无刷双馈电机控制策略的研究

Study on Control Strategy for Brushless Doubly-fed Machine

为扩大无刷双馈电机的稳定运行范围,本文提出利用电机的瞬态模 型研究电压跟踪频率的关系,并根据电机的稳态模型以电机性能最佳为条件优 化计算出控制电压与频率的单值关系。并与电压频率比恒定控制作了比较,结 果表明采用本文提出的方法能有效地扩大电机的转速运行范围和获得良好的运 行性能。本文提出的无刷双馈电机控制策略,为系统地进行无刷双馈电机电气 传动系统和变速恒频风力发电系统的设计与控制奠定了基础。

In order to extend the stable operation range of the brushless doubly-fed machine(BDFM), a method to determine the control relationship between the voltage amplitude and frequency of the control winding by the transient state model of BDFM is presented in this paper. Meanwhile the steady state performances in the stable operation range for the different voltage value are calculated by the steady state model of BDFM. According to the perfection performances, the final voltage value for the every operation frequency is decided. By means of the method presentd in this paper, the calculation results for the stable operation range and the steady state operation performance of a sample BDFM are carried out and compared with the control strategy of constant V/Hz ratio. Resuls show that the method presented in this paper appears good in the extending stable operation range and the steady state performances for BDFM. Together with the method of control strategy research proposed in this paper, the electromagnetic design of BDFM can construct a foundation for development of the BDFM drive system and the variable speed constant frequency power generation system.