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This paper presents the fuzzy inference system for selecting the switch states of matrix converter using Direct Torque Control Technique to control the speed of induction motor. In this system, two fuzzy controllers are used. One fuzzy controller estimates the voltage and the other fuzzy controller is used to select the switching vector based on the voltage vector selected by the first fuzzy controller...
In the traditional direct torque control (DTC) of induction motor, the low order harmonic component of stator current is very large when the motor is running at low speed. It leads to high torque ripple of motor in low speed. To solve this problem, a new control method has been proposed in this paper. Base on the traditional DTC method, electromagnetic torque and flux models have been analyzed. To...
Direct torque control of induction motor is a kind of high performance of AC drive control method, the method of space vector analysis is the applied, The stator magnetic field, directly on the electromagnetic torque motor stator flux and control. But the change of the stator resistance will affect the performance of direct torque control system when the motor at the low speed This paper describes...
The design and implementation of an adaptive neural network based proportional-integral controller (NNPIC) were carried out on the direct torque control (DTC) system. The proposed controller consists of neural network and projection algorithm, in order to tune its parameters adaptively online under environmental variations. The experimental results proved that the performance of the proposed controller...
Normal direct torque control have the problem of big electricity and torque ripple in low speed, a new control method was presented in this paper in order to solve this problem. We use discrete duty ratio control technology in high region while intelligent direct torque control is used for the low speed region control. Simulation and experiment result show that new method is more effective than traditional...
This paper presents an on-line estimation for the stator resistances of the induction motor in the direct torque controlled drive, using artificial neural networks. The variation of stator resistance due to changes in temperature or frequency degrades the performance of such control strategy. In order to solve this issue, a backpropagation algorithm is used for training of the neural network. The...
Due to the multi-variable, strong coupling, nonlinear and time-varying characteristics of induction motor, it is not easy for direct torque control (DTC) system with traditional PID controller to get ideal performance. In order to improve the performance of Direct Torque Control system, a fuzzy PID regulator of motor speed is proposed to adjust the nonlinear control variable. According to the principle...
This work is developed within the improvement of the performance of DTC based position control of an induction machine. The paper is devoted to the presentation of a comparison study between three DTC strategies applied in position control of an induction motor: (i) the Takahashi basic strategy using a two-level inverter and considering six sectors, (ii) a strategy based on the Takahashi one using...
This paper presents a robust sensorless Direct Torque Control (DTC) method for induction motor (IM) for estimation of stator flux components and rotor speed based on the Modified Kalman Filter (MKF). The model of IM and its MKF models in Matlab /Simulink simulation environment are developed. The proposed MKF speed and flux estimation method is also proved insensitive to the IM parameter variations...
This paper investigates a new direct torque control (DTC) strategy for induction machine based on particle swarm optimization (PSO). The PSO was used to adjust the parameters (Kp, Ki, Kd) of PID controller. The scheme improves the adjustive capability of PID controller. The new direct torque controlled strategy is considered in detail and it is shown that the use of PSO-PID controller decrease the...
The high performance sensorless AC drives require a fast digital realization of many mathematical operations concerning control and estimatorspsila algorithms, which are time consuming. Therefore developing of custom-built digital interfaces as well as digital data processing blocks and sometimes even integration of ADC converters into one integrated circuit is necessary. Due to the fact that developing...
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