control method based on the optimal keying table to select the appropriate keying modes for the induction motor drive converter to improve the output dynamic response. To reduce current and torque ripples in different operational states, the space vector modulation technique has been used in the proposed drive system. The efficiency of the drive system presented with the hybrid control strategy has been compared with the conventional DTC and VC control methods, and the results illustrate a faster dynamic response of the proposed drive system with less steady-state ripples than the two conventional methods. Modeling and implementation of the proposed drive system have been performed in MATLAB/Simulink software. تفاصيل المقالة
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  4 - MRAS observer based on rotor current for DFIG sensorless control in network voltage drop condition
  Ali Khodadadi Mohammad Esmaeil akbari Mohsen Ebadpour Hosein Nasir Aghdam
  This paper introduces a new application of the Rotor based-current MRAS observer (RCMO) method for Doubly fed induction generator (DFIG) sensorless control in the condition of network voltage drop. DFIG control is Field oriented control (FOC) vector and Model reference أکثر

  This paper introduces a new application of the Rotor based-current MRAS observer (RCMO) method for Doubly fed induction generator (DFIG) sensorless control in the condition of network voltage drop. DFIG control is Field oriented control (FOC) vector and Model reference adaptive system (MRAS) observer is used instead of speed and position sensor based on rotor current. It is possible to estimate the speed and position of the rotor. Simulation and analysis have been done based on 10% balanced voltage drop in the wind power plant terminal. The results of the simulation show the estimated speed (ω̂r), accurate and appropriate sequence of speed has real (ωr). Also, the graph of the machine variables in the state of balanced three-phase voltage drop in the state sensored is obtained and compared with the state sensorless, which shows the lack of influence of the estimated speed fault on the simulation results and the acceptability of using the RCMO method in estimating the speed in the condition of balanced voltage drop. Finally, the effect of various voltage drops on the estimated speed fault has been investigated. تفاصيل المقالة
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  5 - A Simple Strategy for DRFOC of 3-phase Induction Motors under Single-phase Open Fault
  Mohammad Shabandokht-Zarami Mahmood Ghanbari Esmaeil Alibeiki Mohammad Jannati
  This research investigates a simple method for Direct Rotor Field-Oriented Control (DRFOC) of star-connected 3-Phase Induction Motor (3Ph IM) drives under Single-Phase Open Fault (SPOF). The proposed control scheme includes a modified RFOC strategy in cooperation with a أکثر

  This research investigates a simple method for Direct Rotor Field-Oriented Control (DRFOC) of star-connected 3-Phase Induction Motor (3Ph IM) drives under Single-Phase Open Fault (SPOF). The proposed control scheme includes a modified RFOC strategy in cooperation with a flux linkage observer. Most studies on this topic are intended for Indirect Rotor Field-Oriented Control (IRFOC), and hence are not appropriate at low speed operation due to using a pure integration for the flux angle calculation. To this end, a rotor flux linkage observer is designed which alleviates the speed and torque ripples of the faulty motor during low speed operation. The observer is capable of estimation of the rotor flux during healthy and SPOF conditions by only some modifications in the 3Ph IM parameters. The proposed DRFOC approach is tested under different conditions and the effectiveness of the proposed system is confirmed by experimental results. The results show the good fault tolerant capability and tracking performance of the proposed controller during different speeds. تفاصيل المقالة
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  6 - Compensation of Current Harmonic Components of Nonlinear Loads in ‎Presence of Distributed Generation Resources Using Multi-Criteria Vector ‎Control
  Solgun Salimi
  Filtering the harmonics produced by nonlinear loads in power systems is an important issue for the engineers to follow. In most cases, to this end, active filters have been used. In this paper, however, it is shown that this task can be accomplished using a Multi-Criter أکثر

