Control-Based Stabilization of DC Microgrid for More Electric Aircraft

基于控制的多电飞机直流微电网稳定化

Electrifying the on-board subsystems of aircraft becomes an inevitable process as being faced with the environmental pollution,along with the proposed concept called more electric aircraft(MEA).With the increasing number of on-board power electronic based devices,the distribution system of the aircraft can be regarded as an onboard microgrid.As it is known that the load power electronic converters can exhibit constant power load(CPL)characteristics and reduce the system stability,it is necessary to accurately predict and enhance the system stability in designing process.This paper firstly analyzes the stability of an on-board DC microgrid with the presence of CPL.Then,discusses the reasons behind instability and proposes a control strategy to enhance system stability.Finally,the simulation results are worked out to validate the analysis and the effect of the proposed control strategy.

面对日益严峻的环境污染,飞机机载子系统的电气化过程已不可避免,相应的多电飞机(More electric aircraft,MEA)的概念也因此被提出。随着机载电力电子设备数量的增加,飞机上的配电系统可以被视作一个机载微电网。由于电力电子变换器工作时呈现恒功率负载(Constant power load,CPL)特性并降低系统稳定性,在设计系统时需要精确预测并增强系统的稳定性。文中首先分析了包含CPL的机载直流微电网的稳定性,然后探讨了不稳定现象背后的原因,并提出了对应的控制策略来增强系统稳定性,最后通过一系列的仿真结果来验证稳定性分析的准确性以及所提控制策略的效果。