Asynchronous machine control method based on linkage compensation

Abstract

The present invention relates to an asynchronous machine control method based on linkage compensation. The method comprises: the step 1, calculating a motor torque and an air gap linkage amplitude value; the step 2, respectively obtaining a slip frequency given value and a voltage compensation value after amplitude limiting; the step 3, obtaining a basic output voltage given value of an inverter on a V / F curve according to the output frequency given value of the inverter; the step 4, calculating the output voltage given value of the inverter; and the step 5, controlling the switching state of an IGBT through a modulation unit through the inverter, and outputting the output voltage given value and the frequency given value to a motor. The asynchronous machine control method based on linkage compensation employs a flux linkage amplitude regulator to combine a V / F control curve to greatly improve a motor output torque response speed; the flux linkage amplitude regulator uses a flux linkage amplitude value and does not use a decoupled flux linkage amplitude value in a vector control mode so as to greatly reduce the dependence on the motor parameters and improve the control performance; and moreover, the asynchronous machine control method based on linkage compensation employs a torque regulator to combine the motor rotation speed to realize motor slip control and reduce the motor output torque fluctuation.

Description

technical field [0001] The invention relates to the field of motor control, in particular to an asynchronous motor control method based on flux linkage compensation. Background technique [0002] Energy saving, environmental protection and sustainable development have become two major themes in the world today. In order to cope with the increasingly severe energy consumption, all countries are adjusting their energy policies. According to statistics, 60% of the total load of my country's power grid is induction motors, and most of the motors run below the rated load, and a large amount of electric energy is wasted. In addition, high-power asynchronous motors have been widely used in various construction machinery. The combination of generators and electric motors is used to replace gasoline and diesel engines, complex gear boxes are removed, and the low-speed hard characteristics of the system are improved. is a big trend. To this end, countries are vigorously promoting a...

AI Technical Summary

Problems solved by technology

But its low-speed performance is poor, and the torque response is slow

The control performance of vector control is good, but it depends heavily on the motor parameters. In the application situation where the motor temperature changes greatly, the motor parameters will deviate greatly, which makes it difficult to calculate the phase angle and slip frequency of the rotor flux vector accurately. , resulting in a decrease in control performance

It can be seen that these two common control methods have advantages and disadvantages in engineering applications.

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