Three-Vector Model Predictive Current Control Strategy of PMSM for Marine Electric Propulsion Based on Three-Level Inverter

Aiming at the problem of large torque ripple of permanent magnet synchronous motor in Marine electric propulsion system, the three-vector model predictive current control (MPCC) strategy based on three-level inverter is proposed. The use of three-level inverters provides more voltage vectors that two-level inverters cannot provide, increasing the number and type of voltage vectors, and three voltage vectors are used in each control cycle, including two effective voltage vectors and a zero vector, so that the amplitude and direction of the output voltage vector are adjustable, and effectively reducing the motor torque ripple and current harmonics. The action time of the three voltage vectors is calculated by the principle of current deadbeat control. The proposed control method was verified by the StarSim simulation experimental platform of the ModelingTech Company. the experiment result shows that compared to the two-level dual-vector MPCC strategy, the torque ripple of the motor under the three-level three-vector MPCC strategy is reduced by 11.5% and 5.25% at half-load and rated-load respectively.