双馈电机复功率特性研究及四维分析

Complex Power Characteristics of Doubly-Fed Induction Machine and Its Four Dimension Analysis

详细分析了双馈电机等效电路推导过程,指出机电能量转换过程中机械轴的作用在相等效电路中的体现方式,定义了相等效电路中机械有功功率和机械无功功率,提出从定子侧看双馈电机机电能量转换过程中复功率守恒的观点。针对超同步工况下转子频率为负值的特点分析了负频率相量的复功率特点以明确超同步转子无功功率特性。采用四维图的表现形式使双馈电机在不同转速、定子有功功率和定子无功功率条件下的运行特性明晰直观地表现出来。

The derivation of the equivalent circuit of Doubly-Fed Induction Machine（DFIM） is thoroughly researched and the shaft＇s function reflected in phase equivalent circuit is explained.The mechanical active and reactive power is defined and the conservation of complex power in the conversion of electro-mechanical energy of DFIM is proposed.As the frequency of rotor is minus when DFIM is running at super synchronous speed,the complex power of minus frequency circuit is researched.The result is applied in the reactive power analysis of DFIM.The characteristics of DFIM in the three dimension space constructed by stator active power,reactive power and slip is illustrated in four dimensions to obtain a simple and clear view.