Proportional integral (PI) parameter setting method for high-performance controller of permanent-magnet synchronous motor

Abstract

The invention discloses a proportional integral (PI) parameter setting method for a high-performance controller of a permanent-magnet synchronous motor, and belongs to the technical field of motor control. The method comprises the following steps of sampling the current of a motor winding; building a mathematical model of a motor driving system; drawing PI parameter stable domain; analyzing stability according to phase margin and magnitude margin of a frequency domain performance index, and drawing an expect margin domain; analyzing dynamic property according to overshoot and adjustment time of a time domain performance index, and drawing a three-dimensional diagram of a PI parameter and the performance indexes; and completing multi-objective optimization on the PI parameter, wherein a setting result is taken as a coefficient of a PI regulator in the controller. The method provided by the invention has the advantages that 1, a plurality of indexes of time domain and frequency domain are compatible, and a system is enabled to have relatively high robustness and favorable dynamic property; 2, the change relation between the performance indexes and the parameter of the system is directly disclosed by visual analysis, and the debugging direction of the PI parameter is indicated; and 3, modularization and programming are achieved, and the portability is high.

Description

technical field [0001] The invention relates to a method for setting PI parameters of a current loop of a motor control system, in particular to a visual analysis method for multiple performance indexes in time domain and frequency domain, and belongs to the technical field of motor control. Background technique [0002] Permanent magnet synchronous motor (PMSM) has the advantages of high power density, high efficiency and low noise, and has been used more and more in the field of electric vehicles. The motor controller (also known as the motor drive system) is the "brain" of the electric vehicle. The basic requirements for the motor controller are: 1) safe and reliable, and the system can still run stably when the system parameters change; 2) fast torque response, Satisfy the requirements of quick start and overtaking of the vehicle; 3) The field-weakening voltage can be adjusted quickly to adapt to the high-speed operation of the vehicle. The current loop is the inner loo...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a visual analysis method that can take into account multiple performance indicators in the time domain and frequency domain for the problems existing in the prior art that require repeated trial and error and poor tuning effects, and obtain the desired indicators All solutions, and indicate the direction of performance improvement, consider the influence of delay in the digital process, improve the tuning accuracy of PI parameters

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