A model predictive torque control method for five-phase permanent magnet synchronous motor

Abstract

The invention discloses a model predictive torque control method of a five-phase permanent magnet synchronous motor, which belongs to the design and manufacture of multi-phase motor AC control systems in the field of power electronics and electric transmission. The main steps are: first, calculate where the deadbeat voltage vector lies sector, only select 4 voltage vectors (2 medium vectors + 2 large vectors) in this sector as the input set of model predictive torque control, so as to achieve real-time update; then use the predictive model to The four voltage vectors are predicted and calculated, and the optimal voltage vector is selected as the input of the system at the next moment in combination with the objective function. The method of the invention adopts model predictive torque control, has excellent dynamic response performance, and has less calculation amount, easier digital realization, and eases the pressure of digital chips.

Description

technical field [0001] The invention relates to the design and manufacture of a multi-phase motor AC control system (including a five-phase inverter and a five-phase permanent magnet synchronous motor) in the field of power electronics and electric transmission, in particular to a model predictive torque control of a five-phase permanent magnet synchronous motor method. Background technique [0002] Advances in microelectronics and power electronics have laid the foundation for the development of multiphase AC speed control systems. The advantages of the multi-phase system mainly lie in: the vibration and noise of the motor are small, the inverter has a large capacity, good output characteristics, high reliability, and high power density. [0003] Finite-Control-Set Model Predictive Torque Control (FCS-MPTC) is an online optimization control algorithm. In a five-phase converter-motor drive system, usually only 11 vectors (large vector + zero vector, MPTC-11) or 21 vectors ...

AI Technical Summary

Problems solved by technology

Selecting 11 vectors as the input set reduces the amount of calculation to a certain extent, but large harmonics will appear in the motor stator current, resulting in large torque ripple and poor control effect when the motor is in steady state; while selecting 21 Although a vector as an input set enriches the number of control sets and improves the control performance of the system, it brings a large computational burden to the digital control system and will cause other problems such as digital delay.

Images