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In this paper, an optimal switching table for PMSM DTC system using zero voltage vector is proposed. Zero voltage vector decreases stator flux and torque very slowly, so it can be used to suppress torque ripple when the system is at steady-state. And when the system is at dynamic-state, non-zero voltage is used to get quicker response. As both 111 and 000 can be used to generate zero voltage vector,...
In this paper, voltage vector selection for the direct torque control (DTC) for surface permanent magnet synchronous motor (SPMSM) based on predictive control is proposed. Firstly, based on increasing or decreasing effects of the applying voltage vector on the amplitude of stator flux and torque of SPMSM, the proper voltage vector selection area of the DTC for SPMSM is given. Then predictive control...
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 the advantage of implementing a novel Hexagonal Flux Control Method to improve constant switching performance of multilevel 3-phase DTC scheme. The Direct Torque Control (DTC) scheme is well known to provide rapid decoupled control of torque and flux in motor control drive via a simple control structure. The utilization of 3-level CHMI in this DTC can minimize the output torque...
This paper presents the advantage of using optimal PI parameter tuning strategy of constant switching method in the three phase Direct torque control (DTC) scheme. The DTC system is known to offer fast decoupled control of torque and flux via a simple control structure. Nevertheless, DTC system has two major drawbacks, which are the variable inverter switching frequency and high torque output ripple...
This paper presents the advantage of Torque Error Modulator (TEM) implementation in conventional Direct Torque Control (DTC) of 3-phase induction motor with 3-level Cascade H-bridge Multilevel Inverter (CHMI). The DTC system is known to offer fast decoupled control of torque and flux via a simple control structure. Nevertheless, DTC system has two major drawbacks, which are the variable inverter switching...
The stator flux and electromagnetic torque are directly controlled in a DTC system using space vector modulation technique. In DTC, torque and flux ripples increases at low speeds. A DTC-SVM induction motor drive at very low speeds is investigated here and High Frequency Signal Injection (HFSI) method is adopted to mitigate the low speed issues. In this method a sinusoidal wave of small amplitude...
Due to control simplicity and easy applicability DTC has become popular and adopted in many industrial applications. But it still suffers from a few drawbacks like- comparatively large torque ripple in a low speed range and its performance is highly depended on speed of the motor and hysteresis bands of torque and flux ripple. To address these problems, this paper represents a direct torque control...
This paper presents a performance of three-level inverter Neutral Point Clamped (NPC) structure fed induction machine. The proposed topology is an emerging technology and is commonly applied to high power motion drives instead of the standard two-level voltage source inverters (VSI). However, it has an inherent problem of neutral point potential variation. In this way, a Direct Torque Control (DTC)...
In this paper, an optimal reference stator flux strategy is proposed to improve the drive system efficiency under direct torque control (DTC) and DTC with space vector modulation (SVM) strategies. A low cost (LC) interior permanent magnet synchronous machine (IPMSM) is introduced and tested. Based on the easily implementable loss model control (LMC), the controllable electrical losses which consist...
Direct Torque Control (DTC) method is an excellent technique for torque and flux control for a brushless doubly-fed reluctance machine (BDFRM). The advantages of the DTC method are simple implementation, fast response and little dependence on the machine parameters. However, the conventional DTC method has high torque and flux ripple and variable switching frequency problems. This paper proposes an...
Direct torque control (DTC) of five-phase PMSMs has been investigated in many literatures. Besides many advantages of this method, large harmonic currents is one the major drawbacks of this scheme. Space vector modulation (SVM) methods have been applied to DTC algorithm to eliminate this problem. But it should be mentioned that SVM methods have complicated calculations. This paper proposes a simple...
This paper presents a modified fuzzy controller for direct torque control (DTC) of induction motor capable of reducing the steady state error. The drive is also robust to load disturbance while not resorting to complicated control method. The proposed modified fuzzy logic controller (MFLC) consists of proportional-integral (PI) controller at steady state, PI-type fuzzy logic controller (PI-type FLC)...
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...
Vector control is employed in induction motor drives to provide a fast torque response. Various vector control methods have been proposed before, among which Direct Torque Control provides high dynamic performance with very simple control scheme. Basic DTC scheme is based on hysteresis control of flux and torque. The dynamic torque performance is very important in traction and electric vehicle applications...
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...
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...
This paper presents a simple dynamic overmodulation method to obtain a fast dynamic torque response in DTC of induction machines with constant switching frequency controller. A fast dynamic torque response can be obtained by switching only the most optimized voltage vector during torque dynamic condition. The optimized voltage vector can be identified by comparing the rate of change of torque produced...
Higher dv/dt and neutral point voltage floating often occur at the common three-level inverter, therefore, the modified modulate strategy is first studied for an induction motor system (IM) fed by a three-level inverter to implement direct torque control (DTC), and then the SIMULINK model is set up for the direct torque controlled induction motor system fed by the modified three-level inverter's modulate...
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