Costless-Function Model Predictive Current Control of Seven-Phase PMSM to Improve Dynamic Performance and Suppress Harmonics of Marine Electric Propulsion System

In order to improve the dynamic performance and suppress current harmonic for seven-phase PMSM (permanent magnet synchronous motor), this paper proposed an MPCC (mode predict current control) scheme based on SVPWM (space vector pulse width modulation) technique. By this scheme, the 14 virtual voltage vectors are first calculated based on the principle: the voltage vector synthesized in the 3rd harmonic subspace and the 5th harmonic subspace should be zero, in each sampling period, the optimal voltage vector is directly selected from the 14 virtual voltage vectors to achieve the best output current performance of seven-phase PMSM. In addition, no cost function related calculations are required in the MPCC scheme, reducing the calculation time and improving the dynamic response of the system. The simulation model of the seven-phase PMSM vector control system is established by using the Simulink tool of MATLAB, and the effectiveness of the scheme will be presented.