Decentralized load frequency based on H control

Toshiyuki Ishii, Goro Shirai, Goro Fujita

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


This paper presents a decentralized load frequency control (LFC) based on H optimal control theory with an observer. A few LFC schemes have been proposed based on the optimal control theory, but they have not considered the change of system parameters in operation and the characteristics of load disturbances in a target system. In this paper, H robust control is introduced to address such problems. Owing to its practical merit, the proposed control scheme is a decentralized LFC. Employing observer theory, the proposed method requires only frequency and tie-line power deviation in each area. Numerical simulations are shown to demonstrate the effectiveness of the proposed method. H control was proven to show greater effectiveness of damping disturbance over the conventional optimal control by the design of control systems aimed at restricting the H norm of its transfer function. In particular, when a decentralized LFC is applied, by reducing the system size, H norm is easier to dampen; thus H control is more effective in the decentralized control. Future research topics include the design of H control system with a weight on frequency response.

Original languageEnglish
Pages (from-to)28-38
Number of pages11
JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
Issue number3
Publication statusPublished - 2001 Aug 1


  • Area control error
  • Automatic generation control
  • H control
  • Load frequency control

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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