Minimum Voltage Vector Error Based Direct Torque Control for Induction Motors

2021 ◽  
Vol 9 (8) ◽  
pp. 2182-2188
Author(s):  
Hrushikesh V. Bihade
Keyword(s):  
Induction Motors ◽  
Direct Torque Control ◽  
Vector Current ◽  
Torque Control ◽  
Duty Ratio ◽  
Switching Frequency ◽  
Vector Error ◽  
Voltage Vector ◽  
Torque Response ◽  
Torque Ripples

Abstract: Traditional DTC popular because of its simplicity, Robustness, and first torque response. However, it is associated by high THD, large torque ripples and variable switching frequency. Which leads the way to scope of research in traditional DTC drive. thus, to further raise the performance, a method based on minimum voltage vector error is proposed in this dissertation. To cut down the error value between voltage vector imposed on the machine terminal and reference voltage vector, the value of Duty ratio is effectively optimized by propose method. The Optimization process does not increase the complexity of method. The proposed method is simulated in MATLAB environment. Keywords: TDTC, MVE DTC, Torque ripples, voltage-vector, current THD

Modified Look-Up Table for Enhancement of Torque Response in Direct Torque Controlled Induction Machine

2017 ◽  
Vol 8 (2) ◽  
pp. 522
Author(s):  
Goh Wee Yen ◽  
Nik Rumzi Nik Idris ◽  
Auzani Jidin ◽  
Tole Sutikno
Keyword(s):  
Direct Torque Control ◽  
Induction Machine ◽  
Drive System ◽  
Torque Control ◽  
Duty Ratio ◽  
Activation Time ◽  
Light Load ◽  
Look Up Table ◽  
Voltage Vector ◽  
Torque Response

Basically, the direct torque control (DTC) drive system is operated at light load. At light load, supplying the drive system with rated flux will decrease the efficiency of the system. To maximize the efficiency of drive system, an optimal flux has been applied during steady-state but when a torque is suddenly needed, for example during acceleration, the dynamic of the torque response would be degraded. Therefore, a modification to the voltage vector as well as look-up table has been proposed for the torque response improvement. The proposed voltage vector is generated by adding two adjacent conventional voltage vectors and implemented by using duty ratio. The duty ratio is used to estimate the activation time of each conventional voltage vector in order to produce the proposed voltage vector.

scholarly journals Simulation Study of Two Torque Optimization Methods for Direct Torque-Controlled Induction Motors

2019 ◽  
Vol 9 (24) ◽  
pp. 5547
Author(s):  
Hani Albalawi ◽  
Sherif A. Zaid ◽  
Yonis M. Buswig
Keyword(s):  
Induction Motors ◽  
Dynamic Performance ◽  
Direct Torque Control ◽  
Optimization Methods ◽  
Torque Control ◽  
The Other ◽  
Voltage Vector ◽  
Torque Response ◽  
Parameter Variations ◽  
Dynamic Performances

The simplicity and excellent dynamic performance of Direct Torque Control (DTC) make Induction Motor (IM) drives attractive for many applications that require precise torque control. The traditional version of DTC uses hysteresis controllers. Unfortunately, the nature of these controllers prevents the optimization of the inverter voltage vectors inside the flux hysteresis band. The inverter voltage vector optimization can produce fast torque response of the IM drive. This research proposes two torque optimization methods for IM systems utilizing DTC. Analysis and Matlab simulations for the proposed optimization methods prove that the torque and, consequently, the speed responses, are greatly improved. The performances of the drive system controlled by the proposed optimization methods and the traditional DTC are compared. Conversely, the effects of the parameters on the proposed optimization methods are introduced. The proposed methods greatly improve the torque and speed dynamic performances against the traditional DTC technique. However, one of the proposed optimization methods is more sensitive to IM parameter variations than the other.

