An optimized input/output-constrained control design with application to microgrid operation

Roland Harvey, Zhihua Qu, Toru Namerikawa

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In this letter, a nonlinear control design is presented for systems whose input and output vectors are saturated. The proposed synthesis includes an optimal tracker as the seed controller and explicitly imposes all the relevant constraints on system input, on the rate of change in the input, and on system output by using the tools of barrier functions, input-output feedback linearization, comparison argument, Lyapunov argument, and a real-Time constrained optimization. The proposed design is applied to microgrid operation with high penetration of renewable generation, where net load and variable generation must be balanced and the microgrid should be operated at an optimal or near-optimal performance level. Since traditional generation has a limited ramping rate, battery storage devices, and demand responses become necessary to effectively deal with variability of renewable generation and to maintain frequency stability, but their capacities are also limited. It is shown that the proposed design is effective for coordinated control of traditional generation, storage and demand response so that the power system frequency is guaranteed to be within the required operational limits and that renewable curtailment is eliminated or minimized.

Original languageEnglish
Article number8764493
Pages (from-to)367-372
Number of pages6
JournalIEEE Control Systems Letters
Issue number2
Publication statusPublished - 2020 Apr


  • Constrained control
  • optimal control
  • power systems

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Control and Optimization


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