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Method for determining alternative voltage vector set by equally dividing flux linkage circle

A technology of voltage vector and flux linkage, applied in the field of vector selection, can solve the problems of increasing the calculation running time and complexity, and achieve the effect of simplifying the selection of the system and reducing the calculation time.

Active Publication Date: 2019-10-22
CHANGAN UNIV
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Problems solved by technology

However, with the variables and operation functions, the time and complexity of the calculation operation are increased. Therefore, a method of equally dividing the flux linkage circle to determine the set of alternative voltage vectors is proposed to optimize the performance of the control system.

Method used

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  • Method for determining alternative voltage vector set by equally dividing flux linkage circle
  • Method for determining alternative voltage vector set by equally dividing flux linkage circle
  • Method for determining alternative voltage vector set by equally dividing flux linkage circle

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Embodiment Construction

[0056] see figure 1 and figure 2 , the present invention provides a method for equally dividing the flux linkage circle to determine the set of alternative voltage vectors, comprising the following steps:

[0057] S1. Based on DTC predictive control, divide the inscribed circle of the stationary coordinate system into three equal parts to obtain an angle set {0°, 120°, 240°};

[0058] S2. Calculate the cost function g value through the stator flux linkage amplitude and the motor torque value by dividing the angle set of 3 equal parts of the stationary coordinate system and the angle set of 3 equal parts of the stationary coordinate system plus 0 voltage vector;

[0059] The cost function formula is shown in formula (5):

[0060]

[0061] S3. Divide the inscribed circle into three equal parts corresponding to the voltage vector set {V 1 V 3 V 5 V 0} or {V 2 V 4 V 6} for performance comparison, and then compare the two voltage vector sets with the basic voltage vect...

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Abstract

The invention discloses a method for determining an alternative voltage vector set by equally dividing a flux linkage circle. The method comprises the following steps of: firstly, equally dividing aninscribed circle under a static coordinate system into three equal parts based on DTC prediction control; performing performance comparison on a voltage vector set {V1 V3 V5 V0} or {V2 V4 V6} corresponding to three equal division of the inscribed circle; performing performance comparison on the two voltage vector sets, a basic voltage vector and a traditional switch table; and selecting a voltagevector set with optimal performance by integrating factors such as a cost function and a switching frequency. According to the invention, the selection of the system can be simplified, the operation time is reduced, and the method has certain feasibility.

Description

technical field [0001] The invention belongs to the technical field of vector selection, and in particular relates to a method for equally dividing a flux linkage circle to determine a set of candidate voltage vectors. Background technique [0002] Model predictive control is a model-based advanced control technology with high control performance. In the field of motor control, model predictive control is regarded as the third high-performance motor control strategy after field-oriented control and direct torque control, so model predictive control has gained more and more attention in the field of motor control. [0003] In the surface type permanent magnet synchronous motor DTC predictive control system, the comprehensive consideration of torque RMSE, stator flux linkage RMSE, evaluation function, cost function and average switching frequency is introduced to select the optimal voltage vector set to achieve more ideal control Effect. However, with the variables and opera...

Claims

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Application Information

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IPC IPC(8): H02P21/30H02P21/05
CPCH02P21/05H02P21/30
Inventor 李耀华任佳越杨启东师浩浩
Owner CHANGAN UNIV
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