Open AccessAn efficient power sharing approach in islanded hybrid AC / DC microgrid based on cooperative secondary control
Author(s) -
Nabian Dehaghani Mitra,
Taher Seyed Abbas,
Dehghani Arani Zahra
Publication year - 2021
Publication title -
international transactions on electrical energy systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 42
ISSN - 2050-7038
DOI - 10.1002/2050-7038.12897
Subject(s) - microgrid , voltage droop , converters , ac power , computer science , matlab , voltage , distributed generation , electronic engineering , renewable energy , control theory (sociology) , engineering , electrical engineering , voltage source , control (management) , artificial intelligence , operating system
Summary The increasing penetration of AC and DC loads and renewable energy resources as distributed generations (DGs) in electrical power grids, hybrid AC/DC microgrid concept has been taken into consideration as one of the future grid structures. In this article, an islanded hybrid AC/DC microgrid including AC and DC subgrids, which are connected to each other through bidirectional converters, is considered. Bidirectional interlinking converters in hybrid AC/DC microgrid have an important role in power sharing among AC and DC subgrids. Hence, coordinated power control schemes based on AC frequency, DC voltage and common bus voltage are used in the control system of these converters. On the other hand, the primary droop control method is implemented in AC and DC subgrids to share the power among DGs, which causes frequency and voltage deviations in AC subgrid and voltage drop in DC subgrid. In order to tackle these problems, secondary control methods based on distributed cooperative control are proposed in both AC and DC subgrids. By these secondary control methods, which use a communication graph among DGs, a complicated communication network and central controller are not required and the system reliability is increased. Therefore, the accurate voltage and frequency regulation and active and reactive power sharing in AC subgrid, as well as voltage regulation and proper current sharing in DC subgrid are obtained. The effectiveness of proposed secondary control methods for the hybrid AC/DC microgrid is validated in comparison with an available consensus control method by simulation results conducted in MATLAB/SIMULINK software.