Five-phase permanent magnet synchronous motor model prediction torque control method

Abstract

The invention discloses a five-phase permanent magnet synchronous motor model prediction torque control method, and belongs to multi-phase motor alternating current control system design and manufacture in the field of power electronics and power drive. The main steps are as follows: first a sector where a dead-beat voltage vector is is calculated, and only four voltage vectors (two medium vectors plus two large vectors) in the sector are selected as an input set of model prediction torque control, thereby realizing real-time updating; and then a prediction model is utilized to perform prediction calculation on the four voltage vectors in the input set, and combined with an objective function, an optical voltage vector is selected as an input of a system at the next moment. The method provided by the invention adopts model prediction torque control, has excellent dynamic response performance, and is relatively small in calculation amount, digital realization is relatively easy, and the pressure of a digital chip is relieved.

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.

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