Data Acquisition And Stability Analysis Of Aircraft Power System

With the development of power electronics technology,the power system of multi-electric aircraft gradually replaced other energy systems to become the secondary energy system on the aircraft,and has become a trend in the development of aircraft power systems.For the negative impedance characteristic of the constant power load composed of the power electronic devices can cause the unstable influence on the operation of the aircraft power system,it is very important to analyze the stability of the aircraft power system caused by the sudden change of the constant power load and the change of the transmission line.Firstly,based on the dq coordinate system,the mathematical and physical models of the12-pulse pulse rectifier circuit with constant power load in the aircraft power system are established.The stability method based on impedance ratio is used to analyze the impact of system stability with the changes of the load power and the variation of the parameters of the different lines.Secondly,aiming at the problem of instability of aircraft power system,two kinds of strategies,such as passive damping compensation and active damping compensation,are used to improve the stability of aircraft power system.Finally,the design and development of the data acquisition system part of the aircraft power simulation system stability platform is completed,and the effectiveness of the acquisition system is verified by experiments.The simulation reveals that the constant power load carried by the constant voltage load12-pulse voltage rectifier circuit should be limited in a certain range to avoid instability situation.In addition to that,configuration parameters of the transmission cable,transformer rectifier and a filter,etc.will have some impact on the stability of the system that is embodying in that capacitance,resistance increases and filter inductance reduction can improve system stability.In the system stability compensation strategy,by increasing the DC filter and increase the closed-loop control loop based on the eliminating CPL path,can be to a certain extent,improve the stability of the system.