异步电机起动/发电系统起动向发电的转换研究

Research on the Conversion from Starting Mode to Generating Mode of Induction Machine Starter/Generator System

用异步电机与电力电子变换器结合构成的起动/发电系统作航空电源是一个很有意义的课题。对异步电机起动/发电系统中起动向发电的转换进行了研究,提出充分利用系统中变换器可快速控制定子磁链转速的特点,改变电磁转矩的方向,实现起动到发电的转换。详细介绍了转换过程控制方案,该方案可实现起动到发电的平滑转换,且在进入发电状态后直流母线电压由起动电源电压自动增长到所需的发电电压,最终稳定发电。最后给出了仿真与实验结果。

Starter/generator aero power system which is composed of induction machine and power electronic converter is significant. In this paper, the conversion from starting mode to generating mode of the induction starter/generator system is researched. The system has a feature that stator flux linkage rotate speed can be fast controlled by the converter. By means of this feature, the direction of electromagnetic torque can be changed, and the system can convert from starting mode to generating mode. The conversion scheme is introduced in detail. Using the conversion scheme, the system can convert from starting mode to generating mode smoothly, and after turning into generating mode, DC link voltage increases from low voltage of starting power supply to the voltage needed by the system, finally the system can generate stably. Simulation and experimental results are also presented.