Coordinated Control of Multiterminal DC Grid Power Injections for Improved Rotor-Angle Stability Based on Lyapunov Theory

Robert Eriksson

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The stability of an interconnected ac/dc system is affected by disturbances occurring in the system. Disturbances, such as three-phase faults, may jeopardize the rotor-angle stability and, thus, the generators fall out of synchronism. The possibility of fast change of the injected powers by the multiterminal dc grid can, by proper control action, enhance this stability. This paper proposes a new time optimal control strategy for the injected power of multiterminal dc grids to enhance the rotor-angle stability. The controller is time optimal, since it reduces the impact of a disturbance as fast as possible, and is based on Lyapunov theory considering the nonlinear behavior. The time optimal controller is of a bang-bang type and uses wide-area measurements as feedback signals. Nonlinear simulations are run in the Nordic32 test system implemented in PowerFactory/DIgSILENT with an interface to Matlab where the controller is implemented.
Original languageEnglish
JournalI E E E Transactions on Power Delivery
Volume29
Issue number4
Pages (from-to)1789-1797
Number of pages9
ISSN0885-8977
DOIs
Publication statusPublished - 2014

Keywords

  • Control Lyapunov function
  • Coordinated control
  • Energy function
  • high-voltage direct current (HVDC)
  • Multiterminal dc (MTDC)
  • Small-signal stability
  • Transient stability

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