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Predictive torque control (PTC) gains a lot of interest lately. Although the flux-weighting factor is the only tuning parameter in PTC, its selection is not a trivial task. This paper proposes an improved multi-objective fuzzy decision based method to select the best compromise voltage vector. The salient feature of the proposed approach lies in its capability to avoid high torque ripple and the need...
Induction motors, which have been widely used in various practical applications, such as fans, pumps, machine tools, vehicle traction motors, etc., are truly the industrial workhorses over the past 120 years. To improve the sensorless induction motor control performance and develop more fault-tolerant motor drives, the paper presents a novel sensorless direct torque control approach based on the proposed...
This study aims to design an adaptive output recurrent cerebellar model articulation controller (AORCMAC), which is embedded into the direct torque control (DTC) system of an induction motor as the speed controller. Similar to the conventional cerebellar model articulation controller (CMAC), the designed AORCMAC also has the advantages of rapid learning, simple architecture, online training, and nonlinear...
The common-mode voltage (CMV) could cause severe hazards to the induction machine winding insulation and bearings, reducing the machine lifetime. This paper proposes an improved predictive torque control (PTC) method with CMV reduction strategy which cost little and much smaller than traditional filter method. A simulation based on SIMULINK is analyzed which verify the effectiveness of the proposed...
The direct torque control (DTC) suffers from high torque and flux ripples due to the use of hysteresis comparators. In this paper, an alternative method is presented for induction motor drive known by the model Predictive Torque Control (PTC). This technique includes the inverter model in control design and does not use any modulation block. The optimal selection of inverter switching states minimizes...
In this paper a flux weakening method for a wind power permanent magnet generator is proposed. In a wind energy conversion system, the rotor speed increases with the wind speed, hence a flux weakening (FW) algorithm should be implemented as a part of the control structure in order to prevent generator voltage from exceeding the maximum permissive value. On the other hand, it is essential to provide...
In this paper, a novel Multivariable Sliding-mode Extremum Seeking (MSES) Proportional-Integral (PI) tuning method is proposed and its application is studied for torque control in a Permanent Magnet Synchronous Motor (PMSM). To this end, the stator three-phase currents are characterized by their maximum amplitude which directly controls the shaft torque. Hence, a PI controller is applied for controlling...
A new sensorless direct torque control method for PM-Assisted synchronous motor drives is proposed in this paper. The stator flux linkage amplitude and electromagnetic torque are the two controlled variables which are regulated in stator flux frame. Unlike the two most conventional sensorless methods at low speeds, high frequency (HF) rotating carrier voltage injection into stationary reference frame...
This paper presents some of the main problems, as well as their root causes, of Direct Torque Control (DTC) 3-phase induction motor drive. The high torque ripple in DTC drive due to the hysteresis controller inevitably becomes worst with the discrete implementation of the drive system. The hysteresis controller also causes variable switching frequency that depends on operating conditions, especially...
The stable operation regions are the important issues for direct torque control (DTC) system of permanent magnet synchronous motor (PMSM). The influences of the parameters, such as voltage, current, flux linkage and load angle, on the system operation are investigated through the analysis model presented in this paper. The analysis results show that the parameters must be properly regulated within...
This paper investigates the harmonic voltage control strategy of direct torque control for five-phase induction generator (IG) system. In high/medium power applications, the generating function requires the performance of fast dynamic response, good static performance and high utilization of the dc bus voltage. For IG generating system, the direct torque control strategy has the advantages of easy...
Advanced machine control techniques, such as MPC and DB-DTFC, relies heavily on accurate machine parameters and inaccurate parameters can degrade control performance. Since machine parameters vary due to multiple factors, it is necessary to embed real-time parameter identification method into these control techniques. This paper is dedicated to exploring parameter identification method integrated...
This paper proposes an improved predictive torque control based on stator flux vector. By investigating the relationship among torque, the reference of stator flux magnitude and the phase angle of the stator flux, the reference vector of stator flux is designed. The desired deadbeat voltage vector is calculated based on the time delay compensation, which relieves the big calculation effort of conventional...
For the traditional direct torque control of induction motor, the ripple of flux linkage and torque is serious, and the inverter switching frequency is not constant. This paper proposes a deadbeat direct torque control strategy of induction motor. The control algorithm of speed identification based on model reference adaptive system is analyzed. By using back electromotive force as the error vectors...
The paper presents the development of a wind turbine emulator, which consists of an induction motor driven by a torque control inverter, and the dead-beat controller plays an important role in this structure. The wind turbine emulator system includes the dead-beat current controller, wind speed emulator, mathematical model of wind turbines, model of rotor blade characteristics, and model of tower...
In order to suppress unreasonable torque ripple of direct torque control (DTC) in surface permanent magnet synchronous motor (SPMSM), the SPMSM-DTC mode is established and the effect of voltage vectors selected by switching table on torque is analyzed. The conclusion of the change in torque is contrary to expectation when the changes of stator flux and torque angle (angle between stator and rotor...
The aim of this research work is to evaluate and compare the performances of the Direct Torque Control (DTC) and Predictive Torque Control (PTC) algorithms both applied to a three phase induction motor drive fed by three level reduced switch VSI. The comparison has been made based on the torque and current ripples, settling time, and response times during speed and load disturbances and Total Harmonic...
This paper proposes an algorithm for predictive torque control (PTC) of an induction motor drive that is simple to implement and also minimizes switching loss by efficient zero voltage vector placement. An algorithm for selecting the nearest zero vector is presented which can minimize switching losses. The proposed algorithm is analyzed in terms of torque ripple, current THD, dynamic performance for...
The paper describes how a Direct Torque Control (DTC) drive technology has been applied to provide improved torque control of a Flying Dividing Shear (FDS) system in a steel rolling mill. The control system has a supervisory level ensured by a Programmable Logic Controller (PLC). The FDS is a highly dynamic, high speed application load and requires a high performance torque control drive for the purpose...
Induction motor is utilized in wide area of electric drive applications. If sophisticated control of speed or torque is required, the actual rotor angular velocity must be known at every time instant. To obtain the speed information, an optical sensor is usually utilized. However, the usage of such sensor brings some undesired effects. The paper compares two very often used methods on a specific induction...
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