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In the present work a novel strategy for optimum design of flux and torque controller for carrier space vector pulse width modulation based direct torque control (CSVPWM DTC) of induction motor (IM) drive has been implemented. Two positive and one negative torque slope levels per half the switching period has been predicted for CSVPWM DTC IM drive based on which a new optimal control strategy is proposed...
This paper presents a direct torque control method for doubly-fed induction generator (DFIG) based wind power generation systems. The angle and magnitude of rotor voltage are controlled to achieve independent control of electromagnetic torque and reactive power respectively. Space vector modulation is used to address the limitations like, variable switching frequency and torque ripple, of hysteresis...
Permanent magnet synchronous motors (PMSM) are appropriate for applications with load-independent speeds or synchronous operation with high accuracy under defined speed. In this paper analysis the structure and equations of the PMSM, direct torque control (DTC) and voltage space vector process then study model reference adaptive system (MRAS) estimators. The PI controller uses from estimate speed...
This paper presents an implementation of deadbeat-direct torque and flux control (DB-DTFC) for AC induction machine drives that demonstrates nearly ideal properties over a wide range of flux and torque operating conditions, including deep field weakening. A key attribute of this DB-DTFC is that the control law is the same over the entire operating space, including steady-state and transient operation...
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...
Present work shows the merits of space vector modulation direct torque control(SVM-DTC) over the conventional direct torque control(conventional DTC). SVM-DTC technique is helpful in solving the basic issues of torque ripple and variable swithing frequency present in the conventional DTC. In order to get the reference voltage vector which is necessary for the SVM-DTC, this paper describes a method...
The Direct Torque Control (DTC) with Space Vector Modulation (SVM) and Self-Tuning PI-Type Fuzzy (STPIF) controller is proposed. This controller determines dynamically the load angle between stator and rotor flux vectors and in consequence the electromagnetic torque necessary to supply the motor load. The rule base for STPIF controller is defined in function of the error “e” and the change of the...
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...
Firstly, to minimize the ripples of the electric magnetic torque and flux linkage produced in the conventional direct torque control (DTC) system for permanent magnet synchronous motors (PMSM); this paper proposes a expected space vector modulation (ESVM) strategy of DTC. The expected voltage was produced by SVM. PI controller was used in flux and torque controller, instead of hysteresis comparator...
In this paper, a flexible DTC based on variable structure approach and space vector modulation is presented for encoderless Synchronous Reluctance Motor (SynRM) Drives. According to this method, a sliding mode-plus-PI controller is designed for torque and flux control in stator flux reference frame, respectively. The proposed controller is able to reduce the torque, flux, current and speed pulsations...
Since there's a biggish output ripple in current direct torque's control, we design a direct torque control system for three-level inverters used in asynchronous motors by analyzing the operational principle of the diode clamped three-level inverters, and simulation is done as well. Ripples of the torque and the rotational speed of the motor can be deduced effectively, and a stable output and a good...
In this paper, three significant control methods for permanent magnet synchronous machine are presented. A new control method enjoys the advantages of vector control and direct torque control is proposed. This method avoids some of the implementation difficulties of either of the two control methods. The proposed control method using the same flux and torque estimators as for the basic DTC and the...
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...
The most important part of the direct toque control for five-phase PMSM is to select the appropriate voltage vectors. This paper develops two methods for this. First the PI control method is used to decide the reference voltage vector and second the way for selecting proper voltage vectors to synthesize the reference voltage vector in order to minimize the effection of harmonics current is gived....
A novel direct torque control strategy, using genetic algorithm on-line to optimize the fuzzy PI controller, is proposed. In this approach, according to speed error and its first time derivative, the proportional coefficient Kp and integral coefficient Ki can be on-line adjusted by fuzzy adaptive PI speed regulation, and the fuzzy logic adapter parameters are optimized by genetic algorithm to improve...
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...
Direct torque control (DTC) is considered as the best alternative for permanent magnet synchronous (PMSM) drives. Classic switching-table based DTC has high torque and flux ripple due to the implementation of hysteresis control. Switching frequency can be made constant by replacing hysteresis control with space vector PWM (SVM) and requires mathematical modification on SVM input. Propotional+integral...
This paper presents a direct torque control (DTC) scheme using space vector modulation (SVM) to achieve high performance speed control of a permanent magnet synchronous motor. Based on the concept of a field-oriented control principle, a Proportional-integral (PI) flux controller is first established to achieve fast direct flux control and then cascade schemes of PI torque and speed controllers are...
A new direct torque control (DTC) strategy of induction motors based on double-fuzzy space vector modulation (SVM) was proposed. In conventional SVM-DTC, two PI controllers were used to generate reference voltage vector. The parameters of PI controller are difficult to determine. In order to improve away the disadvantages of conventional SVM-DTC system, flux and torque fuzzy controller were designed...
This paper presents the application of a sensorless direct torque control (DTC) for an induction motor, using an improved H-Bridge multilevel inverter with 27-Levels. The inverter topology reduces the power sources from nine to only four active sources and three ultracapacitors. The power sources are unidirectional and non-redundant; scaled in power of three to optimize the number of voltage levels...
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