  Filtering the harmonics produced by nonlinear loads in power systems is an important issue for the engineers to follow. In most cases, to this end, active filters have been used. In this paper, however, it is shown that this task can be accomplished using a Multi-Criteria algorithm and distributed generations (DGs) resources. In the proposed algorithm, when the DGs are connected to the main network, compensations of active and reactive powers as well as harmonic components are possible. To do so, first, the dynamical model of the systems will be shown in details in the static three-phase system, and then, they are transferred to a rotating orthogonal set using the necessary conversion equations. Therefore, the transferred variables are used to control the voltage source converters in order to achieve improvements in DGs’ behavior when they are connected to the network. In this control method, the active and reactive powers transmitted to the load as well as the current harmonics are compensated using samples of voltages and currents taken at the connection points; thus capabilities for sinusoidal current and maximum active power transmissions are provided. Besides, the control proposed method has a fast dynamical response in active and reactive power compensations. Therefore, using this control approach, the transmitted power of DGs to the network are maximized, the power coefficient factor is improved and current harmonics of the load are decreased significantly. تفاصيل المقالة
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  7 - درایوهای موتور القایی تکفاز
  غلامرضا عرب مارکده ایوب باباسالاری
  در این مقاله سعی شده است به طور مختصر موتورهای القایی تکفاز گوناگون مورد بررسی قرار گرفته و با یکدیگر مقایسه شوند. همچنین مروری بر مبدلهای مختلف مورد استفاده برای کنترل سرعت و راندمان موتور القایی تکفاز شده و معایب و محاسن آنها به تفضیل مورد بحث قرار گرفته است. با مقایس أکثر

  در این مقاله سعی شده است به طور مختصر موتورهای القایی تکفاز گوناگون مورد بررسی قرار گرفته و با یکدیگر مقایسه شوند. همچنین مروری بر مبدلهای مختلف مورد استفاده برای کنترل سرعت و راندمان موتور القایی تکفاز شده و معایب و محاسن آنها به تفضیل مورد بحث قرار گرفته است. با مقایسه توپولوژیهای گوناگون مشخص می‌شودکه اینورتر PWM فرکانس متغیر بهترین انتخاب برای کنترل موتور القایی تکفاز است. تفاصيل المقالة
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  8 - کنترل برداری موتور القائی با استفاده از روش مدولاسیون بردار فضائی با اینورتر منبع جریان
  غلامرضا عرب مارکده فروغ تاکی سعید اباذری
  از آنجایی که گشتاور یک ماشین القایی توسط جریان ماشین و شار فاصله هوایی تعیین می گردد، کنترل مستقیم جریان به جای ولتاژ بسیار مناسب به نظر می رسد. همچنین مدولاسیون بردار فضایی (SVM) روش برتری برای اینورترها ی منبع جریان از نظر کاهش هارمونیک های مرتبه پایین، فرکانس کلیدزنی أکثر

  از آنجایی که گشتاور یک ماشین القایی توسط جریان ماشین و شار فاصله هوایی تعیین می گردد، کنترل مستقیم جریان به جای ولتاژ بسیار مناسب به نظر می رسد. همچنین مدولاسیون بردار فضایی (SVM) روش برتری برای اینورترها ی منبع جریان از نظر کاهش هارمونیک های مرتبه پایین، فرکانس کلیدزنی پایین تر و پیاده سازی آسان تر می باشد. این مقاله به معرفی مدولاسیون بردار فضایی برای اینورتر منبع جریان می پردازد. سپس با کنترل برداری ماشین القایی تغذیه شده با اینورتر منبع جریان، نتایجی ارائه می کند که برتری مدولاسیون SVM را از جهت پاسخ دینامیکی سریع و کنترل ساده تر گشتاور به اثبات می رساند. تفاصيل المقالة
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  9 - A Combined Vector and Direct Power Control for AC/DC/AC Converters in DFIG Based Wind Turbine
  Reza Najafi
  The doubly-fed generators (DFIG) have clear superiority for the applications of large capacity and limited-range speed control case due to the partially rated inverter, lower cost and high reliability. These characteristics enable the doubly-fed wound rotor induction ma أکثر

