Digital control method and system for high-bandwidth current loop

Abstract

The invention relates to a digital control method and system for a high-bandwidth current loop, which can solve the technical problem that an existing current loop control technology is slow in dynamic response and poor in stability. The method comprises the steps of carrying out rapid sampling on three-phase current of a motor through an analog-digital converter, and compensating the collected current at the same time; converting the current under a static three-phase coordinate system into a static two-phase coordinate current signal through coordinate transform of the sampled three-phase current; converting the current signal under the two-phase static coordinate system into a current signal under a rotating orthogonal coordinate system (d, q); calculating and determining relevant parameters of the motor; designing a control algorithm based on the related parameters of the motor; converting the calculated voltage value from the orthogonal rotating coordinate system to the two-phasestatic coordinate system; carrying out sector calculation and per unit; and calculating the conduction time of a driving tube. According to the invention, the model of the motor is comprehensively considered, key parameters and feedforward compensation of the motor are introduced into the control law, and the response speed of the current loop is remarkably increased.

Description

technical field [0001] The invention relates to the field of electromechanical technology, in particular to a digital control method and system for a high-bandwidth current loop. Background technique [0002] The current loop control of the motor plays a very important role in the servo closed-loop control. The quality of the control law design determines the control effect of the motor. Compared with the speed loop and position loop, the control quality of the current loop can better reflect the control effect of the motor. Therefore, in the process of control law design, fully consider the characteristics of the motor, the loop control method and the control target, and find out the factors that affect the control design, such as the motor resistance, inductance, control frequency, back electromotive force constant, etc. . [0003] The defects of the existing current loop control technology are as follows: (1) The existing model-based algorithm is too complex, consumes re...

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Problems solved by technology

[0004] A high-bandwidth current loop digital control method and system proposed by the present invention can solve the technical problems of slow dynamic response and poor stability of the existing current loop control technology

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