DECOUPLING CONTROL SYSTEM AND METHOD FOR HARMONIC CURRENT OF SALIENT POLE SYNCHRONOUS MOTOR

摘要

The present invention relates to a decoupling control system and method for a harmonic current of a salient pole synchronous motor. The system includes a harmonic current detection module, configured to acquire 6k±1 harmonic current feedback, wherein k is a positive integer; a linear transformation module, configured to perform linear transformation on 6k±1 harmonic current references and 6k±1 harmonic current feedback in a harmonic reference frame separately to acquire new harmonic currents; a harmonic current decoupling control module, configured to make adjustment according to an error between a harmonic current reference subjected to the linear transformation and harmonic current feedback subjected to the linear transformation, and perform independent decoupling control over each of the harmonic currents; an inversely linear transformation module, configured to perform inversely linear transformation on an output voltage to acquire a control output voltage in the harmonic reference frame; and a motor control module, configured to take the control output voltage as a part of output voltage reference of the inverter for controlling operation of the motor. Compared with the prior art, the present invention achieves dynamic decoupling control over the harmonic current, improves control accuracy and response speed of the harmonic current, and also simplifies the design of decoupling harmonic current controller by utilizing the linear transformation.