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.