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A model predictive control method for induction motor based on extended control set

A model predictive control, asynchronous motor technology, applied in the control of generators, control of electromechanical brakes, control of electromechanical transmissions, etc., can solve the problem that the optimization of asynchronous motors cannot be well realized

Active Publication Date: 2019-01-25
HEFEI UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is that none of the existing technologies can better realize the torque ripple suppression and the optimization of the calculation process of the finite control set model predictive control of the asynchronous motor

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  • A model predictive control method for induction motor based on extended control set
  • A model predictive control method for induction motor based on extended control set
  • A model predictive control method for induction motor based on extended control set

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Embodiment Construction

[0080] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0081] Such as figure 2 As shown, a model predictive control method of asynchronous motor based on extended control set, including:

[0082] Step 1: signal collection; the collected signal includes DC side voltage U dc , stator voltage vector u s , stator current vector i s , Rotor electrical angular velocity ω r .

[0083] Furthermore, in step 1, the DC side voltage U dc , stator voltage vector u s The way to get it is:

[0084] Stator voltage vector u s The voltage vector signal sent by the operation unit of the motor controller is directly collected, and then replaced by the value obtained by the digit...

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Abstract

The invention discloses an asynchronous motor model predictive control method based on an extended control set, which relates to the technical field of asynchronous motor. The discretization mathematical model and full-order observer mathematical model of asynchronous motor are established, and the collected signals are substituted into the model. The model is compensated for the time delay. The objective function of electromagnetic torque and flux linkage of induction motor is constructed. Expanding the voltage vector; Selection of optimal voltage vector; According to the switching state andduty cycle of the switching transistor corresponding to the selected optimal voltage vector, the on-time of the switching transistor is obtained, the value of the comparison register is updated, and the switching signal of the inverter is generated by the digital signal processor to complete the generation of the voltage vector modulation signal of the inverter. The advantages are that the controlset is extended, the problem of large torque ripple is solved, and the stability of steady-state operation of the system is improved.

Description

technical field [0001] The invention relates to the technical field of asynchronous motors, in particular to a model predictive control method for asynchronous motors based on extended control sets. Background technique [0002] With the continuous improvement of DSP operation speed, Finite Control Set-MPC (FCS-MPC) does not need a modulator, and it does not need to comprehensively consider the prediction time domain, control time domain, and the weight of each time domain objective function. The key to its realization is the combination of the discrete characteristics of the transformer and the limited characteristics of the switch state, and it has become an important branch in the field of AC motor control. [0003] Such as figure 1 As shown, the hexagonal structure adopted, for the traditional model predictive control scheme, because the switching states of the upper and lower arms of the three-phase two-level inverter are complementary, a total of 8 basic switching sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00
CPCH02P21/0003
Inventor 杨淑英刘云飞谢震张兴
Owner HEFEI UNIV OF TECH
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