计及柔性安全裕度的多电飞机负载转供策略

采用多电飞机电气系统的节点电压柔性表示可变的运行点安全裕度,提出考虑飞机运行工况和变频启动发电机故障位置的离线最优负载转供策略。首先,基于同一工况下负载相关关系构建多维联合分布函数,结合蒙特卡洛法生成表征负载不确定波动的大量场景,并利用Ward系统聚类进行场景削减。然后,以增大系统电压柔性和降低网络损耗为目标,建立了负载转供柔性优化模型。同时,为提高计算收敛性和速度,对NSGA-Ⅱ算法进行改进,最终结合TOPSIS分析得到Pareto最优折中解。应用实际Boeing 787电气系统进行分析,结果表明,改进NSGA-Ⅱ算法具有更快的收敛速度和更佳的优化结果,且本模型得出的转供策略对比传统方式在提升运行安全性与经济性方面有一定效果。

Optimal Load Transfer Strategy for More Electric Aircraft Including Flexible Safety Margin

An offline optimal load transfer strategy of more electric aircraft considering operation mode and fault location of variable frequency starter generator is proposed. Firstly, a series of scenes that show the fluctuation of load in different operation mode are generated through the Monte Carlo Method and Multi-dimensional Joint distribution function, and are cut down by the Ward clustering method. Then, the multi-objective load transfer flexible optimal model can be built. Meanwhile, to enhance the global convergence as well as shorten calculation time, an improved Non-dominated Sorting Genetic Algorithm-II (NSGA-II) algorithm is applied for solving out above model. And the Pareto optimal solution can be obtained using Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) analysis. An example is made based on actual Boeing 787 electrical system, and the results show that, improved NSGA-II algorithm is benefit for speeding up the convergence rate and obtaining better optimal effect. Besides, the comparison between traditional manner and proposed strategy points out that, the proposed method has a certain effect on improving the network security and economic efficiency.