Brushless double feed motor control device and direct torque control method thereof

Abstract

A brushless double feed motor control device and a direct torque control method thereof. The device comprises a brushless double feed motor, a flux linkage, a torque observer, etc., wherein the torque observation is calculated under the stationary reference frames of a power winding and a control winding. The method comprises the following steps: the voltage and the current of the control winding, as well as the power winding are observed under a three-phase coordinate system and coordinate transformation is performed, so as to get the voltage and the current of the control winding, as well as the power winding under respective stationary reference frame; the flux linkages and the torques of the control winding and the power winding are calculated; and the voltage vector is selected through the sector the flux linkage is positioned which is determined by the flux linkage of the control winding, and the torque and flux linkage increments obtained by the demand and feedback of the torque, and those of the flux linkage of the control winding. By adopting the invention, the torque observation of the brushless double feed motor can be realized under the stationary reference frames of the power winding and the control winding, so as to avoid unstable observation results caused by rotational coordinate transformation and measuring error due to rotor angular velocity. The control system has simple structure and higher control accuracy.

Description

technical field [0001] The invention relates to a brushless doubly-fed motor control device and its direct torque control method, in particular to a brushless doubly-fed motor control device and its direct torque control method which can be realized in the respective static coordinate systems of the power winding and the control winding. torque control method. Background technique [0002] Brushless double-fed motor is a new type of AC motor developed in recent years. Its structure is similar to that of cage-type rotor asynchronous motor. There is no slip ring carbon brush, and double-fed operation can be realized—it can be used as a motor to operate in AC speed regulation The system can also be used as a generator to run in variable-speed constant-frequency wind power generation systems. It has the characteristics of small inverter capacity and adjustable power factor. [0003] Direct torque control is a control method that emerged after vector control. This control method...

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Problems solved by technology

[0029] In order to overcome the shortcomings of the existing brushless doubly-fed motor direct torque control system, the electromagnetic torque observation needs to carry out the shortcomings of rotating coordinate transformation, the present invention provides a cage-type rotor brushless doubly-fed motor control device in the static coordinate system and its direct torque Control Method

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