Hybrid algorithm for rotor angle security assessment in power systems

The Journal of Engineering

D. Prasad Wadduwage¹  Udaya D. Annakkage¹  Christine Qiong Wu² 

[1]Department of Electrical and Computer Engineering, University of Manitoba, Winnipeg, MB, R3T 5V6, Canada

[2]Department of Mechanical and Manufacturing Engineering, University of Manitoba, Winnipeg, MB, R3T 5V6, Canada

关键词: Prony algorithm;    rotor angle security assessment;    oscillatory rotor angle stability assessment;    50-generator 470-bus test system;    transient rotor angle stability assessment;    computational burden;    LE concept;    damping ratio;    16-generator 68-bus test system;    power system fault;    Lyapunov exponent concept;    DSA;    dynamic security assessment;   

DOI  :  10.1049/joe.2015.0033

学科分类：工程和技术（综合）

来源: IET

【 摘 要 】

Transient rotor angle stability assessment and oscillatory rotor angle stability assessment subsequent to a contingency are integral components of dynamic security assessment (DSA) in power systems. This study proposes a hybrid algorithm to determine whether the post-fault power system is secure due to both transient rotor angle stability and oscillatory rotor angle stability subsequent to a set of known contingencies. The hybrid algorithm first uses a new security measure developed based on the concept of Lyapunov exponents (LEs) to determine the transient security of the post-fault power system. Later, the transient secure power swing curves are analysed using an improved Prony algorithm which extracts the dominant oscillatory modes and estimates their damping ratios. The damping ratio is a security measure about the oscillatory security of the post-fault power system subsequent to the contingency. The suitability of the proposed hybrid algorithm for DSA in power systems is illustrated using different contingencies of a 16-generator 68-bus test system and a 50-generator 470-bus test system. The accuracy of the stability conclusions and the acceptable computational burden indicate that the proposed hybrid algorithm is suitable for real-time security assessment with respect to both transient rotor angle stability and oscillatory rotor angle stability under multiple contingencies of the power system.

【 授权许可】

CC BY