Bus-Clamping Based Improved Discrete Duty Ratio Control Technology of Direct Torque Control for Induction Motors

2014 ◽  
Vol 541-542 ◽  
pp. 1177-1184
Author(s):  
Hong Xia Yu ◽  
Chuang Li
Keyword(s):  
Induction Motors ◽  
Direct Torque Control ◽  
Torque Ripple ◽  
Torque Control ◽  
Control Technique ◽  
Duty Ratio ◽  
Voltage Vector ◽  
Speed Range ◽  
Zero Voltage

One of the disadvantages of traditional direct torque control is high torque ripple, A method of reduce torque ripple was proposed basing bus-clamping and duty ratio control technique in this paper. Firstly, the switch vector table with bus-clamping technology was improved by analyzing the role of zero voltage vector to reduce torque ripple in different sector of voltage. Secondly, on the base of combing the improved bus-clamping direct torque control (BCDTC) and discrete duty ratio control (DDRC), a new switch vector table with discrete duty ratio and bus clamping was designed by analyzing the role of zero voltage vector to reduce torque ripple in different speed range. Finally, simulations are performed to verify the proposed strategies.

Direct Torque Control for Induction Motors Based on Minimum Voltage Vector Error

2020 ◽  
pp. 1-1
Author(s):  
Xu Wu ◽  
Wenxin Huang ◽  
Xiaogang Lin ◽  
Wen Jiang ◽  
Yong Zhao ◽  
...  
Keyword(s):  
Induction Motors ◽  
Direct Torque Control ◽  
Torque Control ◽  
Vector Error ◽  
Voltage Vector

Sensorless finite-state predictive torque control of induction motor fed by four-switch inverter using extended Kalman filter

2018 ◽  
Vol 37 (6) ◽  
pp. 2006-2024 ◽  
Author(s):  
Mohamed Chebaani ◽  
Amar Goléa ◽  
Med Toufik Benchouia ◽  
Noureddine Goléa
Keyword(s):  
Kalman Filter ◽  
Induction Motor ◽  
Extended Kalman Filter ◽  
Direct Torque Control ◽  
Operating Conditions ◽  
Torque Control ◽  
Switching Frequency ◽  
Content Type ◽  
Finite State ◽  
Torque Ripples

Purpose Direct Torque Control (DTC) of induction motor drives is a well-established technique owing to features such as fast dynamic and insensibility to motor parameters. However, conventional DTC scheme, based on comparators and the switching table, suffers from large torque and flux ripples. To improve DTC performance, this study aims to propose and implement a sensorless finite-state predictive torque control using extended Kalman Filter in dSPACE environment. Design/methodology/approach This paper deals with the design of an extended Kalman filter for estimating the state of an induction motor model and for sensorless control of systems using this type of motor as an actuator. A complex-valued model is adopted that simultaneously allows a simpler observability analysis of the system and a more effective state estimation. Findings Simulation and experimental results reveal that the drive system, associated with this technique, can effectively reduce flux and torque ripples with better dynamic and steady state performance. Further, the proposed approach maintains a constant switching frequency. Originality/value The proposed speed observer have been developed and implemented experimentally under different operating conditions such as parameter variation, no-load/load disturbances and speed variations in different speed operation regions.

Research on Ripples Reduction of Flux Linkage and Torque for DTC

2012 ◽  
Vol 614-615 ◽  
pp. 1570-1573
Author(s):  
Ying Pei Liu ◽  
Ran Li ◽  
Zhi Chao Zhang
Keyword(s):  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Torque Control ◽  
Switching Frequency ◽  
Space Vector Modulation ◽  
Flux Linkage ◽  
Simulation Results ◽  
Vector Modulation ◽  
Torque Ripples ◽  
Fast Dynamic

In order to reduce the ripples of flux linkage and torque for direct torque control (DTC) and ensure constant inverter switching frequency, permanent magnet synchronous motor (PMSM) DTC based on space vector modulation (SVM) and extended Kalman filter (EKF) is researched in the paper. Simulation results have shown that the inherent advantages of fast dynamic response of DTC are maintained, and flux linkage and torque ripples are effectively reduced. Speed is estimated accurately, and sensorless operation is realized.

scholarly journals Minimization of Torque Ripple in DTC of Induction Motor Using Fuzzy Mode Duty Cycle Controller

2011 ◽  
Vol 7 (1) ◽  
pp. 42-49
Author(s):  
Turki Abdalla ◽  
Haroution Hairik ◽  
Adel Dakhil
Keyword(s):  
Induction Motor ◽  
Duty Cycle ◽  
Direct Torque Control ◽  
Torque Ripple ◽  
Operating Conditions ◽  
Torque Control ◽  
Voltage Source ◽  
Ratio Method ◽  
Duty Ratio ◽  
Switching Frequency

