模块化定子永磁风力发电机及其控制

针对海上风能开发和利用,提出和设计了一种新型结构的永磁风力发电机。所提出的电机由多个空间均匀移相的模块化定子永磁发电机(MSPMG)组成,每个MSPMG是独立的单相双凸极电机,每个定子模块包含永磁、齿极和线圈,减小了模块间的磁耦合和线圈互感。通过分析MSPMG的电磁特性和发电原理,基于变分原理推导出MSPMG的最优功率控制策略,利用单相H桥全控整流电路实现了对电枢电流的控制。有限元分析证明MSPMG各个模块间的磁路耦合很小,运行状态相互独立,因此该电机具有很强的容错运行能力。基于软件仿真证实了所设计电机及其控制策略的正确性和有效性。

Modular Stator Permanent Magnet Wind Power Generator and ItsControl Strategy

Aiming at offshore wind energy development and utilization, a novel permanent magnet wind power generator was proposed and designed. The proposed electric machine consisted of multiple modular stator permanent magnet generators (MSPMGs) with uniform spatial phase shifting and each MSPMG was singlephase doubly salient electric machine with modular stator containing permanent magnet and toothed winding structures, which significantly reduced the magnetic coupling and mutual inductance between modules. By analyzing the electromagnetic torque and power characteristics of MSPMG, the optimal power control strategy of MSPMG was deduced based on variational principle and the optimal armature current control was realized by using singlephase Hbridge controllable rectifier. The results of finite element analysis indicated that the coupling coefficient between different modules of the MSPMG was very small due to the isolated magnetic circuits, so the proposed machine had strong operating capability of fault tolerance. Simulation results verified the correctness and effectiveness of the designed electric machine and the corresponding control strategy.