A control method and system for motor speed regulation

Abstract

The invention discloses a motor speed regulation control method and system. According to the method, based on power side stator flux orientation, a dual-closed-loop cascading structure of a rotary speed, a reactive power outer ring and a control side stator current inner loop is established by simplifying a mathematical model; influence from a current cross coupling item is counteracted through feedforward control; and decoupling control on the speed and reactive power of a brushless doubly-fed induction motor is realized; meanwhile, by adopting a phase-locked loop design thought, a power side stator flux observer is configured to obtain information of amplitude value, frequency, phase angle and the like of the stator flux so as to complete coordinate transformation of related electric quantity; by adoption of the method, dependency on parameter is low; the decoupling control on electromagnetic torque and reactive power can be realized; the static performance of a speed regulation system of the brushless doubly-fed induction motor can be ensured while high dynamic response performance also can be ensured under sudden change conditions of load and speed; and in addition, the technical scheme is simple to realize, low in calculated quantity and low in parameter dependency.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a control method and system for motor speed regulation. Background technique [0002] Motor, commonly known as "motor", refers to an electromagnetic device that realizes the conversion or transmission of electric energy according to the law of electromagnetic induction. According to the structure of the rotor, it can be divided into: cage induction motor and wound rotor induction motor. Brushless doubly-fed induction motor inherits the advantages of cage-type and wound-rotor induction motors, and can realize various operation modes such as self-starting, asynchronous, synchronous and doubly-fed, and has good starting characteristics and operating performance. Compared with ordinary doubly-fed induction motors, the motor has no brush and slip ring structure, which greatly reduces system cost and improves system stability. However, since the brushless double-fed induction motor has tw...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a control method and system for motor speed regulation, through the directional control method based on the stator flux linkage on the power side, to solve the influence of the rotor resistance in the traditional motor speed regulation control method, so that the control process has a large impact on the motor parameters The problem of strong dependence and the inability to achieve decoupling control of electromagnetic torque and reactive power

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