Influence of Active Power Gradient Control of an MMC-HVDC Link on Long-Term Frequency Stability

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This paper presents a frequency stability analysis of two power systems coupled by a high-voltage direct current (HVDC) system, based on modular multilevel converter (MMC) technology. The effect of the active power gradient (APG) control scheme attached to MMC on the long-term frequency response (time frame of 1 s to 2 min) of the AC synchronous areas is analyzed by considering a typical disturbance like a load shedding, which helps in clearly observing the frequency deviation produced in the power systems considered. The frequency
responses are assessed through deterministic software experiments in the time domain, focusing on 1) power systems with similar and different inertias and 2) the effect of varying the APG of the MMC-HVDC system. The simulation results reveal a correlation between APG and the long term frequency response, which becomes more prominent for low-inertia systems.
Original languageEnglish
Title of host publicationProceedings of the 2017 IEEE PES General Meeting
Place of PublicationPiscataway, NJ
Number of pages5
ISBN (Electronic)978-1-5386-2212-4
Publication statusPublished - Jul 2017
Event2017 IEEE PES General Meeting: Energizing a More Secure, Resilent, and Adaptable Grid - Chicago, IL, United States
Duration: 16 Jul 201720 Jul 2017


Conference2017 IEEE PES General Meeting
CountryUnited States
CityChicago, IL
Internet address


  • High-voltage direct current (HVDC)
  • modular multilevel converter (MMC))
  • active power gradient (APG)
  • long-term frequency stability

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