双馈异步发电机的不同目标优化控制

在变速恒频风力发电系统中，双馈异步发电机的设计和控制直接关系到系统的经济成本和机组的运行效率。文章从不同控制目标的角度出发，提出全补偿、最小铜损、转子电流最小3种电机优化控制方式。建立不同方式下控制信号的数学模型，指出定、转子有功、无功功率的关系及各种方式控制性能的优缺点和适用场合。最后对1.5 MW双馈异步发电机在不同控制方式下的运行特性进行比较，验证了上述关于运行特性分析的正确性。

Different Objectives Optimal Control for Doubly-Fed Induction Generator

As for variable speed constant frequency (VSCF) wind power generation system, the design and control of doubly-fed induction generator (DFIG) directly relate to the economic cost of generation system and operation efficiency of units. From the viewpoint of different control objectives the authors propose three optimal generator control modes, they are complete compensation, the least copper loss and minimum rotor current. The mathematic models for control signals under different modes are built, the relations between active power and reactive power in stator and rotor are revealed, the respective advantages and shortcomings of the three control modes as well as their applicable situations are pointed out. Finally, the operation characteristics of DFIG with capacity of 1.5 MW under different control modes are compared to validate the correctness of above-mentioned analysis.