Abstract and Applied Analysis
Volume 2013 (2013), Article ID 387167, 9 pages
http://dx.doi.org/10.1155/2013/387167
Research Article

Voltage Stability Bifurcation Analysis for AC/DC Systems with VSC-HVDC

Yanfang Wei,1 Zheng Zheng,1 Yonghui Sun,2 Zhinong Wei,2 and Guoqiang Sun2

1School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China
2College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China

Received 24 January 2013; Accepted 1 March 2013

Academic Editor: Chuangxia Huang

Copyright © 2013 Yanfang Wei et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A voltage stability bifurcation analysis approach for modeling AC/DC systems with VSC-HVDC is presented. The steady power model and control modes of VSC-HVDC are briefly presented firstly. Based on the steady model of VSC-HVDC, a new improved sequential iterative power flow algorithm is proposed. Then, by use of continuation power flow algorithm with the new sequential method, the voltage stability bifurcation of the system is discussed. The trace of the P-V curves and the computation of the saddle node bifurcation point of the system can be obtained. At last, the modified IEEE test systems are adopted to illustrate the effectiveness of the proposed method.