全电飞机电力系统多级可靠性分析与多目标优化设计方法

This paper proposes a multi-objective optimization design method based on multi-level reliability analysis to ensure higher reliability and safety of all-electric aircraft power system. With this method, the complex all-electric aircraft power system design process is decoupled into two levels, and a nonlinear optimization model is established for each level by considering such indexes as cost and reliability. Then hierarchic analysis is carried out to determine the weight coefficients and simplify the multi-objective optimization problem into a single-objective optimization problem by using such weight coefficients. Meanwhile, a nonlinear model is linearized into a 01 programming model and the optimal power system topology and rated power of each power device under different weight coefficients are obtained by solving this model. According to the analysis results of design under different weight coefficients, the following conclusions are made: Under a low weight coefficient of reliability, the all-electric aircraft power system has a simple topology with low costs; Under a high weight coefficient of reliability, the all-electric aircraft power system has a complex topology with high costs. Simulation results show that this method can optimize the design in cost, reliability and other indexes. This reflects that this method is of good guiding significance in the initial design of all-electric aircraft power system.