Research Of Characteristics Of Conducted And Radiated Emission And Suppression Of The System For More Electric Aircraft

With the development of the secondary electric power of the civilian aircraft, the demand and dependence of the electric energy of the aircraft is more and more high. A large number of cables,high power density motors, power actuators, multiple power converter and other electrical equipment produce stronger electromagnetic conduction and radiation, which have a serious adverse effect on the electromagnetic environment of the aircraft and the difficulty of the design of the conceptual scheme of the aircraft electric power system is increased. Therefore, the study on the electromagnetic conduction and radiation characteristics of the aircraft electrical system and its suppression method for reducing the electromagnetic interference of the system are of great theoretical and practical significance. Based on above reasons, we carry out a series of research work in this thesis, the main contributions are summarized as follows:(1) It has introduced the more electric aircraft and its electromagnetic environment, the mechanism and characteristics of electromagnetic interference are studied. The electromagnetic interference source and the interference path of the electric control system in the multi electric aircraft are analyzed in detail.(2) The crosstalk characteristics of aircraft cabin cable with different spacing, the distance of metal floor with different height and different length are studied. Electromagnetic simulations are used to analyze the influence of the distance of the distance between the cable, the distance between the cable and the metal floor and the length of the cable on crosstalk. The larger the distance, the closer the distance from the metal floor, the shorter the cable, the smaller the crosstalk effect on other cables. It is studied the radiation characteristics of the aircraft interior system connected by cables using the transmission line matrix(TLM) algorithm. The radiation characteristics of the chassis external cables and the inner cables are discussed, respectively. It is provided a basis for the reasonable arrangement of other electronic equipment and systems in the cabin interior.(3) It is modeled and analyzed for electrical control system, which is the highest power in the more electric aircraft, and determine its common mode equivalent circuit in the electromagnetic interference source. It is proposed that the excitation source method of the electromagnetic radiation model of the interference source is proposed, which can be used as the excitation source of the electromagnetic radiation model of the electric control system. It can effectively reduce the workload of modeling and the simulation time of the complex system.(4) The effects of shielding, filtering, grounding and other methods to reduce the electromagnetic interference of the system are analyzed in detail..