Open AccessInteraction between the voltage‐droop and the frequency‐droop control for multi‐terminal HVDC systems
Author(s) -
Akkari Samy,
Dai Jing,
Petit Marc,
Guillaud Xavier
Publication year - 2016
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2015.0814
Subject(s) - voltage droop , control theory (sociology) , controller (irrigation) , automatic frequency control , converters , transient (computer programming) , terminal (telecommunication) , voltage , coupling (piping) , grid , computer science , reliability (semiconductor) , voltage controller , engineering , electronic engineering , control (management) , voltage source , electrical engineering , power (physics) , physics , mathematics , telecommunications , mechanical engineering , agronomy , geometry , artificial intelligence , biology , operating system , quantum mechanics
Multi‐terminal DC systems must provide a high level of reliability and may have to support the interconnected AC grids. This can be achieved by providing AC/DC converters with a dual controller combining both the voltage‐droop and the frequency‐droop control techniques. In this article, the coupling between those droops is theoretically investigated and quantified, and a proposed corrected value of the frequency‐droop parameter allows the system to comply with the TSO's requirements with regards to the frequency support of the AC grids despite the unintended interaction of the two droops. A dynamic frequency‐droop parameter is then proposed to also cope with the controller limits. Finally, an electromagnetic transient study of a five‐terminal HVDC grid is performed to validate the theoretical results.