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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 method for estimating the torque and speed of line-start induction motor (IM). IM is being used for various purposes because that is a high trust machine for the load mechanism and can be used easily. So, IM is non-breakable. However, load mechanism sometime break. We try to check the condition of load mechanism by estimate the torque and speed of IM. We take up the motor-operated...
This paper proposes the controlling method for induction motor operating at high efficiency in transient state. We propose a method of current control to minimize stator current in case of giving torque we want. First of all, we understood problems of vector controlled for induction motor and suggest methods to solve these problems. In the simulation, the efficiency in the transient state is evaluated...
In this paper two methods of torque control for induction motor have been investigated. First, DTC method is implemented by using complete voltage vectors of the matrix converter. Second, 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...
A sensorless direct torque controlled (DTC) induction motor drive fed by a 3-level inverter is presented based on discrete space vector modulation. A novel vector synthesis sequence is proposed to solve the problems caused by the topology of the 3-level inverter, such as neutral point unbalance and excessive voltage jump, while maintaining the merits of simplicity and robustness. Fuzzy logic control...
Field oriented control methodologies are one of the dominant industry standards for induction machine drives. While this classical approach has continuously improved, direct torque control (DTC) has emerged as an alternative approach. Deadbeat, direct torque and flux control (DB-DTFC) is a more recent scheme and employs a discrete-time model inversion to achieve decoupled control of both torque and...
In this work the application of additional switching states for the asymmetric converter is studied for its use in direct torque control. The proposed algorithm makes use of previously discarded states, that can increase the operational range of asymmetric converters by increasing the total number of switching states available for control. The proposed algorithm was simulated while controlling an...
This paper presents a new method of control based on direct torque control (DTC) strategy. This method is designed to be applied in the control of induction motors (IM) fed with a three-level voltage source inverter (VSI). This type of inverter has several advantages in comparison with standard two-level VSI, such as a greater number of levels in the output voltage waveforms, lower dV/dt, less harmonic...
This contribution deals with design of sliding mode based stator flux observer for direct torque and flux controlled induction machine drives. Proposed flux observer is completed by simple estimation of rotor speed in order to achieve a sensorless drive control. Proper function of presented sensorless control is verified by both simulations and experiments made on designed laboratory prototype of...
This paper establishes the mathematical model of direct torque control (DTC) system of induction motor. Then a realization scheme of fully digitized direct torque control system is introduced with the DSP TMS320F2812 that works as the core control chip and IPM that works as main circuit. The control scheme obtains the switch control signal of inverter with the space voltage vector modulation technology...
This paper presents application of adaptive neuro-fuzzy inference system (ANFIS) into a squirrel cage induction machine towards modeling, control and estimation. This paper contributes (i) Development of a simple and more realistic model of the induction motor using ANFIS. Using ANFIS, the parameter sets of the motor model are estimated. The simplified model contains eleven estimated parameters. In...
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...
Present work shows the merits of space vector modulation direct torque control (SVPWM DTC) over the conventional direct torque control (conventional DTC). SVPWM DTC technique is helpful in solving the basic issues of torque ripple and variable switching frequency present in the conventional DTC. Three PI controllers one each for speed, torque and flux feedback loops is used in SVPWM DTC based IM drive...
This paper presents a simple technique based on stator flux estimation to control the electromagnetic torque of the induction motor during soft starting. The inherent problems related to pure integration of the back electromagnetic force to estimate the stator flux are minimized using the low pass filter approach. The experimental results are showed and compared with usual current control technique...
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 non-linear state-feedback input-output linearizing control with tracking controllers for a doubly fed induction motor -DFIM- connected to the grid utility is presented. For this purpose, An appropriate mathematical model of the -DFIM- based on the so-called stator-flux field oriented is detailed. In the rotor circuit, a three-level converter with an algebraic space vector modulation is used. Simulation...
This paper presents a new kind of direct torque control (DTC) system based on the inverter with double-frequency for the motor drives of electric vehicles (EVs). According to the theory of the converter with double-frequency, the topology of a new kind of inverter with double-frequency is derived, and the operation states of the new circuit are analyzed. This kind of inverter has good dynamic and...
For the direct torque control of induction motor, the flux weakening operation is required when the motor speed beyond the rated speed. The determining of flux weakening operation point is the key of up speed control. In this paper, the definition of stator flux maximum average synchronous speed is introduced to the direct control algorithm and the estimation formula is given as well. On this basis,...
A integrated torque control method of dual induction motors independent drive for tracked vehicle is studied. The induction mathematics model is made up, a torque voltage PI (proportional integral) controller of induction motor is designed, and a induction motor torque control strategy based on rotor flux oriented is proposed. A dual induction motors drive scheme for tracked vehicle is constructed,...
According to the equivalent circuit of three-phase induction motor, the supplying condition for energy saving has been deduced. And the relationship between output of speed and torque and input of supply voltage and frequency has been revealed. Then a scale-controlled scheme for the motor running at energy saving has been presented. Finally the energy-saving approach has compared with that of constant...
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