A new unified control strategy for inverter-based micro-grid using hybrid droop scheme

Micro-grid (MG) operation using voltage control methods (VCMs) has been widely recommended for parallel operation of three phase voltage source inverters, especially during islanded mode to maintain the voltage level in the MG. In contrast, this paper presents a new unified control strategy for MG p...

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Main Authors: M.A. Aboushal, Mohamed M. Zakaria Moustafa
Format: Article
Language:English
Published: Elsevier 2019-12-01
Series:Alexandria Engineering Journal
Online Access:http://www.sciencedirect.com/science/article/pii/S1110016819301097
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spelling doaj-b8be13c662c848a48a4d67e1a3a194a12021-06-02T16:56:56ZengElsevierAlexandria Engineering Journal1110-01682019-12-0158412291245A new unified control strategy for inverter-based micro-grid using hybrid droop schemeM.A. Aboushal0Mohamed M. Zakaria Moustafa1Middle East Oil Refinery Co., Department of Electrical and Automation, Amreya Free zone, Alexandria 23511, Egypt; Corresponding author at: In front of 52, Al Sag Mohamed Abdel-Salam St., Alexandria, Egypt.Alexandria University, Department of Electrical Engineering, Lotfy El-Sied st., Alexandria 21526, EgyptMicro-grid (MG) operation using voltage control methods (VCMs) has been widely recommended for parallel operation of three phase voltage source inverters, especially during islanded mode to maintain the voltage level in the MG. In contrast, this paper presents a new unified control strategy for MG parallel operation using a current control method (CCM). A hybrid control scheme which combines a universal robust droop controller (URDC) and quasi-proportional resonant (QPR) regulator is introduced. It ensures equal power sharing among parallel operated inverters during all MG's operating modes. Moreover, an improved adaptive estimator for the reference current magnitude is integrated to meet dynamic load variations. Furthermore, the scheme is enhanced with a self-synchronized capability using a simple synchronous reference frame phase locked loop (SRF-PLL). This obviates the necessity of communication links and external synchronous clocks required for synchronization process. In addition, a decentralized control action is locally managed to restore the inverter's frequency upon any reactive load change. Modeling and simulation results using MATLAB/SIMULINK software are presented to show the effectiveness of the proposed strategy. Keywords: Universal current droop, Robust droop control, Proportional resonant controller, Parallel inverters, Unified control, Micro-grid, Smart gridshttp://www.sciencedirect.com/science/article/pii/S1110016819301097
collection DOAJ
language English
format Article
sources DOAJ
author M.A. Aboushal
Mohamed M. Zakaria Moustafa
spellingShingle M.A. Aboushal
Mohamed M. Zakaria Moustafa
A new unified control strategy for inverter-based micro-grid using hybrid droop scheme
Alexandria Engineering Journal
author_facet M.A. Aboushal
Mohamed M. Zakaria Moustafa
author_sort M.A. Aboushal
title A new unified control strategy for inverter-based micro-grid using hybrid droop scheme
title_short A new unified control strategy for inverter-based micro-grid using hybrid droop scheme
title_full A new unified control strategy for inverter-based micro-grid using hybrid droop scheme
title_fullStr A new unified control strategy for inverter-based micro-grid using hybrid droop scheme
title_full_unstemmed A new unified control strategy for inverter-based micro-grid using hybrid droop scheme
title_sort new unified control strategy for inverter-based micro-grid using hybrid droop scheme
publisher Elsevier
series Alexandria Engineering Journal
issn 1110-0168
publishDate 2019-12-01
description Micro-grid (MG) operation using voltage control methods (VCMs) has been widely recommended for parallel operation of three phase voltage source inverters, especially during islanded mode to maintain the voltage level in the MG. In contrast, this paper presents a new unified control strategy for MG parallel operation using a current control method (CCM). A hybrid control scheme which combines a universal robust droop controller (URDC) and quasi-proportional resonant (QPR) regulator is introduced. It ensures equal power sharing among parallel operated inverters during all MG's operating modes. Moreover, an improved adaptive estimator for the reference current magnitude is integrated to meet dynamic load variations. Furthermore, the scheme is enhanced with a self-synchronized capability using a simple synchronous reference frame phase locked loop (SRF-PLL). This obviates the necessity of communication links and external synchronous clocks required for synchronization process. In addition, a decentralized control action is locally managed to restore the inverter's frequency upon any reactive load change. Modeling and simulation results using MATLAB/SIMULINK software are presented to show the effectiveness of the proposed strategy. Keywords: Universal current droop, Robust droop control, Proportional resonant controller, Parallel inverters, Unified control, Micro-grid, Smart grids
url http://www.sciencedirect.com/science/article/pii/S1110016819301097
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