Modeling And Stability Analysis Of Aircraft Power System

Aircraft power system,as the core system of MEA,has become a hot research field in aviation industry.However,China civil aircraft power system started slowly relatively.The level of research is relatively low.Western leading airlines having been blocking technology for China.China civil aircraft manufacturing industry is forced to develop integrated power system independently.With the rapid development of MEA,power electronic converters is becoming more and more widely in the aircraft power system.Aircraft power system has features of independence,the power system in parallel,multi-converter cascade,various characteristics of the power load.Aircraft power system will have a large disturbance impact in the take-off,climb cruise,landing and other conditions switching,which makes the aircraft power system transient process often involves a large number of non-linear characteristics.Compared with the traditional power system,the aircraft power system is a non-linear system with a high degree of electronic power.If the traditional linear modeling method was applied directly to analysis the nature of transient phenomenon,it has own theoretical limitations.In the study of basic theory of civil aircraft power system analysis,the generalized state space average theory modeling method is proposed based on the state space average theory.Also generalized state space average model of aircraft power components including aircraft power 12-pulse inverter were constructed.The accurate mathematical model of power components is a prerequisite to guarantee accuracy of stability analysis.Considering the AC / DC and its interaction,the average model of the MEA power system including the generator,transformer rectifier and electromechanical actuator is established.This model is aiming at the large disturbance stability analysis of the whole power system.The stability field of the system is solved by using the mixed potential function theory and Lyapunov stability theorem.Finally,the method is verified by the "point-by-point method" and detailed numerical simulation.The results of this study will provide a generalized state space average modeling method which explore the nonlinear nature of power components in aircraft power system.It is more actual in process of the system.It provides the necessary theoretical basis for the large disturbance stability analysis of the aircraft power system and constructs the necessary theoretical analysis for the overall development of the civil aviation power system and the optimization design of the system parameters.