Improved droop control with DC grid resonance damping capability

Agustí Egea-Àlvarez, Sajjad Fekriasl, Eduardo Prieto-Araujo

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Abstract

The concept of the so-called droop control has been widely discussed in the literature as the preferred controller for Voltage Source Converter for High Voltage Direct Current (VSC-HVDC) multiterminal and DC grid schemes. Droop control provides fast dynamic response and power-sharing between converter stations among other advantages but, as the controller is usually implemented as a merely proportional gain, the DC grid resonances damping is often very poor. This is because although the grids under study are DC, a broad range of high-frequency components and transient dynamics are inevitable in DC grids caused by long cables and switching to name a few. Conventional droops based on proportional gain are not able to handle such frequency-dependant issues of the DC grids. To improve the DC dynamic response, this paper presents a new droop controller where a DC resonance mitigation compensator is augmented to the conventional droop control that will result in an improved droop compensation by guaranteeing that power-sharing task will satisfactorily meet the desired damping requirements.
Original languageEnglish
Title of host publication15th IET International Conference on AC and DC Power Transmission (ACDC 2019)
Place of Publication[Stevenage]
Number of pages6
Volume2019
EditionCP751
ISBN (Electronic)978-1-83953-007-4
DOIs
Publication statusPublished - 6 Feb 2019
Event15th IET International Conference on AC and DC Power Transmission, ACDC 2019 - Coventry, United Kingdom
Duration: 5 Feb 20197 Feb 2019

Conference

Conference15th IET International Conference on AC and DC Power Transmission, ACDC 2019
CountryUnited Kingdom
CityCoventry
Period5/02/197/02/19

Keywords

  • dynamic response
  • power conversion
  • power distribution control
  • power grids
  • damping
  • HVDC power convertors
  • voltage control
  • power generation control
  • HVDC power transmission
  • distributed power generation

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    Egea-Àlvarez, A., Fekriasl, S., & Prieto-Araujo, E. (2019). Improved droop control with DC grid resonance damping capability. In 15th IET International Conference on AC and DC Power Transmission (ACDC 2019) (CP751 ed., Vol. 2019). [Stevenage]. https://doi.org/10.1049/cp.2019.0015