Synchronverter-Enabled DC Power Sharing Approach for LVDC Microgrids

Saeed Peyghami, Pooya Davari, Hossein Mokhtari, Poh Chiang Loh, Frede Blaabjerg

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23 Citationer (Scopus)
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Resumé

In a classical ac Micro-Grid (MG), a common frequency exists for coordinating active power sharing among droop-controlled sources. Like the frequency droop method, a voltage based droop approach has been employed to control the converters in dc MGs. However, voltage variation due to the droop gains and line resistances causes poor power sharing and voltage regulation in dc MG, which in most cases are solved by a secondary controller using a communication network. To avoid such an infrastructure and its accompanied complications, this paper proposes a new droop scheme to control dc sources by introducing a small ac voltage superimposed onto the output dc voltage of converters. Therefore, dc sources can be coordinated together with the frequency of the ac voltage, without any communication network like Synchronous Generators (SGs) in conventional power systems. Small signal stability analysis as well as mathematical calculations are presented to demonstrate the analogy between the proposed strategy and frequency-based droop approach of the SGs. The effectiveness of the proposed control system is evaluated by simulations and verified by experiments.
OriginalsprogEngelsk
TidsskriftI E E E Transactions on Power Electronics
Vol/bind32
Udgave nummer10
Sider (fra-til)8089 - 8099
Antal sider11
ISSN0885-8993
DOI
StatusUdgivet - okt. 2017

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Electric potential
Synchronous generators
Telecommunication networks
Voltage control
Control systems
Controllers
Experiments

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title = "Synchronverter-Enabled DC Power Sharing Approach for LVDC Microgrids",
abstract = "In a classical ac Micro-Grid (MG), a common frequency exists for coordinating active power sharing among droop-controlled sources. Like the frequency droop method, a voltage based droop approach has been employed to control the converters in dc MGs. However, voltage variation due to the droop gains and line resistances causes poor power sharing and voltage regulation in dc MG, which in most cases are solved by a secondary controller using a communication network. To avoid such an infrastructure and its accompanied complications, this paper proposes a new droop scheme to control dc sources by introducing a small ac voltage superimposed onto the output dc voltage of converters. Therefore, dc sources can be coordinated together with the frequency of the ac voltage, without any communication network like Synchronous Generators (SGs) in conventional power systems. Small signal stability analysis as well as mathematical calculations are presented to demonstrate the analogy between the proposed strategy and frequency-based droop approach of the SGs. The effectiveness of the proposed control system is evaluated by simulations and verified by experiments.",
keywords = "DC microgrid (MG), Droop method, Power sharing, Synchronverter",
author = "Saeed Peyghami and Pooya Davari and Hossein Mokhtari and Loh, {Poh Chiang} and Frede Blaabjerg",
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Synchronverter-Enabled DC Power Sharing Approach for LVDC Microgrids. / Peyghami, Saeed; Davari, Pooya; Mokhtari, Hossein; Loh, Poh Chiang; Blaabjerg, Frede.

I: I E E E Transactions on Power Electronics, Bind 32, Nr. 10, 10.2017, s. 8089 - 8099.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Synchronverter-Enabled DC Power Sharing Approach for LVDC Microgrids

AU - Peyghami, Saeed

AU - Davari, Pooya

AU - Mokhtari, Hossein

AU - Loh, Poh Chiang

AU - Blaabjerg, Frede

PY - 2017/10

Y1 - 2017/10

N2 - In a classical ac Micro-Grid (MG), a common frequency exists for coordinating active power sharing among droop-controlled sources. Like the frequency droop method, a voltage based droop approach has been employed to control the converters in dc MGs. However, voltage variation due to the droop gains and line resistances causes poor power sharing and voltage regulation in dc MG, which in most cases are solved by a secondary controller using a communication network. To avoid such an infrastructure and its accompanied complications, this paper proposes a new droop scheme to control dc sources by introducing a small ac voltage superimposed onto the output dc voltage of converters. Therefore, dc sources can be coordinated together with the frequency of the ac voltage, without any communication network like Synchronous Generators (SGs) in conventional power systems. Small signal stability analysis as well as mathematical calculations are presented to demonstrate the analogy between the proposed strategy and frequency-based droop approach of the SGs. The effectiveness of the proposed control system is evaluated by simulations and verified by experiments.

AB - In a classical ac Micro-Grid (MG), a common frequency exists for coordinating active power sharing among droop-controlled sources. Like the frequency droop method, a voltage based droop approach has been employed to control the converters in dc MGs. However, voltage variation due to the droop gains and line resistances causes poor power sharing and voltage regulation in dc MG, which in most cases are solved by a secondary controller using a communication network. To avoid such an infrastructure and its accompanied complications, this paper proposes a new droop scheme to control dc sources by introducing a small ac voltage superimposed onto the output dc voltage of converters. Therefore, dc sources can be coordinated together with the frequency of the ac voltage, without any communication network like Synchronous Generators (SGs) in conventional power systems. Small signal stability analysis as well as mathematical calculations are presented to demonstrate the analogy between the proposed strategy and frequency-based droop approach of the SGs. The effectiveness of the proposed control system is evaluated by simulations and verified by experiments.

KW - DC microgrid (MG)

KW - Droop method

KW - Power sharing

KW - Synchronverter

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