双馈发电机最大风能捕获和转换策略的仿真

Simulation for Strategy of Maximal Wind Energy Capture and Conversion of Doubly Fed Induction Generators

为了最大限度地利用风能,提高风力发电系统的效率,提出了一种既可实现双馈发电机系统低于额定风速下的最大风能捕获又可使得电机铜耗最小化运行的优化控制策略。在分析风力机特性和双馈发电机基本电磁关系的基础上,推导了双馈发电机实现最大风能捕获和转换的定子有功功率和无功功率的数学模型,并应用基于动态同步轴系下的双馈发电机励磁控制策略实现了系统的最优控制。利用Matlab/Simulink对不同风速下双馈发电机系统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和可行性。

In order to most effectively utilize the wind energy and improve the efficiency of wind generation system, an optimum control strategy of doubly fed induction generators （DFIG） was proposed, which made the system operation for both the maximum wind energy captured below the rated wind speed and copper loss-minimization. Based on the wind turbine characteristics and basic electromagnetic relationship of DFIG, the mathematical models of the stator active power and reactive power of DFIG were derived to fulfill maximal wind energy capture and conversion. A dual-passage excitation control strategy based on dynamic synchronous reference frame was applied to control the proposed optimal stator active and reactive power. The operational performances of the wind turbine system with DFIG with wind speed variation were analyzed and compared by using Matlab/Simulink. The results show the correctness and feasibility of the proposed control strategy.