Analysis of different system design solutions for a high-power ship propulsion synchronous motor drive with multiple PWM converters

In this paper two possible design alternatives are investigated for a high-power synchronous motor propulsion drive employing two voltage-source inverters for motor supply. The two arrangements are compared based on their steady-state behavior in both normal and faulty conditions (i.e. with one out-of-service inverter), predicted by time-stepping finite-element simulations. Simulation results found consistent with the results expected theoretically and based on previous studies. Pros and contras of the two design alternatives are highlighted together with the possible design strategies that could help mitigate their drawbacks.