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RRTBased Computation for Dynamic Security Analysis of Power Systems
Qiang WU Yoshihiko SUSUKI T. John KOO
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E99A
No.2
pp.491501 Publication Date: 2016/02/01 Online ISSN: 17451337
DOI: 10.1587/transfun.E99.A.491 Type of Manuscript: Special Section PAPER (Special Section on Mathematical Systems Science and its Applications) Category: Keyword: power system, security, hybrid automaton, reachability, RRT,
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Summary:
Analysis of security governed by dynamics of power systems, which we refer to as dynamic security analysis, is a primary but challenging task because of its hybrid nature, that is, nonlinear continuoustime dynamics integrated with discrete switchings. In this paper, we formulate this analysis problem as checking the reachability of a mathematical model representing dynamic performances of a target power system. We then propose a computational approach to the analysis based on the socalled RRT (Rapidlyexploring Random Tree) algorithm. This algorithm searches for a feasible trajectory connecting an initial state possibly at a lower security level and a target set with a desirable higher security level. One advantage of the proposed approach is that it derives a concrete control strategy to guarantee the desirable security level if the feasible trajectory is found. The performance and effectiveness of the proposed approach are demonstrated by applying it to two running examples on power system studies: single machineinfinite system and twoarea system for frequency control problem.