  The doubly-fed generators (DFIG) have clear superiority for the applications of large capacity and limited-range speed control case due to the partially rated inverter, lower cost and high reliability. These characteristics enable the doubly-fed wound rotor induction machine to have vast applications in wind-driven generation.In this paper Combined Vector and direct power control (CVDPC) strategy is applied to control a doubly fed induction generator (DFIG) based wind energy generation system. AC/DC/AC converter is controlled by Combined Vector and direct power control method. The rotor side converter is controlled by selecting appropriates voltage vector based on the instantaneous errors between the reference and estimated values of active and reactive powers and rotor flux position. Also the Grid side is controlled by Combined Vector and direct power control based a grid voltage position to ensure a constant DC voltage, Simulation results demonstrate robust, precise, and fast dynamic behavior of the system. Keywords: Doubly Fed Induction Generator, Vector Control, Direct Power Control, VCDPC. تفاصيل المقالة
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  10 - Sensorless Vector Control of Linear Induction Motor on Primary and Secondary Flux Oriented based on Fuzzy PI Controller
  Mohammad Sarvi Hassan Zamani
  This paper presents a sensorless system drive on primary flux oriented control (PFOC) and secondary flux oriented control (SFOC) for the linear induction motor (LIM) with taking into account end effect. Extended kalman filter (EKF) is applied to estimate LIM speed by me أکثر

  This paper presents a sensorless system drive on primary flux oriented control (PFOC) and secondary flux oriented control (SFOC) for the linear induction motor (LIM) with taking into account end effect. Extended kalman filter (EKF) is applied to estimate LIM speed by measuring motor voltages and currents. In order to achieve desirable dynamic and robustness motor performance instead of traditional PI controller, a fuzzy PI controller is used for speed regulation in LIM vector control. The accuracy and validity of fuzzy PI controller operation are investigated and evaluated and its results are compared with traditional PI controller. Transient and steady state responses of proposed controller under load thrust variations and speed command are studied. Also characteristics and performances of primary flux oriented control (PFOC) and secondary flux oriented control (SFOC) for the linear induction motor are compared with each other. In order to evaluate the proposed method, simulations are performed in MATLAB/SIMULINK. Results show that the fuzzy PI controller has more excellent performance than the traditional PI controller and also PFOC has better performance than SFOC, because SFOC depend on rotor resistance. EKF properly estimate motor speed by measuring motor voltages and currents and therefore speed sensor can be eliminated تفاصيل المقالة
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  11 - Modelling the Impact of Trapping Blackfly Vectors on the Transmission of Onchocerciasis
  Julius Tumwiine Raymond Muhumuza
  Onchocerciasis, usually referred to as river blindness, a skin and eye parasitic infestation is caused by the filarial nematode Onchocerca volvulus. Current control and eradication efforts are being frustrated by the continued existence and thriving of blackflies which أکثر

  Onchocerciasis, usually referred to as river blindness, a skin and eye parasitic infestation is caused by the filarial nematode Onchocerca volvulus. Current control and eradication efforts are being frustrated by the continued existence and thriving of blackflies which are the disease transmitting vectors that breed along the banks of fast flowing and highly oxygenated rivers and streams. This study aims at assessing the effect of using vector traps on the transmission and control of onchocerciasis. A host-vector deterministic model which incorporates vector trapping by use of a system of ordinary differential equations is developed. The model is analysed for steady states and the basic reproduction number is obtained using the next generation method. It is found that the disease free steady state is stable if the basic reproduction number R0<1. There exists a unique endemic equilibrium which is locally and globally asymptotically stable if R0>1. Numerical simulations show that trapping the blackfly vectors has an effect on the spread and control of the disease. However, it is discovered that using traps alone is not a sufficient strategy and needs to be combined with other methods if the disease is to be completely wiped out of the population. تفاصيل المقالة