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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.
Originalsprog | Engelsk |
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Tidsskrift | I E E E Transactions on Power Electronics |
Vol/bind | 32 |
Udgave nummer | 10 |
Sider (fra-til) | 8089 - 8099 |
Antal sider | 11 |
ISSN | 0885-8993 |
DOI | |
Status | Udgivet - okt. 2017 |
Fingeraftryk
Dyk ned i forskningsemnerne om 'Synchronverter-Enabled DC Power Sharing Approach for LVDC Microgrids'. Sammen danner de et unikt fingeraftryk.Projekter
- 2 Afsluttet
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Multi-Physics of High Power Density Power Electronic Systems
DFF-Individuelle postdocstipendier : DFF-1333-00034
01/03/2016 → 31/05/2018
Projekter: Projekt › Forskning
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HARMONY: HARMONY - Harmonic identification, mitigation and control in power electronics based power systems
Blaabjerg, F., Bak, C. L., Wang, X., Beres, R. N., Kwon, J., Gui, Y., Yoon, C. & Ebrahimzadeh, E.
01/02/2013 → 28/02/2018
Projekter: Projekt › Forskning