Abstract
A hybrid AC/DC power buffer converter topology is proposed in this paper to solve the stability problem HVDC bus of electric propulsion aircraft which is caused by constant power load characteristics and energy regeneration from the propulsion motor. It can effectively alleviate the impact of the energy feedback from the motor-driven type load on the stability of the HVDC bus, and also reduce the impact of the voltage disturbance of the aircraft electrical power generation subsystem on the HVDC bus voltage stability. In order to achieve the goal, the topology and power flow analysis of the power buffer converter is first performed. Secondly, the power control strategies of power buffer converter are presented based on decentralized fuzzy logic control (DFC) and centralized finite control set model predictive control (FCS-MPC). Thirdly, the digital simulation of two control algorithms is built on MATLAB/Simulink platform, furthermore the results are compared and analysed. Finally, the power buffer converter based on FCS-MPC is verified on Typhoon HIL604 HIL platform. The HIL experimental results verify that the power buffer converter has good performance in stabilizing high voltage DC bus voltage of distributed electrical propulsion aircraft.
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