Using trajectory sensitivity analysis to find suitable locations of series compensators for improving rotor angle stability

•Suitable placement of series compensators using trajectory sensitivity analysis.•Improving both the transient and small signal stability of power system.•Demonstrating the situations where series compensation may worsen the stability.•Using analytical formulation of trajectory sensitivity analysis....

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Bibliographic Details
Published in:Electric power systems research 2014-06, Vol.111, p.1-8
Main Authors: Nasri, Amin, Eriksson, Robert, Ghandhari, Mehrdad
Format: Article
Language:English
Subjects:
Applied sciences
Critical clearing time (CCT)
Disturbances. Regulation. Protection
Electrical engineering. Electrical power engineering
Electrical power engineering
Exact sciences and technology
Flexible AC transmission system (FACTS) devices
Miscellaneous
Power networks and lines
Small signal stability
Trajectory sensitivity analysis (TSA)
Transient stability
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Summary:•Suitable placement of series compensators using trajectory sensitivity analysis.•Improving both the transient and small signal stability of power system.•Demonstrating the situations where series compensation may worsen the stability.•Using analytical formulation of trajectory sensitivity analysis.•Reducing computational burden. This paper proposes an approach based on trajectory sensitivity analysis (TSA) to find most suitable placement of series compensators in the power system. The main objective is to maximize the benefit of these devices in order to enhance the rotor angle stability. This approach is formulated as a two-stage problem, whose first-stage describes prior to fault occurrence and whose second-stage represents the power system behavior involving a set of severe faults. The first-stage focuses on small signal stability, while the second-stage deals with transient stability of power system. In this vein, the trajectory sensitivities of the rotor angles of generators with respect to the reactances of transmission lines are calculated. Two equivalent rotor angles are introduced to find stability indices corresponding to the first- and the second-stage of the proposed approach. Numerical results from IEEE 10-machine 39-bus test system demonstrate the usefulness of the proposed method.
ISSN:0378-7796
1873-2046
1873-2046
DOI:10.1016/j.epsr.2014.01.022