Abstract: A voltage control method. A train traveling speed can be acquired; a target transformation ratio corresponding to the train traveling speed is determined according to correspondences between train traveling speeds and transformation ratios, the transformation ratio being a ratio of an input voltage to an output voltage; an input voltage is then transformed according to the target transformation ratio to obtain an output voltage, the output voltage being used for driving a train to travel. The correspondences between train traveling speeds and transformation ratios are obtained according to correspondences between train traveling speeds and train traction forces at different transformation ratios. By means of the method, the most suitable transformation ratio can be provided according to a traveling speed of a maglev train, thereby increasing the traction force of the maglev train and improving running efficiency.

Abstract: A decoupling control system for a salient pole synchronous motor that includes a harmonic current detection module, configured to acquire 6k±1 harmonic current feedback; 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; and 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.

Abstract: The present invention relates to a decoupling control system and method for a harmonic current of a salient pole synchronous motor.