Open AccessImproved power decoupling control strategy based on virtual synchronous generator
Author(s) -
Li Bin,
Zhou Lin,
Yu Xirui,
Zheng Chen,
Liu Jinhong
Publication year - 2017
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2016.0608
Subject(s) - decoupling (probability) , control theory (sociology) , ac power , voltage droop , microgrid , inertia , voltage , computer science , maximum power point tracking , power control , power (physics) , engineering , control engineering , inverter , control (management) , voltage source , electrical engineering , physics , classical mechanics , artificial intelligence , quantum mechanics
Virtual synchronous generator (VSG) control scheme, which can be regarded as an extension of droop control, has received much attention from researchers as the introduction of rotational inertia to inverters. This study discusses an active and reactive power decoupling technique for VSGs in microgrid, as an important aspect of VSG. The traditional power decoupling mechanism is initially analysed. Subsequently, the properties of the line impedance at different voltage degrees are compared. Results indicate that the traditional power decoupling method is unsuitable for medium‐ and low‐voltage microgrids. Thus, an improved power decoupling method is proposed. By estimating the voltage at the point of common coupling and tracking their reference values, the output active and reactive power of inverters can perform dynamic decoupling. Furthermore, the stability of the new control structure and selection of relevant coefficients are analysed. The simulation and experimental results verify the enhanced decoupling strategy for VSGs.