Research on marine propulsion motor control based on virtual voltage vector model to predict torque
Aiming at the problem that the traditional direct torque control technology(DTC)of the six-phase perman-ent magnet synchronous motor in Marine electric propulsion system only employs the outermost voltage large vector,which will produce large harmonic current and lead to large torque fluctuation,a model predictive torque control strategy(V-MPTC)based on virtual voltage vector synthesis is proposed.By using the principle that the large vector and medium vector in the same direction in the α-β subspace correspond to the small vector and medium vector in the z1-z2 subspace in the op-posite direction,the amplitude of the synthesized voltage vector in the zl-z2 subspace can be 0 by adjusting the duty ratio of the large vector and medium vector in a PWM period,and the suppression of the harmonic current as well as torque ripple of the motor can be realized.At the same time,in order to facilitate the realization of the hardware system,the voltage vector centralization and the prediction method of two steps in advance are adopted.The simulation results show that the V-MPTC control strategy can improve the system response speed,suppress the start-up speed overdrive,reduce the torque ripple from 0.15 N·m to 0.04 N·m,and decrease the harmonic distortion rate from 68.92％to 10.85％,which proves that the control per-formance of Marine electric propulsion system can be improved by this method.
marine electric propulsionmodel predictive torque controlharmonic current suppressionvector of voltage
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