Virtual Synchronous Machine/Dual-Droop Controller for Parallel Interlinking Converters in Hybrid AC–DC Microgrids

This paper addresses the operation of parallel interlinking converters (ICs) in hybrid AC–DC microgrids from different perspectives, then proposes a unified mitigation technique. Firstly, the influence of the system nonlinearity on circulating currents between parallel ICs is investigated. Secondly,...

Full description

Saved in:
Bibliographic Details
Published in:Arabian journal for science and engineering (2011) 2021-02, Vol.46 (2), p.983-1000
Main Authors: Alrajhi Alsiraji, Hasan, El-Shatshat, Ramadan
Format: Article
Language:English
Subjects:
Controllers
Diode rectifiers
Distributed generation
Electric converters
Engineering
Humanities and Social Sciences
multidisciplinary
Nonlinear analysis
Nonlinearity
Research Article-Electrical Engineering
Science
State space models
Switches
Synchronism
Synchronous machines
System dynamics
Time domain analysis
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper addresses the operation of parallel interlinking converters (ICs) in hybrid AC–DC microgrids from different perspectives, then proposes a unified mitigation technique. Firstly, the influence of the system nonlinearity on circulating currents between parallel ICs is investigated. Secondly, it is shown that ICs might induce voltage harmonics due to the antiparallel diodes of the power electronic switches which are seen by the AC subgrid as nonlinear diode rectifiers. Lastly, the synchronization of ICs following abnormal operating conditions is discussed and new findings are presented. In order to enhance the operation of ICs and overcome the preceding challenges, a modified virtual synchronous machine (VSM) strategy with a dual-droop (DD) controller is proposed. The positive influence of the proposed VSM-DD controller on the overall system dynamics is clearly justified. Small-signal state-space modeling for the entire system is conducted to verify the results analytically. A nonlinear time-domain simulation model is developed using PSCAD/EMTDC to validate the impact of the VSM-DD controller experimentally.
ISSN:2193-567X
1319-8025
2191-4281
DOI:10.1007/s13369-020-04794-y