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 control in steady state and transient operating conditions to be obtained. However, the presence of hysterics controllers for flux and torque could determine torque and current ripple and variable switching frequency operation for the voltage source inverter. This paper is aimed to analyze DTC principles, and the problems related to its implementation, especially the torque ripple and the possible improvements to reduce this torque ripple by using a proposed fuzzy based duty cycle controller. The effectiveness of the duty ratio method was verified by simulation using Matlab/Simulink software package. The results are compared with that of the traditional DTC models.

scholarly journals A Novel Finite-Control-Set Model Predictive Directive Torque Control Strategy of Permanent Magnet Synchronous Motor with Extended Output

Electronics ◽  
2019 ◽  
Vol 8 (4) ◽  
pp. 388 ◽  
Author(s):  
Mingxing Du ◽  
Ye Tian ◽  
Wenbai Wang ◽  
Ziwei Ouyang ◽  
Kexin Wei
Keyword(s):  
Control Strategy ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Torque Control ◽  
Voltage Vector ◽  
Torque Control Strategy ◽  
Finite Control ◽  
Control Set ◽  
Verification Test ◽  
Torque Ripples

The performance of conventional direct torque control strategy from the viewpoint of flux and torque ripples has been unsatisfactory. Therefore, this study aims to propose a novel finite-control-set model predictive direct torque control strategy with extended output based on two-step prediction. An appropriate pre-selected vector, which is modulated in a specific manner, is selected through a look-up table and then used to optimise the pre-selected voltage vector based on the computing result from the model prediction and output it. The proposed strategy extends the range of the vectors that can be used to enhance the flux and torque control performance and reduce ripples and computational complexity in comparison with the conventional finite-control-set model predictive direct torque control. The feasibility of the proposed method is verified by conducting a verification test using dSPACE and Tyhpoon HIL 402 experimental platform.

Research on the Influence of Zero Space Voltage Vectors on Direct Torque Control of PMSM

2011 ◽  
Vol 383-390 ◽  
pp. 2628-2635
Author(s):  
Yu Ying Gao ◽  
Ming Ji Liu ◽  
De Ping Kong ◽  
Yun Gao Li
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Control Model ◽  
Torque Control ◽  
Switching Frequency ◽  
Switching Loss ◽  
Torque Response ◽  
Power Switches ◽  
Simulation Results

Direct torque control (DTC) has been widely used due to its advantages of less parameter dependence and faster torque response. However, in conventional DTC, there are obvious torque and flux ripples. This paper studies the influence of zero space voltage vectors on DTC system of permanent magnet synchronous motor (PMSM). The control model is established with Matlab/Simulink software. The simulation results show that the ripple torque can be reduced significantly when zero space voltage vectors are used. Meanwhile, the use of zero space voltage vectors can evidently decrease the switching frequency of the power switches as well as the switching loss. The achievements in this paper can provide a reference to improve DTC performance of PMSM.

High-Performance Computing Using FPGAs for Improving the DTC Performances of Induction Motors

2020 ◽  
pp. 133-153
Author(s):  
Saber Krim ◽  
Mohamed Faouzi Mimouni
Keyword(s):  
Digital Signal Processor ◽  
High Performance ◽  
Induction Motors ◽  
Control Method ◽  
Direct Torque Control ◽  
Digital Signal ◽  
Sampling Frequency ◽  
Torque Control ◽  
Field Programmable ◽  
Torque Ripples

The conventional direct torque control (DTC) of induction motors has become the most used control strategy. This control method is known by its simplicity, fast torque response, and its lack of dependence on machine parameters. Despite the cited advantages, the conventional DTC suffers from several limitations, like the torque ripples. This chapter aims to improve the conventional DTC performances by keeping its advantages. These ripples depend on the hysteresis bandwidth of the torque and the sampling frequency. The conventional DTC limitations can be prevented by increasing the sampling frequency. Nevertheless, the operation with higher sampling frequency is not possible with the software solutions, like the digital signal processor (DSP), due to the serial processing of the implemented algorithm. To overcome the DSP limitations, the field programmable gate array (FPGA) can be chosen as an alternative solution to implement the DTC algorithm with shorter execution time. In this chapter, the FPGA is chosen thanks to its parallel processing.

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