Wind turbine systems are constructed using different types of generators, aero-mechanical components and control systems. Due to their ability to work in low speed, Axial Flux Permanent Magnet (AFPM) generators are becoming widespread in wind energy systems which contributes to eliminating the gearbox from the system, noticeable increase in efficiency and decrease in system weight. Due to the modular nature of the stator in AFPM generators, it is possible to control each module independently. In this paper, in addition to obtain the dynamic model of the turbine and AFPM generator, a control strategy is designed based on Mixed Integer Nonlinear Programming (MINLP) to incorporate both pitch angle and the number of active stator modules as control input signals. These control signals are used in order to maximize system efficiency and regulate output voltage in different wind speeds and electrical loads. Simulation results for a typical generator shows the effectiveness of the proposed method in speed control of the generator.

风力涡轮机系统由不同类型的发电机、航空机械部件和控制系统构成。由于能够在低速下工作，轴向磁通永磁 (AFPM) 发电机在风能系统中变得越来越普遍，这有助于从系统中去除齿轮箱，显着提高效率并减轻系统重量。由于 AFPM 发电机定子的模块化特性，可以独立控制每个模块。在本文中，除了获得涡轮机和 AFPM 发电机的动态模型外，还设计了一种基于混合整数非线性规划 (MINLP) 的控制策略，将桨距角和有源定子模块的数量作为控制输入信号。这些控制信号用于最大限度地提高系统效率并在不同风速和电力负载下调节输出电压。典型发电机的仿真结果表明了所提出的方法在发电机速度控制中的有效性。