• 제목/요약/키워드: Deadbeat direct torque control

검색결과 6건 처리시간 0.129초

Low Parameter Sensitivity Deadbeat Direct Torque Control for Surface Mounted Permanent Magnet Synchronous Motors

  • Zhang, Xiao-Guang;Wang, Ke-Qin;Hou, Ben-Shuai
    • Journal of Power Electronics
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    • 제17권5호
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    • pp.1211-1222
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    • 2017
  • In order to decrease the parameter sensitivity of deadbeat direct torque control (DB-DTC), an improved deadbeat direct torque control method for surface mounted permanent-magnet synchronous motor (SPMSM) drives is proposed. First, the track errors of the stator flux and torque that are caused by model parameter mismatch are analyzed. Then a sliding mode observer is designed, which is able to predict the d-q axis currents of the next control period for one-step delay compensation, and to simultaneously estimate the model parameter disturbance. The estimated disturbance of this observer is used to estimate the stator resistance offline. Then the estimated resistance is required to update the designed sliding-mode observer, which can be used to estimate the inductance and permanent-magnetic flux linkage online. In addition, the flux and torque estimation of the next control period, which is unaffected by the model parameter disturbance, is achieved by using predictive d-q axis currents and estimated parameters. Hence, a low parameter sensitivity DB-DTC method is developed. Simulation and experimental results show the validity of the proposed direct control method.

Improved Direct Torque Control for Sensorless Matrix Converter Drives with Constant Switching Frequency and Torque Ripple Reduction

  • Lee Kyo-Beum;Blaabjerg Frede
    • International Journal of Control, Automation, and Systems
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    • 제4권1호
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    • pp.113-123
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    • 2006
  • In this paper, an improved direct torque control (DTC) method for sensorless matrix converter drives is proposed which enables to minimize torque ripple, to obtain unity input power factor, and to achieve good sensorless speed-control performance in the low speed operation, while maintaining constant switching frequency and fast torque dynamics. It is possible to combine the advantages of matrix converters with the advantages of the DTC strategy using space vector modulation and a flux deadbeat controller. To overcome the phase current distortion by the non-linearity of a matrix converter drive, the simple non-linearity compensation method using PQR power theory are presented in the proposed scheme. Experimental results are shown to illustrate the feasibility of the proposed strategy.

Direct Stator Flux Vector Control Strategy for IPMSM using a Full-order State Observer

  • Yuan, Qingwei;Zeng, Zhiyong;Zhao, Rongxiang
    • Journal of Electrical Engineering and Technology
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    • 제12권1호
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    • pp.236-248
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    • 2017
  • A direct stator flux vector control scheme in discrete-time domain is proposed in this paper for the interior permanent magnet synchronous motor (IPMSM) drive to remove the proportional-integral (PI) controller from the direct torque control (DTC) scheme applied to IPMSM and to obtain faster dynamic response and lower torque ripple output. The output of speed outer loop is used as the desired torque angle instead of the desired torque in the proposed scheme. The desired stator flux vector in dq coordinate is calculated with a given amplitude. The state-space equations in discrete-time for IPMSM are established, the actual stator flux vector is estimated in deadbeat manner by a full-order state observer, and then the closed-loop control is achieved by the pole placement. The stator flux error vector is utilized to calculate the reference stator voltage vector. Extracting the angle position and amplitude from the estimated stator flux vector and estimating the output torque are eliminated for the direct feedback control of the stator flux vector. The proposed scheme is comparatively investigated with a PI-SVM DTC scheme by experiment results. Experimental results show the feasibility and advantages of the proposed control scheme.

적응 자속 관측기를 이용한 유도전동기의 효율 최적화 제어 (Efficiency Optimization Control of Induction Motor using Adaptive Flux Observer)

  • 정동화;박기태;이홍균
    • 한국안전학회지
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    • 제16권4호
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    • pp.88-95
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    • 2001
  • Stator core loss has significant adverse effects when an induction motor is controlled by the conventional vector control method. Therefore, taking core toss into account should make it possible to control the torque very precisely. This paper proposes a speed sensorless vector control method for an induction motor at optimum efficiency and high response taking core loss account. The proposed vector control system consists of a speed adaptive rotor flux observer which takes core loss into account and employs a direct vector control which compensates for the influence of core loss. Also, in this paper, a vector controlled induction motor with a deadbeat rotor flux controller is developed. The method ensures optimum efficiency in the steady state without degradation of the dynamic response. The validity of the proposed technique is confirmed by simulation results for induction motor drive system.

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Robust Adaptive Precision Position Control of PMSM

  • Ko Jong-Sun;Ko Sung-Hwan;Kim Yung-Chan
    • Journal of Power Electronics
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    • 제6권4호
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    • pp.347-355
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    • 2006
  • A new control method for precision robust position control of a permanent magnet synchronous motor (PMSM) is presented. In direct drive motor systems, a load torque disturbance directly affects the motor shaft. The application of the load torque observer is published in using a fixed gain to solve this problem. However, the motor flux linkage cannot be determined precisely for a load torque observer. Therefore, an asymptotically stable adaptive observer base on a deadbeat observer is considered to overcome the problems of unknown parameters, torque disturbance and a small chattering effect. To find the critical parameters the system stability analysis is carried out using the Liapunov stability theorem.

직접벡터제어방식을 사용하는 전기추진시스템의 고조파 제어 (Harmonics Control of Electric Propulsion System using Direct Torque Control)

  • 김종수;오세진
    • 한국정보통신학회논문지
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    • 제13권12호
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    • pp.2618-2624
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    • 2009
  • 전기추진선박의 추진시스템에서 중요하게 고려해야 할 사항이 전력변환장치에 의해 전동기에 공급되는 전압 및 전류에 포함되는 고조파 성분을 억제하는 것이다. 근래에 특수선박의 전기추진시스템에서 속도 및 토크제어기법으로 많이 사용하고 있는 벡터제어방식이 많은 제어기와 복잡한 연산을 요구하고 토크의 동적 특성이 전동기의 정수변화에 영향이 큰 단점을 가지고 있어서 대안으로 제시되고 있는 제어기법 중에 하나가 직접토크제어방식이다. 하지만 직접토크제어방식은 영벡터를 인가하지 않으므로 토크리플이 심하여 공급 전류파형에 고조파 성분이 포함되는 단점을 가지고 있으므로 이를 해결해야 한다. 본 논문에서는 유도전동기를 추진기로 채용하고 있는 LNG 선박의 전기추진시스템에서 직접토크제어방식을 사용하는 경우에 고조파 발생을 저감하기 위한 제어방식을 제시한다. 새로운 직접토크제어방식은 샘플링 주파수의 변화없이 복잡한 제어기를 사용하지 않고 인버터 스위칭 주파수를 일정하게 유지한 채 개선된 공간벡터 변조법에 의해 인버터를 제어하는 방식이다. 제안된 방식의 유효성은 추진기에 공급되는 전류파형에 포함된 고조파 성분의 분석과 속도제어 특성을 통해 입증한다.