直驱式永磁同步风力发电机组建模及其控制策略

以永磁体励磁多极直驱式同步风力发电机组(directly driven wind turbine with permanent magnet synchronous generators，D-PMSG)为对象，建立了包括风力机模型、传动系统模型和发电机模型的D-PMSG数学模型，提出了风力机桨距角和发电机转速的控制策略：桨距角的控制策略中以风速和发电机功率为输入信号，采用比例–积分控制很好地反映了不同风速对桨距角控制的不同要求；发电机转速控制策略中采用dq同步旋转坐标下的矢量控制方法，用d轴电流控制无功功率，用q轴电流控制转速，既实现了机组的解耦控制，又充分利用了发电机容量。运用Matlab/Simulink建立了D-PMSG仿真模型，对风速阶跃变化时机组运行情况进行了仿真，结果验证了该模型的合理性及控制策略的正确性和可行性。

Modeling and Control Strategies of Directly Driven Wind Turbine with Permanent Magnet Synchronous Generator

The paper addresses the issues associated with modeling and controlling of directly driven wind turbine with permanent magnet synchronous generators (D-PMSG). A complete model of D-PMSG has been built, which includes wind turbine model, drive train model and generator model as well. In accordance with the variation of wind speed, strategies for pitch angle control and rotational speed control are developed. For the pitch angle controller, wind speed signals and generator output power are used as inputs and proportional-integral control is implemented, which directly represents the dependence of pitch angle control on wind speed. For the rotational speed controller, vector control method in the dq synchronous rotational frame is employed, where the d-axis current component is used to control reactive power and the q-axis current component to control the rotational speed. This concept offers the benefits not only of decoupling control but also of high utilization of generator capacity. The model of D-PMSG and the proposed control strategies have been realized with the engineering software, Matlab/Simulink. Simulation for the case of wind speed stepping change verifies the validity of the model and the feasibility of the control strategies.