Robust decentralized control for multimachine power systems

Youyi Wang, David J. Hill, Guoxiao Guo

Research output: Contribution to journalArticleResearchpeer-review

64 Citations (Scopus)


In this paper, a new robust linear decentralized controller is proposed to enhance the transient stability of nonlinear niultiniachine power systems. Only local measurements are required in the proposed controller. The feedback gain of each generator is obtained by solving an algebraic Riccati equation based on the bounds of the machine parameters. The stability analysis shows that the decentralized controller can guarantee the system stability over the whole operating region and regardless of fault locations or parameter uncertainties of the transmission network. Compared with nonlinear controllers, linear controllers are of simpler structure and easier to be implemented. A threemachine power system is considered as an application example. Simulation results show that despite the interconnections between different generators, nonlinearities in the system, different operating points, and different fault locations, the proposed robust decentralized controller can greatly enhance power system transient stability.

Original languageEnglish
Pages (from-to)271-279
Number of pages9
JournalIEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications
Issue number3
Publication statusPublished - 1998
Externally publishedYes


  • Feedback linearization
  • Nonlinear systems
  • Power system control
  • Robust control
  • Stability enhancement

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