Papers by Keyword: Direct Torque Control (DTC)

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Authors: R. Dharmaprakash, Joseph Henry
Abstract: This paper proposes the natural extension of classic switching table based direct torque control of induction motor modified for 3-level diode clamped inverter. The proposed method has the advantages of fewer harmonic in the output and low torque ripples. The switching table direct torque control scheme is adopted due to the simplicity of its control algorithm. To demonstrate the performance of proposed multilevel inverter fed direct torque control, the simulations are carried out for constant speed under no load and step change in load. The comparison of the dynamic and steady state performance in terms of torque ripple of the 2-level inverter and 3-level inverters are presented.
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Authors: You Tao Zhao, Yan Cheng Liu, Jun Jie Ren
Abstract: In this paper the implementation of the vector control and direct torque control systems for a marine permanent magnet synchronous motor has been studied. A novel control method using space vector pulse width modulation was proposed. Then the simulation models with the vector control and direct torque control using the space vector pulse width modulation method have been established, respectively. Finally, the speed control performance of the systems was verified by simulation. The simulation results indicates that the systems used vector control or direct torque control technique can meet the requirements with the aspect of marine PMSM dynamic torque response. Meanwhile comparing to the different simulation results, the torque ripple was reduced in the vector control system.
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Authors: Shan Qiao, Jian Ying Xu, Bing Han
Abstract: This paper reports results of further investigation of the direct torque control to a permanent magnet synchronous motor drive. A variable parameters speed controller is proposed from the point of view of speed control to accelerate the dynamic response and increase the control precision and decrease the torque ripple of the system. It is presented that a reference flux vector calculation direct torque control system with a speed controller using different proportional and integral coefficients, and a novel torque-limiting method is recommended. The simulation results show that the control system can improve its performances and limit torque ripple effectively.
1510
Authors: Guo Lin Che, Hua Lai
Abstract: For getting the High-performance electric vehicle control which has good dynamic, static characteristics and robustness, a direct torque control strategy of fuzzy sliding mode variable structure was designed to IPM motor. The method changes torque ripple, speed overshoot, poor anti-disturbance ability of the conventional DTC, and weakened the serious chatting which existed in sliding mode variable structure control. The simulation results show the feasibility and effectiveness.
15
Authors: Song Lin Wang, Shun Yi Xie
Abstract: Because of the reliability requirement for the motor driving system in practical application, and based on analysis of the working principle of a fault-tolerant inverter, the direct torque control (DTC) for brushless direct current motor (BLDCM) fed by four-switch three-phases inverter (FSTPI) when the inverter faults is widely studied. According to the characteristics of (BLDCM), the voltage space vector for BLDCM-DTC fed by FSTPI is redefined due to the dissymmetric voltage space vector of TPFSI. To reduce the number of power device switching, the implementation method of four-switch SVPWM with seven-segment scheme was presented. Therefore, the system model is established as a result of the detailed analysis of voltage space vector and the control principle of the BLDCM-DTC without flux linkage observation fed by FSTPI. The validity and effectiveness of the proposed scheme have been verified through the simulation and experimental results.
697
Authors: Ying Pei Liu
Abstract: Although the structure of PI controller is simple, there are some flaws. In order to overcome the contradictions between the rapid response and overshoot for speed, the model of active disturbance rejection control (ADRC) was established in the paper. The transition process for a given speed was got by tracking - differentiator (TD). The sum of internal and external disturbance is estimated by the extended state observer (ESO). The capability of resisting disturbance is improved for the disturbance compensated timely. Permanent magnet synchronous motor (PMSM) direct torque control based on ADRC scheme is realized. The simulation results have shown its availability.
35
Authors: Wei Ran Wang, Xian Xing Liu, Hong Bo Wang, Xin Zhu
Abstract: Direct Torque Control (DTC) has an important role in current motor control. This paper focus on its torque ripple of the reference vector made, summarize a 5 levels structure and novel strategy. This strategy can generate one 5-level, sectors subdivision’s vector table and select the best vector to obtain the best effect. On this basis, combined with adapted genetic algorithm and calculate optimal parameters for the speed controller. In the end, give an example of induction motor. The results show that: the conclusion is correct, the control structure is simple, clear and perform significantly. It means that the strategy is feasibility and correct.
426
Authors: Song Lin Wang, Shun Yi Xie
Abstract: The key issue of feedback torque calculation in BLDCM-DTC system is how to get the accurate estimation of back-emf. The influences form the deviation of resistance and inductance on traditional back-emf sliding mode observer (SMO) and relevant torque observation results are analyzed. To advance the accuracy of the torque estimation, an adaptive sliding mode observer is designed to estimate the back-emf of the BLDCM and then get torque estimation from the back-emf estimation. The proposed sliding mode observer can also implement the online identification of the stator resistance and inductance simultaneously. Simulation results demonstrate the proposed method is valid and effective.
572
Authors: Zhe Ming Chen, Ren Luo
Abstract: As the result of wheel-rail surface conditions, external environment and vehicle speed change, the state of adhesion is changing. In order to ensure the validity and security of high speed train in braking, and obtain the maximum utilization of adhesion, control system must provide a stable and effective braking force. This paper presents a new pressure model of brake cylinder, and a 90 DOF vehicle dynamic model, uses Oldrich Polach’s model to calculate adhesion force, and adds a track irregularity on vehicle model. Switch signal controls brake cylinder. Direct torque strategy controls the induction motor, Recursive least squares determines the adhesion-slip state of wheels, Sliding mode control Strategy calculates the best braking force. The simulation results show the high brake performance of this wheel-slip prevention system, and the desired objective of control.
1074
Authors: Wei Zhang, Ping Zhang, Xin Hao Zhang, Xiao Feng Shen
Abstract: 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.
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