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Due to the increasingly marketized demands of power systems, the dedicated communication channel used by the traditional load frequency control (LFC) scheme is ineluctably replaced by highly open communication networks, which may introduce constant, and time-varying delays. Hereupon, for those two kinds of communication methods, this article explores the LFC problem of power systems in consideration of constant, and time-varying delays. By utilizing the Lyapunov stability theory, and an improved inequality technique, some criteria for guaranteeing the stability, and the specified H<sub>&#x221E;</sub> performance of the closed-loop system are obtained, and a PID-type controller with the consideration of time delays and disturbance is designed. The case studies take one-area delayed LFC scheme and the traditional/deregulated three-area LFC scheme as examples to discuss the relationships between the maximum allowable delay, and the controller gain as well as the relationships between time delays, and the minimum H<sub>&#x221E;</sub> performance index, respectively. Finally, the effectiveness of the method proposed is verified, and the comparison results show certain advantages of the method presented in this article over the existing literature.

ieee systems journal

An Improved Result on <inline-formula><tex-math notation="LaTeX">$H_{\infty }$</tex-math></inline-formula> Load Frequency Control for Power Systems With Time Delays

An Improved Result on $H_{\infty }$ Load Frequency Control for Power Systems With Time Delays