Journal of South China University of Technology (Natural Science Edition) ›› 2006, Vol. 34 ›› Issue (10): 77-82.

• Power & Electrical Engineering • Previous Articles     Next Articles

Stability Analysis of Boost Converter Based on Diferential Dynamic Theory

Cai Li-juan  Hu De-cheng  Liu Yong-Gang   

  1. School of Electric Power,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2005-09-06 Online:2006-10-25 Published:2006-10-25
  • Contact: 蔡丽娟(1949-)，女，副教授，主要从事控制理论在电子系统中的应用研究 E-mail:etljcai@scut.edu.cn
  • About author:蔡丽娟(1949-)，女，副教授，主要从事控制理论在电子系统中的应用研究

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Abstract:

The stability of Boost converter is analyzed based on the differential dynamic theory and the state-space.average model,with the feedback parameters kl and k,as the bifurcation variables.Several unstable behaviors and the corresponding stability criteria are thus revealed.The results indicate that.when the duty radio of the converter is salurated,the converter is open-looped,with an unstable output voltage due to the load variation,and that when the duty radio is unsaturated and the modelis nonlinear.the eigenvalues of Jacobian matrix.which result in the stable or unstable behaviors of the system,are the functions of system parameters.A qualitative analysis of the relationship between system parameters and the stability is finally carried out,the corectness of which is verified by Matlab simulation.

Key words: differential dynamic system, Boost converter, stability, eigenvalue, bifurcation