Transient stability analysis and control of power systems with considering flux decay by energy function approach

Bulletin of the Polish Academy of Sciences. Technical Sciences

D. LuSchool of Electronic, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaOther articles by this author:De Gruyter OnlineGoogle Scholar¹  X. ZhangSchool of Electronic, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaOther articles by this author:De Gruyter OnlineGoogle Scholar¹ 

[1] School of Electronic, Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

关键词: Keywords: transient stability;    dynamic performance;    flux decay;    structure preserving models;    energy function;   

DOI  :  10.2478/v10175-012-0001-1

学科分类：工程和技术（综合）

来源: Polska Akademia Nauk * Centrum Upowszechniania Nauki / Polish Academy of Sciences, Center for the Advancement of Science

【 摘 要 】

In this paper, transient stability of power systems with structure preserving models is considered. A Hamiltonian function which can be regarded as a Lyapunov function for the system is proposed. Based on this, the influence of flux decay dynamics, especially during a fault, on transient stability is analyzed. With the increase of load power, the variation of stability boundary in the rotor angle/E'q plane is shown. The Energy-based excitation control, aiming at injecting additional damping into the post-fault system may reduce the critical clearing time (CCT). This can be demonstrated by the comparison of different flux decay dynamics in the fault-on condition, and the reason is illustrated by the relationship between rotor angle/E'q and the stability boundary. An improved control strategy is proposed and applied to increase the CCT. Simulation results verify that improvement is obtained both in transient stability and dynamic performance.

【 授权许可】

Unknown