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| Content Provider | IET Digital Library |
|---|---|
| Author | Takantape, Morteza Mansouri Allahverdinejad, Babak Hamzeh, Mohsen |
| Abstract | In DC microgrids, if the oscillatory current is not shared among DGs, it may cause unallowable voltage distortion and overcurrent. In this paper, a distributed cooperative control scheme is introduced for DC microgrids in order to effectively share both the DC and the oscillatory components of current among DC sources. The hierarchical control method comprises four primary controllers namely voltage controller, conventional droop, oscillatory current droop and virtual conductance units, and three secondary controller units based on cooperative control principles. The primary controllers on each DG unit only use DGs' local information, while secondary controllers also require information of other DG units. In the secondary control part, firstly, via using the cooperative control, the DC current-sharing becomes accurate. Then, a novel droopbased oscillatory current-sharing controller unit is proposed in which by using the consensus method the error of oscillatory current-sharing is significantly reduced. A voltage observer, based on cooperative control is employed to compensate the inevitable voltage drop in DC microgrid, caused by droop controller. The voltage oscillation caused by oscillatory current-sharing unit is decreased through implementation of a virtual conductance signal applied to the inner current controller. The presented method is validated by a simulation with several cases. |
| Starting Page | 246 |
| Ending Page | 253 |
| Page Count | 8 |
| Volume Number | 3 |
| e-ISSN | 25152947 |
| Issue Number | Issue 2, Apr (2020) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-stg/3/2 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-stg.2018.0239 |
| Journal | IET Smart Grid |
| Publisher | The Institution of Engineering and Technology |
| Publisher Date | 2019-08-07 |
| Access Restriction | Open |
| Rights License | Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/) |
| Subject Keyword | Control of Electric Power System Control Principles Controller Unit Conventional Droop Current Control DC Current-sharing DC Microgrid DC Sources DG Local Information Distributed Generations Distributed Power Generation Distribution Network Droop Controller Electric Current Control Hierarchical Control Method Inner Current Controller Oscillatory Component Oscillatory Current Droop Oscillatory Current-sharing Unit Power Distribution Control Power Generation Control Power System Control Secondary Controller Secondary Controller Units Single-phase Load Three-phase Load Unallowable Voltage Distortion Virtual Conductance Units Voltage Control Voltage Controller |
| Content Type | Text |
| Resource Type | Article |
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