Aimed at offshore wind energy development and utilization, a modular stator permanent magnet generator (MSPMG) based on input-parallel output-series single active bridge converter (IPOS-SABC) topology is proposed and designed in this paper. The proposed generator consists of multiple stator permanent magnet generating modules (SPMGM) with uniformly spatial phase shifting and each SPMGM is single-phase doubly salient structure embedded with permanent magnet (PM) and teethed windings which significantly reduce the magnetic coupling between modules. By analyzing the electromagnetic torque and power characteristics of the generator, the optimal power control (OPC) strategy based on variational principle is deduced. The strategies of OPC, voltage stability control of the inner LVDC bus, and output voltage sharing control of the IPOS-SABC modules are designed. Simulation results verify the correctness and efficacy of the designed generator and the corresponding governing strategies.