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Keywords
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Electric vehicle Aggregator, LMI, Lyapunov Krasovskii theory, Load frequency control, Stability analysis, Time varying delay.
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Abstract
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In the integrated electrical systems, frequency control service considering the electric vehicle (EV) aggregators could lead to time varying delay in load frequency control (LFC) schemes. These delays influence the LFC system efficiency, and in some situations, the lack of a clear choice of a control strategy considering the time varying delays causes power system instability. Thus, this paper illustrates different time varying delays based on the stability of an LFC system in the EV aggregators presence. The LFC's delay dependent stability study is executed for finding the stability region and, stability criteria is suggested using the linear matrix inequality (LMI) method and Lyapunov
Krasovskii theory. Also, Wirtinger based improved inequality and bounding lemma are applied to compute the greatest allowable delay in the LFC system, including the EV aggregators.
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