Two-Vector Predictive Control Method for Permanent Magnet Synchronous Motor Based on Geometric Method

Abstract

The invention discloses a two-vector predictive control system and method of a permanent magnet synchronous motor based on a geometric method. The method of the present invention includes the following steps: Step 1: Obtain the reference voltage vector according to the idea of ​​deadbeat control; Step 2: quickly screen out three voltage vectors through the position angle of the reference voltage vector, including two non-zero vectors and a zero vector , as a candidate vector; Step 3: Select two voltage vectors from the three candidate vectors using the geometric method, and calculate the corresponding duty cycle; Step 4: Convert the selected two voltage vectors and the duty cycle into The corresponding switching sequence, and output the optimal voltage to the permanent magnet synchronous motor through the inverter. The invention can effectively improve the steady-state performance of the permanent magnet synchronous motor, and is easier to understand than the traditional two-vector model predictive control system based on the analytical method, and is easy to expand to multi-phase motor control.

Description

Technical field:

[0001] The invention relates to a two-vector predictive control system and method of a permanent magnet synchronous motor based on a geometric method, belonging to the technical field of control. Background technique:

[0002] Compared with electric excitation motors, permanent magnet motors have the remarkable characteristics of simple structure, small size, light weight, low loss and high efficiency, and are widely used in industrial and agricultural production, aerospace, national defense equipment and household appliances. The control performance requirements of the permanent magnet motor are also getting higher and higher, so the control technology of the permanent magnet motor is also developing rapidly. In recent years, model predictive control has been widely concerned as a motor optimization control method in the current frequency conversion speed regulation system due to its simple principle and easy handling of system nonlinear constraints. [00...

Examples

Embodiment Construction

[0042] The present invention will be further illustrated below in conjunction with specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0043] Such as figure 1 As shown, a two-vector model predictive control system for permanent magnet synchronous motors based on the geometric method, including a speed PI controller 1, a current acquisition module 2, a rotor position feedback module 3, a coordinate transformation module 4, and a deadbeat voltage calculation module 5 , dual voltage vector selection and duty cycle calculation module 6, voltage vector action sequence module 7, inverter 8 and five-phase permanent magnet synchronous motor 9;

[0044] The speed reference value is compared with the actual speed obtained by the rotor position feedback module 3, and the speed difference is input to the speed PI controller 1; the spee...

Technical field:

[0001] The invention relates to a two-vector predictive control system and method of a permanent magnet synchronous motor based on a geometric method, belonging to the technical field of control. Background technique:

[0002] Compared with electric excitation motors, permanent magnet motors have the remarkable characteristics of simple structure, small size, light weight, low loss and high efficiency, and are widely used in industrial and agricultural production, aerospace, national defense equipment and household appliances. The control performance requirements of the permanent magnet motor are also getting higher and higher, so the control technology of the permanent magnet motor is also developing rapidly. In recent years, model predictive control has been widely concerned as a motor optimization control method in the current frequency conversion speed regulation system due to its simple principle and easy handling of system nonlinear constraints. [00...

Examples

Embodiment Construction

[0042] The present invention will be further illustrated below in conjunction with specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0043] Such as figure 1 As shown, a two-vector model predictive control system for permanent magnet synchronous motors based on the geometric method, including a speed PI controller 1, a current acquisition module 2, a rotor position feedback module 3, a coordinate transformation module 4, and a deadbeat voltage calculation module 5 , dual voltage vector selection and duty cycle calculation module 6, voltage vector action sequence module 7, inverter 8 and five-phase permanent magnet synchronous motor 9;

[0044] The speed reference value is compared with the actual speed obtained by the rotor position feedback module 3, and the speed difference is input to the speed PI controller 1; the spee...

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