Design of Robust Load Frequency Controller using Mixed Sensitivity based $H_{\infty}$ norm

혼합강도 $H_{\infty}$ 제어기법을 이용한 강인한 부하주파수 제어기 설계

  • 정형환 (동아대학교 대학원 전기공학과) ;
  • 김상효 (동아대학교 대학원 전기공학과) ;
  • 이정필 (동아대학교 대학원 전기공학과) ;
  • 한길만 (동아대학교 대학원 전기공학과)
  • Published : 2000.05.01

Abstract

In this paper, a robust controller using $H_{\infty}$ control theory has been designed for the load frequency control of interconnected 2-area power system. The main advantage of the proposed $H_{\infty}$ controller is that uncertainties of power system can be included at the stage of controller design. Representation of uncertainties is modeled by multiplicative uncertainly. In the mixed sensitivity problems, disturbance attenuation and uncertainty of the system is treated simultaneously. The robust stability and the performance of model uncertainties are represented by frequency weighted transfer function. The design of load frequency controller for each area was based on state-space approach. The comparative computer simulation results for the proposed controller and the conventional techniques such as the optimal control and the PID one were analyzed at the additions of various disturbances. Their deviation magnitude of frequency and tie line power flow at each area were mainly evaluated. Also the testing results of robustness for the cases that the perturbations of the all parameters of power system were amounted to about 20% were introduced. It was approved that the resultant performances of the proposed $H_{\infty}$ controller with mixed sensitivity were more robust and stable than the one of conventional controllers.

Keywords

References

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