CAJ | 학술논문

现代军用多电飞机270V直流供电系统中的功率电子负载和电动机负载不断增加，这种负载因内部闭环控制而呈现恒功率的特性，即呈现出负阻抗特性，该特性与滤波元件间的相互作用会严重危害系统的稳定性。研究具有双级LC滤波器的恒功率负载系统的稳定性，建立基于混合势函数理论的数学模型，推导得到系统在大扰动条件下的稳定性判据。该判据是在考虑恒功率负载负阻抗大小的基础上，给出了滤波器元件参数的约束条件。分析及实验结果表明，该判据能够保障系统在大扰动下的稳定性，且结构简单，便于应用。
현대군용다전비궤270V직류공전계통중적공솔전자부재화전동궤부재불단증가，저충부재인내부폐배공제이정현항공솔적특성，즉정현출부조항특성，해특성여려파원건간적상호작용회엄중위해계통적은정성。연구구유쌍급LC려파기적항공솔부재계통적은정성，건립기우혼합세함수이론적수학모형，추도득도계통재대우동조건하적은정성판거。해판거시재고필항공솔부재부조항대소적기출상，급출료려파기원건삼수적약속조건。분석급실험결과표명，해판거능구보장계통재대우동하적은정성，차결구간단，편우응용。
In a 270 V DC power system of advanced aircraft, most of electrical motor drives and power electronic converters behave as constant power loads （CPLs） when tightly regulated, and usually cause negative impedance instability problems. This paper investigated the stability of the CPL with double-stage LC filters, and constructed the mixed potential model of the system based on Brayton-Moser＇s mixed potential theory, and then derived large signal stability criteria for the system. The presented criteria utilize the dynamic negative incremental impedance of the CPL to place design constraints on the filter parameters and thus prevent instabilities. Experimental results confirm that the simple and easily implemented criteria can guarantee the system stability under large disturbances.