Virtual Impedance-Based Droop Control Scheme to Avoid Power Quality and Stability Problems in VSI-Dominated Microgrids

Droop-based techniques have widely been utilized in controlling voltage source inverter based distributed generation units within a microgrid. Advantages of droop based control have been extensively discussed, while its effects on stability and power quality of the inverter based microgrids have not...

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Autores principales:	Babak Keyvani-Boroujeni, Bahador Fani, Ghazanfar Shahgholian, Hassan Haes Alhelou
Formato:	article
Lenguaje:	EN
Publicado:	IEEE 2021
Materias:	Droop control power quality stability microgrid Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/443fbf5d29ea491080f71d5ab829c289
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spelling	oai:doaj.org-article:443fbf5d29ea491080f71d5ab829c2892021-11-04T23:00:58ZVirtual Impedance-Based Droop Control Scheme to Avoid Power Quality and Stability Problems in VSI-Dominated Microgrids2169-353610.1109/ACCESS.2021.3122800https://doaj.org/article/443fbf5d29ea491080f71d5ab829c2892021-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/9585594/https://doaj.org/toc/2169-3536Droop-based techniques have widely been utilized in controlling voltage source inverter based distributed generation units within a microgrid. Advantages of droop based control have been extensively discussed, while its effects on stability and power quality of the inverter based microgrids have not been explicitly studied. This paper addresses this gap by analyzing the stability of islanded microgrid with focusing on power quality problems. From this viewpoint, current paper studies the effect of parameters change on the stability margin of the microgrid using a bifurcation analysis approach. To this end, this work firstly derives a dynamic model of a microgrid including controllers of the inverter, network and loads. Based on this model, the loci of the system eigenvalues have been analyzed, showing that, by changing the droop coefficients, the hopf and period doubling bifurcation can occur in such a system. Furthermore, the droop tuning procedure may also cause the system to experience the flicker phenomenon in advance of the instability. Next, a virtual impedance-based solution is presented to avoid the flicker as well as instability problems. Finally, the efficacy of the proposed method is proved on a practical network.Babak Keyvani-BoroujeniBahador FaniGhazanfar ShahgholianHassan Haes AlhelouIEEEarticleDroop controlpower qualitystabilitymicrogridElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENIEEE Access, Vol 9, Pp 144999-145011 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Droop control power quality stability microgrid Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	Droop control power quality stability microgrid Electrical engineering. Electronics. Nuclear engineering TK1-9971 Babak Keyvani-Boroujeni Bahador Fani Ghazanfar Shahgholian Hassan Haes Alhelou Virtual Impedance-Based Droop Control Scheme to Avoid Power Quality and Stability Problems in VSI-Dominated Microgrids
description	Droop-based techniques have widely been utilized in controlling voltage source inverter based distributed generation units within a microgrid. Advantages of droop based control have been extensively discussed, while its effects on stability and power quality of the inverter based microgrids have not been explicitly studied. This paper addresses this gap by analyzing the stability of islanded microgrid with focusing on power quality problems. From this viewpoint, current paper studies the effect of parameters change on the stability margin of the microgrid using a bifurcation analysis approach. To this end, this work firstly derives a dynamic model of a microgrid including controllers of the inverter, network and loads. Based on this model, the loci of the system eigenvalues have been analyzed, showing that, by changing the droop coefficients, the hopf and period doubling bifurcation can occur in such a system. Furthermore, the droop tuning procedure may also cause the system to experience the flicker phenomenon in advance of the instability. Next, a virtual impedance-based solution is presented to avoid the flicker as well as instability problems. Finally, the efficacy of the proposed method is proved on a practical network.
format	article
author	Babak Keyvani-Boroujeni Bahador Fani Ghazanfar Shahgholian Hassan Haes Alhelou
author_facet	Babak Keyvani-Boroujeni Bahador Fani Ghazanfar Shahgholian Hassan Haes Alhelou
author_sort	Babak Keyvani-Boroujeni
title	Virtual Impedance-Based Droop Control Scheme to Avoid Power Quality and Stability Problems in VSI-Dominated Microgrids
title_short	Virtual Impedance-Based Droop Control Scheme to Avoid Power Quality and Stability Problems in VSI-Dominated Microgrids
title_full	Virtual Impedance-Based Droop Control Scheme to Avoid Power Quality and Stability Problems in VSI-Dominated Microgrids
title_fullStr	Virtual Impedance-Based Droop Control Scheme to Avoid Power Quality and Stability Problems in VSI-Dominated Microgrids
title_full_unstemmed	Virtual Impedance-Based Droop Control Scheme to Avoid Power Quality and Stability Problems in VSI-Dominated Microgrids
title_sort	virtual impedance-based droop control scheme to avoid power quality and stability problems in vsi-dominated microgrids
publisher	IEEE
publishDate	2021
url	https://doaj.org/article/443fbf5d29ea491080f71d5ab829c289
work_keys_str_mv	AT babakkeyvaniboroujeni virtualimpedancebaseddroopcontrolschemetoavoidpowerqualityandstabilityproblemsinvsidominatedmicrogrids AT bahadorfani virtualimpedancebaseddroopcontrolschemetoavoidpowerqualityandstabilityproblemsinvsidominatedmicrogrids AT ghazanfarshahgholian virtualimpedancebaseddroopcontrolschemetoavoidpowerqualityandstabilityproblemsinvsidominatedmicrogrids AT hassanhaesalhelou virtualimpedancebaseddroopcontrolschemetoavoidpowerqualityandstabilityproblemsinvsidominatedmicrogrids
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Virtual Impedance-Based Droop Control Scheme to Avoid Power Quality and Stability Problems in VSI-Dominated Microgrids

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