Research On Characteristics Analysis And Management Of MEA Electrical Loads

With the development of More Electric Aircraft and All Electric Aircraft,a new structure of aircraft electrical system was formed.The mechanical,hydraulic and pneumatic loads directly driven by the engine were replaced by electrical loads.The multi-electrification loads bring transient voltage and current impact on the stability of power systems and power quality.Energy storage devices can realize the storage of electrical energy,stabilize the system,reduce the fluctuations caused by high-power loads,add the emergency function and so on.It's an effective measure to solve multi-electrification load effects.The load fluctuations affect the quality of power supply,in order to solve this problem,this paper takes more electric aircraft HVDC system as the background and carries out the management strategy research which is concerned with the aircraft multi-electrif ication load based on energy storage.It mainly includes the following contents:First of all,the characteristics of typical electro-hydraulic,electro-mechanical and electro-pneumatic loads are analyzed.EHA model is set up in MATLAB to analyze fluctuations caused by the high-power mutation of the multi-electrif ication loads and the regularity of influence on power system,which provides a reference for energy storage system power management.According to the energy fluctuation in the process of multi-electrification load operation,the design requirements of the energy storage device for the multi-electric HVDC system are analyzed.By comparing the various energy storage design schemes of the aircraft load management,the super capacitor design is then to be confirmed.Based on the current source half bridge bi-directional DC/DC power converter,the super capacitor energy storage system is designed,and the super capacitor energy management strategy is introduced.According to the voltage of the 270 V high voltage DC bus and the SOC of super capacitor,it can work in a automatic state,to suppress the load fluctuations and reduce the impact of t he variations on the power system.Finally,the aircraft HVDC system experiment platform is built to verify that the effect of the energy management strategy.The experimental results show that the energy management strategy can effectively reduce the influence of load fluctuation and improve system reliability and stability.