Two-vector predictive control system and method for permanent magnet synchronous motor based on geometric method

A permanent magnet synchronous motor, predictive control technology, applied in the field of control, can solve problems such as large calculation burden, large current harmonics and torque ripple

Active Publication Date: 2018-12-18
SOUTHEAST UNIV
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Problems solved by technology

[0003] However, the traditional model predictive control method needs to traverse all the on-states of the inverter power tubes, which has a large computational burden, and only one basic voltage vector is selected as the optimal output in each control cycle, and there are large current harmonics and torque pulsation

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  • Two-vector predictive control system and method for permanent magnet synchronous motor based on geometric method
  • Two-vector predictive control system and method for permanent magnet synchronous motor based on geometric method
  • Two-vector predictive control system and method for permanent magnet synchronous motor based on geometric method

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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] like 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 speed P...

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Abstract

The invention discloses a two-vector predictive control system and method for a permanent magnet synchronous motor based on a geometric method. The method of the invention comprises the following steps: 1, obtaining a reference voltage vector according to a deadbeat control idea; 2, quickly screening three voltage vectors, including two non-zero vectors and one zero vector, through the position angle of the reference voltage vector as an alternative vector; 3, selecting two voltage vectors from three candidate vector by using a geometric method, and calculating a corresponding duty cycle; and4, converting the selected two voltage vectors and duty cycle into corresponding switching sequence, and output the optimal voltage to the permanent magnet synchronous motor through the inverter. Theinvention 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 extend to the control of the multi-phase motor.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/14H02P21/22
CPCH02P21/0017H02P21/14H02P21/22
Inventor 花为陈富扬黄文涛殷芳博
Owner SOUTHEAST UNIV
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