Review of Active and Reactive Power Sharing Strategies in Hierarchical Controlled Microgrids

Yang Han, Hong Li, Pan Shen, Ernane A. A. Coelho, Josep M. Guerrero

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140 Citationer (Scopus)
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Resumé

Microgrids consist of multiple parallel-connected distributed generation (DG) units with coordinated control strategies, which are able to operate in both grid-connected and islanded mode. Microgrids are attracting more and more attention since they can alleviate the stress of main transmission systems, reduce feeder losses, and improve system power quality. When the islanded microgrids are concerned, it is important to maintain system stability and achieve load power sharing among the multiple parallel-connected DG units. However, the poor active and reactive power sharing problems due to the influence of impedance mismatch of the DG feeders and the different ratings of the DG units are inevitable when the conventional droop control scheme is adopted. Therefore, the adaptive/improved droop control, network-based control methods and cost-based droop schemes are compared and summarized in this paper for active power sharing. Moreover, nonlinear and unbalanced loads could further affect the reactive power sharing when regulating the active power, and it is difficult to share the reactive power accurately only by using the enhanced virtual impedance method. Therefore, the hierarchical control strategies are utilized as supplements of the conventional droop controls and virtual impedance methods. The improved hierarchical control approaches such as the algorithms based on graph theory, multi-agent system, the gain scheduling method and predictive control have been proposed to achieve proper reactive power sharing for islanded microgrids and eliminate the effect of the communication delays on hierarchical control. Finally, the future research trends on islanded microgrids are also discussed in this paper.
OriginalsprogEngelsk
TidsskriftI E E E Transactions on Power Electronics
Vol/bind32
Udgave nummer3
Sider (fra-til)2427 - 2451
Antal sider25
ISSN0885-8993
DOI
StatusUdgivet - mar. 2017

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Reactive power
Distributed power generation
Graph theory
Power quality
Multi agent systems
System stability
Scheduling
Communication

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Han, Yang ; Li, Hong ; Shen, Pan ; Coelho, Ernane A. A. ; Guerrero, Josep M. / Review of Active and Reactive Power Sharing Strategies in Hierarchical Controlled Microgrids. I: I E E E Transactions on Power Electronics. 2017 ; Bind 32, Nr. 3. s. 2427 - 2451.
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title = "Review of Active and Reactive Power Sharing Strategies in Hierarchical Controlled Microgrids",
abstract = "Microgrids consist of multiple parallel-connected distributed generation (DG) units with coordinated control strategies, which are able to operate in both grid-connected and islanded mode. Microgrids are attracting more and more attention since they can alleviate the stress of main transmission systems, reduce feeder losses, and improve system power quality. When the islanded microgrids are concerned, it is important to maintain system stability and achieve load power sharing among the multiple parallel-connected DG units. However, the poor active and reactive power sharing problems due to the influence of impedance mismatch of the DG feeders and the different ratings of the DG units are inevitable when the conventional droop control scheme is adopted. Therefore, the adaptive/improved droop control, network-based control methods and cost-based droop schemes are compared and summarized in this paper for active power sharing. Moreover, nonlinear and unbalanced loads could further affect the reactive power sharing when regulating the active power, and it is difficult to share the reactive power accurately only by using the enhanced virtual impedance method. Therefore, the hierarchical control strategies are utilized as supplements of the conventional droop controls and virtual impedance methods. The improved hierarchical control approaches such as the algorithms based on graph theory, multi-agent system, the gain scheduling method and predictive control have been proposed to achieve proper reactive power sharing for islanded microgrids and eliminate the effect of the communication delays on hierarchical control. Finally, the future research trends on islanded microgrids are also discussed in this paper.",
keywords = "Active power sharing, Communication delay, Nonlinear and unbalanced loads, Droop control, Hierarchical control, Consensus control, Graph theory, Microgrids , Reactive power sharing",
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Review of Active and Reactive Power Sharing Strategies in Hierarchical Controlled Microgrids. / Han, Yang; Li, Hong; Shen, Pan; Coelho, Ernane A. A.; Guerrero, Josep M.

I: I E E E Transactions on Power Electronics, Bind 32, Nr. 3, 03.2017, s. 2427 - 2451.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Review of Active and Reactive Power Sharing Strategies in Hierarchical Controlled Microgrids

AU - Han, Yang

AU - Li, Hong

AU - Shen, Pan

AU - Coelho, Ernane A. A.

AU - Guerrero, Josep M.

PY - 2017/3

Y1 - 2017/3

N2 - Microgrids consist of multiple parallel-connected distributed generation (DG) units with coordinated control strategies, which are able to operate in both grid-connected and islanded mode. Microgrids are attracting more and more attention since they can alleviate the stress of main transmission systems, reduce feeder losses, and improve system power quality. When the islanded microgrids are concerned, it is important to maintain system stability and achieve load power sharing among the multiple parallel-connected DG units. However, the poor active and reactive power sharing problems due to the influence of impedance mismatch of the DG feeders and the different ratings of the DG units are inevitable when the conventional droop control scheme is adopted. Therefore, the adaptive/improved droop control, network-based control methods and cost-based droop schemes are compared and summarized in this paper for active power sharing. Moreover, nonlinear and unbalanced loads could further affect the reactive power sharing when regulating the active power, and it is difficult to share the reactive power accurately only by using the enhanced virtual impedance method. Therefore, the hierarchical control strategies are utilized as supplements of the conventional droop controls and virtual impedance methods. The improved hierarchical control approaches such as the algorithms based on graph theory, multi-agent system, the gain scheduling method and predictive control have been proposed to achieve proper reactive power sharing for islanded microgrids and eliminate the effect of the communication delays on hierarchical control. Finally, the future research trends on islanded microgrids are also discussed in this paper.

AB - Microgrids consist of multiple parallel-connected distributed generation (DG) units with coordinated control strategies, which are able to operate in both grid-connected and islanded mode. Microgrids are attracting more and more attention since they can alleviate the stress of main transmission systems, reduce feeder losses, and improve system power quality. When the islanded microgrids are concerned, it is important to maintain system stability and achieve load power sharing among the multiple parallel-connected DG units. However, the poor active and reactive power sharing problems due to the influence of impedance mismatch of the DG feeders and the different ratings of the DG units are inevitable when the conventional droop control scheme is adopted. Therefore, the adaptive/improved droop control, network-based control methods and cost-based droop schemes are compared and summarized in this paper for active power sharing. Moreover, nonlinear and unbalanced loads could further affect the reactive power sharing when regulating the active power, and it is difficult to share the reactive power accurately only by using the enhanced virtual impedance method. Therefore, the hierarchical control strategies are utilized as supplements of the conventional droop controls and virtual impedance methods. The improved hierarchical control approaches such as the algorithms based on graph theory, multi-agent system, the gain scheduling method and predictive control have been proposed to achieve proper reactive power sharing for islanded microgrids and eliminate the effect of the communication delays on hierarchical control. Finally, the future research trends on islanded microgrids are also discussed in this paper.

KW - Active power sharing

KW - Communication delay

KW - Nonlinear and unbalanced loads

KW - Droop control

KW - Hierarchical control

KW - Consensus control

KW - Graph theory

KW - Microgrids

KW - Reactive power sharing

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DO - 10.1109/TPEL.2016.2569597

M3 - Journal article

VL - 32

SP - 2427

EP - 2451

JO - I E E E Transactions on Power Electronics

JF - I E E E Transactions on Power Electronics

SN - 0885-8993

IS - 3

ER -