孤岛双馈风力发电机组最大风能捕获策略

Capture Strategy of Maximizing Wind Energy for Stand- Alone Doubly- Fed Induction Wind Generators

在分析孤岛双馈风力发电机组最大风能捕获原理的基础上,提出了一种通过控制负载侧变换器功率使电机转速随风速变化以实现最大风能捕获的控制策略。首先,采用改进的孤岛双馈风力发电系统拓扑结构,分析其功率关系。其次,根据负载侧变换器的数学模型及系统功率关系,建立了孤岛双馈风力发电机组最大风能捕获的控制策略。最后,利用MATLAB/Simulink对不同风速下孤岛双馈风力发电机组的运行性能进行了分析和比较,结果验证了该控制策略的正确性与有效性。

Based on analyzing the capture strategy of maximizing the wind energy for stand-alone wind turbines based on doubly-fed induction generators（ DFIG）, a capture strategy was proposed by controlling the the power of stator convertor tomake motor speed change with wind speed in order to capture maximal wind energy. Firstly, a new topological structure of stand-alone DFIG system was used, and its power relationship was analyzed. Then, the strategy of maximizing the wind ener- gy for stand-alone wind turbines based on DFIG was proposed by controlling the power of stator convertor. Finally, the oper- ational performances of stand-alone wind turbines based on DFIG with wind speed variation were analyzed by using MAT- LAB/Simulink. The results show the correctness and feasibility of the proposed control strategy.