摘要
现代军用多电飞机270 V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。
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.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2011年第27期29-35,共7页
Proceedings of the CSEE
基金
国家自然科学基金项目(50677001)~~
关键词
恒功率负载
混合势函数模型
负阻抗
大扰动
constant power loads （CPLs）
Brayton-Moser＇s mixed potential model
negative incremental impedance
large disturbances
