双馈风力发电机双PWM变换器协同控制

Coordinated control strategy for dual-PWM converter in doubly fed wind generation system

基于两相旋转d-q坐标系下双馈风力发电机转子侧和网侧变换器的数学模型,设计了单神经元自适应控制器和谐振控制器,提出了网侧和转子侧变换器的协同控制策略。基于电网电压定向的解耦控制,转子侧变换器实现对定子侧输出有功功率和无功功率的跟踪调节,网侧变换器维持直流母线电压稳定和调节功率因数。该方法能够对交流输入信号实现无静差控制,能够实现对系统自身产生的低次谐波进行补偿。仿真分析表明,该控制策略不仅能通过精准的电流调节达到协同控制的目的,而且提高了控制系统的鲁棒性和电网电能的质量。

Based on the mathematical model of the rotor side and grid side converter of the doubly fed induction turbine generator under the two-phase synchronization d-q reference frame,single neuron adaptive controller and resonant controller are designed,and the cooperative control strategy of the grid side and the rotor side converter is proposed. The rotor side converter realizes the decoupling control of power and reactive power of the rotor side,and the grid side converter keeps DC bus voltage stable and adjusts power factor based on the grid voltage orientation. The proposed strategy can realize no static error control for the AC input signal,and can compensate the low-order harmonics produced by the system itself. Based on simulation analysis,the control strategy can not only achieve the purpose of cooperative control through accurate current regulation,but also improve the robustness of the control system and the quality of the power grid.