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Non-weighted model predictive torque control system and method for permanent-magnet synchronous motors

A permanent magnet synchronous motor, model prediction technology, applied in the direction of control system, torque ripple control, vector control system, etc. status and other issues

Active Publication Date: 2017-08-04
SOUTHEAST UNIV
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  • Description
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  • Application Information

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Problems solved by technology

However, this method fails to consider the salient pole effect of the permanent magnet synchronous motor, nor does it consider the operating condition of the motor in the constant power region

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  • Non-weighted model predictive torque control system and method for permanent-magnet synchronous motors

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0045] Such as figure 1 As shown, a weightless model predictive torque control system for permanent magnet synchronous motors, including a speed PI controller 1, a torque PI controller 2, a current reference calculation module 3, a stator flux reference calculation module 4, and an optimization module 5 , inverter 6, permanent magnet synchronous motor 7, torque estimation module 8, load angle calculation module 9, stator flux linkage prediction module 10, encoder 11 and current sensor 12.

[0046] A difference is made between the rotational speed reference value and the actual rotational speed obtained by the encoder 11, and the difference is input to the rotational speed PI controller 1; the torque reference value output by the rotational speed PI controller 1 is different from the torque estimated value obtained by the torque estimation modul...

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Abstract

The invention discloses a non-weighted model predictive torque control system and a method for permanent-magnet synchronous motors. The method comprises the following steps: getting the reference value of torque through a speed controller, calculating the reference value of stator flux amplitude according to the principle of maximum torque-to-current ratio and a flux equation, and getting the load angle increment through a torque controller; getting the load angle at the current time through a calculated stator flux angle and a detected rotor position angle, getting the reference value of load angle at a time (k+1) according to the load angle increment and the load angle at the current time, and getting the reference value of stator flux at the time (k+1) based on the reference value of load angle and the reference value of stator flux amplitude; building a value function with use of the reference value of stator flux amplitude and a predicted value of stator flux amplitude; and getting an optimal voltage vector by optimizing the value function, and transmitting the optimal voltage vector to a permanent-magnet synchronous motor. The salient pole effect of the permanent-magnet synchronous motor is taken into account. The method can be combined with other optimization control strategies, and can be applied both to a constant-torque zone and a constant-power zone.

Description

technical field [0001] The invention relates to a weightless model-predicted torque control system and method for a permanent magnet synchronous motor, belonging to the field of motor drive and control. Background technique [0002] Finite control set model predictive control can solve optimization problems online according to the constraints and discrete characteristics of the controlled object. Its structure is simple and easy to implement, and it has been widely used in the fields of power electronics and motor drives in recent years. Among them, model predictive torque control, as a control form in model predictive control of finite control set, has been deeply studied in the field of motor control. Model predictive torque control is developed from direct torque control, which takes torque and stator flux amplitude as control objectives, and selects the optimal switching state by optimizing the value function of the control objectives. Compared with direct torque contro...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P21/20H02P21/14H02P6/10
CPCH02P6/10H02P21/0017H02P21/14
Inventor 花为黄文涛殷芳博丁石川
Owner SOUTHEAST UNIV
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