Brushless doubly-fed motor feedforward current control system, feedforward current controller and design method thereof

Abstract

The present invention discloses a brushless doubly-fed motor feedforward current control system, a feedforward current controller and a design method thereof. The control system comprises a power grid, a brushless doubly-fed motor, a first converter, a second converter, a flux linkage computing module, an angle computing module, an angular speed computing module, a photoelectric coded disk, a feedforward current controller, a third converter, a fourth converter, an SVPWM pulse generator, a control winding side power converter and a direct current side; the feedforward current controller in thecontrol system is simple in control structure, compact, high in control precision, and rapid in current dynamic response; the system adds feedforward compensation on the basis of fully considering the whole current loop features of the control winding so as to greatly improve the control effect of the control winding state current and can achieve better stability and the faster dynamic performance; and moreover, the control system is high in stability, can effectively enlarge the stable operation range of the brushless doubly-fed motor and keep a good performance in different operation speeds.

Description

technical field [0001] The invention relates to a brushless doubly-fed motor control system, in particular to a brushless doubly-fed motor feed-forward current control system, a feed-forward current controller and a design method thereof. Background technique [0002] With the development of motor manufacturing technology, an AC motor with better performance - brushless doubly-fed motor has played an increasingly important role in the fields of ship power generation, variable speed and constant frequency power generation systems, and speed control systems. Brushless double-fed motors can realize asynchronous operation, synchronous operation and double-fed operation. Brushless double-fed motor has stable performance and simple structure. At the same time, the inverter required for control has a small capacity and low cost. Compared with the widely used double-fed motor, it has no brushes and slip rings and has higher reliability. However, there are still problems such as hig...

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Problems solved by technology

Scalar control is to directly control the stator voltage and frequency of the power winding and control winding, and then change the running state of the motor. Since only the voltage and frequency need to be controlled, the control algorithm is relatively simple, but its anti-interference ability is poor; vector control mainly through The current loop controls the brushless double-fed motor, and the existing research has not considered the analysis of the stability and dynamics of the control system; the direct torque control needs to measure the terminal voltage, current and speed of the motor to estimate the flux linkage and rotation speed of the motor. Torque, and then realize the control of the motor, the existing control method lacks the research on the characteristics of the current loop of the control winding, and the stability and dynamics of the control system are not good.

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