A Model Predictive Direct Torque Control Method for Induction Motors

Abstract

The invention discloses an asynchronous motor model prediction direct torque control method, and relates to the technical field of motor control. Two control methods are improved through the mode of partition prediction and table lookup on the basis of comparative research of the performance of two control methods. According to the method, the system performance can be further improved, and the transient and steady-state torque ripple, stator flux linkage and current fluctuation of the motor can be significantly reduced. The simulation result proves that the torque, the flux linkage and the current fluctuation of the conventional DTC can be effectively reduced by the novel DTC strategy, the advantages of rapid response and simple control of the conventional DTC can be maintained and the control performance of the conventional DTC can be improved; meanwhile, vector selection is performed through combination of the partition table so that the dependence of finite model prediction controlon the model parameter accuracy can be reduced, and online computation of finite model prediction control can also be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to an asynchronous motor model prediction direct torque control method. Background technique [0002] Depenbrock and Takahashi each proposed the theory of direct torque control in the mid-1980s. So far, vector control (Field Oriented Control, FOC) and direct torque control have become the two most commonly used methods in the field of high-performance AC speed regulation. Compared with vector control, the traditional vector table-based direct torque control (Switching-based Direct Torque Controlled, ST-DTC) is calculated in the stationary stator coordinate system, without rotating coordinate transformation, current regulator and pulse width modulation module ; It uses two predictive comparators and a vector table to select the voltage vector that makes the stator flux and torque change to their respective given values ​​according to the instantaneous error of flux and torque,...

AI Technical Summary

Problems solved by technology

Compared with ST-DTC, MP-DTC has better steady-state performance, but the amount of calculation is large, and the accuracy of the model and parameters is higher.

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