变频交流发电系统双定子绕组异步发电机低载波比控制

摘要

With the development of more electric/all electric aircraft,Variable Frequency AC Generation SYSTEM (VFAC SYSTEM) has been widely used in large civil aircraft.In this paper,the VFAC generator system based on the Dual-Stator Winding Induction Generator(DWIG) is discussed,which has the feature of high power output per single generator and high fundamental frequency.Generally,the switching frequency of the high power device does not exceed 5 kHz,so how to ensure the quality of the system output voltage and the dynamic performance with limited carrier ratio becomes the focus of the study.In this paper,the Specific Harmonic Elimination Pulse-Width Modulation (SHEPWM) is adopted and the carrier ratio changes with different fundamental frequency range,thus the system's switching loss is limited while the output voltage's quality remains good.As SHEPWM does not have the function of real-time control,Flux Trajectory Tracing Control (FTTC) is adopted to improve slip-frequency control.Simulation and experiment prove the correctness and effectiveness of the method proposed,which can be also used for medium frequency inverter.%随着多电全电飞机的发展,变频交流(VFAC)电源发电系统已广泛应用于大型民用飞机之中.VFAC系统的主发电机具有功率大、基波频率高的特点,而大功率器件的开关频率通常不高于5 kHz,因此,如何在有限载波比下保证输出电压波形质量及动态性能成为了研究的重点.基于双定子绕组异步电机(DWIG) VFAC发电系统,利用特定次谐波消除脉宽调制法(SHEPWM),针对不同的基波频率段选择不同的载波比,在保证波形质量的同时做到开关频率最低.针对SHEPWM无法实时控制的问题,采用磁链追踪控制(FTTC)对SHEPWM调制进行了改进,保证了系统动态性能,仿真和实验验证了方法的正确和有效性.低载波比控制方法不仅可以应用于变频交流发电系统,而且同样适用于中频变换器等场合.