A high-reliability current predictive control method and system for a permanent magnet synchronous motor

Abstract

The patent of the present invention discloses a high-reliability current predictive control method and system for permanent magnet synchronous motors. Aiming at the above defects of deadbeat current predictive control, a linear expansion state observation is established according to the discrete mathematical model of permanent magnet synchronous motors. The controller is used to predict the current of the next cycle, and the voltage disturbance caused by parameter changes is observed, and the voltage disturbance is compensated to the deadbeat current predictive controller, which solves the problem of the permanent magnet synchronous motor using deadbeat current predictive control. Dependence, low robustness, low steady-state precision, and poor operational reliability, the method of the invention has fast dynamic response of the motor, high steady-state control precision, high robustness, and reliable operation.

Description

[0001] Field [0002] The invention relates to the technical field of permanent magnet synchronous motors, in particular to a highly reliable current prediction control method and system for permanent magnet synchronous motors. Background technique [0003] Due to its high efficiency, small size, and simple structure, permanent magnet synchronous motors have been widely used in aerospace, home appliances, electric vehicles and other fields in recent years. Among the existing permanent magnet synchronous motor control technologies, vector control is the most widely used. It includes a double closed-loop control structure of the outer speed loop and the inner current loop. The design of the current loop determines the dynamic response speed and steady-state accuracy of the motor control system. , the controller mostly adopts PI controller. However, as a multivariable, strongly coupled nonlinear system, the performance of traditional PI control is susceptible to system uncertain...

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Problems solved by technology

[0005] The present invention is aimed at the problems in the prior art, and provides a high-reliability current predictive control method and system for a permanent magnet synchronous motor. Mathematical model, established a linear expansion state observer to predict the current of the next cycle, and observed the voltage disturbance caused by parameter changes, and compensated the voltage disturbance to the dead-beat current prediction controller, solved the problem of permanent magnet synchronous motor The deadbeat current prediction control depends on the motor parameters, low robustness, low steady-state precision, and poor operational reliability. The method of the invention has fast dynamic response of the motor, high steady-state control accuracy, high robustness, and reliable operation.

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