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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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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