Robust analysis and design of power system load frequency control using the Kharitonov's theorem

Toulabi, M. R ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijepes.2013.08.014
  3. Abstract:
  4. This paper presents a robust decentralized proportional-integral (PI) control design as a solution of the load frequency control (LFC) in a multi-area power system. In the proposed methodology, the system robustness margin and transient performance are optimized simultaneously to achieve the optimum PI controller parameters. The Kharitonov's theorem is used to determine the robustness margin, i.e., the maximal uncertainty bounds under which the stable performance of the power system is guaranteed. The integral time square error (ITSE) is applied to quantify the transient performance of the LFC system. In order to tune the PI gains, the control objective function is optimized using the genetic algorithm (GA). To validate the effectiveness of the proposed approach, some time based simulations are performed on a three-area power system and the results are then compared with an optimal PI controller. The comparisons show that the proposed control strategy provides the satisfactory robust performance for the wide range of system parameters and load changes in the presence of system nonlinearities and is superior to the other methods
  5. Keywords:
  6. Genetic algorithm (GA) ; Load frequency control (LFC) ; Robust control ; Tsypkin-Polyak function ; Zero exclusion condition Robustness margin ; Load-frequency control ; Multi area power systems ; PI controller parameters ; Power system load frequencies ; Proportional-integral control ; Robustness margins ; System nonlinearities ; Transient performance ; Control nonlinearities ; Controllers ; Electric control equipment ; Electric frequency control ; Genetic algorithms ; Optimization ; Press load control ; Robustness (control systems) ; Electric load management
  7. Source: International Journal of Electrical Power and Energy Systems ; Vol. 55, issue , 2014 , p. 51-58
  8. URL: http://www.sciencedirect.com/science/article/pii/S0142061513003554