The Research of Direct Torque Control Based on Full-Dimensional State Observer

2012 ◽  
Vol 433-440 ◽  
pp. 1576-1581
Author(s):  
Shu Ping Xu ◽  
Shu Rong Wang ◽  
Xiao Hui Su
Keyword(s):  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
State Observer ◽  
State Equation ◽  
Torque Control ◽  
Structural System ◽  
Dc Offset ◽  
Assignment Algorithm ◽  
Stator Flux ◽  
Observation Method

To overcome integrator initial value, error accumulation and DC offset of pure integration, there proposed a permanent magnet synchronous motor stator flux observation method based on full-dimensional state observer. It uses the stator flux as state vector structural system state equation, the current as the output vector structural system output equation. And it configures the observer poles proportional to the motor model poles and use robust pole assignment algorithm in Matlab for observer gain matrix calculation. Experiments show that the full-dimensional observer on the stator flux observed has higher accuracy. The direct torque control system has better performance.

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.

Direct torque control of PMSM using sliding mode backstepping control with extended state observer

2016 ◽  
Vol 24 (4) ◽  
pp. 694-707 ◽  
Author(s):  
Bowen Ning ◽  
Shanmei Cheng ◽  
Yi Qin
Keyword(s):  
Sliding Mode ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
State Observer ◽  
Torque Control ◽  
Extended State Observer ◽  
System Stability ◽  
Extended State ◽  
Recursive Design ◽  
Exponential Reaching Law

Based on the nonlinear characteristics of permanent magnet synchronous motor (PMSM), a nonlinear speed and direct torque control (DTC) using sliding mode backstepping method for PMSM is presented in this paper. The sliding mode speed controller is implemented with exponential reaching law to improve the robustness of the system, and further a step-by-step recursive design for backstepping torque and flux controllers is presented. The system stability with proposed scheme is mathematically proved using Lyapunov stability criteria. At the same time, the load torque is observed with the extended state observer (ESO), and is fed-forward to the controller for rejecting the load disturbance and to mitigate the chattering affect due to the sliding mode controller. Finally, simulation test results are demonstrated to support the effectiveness and feasibility of the proposed strategy.

An Effective Direct Torque Control Based on Space Vector Modulation for DTP-PMSM

2013 ◽  
Vol 416-417 ◽  
pp. 480-485
Author(s):  
Wei Zhang ◽  
Ping Zhang ◽  
Xin Hao Zhang ◽  
Xiao Feng Shen
Keyword(s):  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Torque Ripple ◽  
Torque Control ◽  
Space Vector Modulation ◽  
Space Vector ◽  
Synchronous Reference Frame ◽  
Torque Control Strategy ◽  
Stator Flux ◽  
Vector Modulation

This paper has proposed an efficient direct torque control strategy based on space vector modulation (SVM-DTC) for dual three-phase permanent magnet synchronous motor (DTP-PMSM), which is implemented in a synchronous reference frame aligned with the machine stator flux vector. This strategy adopts the space vector modulation technique to compensate for the stator flux error, and then the continuous smooth response of the vector control and the rapid response of direct torque control are both achieved. Simulation studies of a 3KW DTP-PMSM are carried out. Simulation results show the improvement of the torque response, decrease of the torque ripple, the higher steady performance and better flux waveform.

High-Performance Speed Sensorless Direct Torque Control of PMSM

2011 ◽  
Vol 130-134 ◽  
pp. 2828-2831 ◽  
Author(s):  
Yan Ping Xu ◽  
Ke Guo ◽  
Yan Ru Zhong
Keyword(s):  
Kalman Filter ◽  
High Performance ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Torque Control ◽  
Flux Linkage ◽  
Speed Sensorless ◽  
Load Torque ◽  
Simulation Results ◽  
Stator Flux

A high-performance speed sensorless direct torque control (DTC) system of permanent magnet synchronous motor (PMSM) is presented in this paper. The stator flux linkage, speed, rotor position and load torque of PMSM are observed using a fourth-order Extended Kalman Filter (EKF) and a second-order Kalman Filter (KF) and the observed load torque is used for feed-forward compensation of reference torque. Simulation results clearly demonstrate the performance of speed can be improved when load torque is changed and the validity of the proposed control strategy.

Simulation Reach of Permanent Magnet Synchronous Motor System Based on Speed Sensor-Less Direct Torque Control

2014 ◽  
Vol 643 ◽  
pp. 32-36
Author(s):  
Meng Yuan Chen ◽  
Yue Dong Chen
Keyword(s):  
Permanent Magnet ◽  
Motor System ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Mathematic Model ◽  
Synchronous Motor ◽  
Torque Control ◽  
Speed Sensor ◽  
Response Performance ◽  
Stator Flux

The simulation model of permanent magnet synchronous motor system based on speed sensor-less direct torque control is built by analysing the mathematic model of permanent magnet synchronous motor and the theory of direct torque control in this dissertation, and the system’s speed and position is estimated by calculating the angle of stator flux linkage. MATLAB/Simulink is utilized to simulate the system, and the simulation results are analyzed, with which the simulation result prove the correctness and feasibility of the estimation using in this dissertation and good dynamic response performance of the system.

scholarly journals Direct Torque Control Of Permanent Magnet Synchronous Motor

2011 ◽  
pp. 27-30
Author(s):  
Anusha Mudili ◽  
P Devendra
Keyword(s):  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Current Control ◽  
Torque Control ◽  
Self Control ◽  
Control Mode ◽  
Flux Linkage ◽  
Matlab Program ◽  
Hysteresis Controller ◽  
Stator Flux

The DTC of PMSM is a kind of self control mode for its stator flux linkage and torque .It is very important that if stator flux linkage can be observed well and because the accuracy of the observer for stator flux linkage directly affects the performance of the DTC system of PMSM. In this paper ,for a torque drive with hysteresis controller in the current control loop will be implemented by writing a MATLAB program.

scholarly journals Performance Enhancement of Direct Torque-Controlled Permanent Magnet Synchronous Motor with a Flexible Switching Table

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1907 ◽  
Author(s):  
Ahmed Nasr ◽  
Chunyang Gu ◽  
Serhiy Bozhko ◽  
Chris Gerada
Keyword(s):  
Permanent Magnet ◽  
Performance Enhancement ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Simple Algorithm ◽  
Drive System ◽  
Torque Control ◽  
Permanent Magnet Synchronous Motors ◽  
Dynamic Performances ◽  
Stator Flux

In this paper, a flexible switching table (FST) for direct torque control (DTC) of permanent magnet synchronous motors (PMSMs) was proposed to enhance the steady-state and dynamic performances of the drive system. First, the influence of each converter output voltage vectors on the torque and stator flux deviation rates was analyzed to assess the voltage selection strategies of the conventional STs and their impact on the DTC system’s performance. Then, a new flexible ST was proposed which uses a simple algorithm to adaptively select the appropriate voltage vector for two of its states according to the system operating condition. The effectiveness and feasibility of the proposed FST were verified through a comparative evaluation with the conventional STs using experimental results obtained from a 0.75 kW PMSM drive system.

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