摘要
建立滞环电流控制SEPIC变换器的连续时间模型,采用解析及数值方法研究其中出现的低频不稳定现象.给出系统发生Hopf分岔的充要条件,确定系统参数的稳定区域,揭示系统中Hopf分岔现象产生、发展的机理.研究结果表明:系统中出现的低频不稳定现象是由Hopf分岔导致的,SEPIC变换器电路本质上的惯性特性是系统产生Hopf分岔的根本原因.
A continuous-time model was developed for a hysteresis current-controlled SEPIC converter.The low-frequency instability in it was researched with analytical and numerical methods.The sufficient and necessary conditions for occurrence of Hopf bifurcation in the system were given,stable region of system parameters was determined,and the mechanism of occurrence and development of Hopf bifurcation phenomenon was revealed.It is shown by the investigation result that the low-frequency instability occurred in system was caused by Hopf bifurcation and the essential reason of occurrence of Hopf bifurcation resided in the inherent inertia behavior of the SEPIC converter.
出处
《兰州理工大学学报》
CAS
北大核心
2011年第4期78-83,共6页
Journal of Lanzhou University of Technology
基金
宁夏自然科学基金(NZ0954)
宁夏高等学校科学研究基金(2010JY004)
关键词
滞环控制
低频不稳定
单端初级电感变换器
霍普夫分岔
hysteresis control
low-frequency instability
single-ended primary inductive converter
Hopf bifurcation
