飞机起动/发电机励磁系统特性研究

Study on Synchronous Generator Excitation System

为了简化现有飞机SSG励磁机控制策略和提高起动性能,对SSG励磁系统特性进行了深入的研究和总结,分别建立了励磁系统在三相和两相静止坐标系下的数学模型,采用旋转坐标变换的方法统一变换到旋转d-q坐标系下,且通过提高工作频率和引入转速反馈的方法解决定子电抗和转子转速变化对系统输出的影响,并在Simulink环境下设计仿真模型,对系统的特性进行仿真实验和分析,证明了采用该方法可以使励磁机绕组的输出电压和频率保持基本恒定,且直流侧电流也接近于理想值。

In order to simplify the control strategy and improve starting performance of synchronous starter/generator(SSG),the SSG excitation characteristics of existing excitation schemes are thoroughly studied and summarized.Mathematical models under both three-phase and two-phase static coordinates are established,and a unified rotating d-q coordinates mode of this mathematical model is achieved by using the methods of coordinate transform.By increasing the working frequency and rotate speed feedback,the problem of stator reactance and rotor speed influenced on system output is solved.By building the simulation model based on Simulink9the simulation experiment is conducted and the systems characteristics are analyzed.The results shows that this method make the output voltage and frequency of the excitation winding remain constant,and the current value is close to the ideal value.