Towards Optimal Coordination between Regional Groups: HVDC Supplementary Power Control

Andrea Tosatto, Georgios Misyris, Adria Junyent-Ferre, Fei Teng, Spyros Chatzivasileiadis

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Abstract

With Europe dedicated to limiting climate change and greenhouse gas emissions, large shares of Renewable Energy Sources (RES) are being integrated in the national grids, phasing out conventional generation. The new challenges arising from the energy transition will require a better coordination between neighboring system operators to maintain system security. To this end, this paper studies the benefit of exchanging primary frequency reserves between asynchronous areas using the Supplementary Power Control (SPC) functionality of High-Voltage Direct-Current (HVDC) lines. First, we focus on the derivation of frequency metrics for asynchronous AC systems coupled by HVDC interconnectors. We compare two different control schemes for HVDC converters, which allow for unilateral or bilateral exchanges of reserves between neighboring systems. Second, we formulate frequency constraints and include them in a unit commitment problem to ensure the N-1 security criterion. A data-driven approach is proposed to better represent the frequency nadir constraint by means of cutting hyperplanes. Our results suggest that the exchange of primary reserves through HVDC can reduce up to 10% the cost of reserve procurement while maintaining the system N-1 secure.

Original languageEnglish
JournalIEEE Transactions on Power Systems
Number of pages12
ISSN0885-8950
DOIs
Publication statusAccepted/In press - 2021

Bibliographical note

Publisher Copyright:
IEEE

Keywords

  • Asynchronous areas
  • Droop frequency control
  • Frequency balancing
  • Frequency control
  • Frequency conversion
  • Frequency measurement
  • Generators
  • HVDC transmission
  • Indexes
  • Measurement
  • optimization
  • Supplementary Power Control
  • unit commitment

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