Model predictive current control method for open-winding permanent magnet synchronous motor

A technology of permanent magnet synchronization and model prediction, which is applied in motor generator control, electronic commutation motor control, current controller, etc. The effect of simple structure and excellent drive output performance

Inactive Publication Date: 2019-10-08
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the direct connection of the DC bus capacitors of the converters on both sides, there is a zero-sequence current in the system
The zero-sequence current makes the performance of the motor unstable. Therefore, a model predictive current control method for an open-winding permanent magnet synchronous motor is proposed to suppress the zero-sequence current and improve the steady-state performance of the motor.

Method used

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  • Model predictive current control method for open-winding permanent magnet synchronous motor
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  • Model predictive current control method for open-winding permanent magnet synchronous motor

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specific Embodiment approach 1

[0049] DETAILED DESCRIPTION - A model predictive current control method for an open-winding permanent magnet synchronous motor, comprising the following steps:

[0050] Step a. establishes the mathematical model of open-winding permanent magnet synchronous motor;

[0051] Step b. Computing and synthesizing the basic space voltage vector;

[0052] Step c. performing current prediction on the open-winding permanent magnet synchronous motor;

[0053] Step d. Bring the current prediction value at k+2 moment into the vector screening module;

[0054] Step e. Applying the switching state of the synthesized basic space voltage vector with the minimum vector screening value to the converter to drive the motor system.

specific Embodiment approach 2

[0055] Embodiment 2 A model predictive current control method for an open-winding permanent magnet synchronous motor, such as figure 1 , figure 2As shown, it includes: a controllable converter module 2, an uncontrollable converter module 3, a current detection module 8, an AC voltage detection module 6, a speed sensor module 7 connected to an open-winding permanent magnet synchronous motor module 4, and a controllable converter module 2 generates a controllable voltage vector set, the uncontrollable converter module 3 generates an uncontrollable voltage vector set, the controllable voltage vector set and the uncontrollable voltage vector set are converted into a basic space voltage vector module 9 to drive the open-winding permanent magnet synchronous motor module 4, The controllable converter module 2 and the uncontrollable converter module 3 are connected to the open-winding permanent magnet synchronous motor module 4, and since the converters on both sides have a common DC...

specific Embodiment approach 3

[0060] Specific Embodiment Three As the open-winding permanent magnet synchronous motor of the present invention:

[0061] The voltage equation of an open-winding permanent magnet synchronous motor:

[0062]

[0063] where u a , u b , u c Indicates the terminal voltage of phase a, phase b and phase c of the motor, e a 、e b 、e c Indicates the electromotive force of phase a, phase b and phase c. u a1 , u b1 , u c1 Indicates the a-phase, b-phase and c-phase voltages output by the controllable converter, u a2 , u b2 , u c2 Indicates the voltage of phase a, phase b and phase c output by the uncontrollable converter, i a i b i c Indicates the components of phase a, phase b and phase c of the stator current, R s Represents stator resistance, M represents mutual inductance, and L represents self-inductance. Transform the voltage equation in the three-phase stationary coordinate system in formula (1) into the synchronous rotating coordinate system with the transforma...

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Abstract

The invention discloses the research of a model predictive current control method for an open-winding permanent magnet synchronous motor, which belongs to the technical field of permanent magnet synchronous motor model predictive current control. The method is characterized in that the research adopts the open-winding permanent magnet synchronous motor which maintains the stator and rotor structure characteristics of a permanent magnet synchronous motor; and the neutral point of a winding is opened to form the open-winding permanent magnet synchronous motor to increase the output voltage of aconverter. The core idea of the model predictive current control method is to predict the current state quantity of a system at the next moment, and has the advantages of rapid dynamic response and the like. The model predictive current control method is applied to the current loop control system of the open-winding permanent magnet synchronous motor. According to the principle that the dq0 axis current error value is the smallest in vector screening, the zero-sequence current of the open-winding permanent magnet synchronous motor is effectively suppressed.

Description

technical field [0001] The invention belongs to the technical field of model predictive current control of permanent magnet synchronous motors, and in particular relates to a model predictive current control method of an open-winding permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors have problems such as high switching frequency, low system efficiency, and large electromagnetic noise. The open-winding permanent magnet synchronous motor has the advantages of high efficiency, high density, and high power. So it is of great significance to study the open-winding permanent magnet synchronous motor. However, since the DC bus capacitors of the converters on both sides are directly connected, there is a zero-sequence current in the system. The zero-sequence current makes the performance of the motor unstable. Therefore, a model predictive current control method for an open-winding permanent magnet synchronous motor is proposed t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/28H02P6/34H02P21/22
CPCH02P6/28H02P6/34H02P21/22
Inventor 李文娟乜春颖张琦
Owner HARBIN UNIV OF SCI & TECH
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