Abstract: In order to decrease the carbon emissions and reduce the fuel cost of large-scale marine, the ideal way is to minimize the operational time of diesel generation system, and ship shaft synchronous generator converter is the best solution. The traditional ship shaft synchronous generator converter can’t make the full use of generator capacity, and has some deficiency of lower power factor, poor current THD, large fluctuations of DC link voltage, which leads to instability of invertor output voltage. This paper proposed a novel model combining the broad-frequency brushless excite synchronous generator（BFBESG） with the four-quadrant converter（FQC）.On the generator side, a variable frequency PWM rectifier scheme had been proposed, including an inner current loop based on complex vector PI controller and an outer voltage loop based on balance of the instantaneous power. The resonant phase locked loop was adopted to lock the phase of generator terminal voltage. The 100 k W experimental prototype of shaft synchronous generator converter had been developed. Through the prototype load experiment, the feasibility and superiority of the proposed control scheme are verified.