Improved eulerian method-based rapid vector screening and torque predicting control method

Abstract

The invention discloses an improved eulerian method-based rapid vector screening and torque predicting control method. The method comprises the following steps: calculating the angle of a stator magnetic chain at the current moment, determining a sector of the stator magnetic chain through a sector judgment module, calculating the electromagnetic torque at the current component, and comparing reference torque and actual torque to generate a torque error; rapidly screening out three optimized voltage vectors, and accurately predicting a stator magnetic chain value and a torque value at the next moment by using a two-order eulerian formula; and finally obtaining the optimal on-off state of an inverter through an optimal value function, converting the on-off state into voltage by the inverter, outputting the voltage to a permanent magnet synchronous motor and driving the motor to operate. By the method, the calculation of a processor is shortened, the predicting value is more accurate, the problems that the permanent magnet synchronous motor model torque predicting control is large in on-line calculation quantity and long in executing time are solved, the predicting results of current, torque and magnetic chain are more accurate.

Description

technical field [0001] The invention relates to a fast vector screening predictive torque control based on the improved Euler method, which belongs to the motor drive and control technology. Background technique [0002] With the rapid development of power electronics technology, microcomputer technology and motor control technology, the permanent magnet synchronous motor has made great progress in control technology, and is currently developing towards the trend of high precision, low cost and miniaturization. The permanent magnet synchronous motor, as the core executive component, has been widely used in the fields of machine tools, household appliances, ships, elevators, robots and electric vehicles. Although the control technologies of permanent magnet synchronous motors such as vector control, direct torque control, sliding mode control and fuzzy control are gradually becoming mature, in actual engineering, these control technologies have certain shortcomings, such as l...

AI Technical Summary

Problems solved by technology

However, the disadvantage of this patent is that although the method of full-order sliding mode observation is adopted to avoid the dependence on the dq axis parameters, it is still necessary to predict eight basic voltage vectors, and it is still necessary to find the smallest value among the eight objective function values. The objective function value, the online calculation burden of the prediction algorithm has not been alleviated, and the execution time is still very long

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