Low-speed performance improvement of direct torque control and simulation validation

2013 ◽  
Author(s):  
Gao Junshan ◽  
Lu Xinmeng ◽  
Wang Yue
Keyword(s):  
Performance Improvement ◽  
Direct Torque Control ◽  
Torque Control ◽  
Low Speed ◽  
Simulation Validation ◽  
Speed Performance

scholarly journals Low-Speed Performance Improvement of Direct Torque Control for Induction Motor Drives Fed by Three-Level NPC Inverter

Electronics ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 77 ◽  
Author(s):  
Samer Hakami ◽  
Ibrahim Mohd Alsofyani ◽  
Kyo-Beum Lee
Keyword(s):  
Induction Motor ◽  
Direct Torque Control ◽  
Basic Structure ◽  
Motor Drives ◽  
Torque Control ◽  
Low Speed ◽  
Speed Performance ◽  
Sinusoidal Current ◽  
Stator Flux ◽  
Stator Resistance

Classical direct torque control (DTC) is considered one of the simplest and fastest control algorithms in motor drives. However, it produces high torque and flux ripples due to the implementation of the three-level hysteresis torque regulator (HTR). Although, increasing the level of HTR and utilizing multilevel inverters has a great contribution in torque and flux ripples reduction, stator flux magnitude of induction motor (IM) droops at every switching sector transition, particularly at low-speed operation. This problem occurs due to the utilization of a zero voltage vector, where the domination of stator resistance is very high. A simple flux regulation strategy (SFRS) is applied for low-speed operation for DTC of IM. The proposed DTC-SFRS modifies the output status of the five-level HTR depending on the flux error, torque error, and stator flux position. This method regulates the stator flux for both forward and reverse rotational directions of IM with retaining the basic structure of classical DTC. By using the proposed algorithm, the stator flux is regulated, hence pure sinusoidal current waveform is achieved, which results in lower total harmonics distortion (THD). The effectiveness of the proposed DTC-SFRS is verified through simulation and experimental results.

Research of Tornambe Control in the Speed Regulation of Induction Motor System

2015 ◽  
Vol 734 ◽  
pp. 277-280
Author(s):  
Jun Mei Zhao ◽  
Zhi Jie Zhang ◽  
Yi Feng Ren
Keyword(s):  
Induction Motor ◽  
Direct Torque Control ◽  
Response Speed ◽  
Torque Control ◽  
System Response ◽  
Low Speed ◽  
Speed Regulation ◽  
Torque Control Strategy ◽  
Speed Performance ◽  
Speed Regulator

Induction motor (IM) is a complex controlled object that is difficult to drive and control. In this paper, direct torque control strategy (DTC) is adopted to drive IM. In order to overcome drawbacks of the bad low speed performance of DTC system, Tornambe control (TC) is used to replace the traditional speed regulator to improve system performance. The results show that TC strategy overcomes the disadvantage of the low speed performance declined and improves the response speed of DTC system, and effectively solves the contradiction between the system response speed and overshoot.

scholarly journals Performance Improvement of Servo Control System Driven by Novel PMSM-DTC Based On Fixed Sector Division Criterion

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2154 ◽  
Author(s):  
Dazhi Wang ◽  
Tianqing Yuan ◽  
Xingyu Wang ◽  
Xinghua Wang ◽  
Yongliang Ni
Keyword(s):  
Control System ◽  
Performance Improvement ◽  
Error Compensation ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Torque Control ◽  
Servo Control ◽  
Flux Linkage ◽  
Servo Control System ◽  
Stator Flux

In order to improve the performance of the servo control system driven by a permanent magnet synchronous motor (PMSM) under novel direct torque control (NDTC), which, utilizing composite active vectors, fixed sector division criterion, is proposed in this paper. The precondition of the accurate compensations of torque and flux errors is that the sector where the stator flux linkage is located can be determined accurately. Consequently, the adaptive sector division criterion is adopted in NDTC. However, the computation burden is inevitably increased with the using of the adaptive part. On the other hand, the main errors can be compensated through SV-DTC (DTC-utilizing single active vector), while another active vector applied in NDTC can only supply the auxiliary error compensation. The relationships of the two active vectors’ characteristics in NDTC are analyzed in this paper based on the active factor. Furthermore, the fixed sector division criterion is proposed for NDTC (FS-NDTC), which can classify the complexity of the control system. Additionally, the switching table for the selections of the two active vectors is designed. The effectiveness of the proposed FS-NDTC is verified through the experimental results on a 100-W PMSM drive system.

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