直驱永磁风力发电系统的建模与稳定控制

Modeling and Control Strategies of Direct Drive Permanent Magnet Wind Power Systems

本文针对直驱永磁风力发电（Direct-drive Permanent Magnet Generator）系统，建立了包括风速、风力机、永磁同步发电机以及变流器的整体数学模型；提出了以风速作为输入信号，以控制变流器并网电流为实现手段的最大风能获取控制；在逆变控制中，采用dq同步旋转坐标下的矢量控制方法，建立了引入电流反馈的直接电流控制策略，实现了风力发电系统的有功和无功的解耦控制。运用电力系统仿真软件PSCAD／EMTDC建立了直驱永磁风力发电系统的仿真模型，对常风速、阵风以及系统故障时机组的运行情况进行了仿真分析，结果验证了本文提出的最大风能获取的控制原理的正确性，验证了直驱永磁同步发电系统在电网故障时良好的低电压穿越能力。

The paper based on the Direct-drive Permanent Magnet Generator System （D-PMSG）, A complete model has been built include wind speed, wind turbines, permanent magnet generator and the convertor. To control the generator speed and achieve the MPPT （Maximum Power Point Tracking） algorithm, a speed controller with the wind speed as the input signal, the into grid circuit has been controlled; Based on the coordinate vector transformation and voltage-decoupled vector control technology, separated the wind power＇s active and reactive power and decoupled and direct-circuit control method control; The model of D-PMSG and the proposed control strategies have been realized with the power system simulation software PSCAD/EMTDC, the simulation results verifies the validity of the model and feasibility of the control strategies.