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This paper proposes the use of a 3-level Cascaded H-Bridge Multilevel Inverter (CHMI) topology which results in further torque ripple minimization compared to the 2-level inverter-based Direct Torque Control (DTC). This is due to the increase in the inverter switching voltage vectors that allows minimization of the torque error. This in turn can reduce the Total Harmonic Distortion (THD) of the output...
This paper presents a fuzzy logic controller (FLC) based direct torque control of induction motor (IM) drive to reduce the ripple in developed torque and stator flux. First the effect of amplitude of torque hysteresis band on the torque ripple of an IM motor is discussed. Finally, a strategy to reduce the ripple in the developed torque and stator flux is proposed by controlling the amplitude of the...
Among all control methods for induction motor drives, Direct Torque Control (DTC) seems to be particularly interesting being independent of machine rotor parameters and requiring no speed or position sensors. The DTC scheme is characterized by the absence of PI regulators, coordinate transformations, current regulators and PWM signals generators. In spite of its simplicity, DTC allows a good torque...
In contrast to conventional flux-weakening control methods, an algorithm based on operation times (T0) of zero voltage space vector for permanent magnet synchronous motor (PMSM) is proposed. In this paper, the d-axis current (id) is derived from a fuzzy controller. The proposed strategy can achieve fast dynamic control performance as well as parameter insensitivity in the flux-weakening region. Otherwise,...
ldquoThe design of this project for induction motor can transform the nonlinear torque-speed characteristics of induction motor to constant torque-speed characteristics similar to that of a DC motor.rdquo This project is meant to control the torque of induction motor using fuzzy logic controllers by Direct Torque Control (DTC). DTC method yields slow response during start up and change in either direction...
This paper presents the development and performance testing of a 2 loop resolution-level controlled (RLC) WM inverter-fed three-phase (3phi) squirrel-cage induction motor (IM) drive system. The proposed RLC WM inverter-fed IM drive is based on controlling the WM inverter output voltages using both a phase-shift thetas and the maximum value of the scale J. These two parameters are employed to adjust...
This paper presents a method for improving the torque ripple in permanent magnet synchronous motor (PMSM) drives under direct torque control (DTC) using a fuzzy logic controller (FLC). A DTC PMSM drive using conventional two and three states of torque error, and a FLC were simulated using the SimuLink package. The results showed that the DTC/FLC gives a better dynamic performance, regarding torque...
In this paper, an adaptive neural fuzzy inference system (ANFIS) is employed for the control of a PWM based direct torque control (DTC), driving a dual three-phase induction machine (DTPIM). DTPIM has two sets of three-phase windings spatially phase shifted by gamma (=60deg in this research) electrical degrees. The proposed control scheme uses a fuzzy inference system (FIS) to modulate the phase of...
Direct torque control based on space vector modulation (SVM-DTC) preserve DTC transient merits, furthermore, produce better quality steady-state performance in a wide speed range. In this paper, a torque fuzzy logic controller was designed to substitute the original torque PI controller, and a fuzzy SVM-DTC system based on the torque fuzzy controller was given. A new integration algorithm for estimating...
Principle of a new adaptive neuro-fuzzy inference system (ANFIS) with supervisory learning algorithm is introduced and is used to regulate the speed of a four-switch, three-phase inverter (FSTPI) brushless DC (BLDC) drive. The proposed algorithm has advantages of neural and fuzzy networks. To enhance of drive's performance, instead of well-known back propagation learning method, a fuzzy based supervisory...
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