Cooperative frequency control with a multi-terminal high-voltage DC network

  • Authors:

  • Alain Sarlette;Jing Dai;Yannick Phulpin;Damien Ernst

  • Affiliations:

  • SYSTeMS, Ghent University, Technologiepark Zwijnaarde 914, 9052 Zwijnaarde, Belgium;Department of Power and Energy Systems, SUPELEC, 3 rue Joliot Curie, 91192 Gif-sur-Yvette, France;INESC Porto, FEUP campus, Rua Dr.Roberto Frias 378, 4200 - 465 Porto, Portugal;Department of Electrical Engineering and Computer Science, University of Liège, B-4000 Liège, Belgium

  • Venue:
  • Automatica (Journal of IFAC)
  • Year:
  • 2012

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Abstract

We consider frequency control in power systems made of several non-synchronous AC areas connected by a multi-terminal high-voltage direct current (HVDC) grid. We propose two HVDC control schemes to make the areas collectively react to power imbalances, so that individual areas can schedule smaller power reserves. The first scheme modifies the power injected by each area into the DC grid as a function of frequency deviations of neighboring AC areas. The second scheme changes the DC voltage of each converter as a function of its own area's frequency only, relying on the physical network to obtain a collective reaction. For both schemes, we prove convergence of the closed-loop system with heterogeneous AC areas.