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In this paper, methods for sizing of PV pumping systems and the simulation of (DTC) Direct Torque Control of induction motor that is used for piloting a water pump supplied by a photovoltaic generator are presented. The sizing of the PV pumping system is based on the calculation of the water needs, the required hydraulic energy and the estimation of available solar power. The best sizing of the PV...
The direct torque control (DTC) strategy is one of the most performance methods for induction machine (IM) drive torque control. The controlled stator magnetic flux and torque cannot be easily measured and therefore must be calculated using an IM mathematical model. This paper examines the impact of the replacement the original voltage IM model by Luenberger observer on the drive performance. As the...
This paper presents a comparison between Field Oriented Control and Direct Torque Control methods of a Matrix Converter-fed (MC) Permanent Magnet Synchronous Motor (PMSM). MC is becoming widely used because of the unity power factor and the lack of energy storage element. FOC method calculates the duty of MC states with use of geometric relations between voltage and current vectors. DTC method, on...
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...
This paper presents a new technique to minimize the torque ripples inherited in DTC of induction motor. The typical discrete-based DTC imposes delay time which frequently allows the torque to overshoot beyond hysteresis bands. This triggers the selection of reverse voltage vectors which, in turn, cause large torque decrements. The torque ripples become of great significance at low speeds where torque...
The AC drives direct torque control (DTC) is used to obtain high performance decoupled torque and flux control. The SVM based direct torque control is a common solution which used to solve the conventional DTC's problems such as the high torque ripples and variable switching frequency. However, this control technique bases on stator flux orientation and PI controllers. This paper aims to improve the...
Direct Torque Control is a control technique in AC drive systems to obtain high performance torque control. The conventional DTC utilizing hysteresis comparators suffers from high torque ripples and variable switching frequency. The most common solution to those problems is to use the space vector modulation. In this paper a modified direct torque control of induction motor scheme is presented. The...
We can consider the direct torque control (DTC) as an alternative to conventional methods of control by pulse width modulation (PWM) and by Field oriented control (FOC), the direct torque control DTC found by Takahashi offers high performance in terms of simplicity in control and fast electromagnetic torque response. With dominant characteristics, the direct torque control controlled AC electric motor...
The paper presents properties and control methods of grid-connected doubly-fed induction generator (DFIG). The paper is focused on unbalanced grid operation, because presently it is the biggest challenge for this type of generator. There are discussed three most popular methods - direct power control, direct torque control, and vector control with proportional-resonant PR controllers of rotor current...
The direct torque control of induction motor has good dynamic performance of torque and flux. However, the switching frequency is variable and difficult to control due to the use of hysteresis controllers. That is the origin of torque and flux ripples. And the use of a two levels voltage inverter limits the drive system power. To overcome these problems, we propose to study in this paper a modified...
This paper presents the brushless DC (BLDC) motor drive with direct torque control (DTC) for a washing machine over variable speed range. The system hardware and software programming are analyzed and designed. The flux controller and torque controller are derived and realized accordingly. A prototype of BLDC motor drive based on the DSP controller with DTC control is implemented and validated by the...
In this research, a Fuzzy Logic Direct Torque Control (FLDTC) based on stator flux-oriented and machine's relation and equations with voltage and current of both stators have been introduced. Initially, paper focuses on BDFM concept and development of it. The synchronous mode operation of BDFM will be studied, and then by introducing the d-q coordination, the dynamic equation of BDFM will be represents...
In this paper, a modified Kalman filter is proposed to estimate speed. At first, the influence of the magnetic saturation is taken into account in the modelling. In the second part, the direct torque control (DTC) is elaborated; the control of the speed loop is ensured by an IP controller, the flux and the torque are estimated from source voltages and measured currents. The last part of this work...
Considering the disadvantages of torque ripple and current distortion on traditional direct torque control (DTC) of induction motor, a new direct torque control strategy based on predicting the stator voltage vector is presented in this paper. The stator voltage prediction control scheme estimates the desirable stator voltage of the next cycle by the current state value and the desirable flux and...
After establishing the permanent magnetism synchronous machine (PMSM) twelve sectors direct torque control (DTC) platform, in this paper, the relation between torque and minimum stator currents while maximum torque per ampere (MTPA) is deduced using Lagrange multiplier method, and the optimal excitation current is obtained using the curve fitting method, and then the optimal stator flux instruction...
After establishing the 12 sectors direct torque control (DTC) platform of permanent magnetism synchronous machine (PMSM), in this paper, we established the smallest loss model by calculating the copper and iron loss of PMSM, and then promoted the system efficiency by calculating the optimal field current and instruction value of stator flux linkage. Simulation experiments show that the new scheme...
This paper presents a direct torque control technique for Brushless DC motors with non-sinusoidal back electromotive force. Direct torque control has some benefits such as faster torque response and reduced torque ripple for driving the Brushless DC motors. The Sliding mode observer, which is robust to parameter uncertainties, can be used to estimate the back-EMF and generate the torque. It is employed...
In this paper, a direct torque control (DTC) of encoderless Synchronous Reluctance Motor (SynRM) drives is proposed based on emotional controller and space vector modulation. The proposed modern controller is called brain emotional learning based intelligent controller (BELBIC). The utilization of BELBIC is based on the emotion processing mechanism in brain, and is essentially an action, which is...
Multiphase electric drives have been recently proposed for applications where the highest overall system reliability, combined with a reduction in the total power per phase, are required. Strategies like Field Oriented Control (FOC) and Direct Torque Control (DTC) have been traditionally used in these high performance applications. In this paper, a Predictive Torque Control (PTC) method is introduced...
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...
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