A current loop delay compensation method for three-phase permanent magnet synchronous motor drive system

Abstract

The invention discloses a current loop delay compensation method of a three-phase permanent magnet synchronous motor drive system, which predicts the next cycle based on the motor model d-q The shaft stator current is used as the feedback value of the PI regulator to calculate the reference value of the stator voltage. In view of the influence of motor parameter changes on the prediction accuracy, the present invention further corrects the above prediction model. When the actual parameters are inconsistent with the motor parameter nominal values, the error voltage item in the model will have the effect of correcting the current prediction value. The invention does not need to change the hardware configuration or add additional logic devices, has low cost, is simple to implement and is easy to expand, weakens the limitation of the digital delay on the adjustment speed of the current loop, and accelerates the current tracking characteristics, even in the case of large changes in motor parameters It still guarantees high control precision, and is suitable for permanent magnet synchronous motor drive occasions with high requirements for dynamic tracking and control precision.

Description

technical field [0001] The invention relates to the field of motor control technology, in particular to a method for compensating a current loop time delay of a three-phase permanent magnet synchronous motor drive system. Background technique [0002] Permanent magnet synchronous motor (PMSM) can achieve high precision, high dynamic performance and wide range of speed regulation, so it is used in many motor drive occasions. Rotor Field Oriented Control (FOC) is currently the most widely used motor control strategy in PMSM systems. Compared with other strategies, it has the advantage of high torque control accuracy. The rotor field oriented control adopts a cascade control structure, and the current loop is used as the inner loop of the system. Its excellent tracking characteristics and high enough bandwidth are the prerequisites to ensure the stability and fast response of the system. Without considering the d, q axis current coupling, the PMSM current loop bandwidth is rel...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a current loop delay compensation method of a three-phase permanent magnet synchronous motor drive system for the defects involved in the background technology, so as to solve the problem that the response speed of the current loop of the permanent magnet synchronous motor drive system is affected by the digital Large delay constraints, the current tracking characteristics of traditional compensation schemes are greatly affected by changes in motor parameters, traditional current loops need to change hardware configuration or increase hardware costs and other technical problems

Images