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This paper studied mathematical model of doubly-fed induction generator (DFIG) based wind turbine generation system under unbalanced voltage. A dual-PI current control strategy was proposed to improve the performance of DFIG's rotor side convert (RSC) under asymmetrical voltage condition. The symmetrical component theory is employed to decompose asymmetrical three-phase variable such as voltage and...
In this paper two methods of torque control for induction motor have been investigated. First DTC method is implemented by using PI regulators and three-level inverter. Then an improved predictive torque control is developed and performed with two-level inverter. In the proposed predictive control the next torque and flux are predicted by discrete model of motor and inverter. Afterward the feasible...
This paper presents the speed control scheme of indirect vector controlled induction motor (EVI) drive. Voltage source inverter type space vector pulse width modulation (SVPWM) is used for PWM controlling scheme. An intelligent based on Fuzzy PI controller is developed for controlling the torque component Iq current of an EVI. The complete vector control scheme of the IM drive incorporating the FLC...
This paper presents a Genetic Algorithm (GA) based fast speed response controller for poly-phase induction motor drive. Here the proportional and integral gains of PI controller are optimized by GA to achieve quick speed response. An adaptive Recurrent Neural Network (RNN) with Real Time Recurrent Learning (RTRL) algorithm is proposed to estimate rotor flux. An online tuning scheme to update the weight...
Presently work exists within the IEEE to develop a test standard for Permanent Magnet AC (PMAC) machines that includes a specification on the quality of current supplied to the machine. The research presented in this paper offers a comparison on the quality of current provided to the machine for three control strategies; Space Vector, PI and Bang-Bang. The tests conducted were of an “on the fly” nature...
Non-sinusoidal back electromagnetic forces cause torque ripple in permanent magnet synchronous motors. These harmonics should be reduced by means of an appropriate current control to improve performance. Good results have been obtained with linear regulators such as repetitive controllers in synchronous reference frame (SRF) and resonant controllers in stationary frame. Repetitive controllers present...
This paper designs a novel control method for energy efficient and wide speed range drive of the PMSM. The proposed method includes several parts: (1) using a PI speed controller to create a signed current norm value as input of the command converter. (2)The command converter can simply and accurately generate an analytical current command according to the current control standard satisfying the maximizing/current...
A novel neural network, retina neural network (RNN) is put forward, and its definition, network structure, parameters, and characteristic are presented. After training it using a set of samples, an ideal training waveform is obtained, which is a great guide for future research. Moreover, a model of permanent magnet synchronous motor (PMSM) PI controller is constructed based on RNN to test drive performances...
This paper presents an improved performance of a Permanent Magnet Synchronous Motor (PMSM) using a hybrid Fuzzy/ Proportional-Integral (PI) controller. Hybrid control has an advantage of integrating a superiority of two or more control techniques for better control performances. A fuzzy controller offers better speed responses for start-up and large reference input changes (large speed error) as compared...
This paper presents three current control strategies for a switched reluctance machine (SRM). Two classical controllers are recall : the hysteresis and the proportional - integral controller. Dynamic and current ripples with both controllers are compared and discussed. Then, a new current controller qualified as “hybrid controller” is proposed. It is a combination of the two previous structures. The...
This paper considers a linear control design of separately excited DC motor system (SEDCM) operated in the field weakening high speed regime. Nonlinear multiple input - multiple output (MIMO) feedback linearization is applied and a linear controller schema is proposed. It is shown that very good control performances can be obtained with the classical PI cascaded linear controllers in conjunction with...
A DSP-based permanent magnet synchronous motor drive for satellite reaction wheel application is established in this paper. Its current control scheme consists of a PI feedback controller, a resonant-based feedback controller and a robust tracking error cancellation controller to yield good sinusoidal winding current command tracking control. As to the speed control scheme, the feedback controller...
This paper presents an approach for the initial rotor position detection in permanent magnet synchronous machine (PMSM) drives. It is based on injection of low frequency current and excitation of small rotor speed oscillations. In this way information about spatial position of the rotor flux can be retrieved from the stator voltage response regardless of the rotor (average) speed. The method presented...
This paper presents the digital implementation of torque and motion control of a Direct Current (DC) motor for direct-drive industrial robotic applications. The electromagnetic torque is controlled by using a predictive algorithm and the motion by using digital P-PI controllers in a cascaded structure. In this way, high-performance torque and position control can be achieved with the advantages of...
In this paper, a nonlinear PI controller is developed to control speed of PMSM, it can adjustment of controller parameters automatically in order to achieve the best control effect in control process. Simulation results show that it was faster than the traditional controller response and have a smaller overshoot.
The role of proportional-integral (PI) controller as a speed controller for a induction Motor (IM) in high performance drive system is still vital although new control techniques such as direct torque control that is more effective -but complex- is available. However, PI controller is slow in adapting to speed changes, load disturbances and parameters variations without continuous tuning of its gains...
This paper presents a fuzzy logic controller (FLC) based tuned proportional-integral (PI) controller for interior permanent magnet synchronous motor (IPMSM) drive. The PI controller serves as the primary speed controller whose gains are tuned by a novel Sugeno type FLC. Thus, the limitations of traditional PI controllers are avoided and the performance of the drive system is improved. A flux controller...
In this paper, a robust self-tuning fuzzy speed controller for direct torque control using space vector modulation (SVM) technique is proposed for the high performance drives of induction motor. The design of robust self-tuning fuzzy speed controller greatly affects the performance of Induction Motor (IM) fed with a Voltage Source Inverter (VSI). The performance of the proposed self-tuning Fuzzy PI...
This paper presents a control scheme combined with neural network, fuzzy controller and PI- controller for the brushless DC motor. The neural network control learned continuously and gradually becomes the main effective control. Performances of the proposed neural network are compared with the corresponding fuzzy PI controller and conventional PI controller. Matlab/simulink software was used to simulate...
In the last decades, fault diagnosis of voltage source inverters has received a lot attention since their application to variable speed drives has become an industrial standard. Recently, some methods have been suggested for open-circuit faults in the switching devices of voltage source inverters. However, most of these methods might not work properly for different working conditions of the motor...
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