交流励磁变速恒频双馈型异步发电机的稳态功率关系

在交流励磁变速恒频发电应用中,双馈型异步发电机(DFIG)的控制对象是定子有功、无功功率,控制变量是转子电压、电流.采用DFIG等效电路,推导基于DFIG控制对象的转子电压、电流计算方法,将转子电压、电流分解为励磁分量、有功分量及无功分量,揭示了DFIG控制对象与控制变量之间的内在联系;研究定、转子的有功、无功功率关系,重点对不同运行条件下DFIG无功功率特性进行探讨,分析DFIG转子无功功率和定子无功功率以及转差之间的关系.

Steady-State Power Relation of AC-Excited Variable-Speed Constant-Frequency Doubly-Fed Induction Generator

In the occasion of AC-excited variable-speed constant-frequency electricity generation, stator active power and reactive power are the control objects, while rotor voltage and current are the control variables of doubly-fed induction generator(DFIG). Based on DFIG equivalent circuit, the calculation method of rotor voltage and current with the control objects, together with the decomposability of rotor voltage and current into excitation component, active power component and reactive power component, is discussed in the paper to explain the inherent relation between control objects and control variables. The active power and reactive power of stator and rotor, especially the reactive power characteristics under different operation conditions are investigated. Furthermore, the relation ship between rotor reactive power, stator reactive power and slip are analyzed.