多电飞机变速变频电力系统的发电机之间无法并联供电，通常采用冗余供电方式来提高供电可靠性。为模拟仿真多电飞机变速变频电力系统的运行状态，展现故障情况下的电源切换过程，在分析变速变频电力系统结构及主要器件原理的基础上，基于Simulink平台，利用功能性建模方法搭建了包括变频发电机、汇流条控制单元、整流器等主要元件在内的综合仿真模型，并利用逻辑元件实现了电源切换功能建模，最后用算例进行了稳态状态下模拟仿真和故障状态下电源切换验证。

To improve the power supply reliability,the generators of More Electric Aircraft (MEA) Variable Speed Variable Frequency (VSVF) Electrical Power System (EPS) are used as redundant power supplies instead of parallel power supply.To study the steady state operation and power source change strategies under malfunction conditions of VSVF EPS,the integrated structure of VSVF EPS is illustrated and operating principles of components are analyzed.The key components,including variable frequency generators,bus power control unit,rectifiers and other supplementary elements,are then simulated by a comprehensive VSVF EPS model established on the platform of Simulink,and the power source change strategies are realized by logic units.Finally,case study is made for simulation of normal operation state and verification of power source exchange under malfunction state.