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Method and system for vector control of permanent magnet synchronous motor

A permanent magnet synchronous motor, vector control technology, applied in vector control systems, control systems, motor generator control and other directions, can solve problems such as poor control performance, and achieve good dynamic performance and static accuracy.

Inactive Publication Date: 2015-04-29
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology

[0006] Aiming at the problem of poor control performance when the parameters of permanent magnet synchronous motors change greatly, the present invention provides a vector control method and system for permanent magnet synchronous motors with better dynamic performance and static precision

Method used

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  • Method and system for vector control of permanent magnet synchronous motor
  • Method and system for vector control of permanent magnet synchronous motor
  • Method and system for vector control of permanent magnet synchronous motor

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Embodiment approach

[0125] As an implementable manner, the modeling module includes a sampling module, an input module and an output module;

[0126] in:

[0127] The sampling module is used to obtain the stator current i A and i B , the mechanical angle of the motor rotor and the rotational speed ω e , the mechanical angle of the motor rotor is converted into an electrical angle θ e ;

[0128] The input module for stator current i A and i B The dq-axis current component i is obtained by Clarke transformation and Park transformation d and i q , input to the current prediction control module, the electrical angle θ e Input to the calculation of the Park transform and its inverse transform, the rotational speed ω e As the negative feedback of the speed outer loop or torque outer loop, as well as the input current predictive controller and online parameter identification module;

[0129] The output module is used to output the reference quantity i of the q-axis current q ’ and the referen...

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Abstract

The invention provides a method and system for the vector control of a permanent magnet synchronous motor. The method comprises the following steps: establishing a current prediction model of the permanent magnet synchronous motor; calculating by an online parameter identification method to obtain motor parameters; inputting the motor parameters into a current prediction controller, updating the current prediction model in real time, outputting quadrature and direct axis voltage to a PARK inverse transformation module, and controlling the motor through an SVPWM module. Motor current can be more accurately controlled to follow given variation, and the system for the vector control of the permanent magnet synchronous motor has better dynamic performance and static precision.

Description

technical field [0001] The invention relates to the technical field of permanent magnet synchronous motor control, in particular to a permanent magnet synchronous motor vector control method and system. Background technique [0002] At present, the position, speed and current loops in the vector control system all use conventional PI (Proportion Integration) or PID (Proportion Integration Differentiation) regulators. These regulators are generally designed based on linear theory and can only operate at a specific operating point or Better control within a limited range. In order to obtain good dynamic performance and eliminate static error, the calculation of gain of PI regulator requires an accurate mathematical model of the system. It turns out that such regulators are very sensitive to disturbances and changes in system parameters. [0003] Nonlinear PI and variable parameter PI control methods realize current control and obtain a controller with robust performance, but...

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Application Information

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IPC IPC(8): H02P21/14H02P27/08
Inventor 张有林郭清风米雪涛钱强宋泽琳许敏程海松许纹倚
Owner GREE ELECTRIC APPLIANCES INC
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