Position-sensor-free speed regulating control method for brushless doubly-fed motor

Abstract

The invention discloses a position-sensor-free speed regulating control method for a brushless doubly-fed motor. The method includes the steps of acquiring a frequency fp of a power winding; acquiring a frequency fc of a control winding; acquiring a rotating speed identification value according to the frequency fp of the power winding and the frequency fc of the control winding; subtracting the rotating speed identification value from a rotating speed instruction value to acquire rotating speed deviation, and acquiring a control winding current amplitude instruction value after the rotating speed deviation is subjected to PI (proportional-integral) regulation; acquiring a power factor angle of the power winding, subtracting the power factor angle from a power factor angle instruction value to acquire power factor angle deviation, and acquiring a control winding current frequency instruction value after the power factor angle deviation is subjected to PI regulation; performing current closed-loop control on the control winding according to the control winding current amplitude instruction value, the control winding current frequency instruction value and an actual sampling value of control winding current, so that an actual response value of the control winding current tracks the instruction value of the current. The position-sensor-free speed regulating control method for the brushless doubly-fed motor does not depend on a position sensor, so that a series of problems caused by position sensor mounting are avoided; cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of AC motors and their control, and more specifically relates to a speed regulation control method for a brushless double-fed motor without a position sensor. Background technique [0002] Brushless doubly-fed motors originated at the end of the 19th century and were developed from series pole induction motors. Since the brushless double-fed motor has the advantages of simple structure, reliable operation, and small capacity of the frequency converter, it has gradually become a research hotspot since the 1980s. There are two sets of windings with different pole pairs on the stator of the brushless doubly-fed motor, which are called power windings and control windings respectively. Among them, the frequency of the power winding is generally constant frequency, and the voltage is generally constant voltage. The voltage and frequency of the control winding need to vary according to the speed and power. [00...

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Problems solved by technology

[0006] Aiming at the defects of the prior art, the purpose of the present invention is to provide a speed control method for a brushless doubly-fed motor without a position sensor, aiming to solve the problem that the prior art uses a mathematical model of a complex motor to identify the rotational speed, resulting in inaccurate identification question

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