Journal
IEEE TRANSACTIONS ON POWER SYSTEMS
Volume 33, Issue 5, Pages 5062-5071Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRS.2018.2816814
Keywords
Power system stability; load frequency control; time-varying delay; B-L inequality
Categories
Funding
- National Natural Science Foundation of China [61403311]
- Top International University Visiting Program for Outstanding Young Scholars of NPU
- Seed Foundation of Innovation and Creation for Graduate Students in Polytechnical University (NPU) [ZZ2018151]
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In this paper, a new method is put forward for the closed-loop stability analysis of PI-type load frequency control (LFC) scheme with interval time-varying delay. Improved delay-dependent conditions in terms of linear matrix inequalities for single-area and multi-area LFC systems are deduced by the proposed augmented Lyapunov-Krasovski (L-K) functional. Less conservativeness of our main results is due to an integral inequality called truncated second-order Bessel-Legendre (B-L) inequality, which can produce tighter bounds than Wirtinger-based inequality that encompasses Jensen inequality. Finally, the two-area interconnected power system based on Matlab/Simulink is provided to show the effectiveness and superiority of the obtained results.
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