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Distributed Secondary Control Using a Low Bandwidth Communication Channel to Enhance Voltage Regulation and Current Sharing Accuracy in DC Microgrid

International Journal of Electrical and Electronics Engineering
© 2024 by SSRG - IJEEE Journal
Volume 11 Issue 6
Year of Publication : 2024
Authors : Shilpa L. Kaila, Rajnikant H. Bhesdadiya, Hitesh M. Karkar
10.14445/23488379/IJEEE-V11I6P127
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How to Cite?

Shilpa L. Kaila, Rajnikant H. Bhesdadiya, Hitesh M. Karkar, "Distributed Secondary Control Using a Low Bandwidth Communication Channel to Enhance Voltage Regulation and Current Sharing Accuracy in DC Microgrid," SSRG International Journal of Electrical and Electronics Engineering, vol. 11,  no. 6, pp. 250-258, 2024. Crossref, https://doi.org/10.14445/23488379/IJEEE-V11I6P127

Abstract:

Now, DC microgrids are more popular due to their easier control, higher reliability, and efficiency. The main control objective of a DC microgrid is to achieve good voltage regulation and current-sharing accuracy simultaneously. Traditionally, for proper current sharing, droop control is used. However it suffers from poor voltage regulation with an increase in load due to droop action and reduces current sharing accuracy due to differences in line resistance. This paper presents a distributed secondary-level control using a Low-Bandwidth Communication (LBC) channel to overcome the limitations of a droop control and enhance the performance of a DC microgrid. It contains two secondary controllers, the average current controller and the voltage controller, to calculate current and voltage errors. This error is used to generate a voltage shifting term for simultaneously improving voltage regulation and current sharing accuracy, regardless of the different line resistances. This control handles both Constant Power Loads (CPLs) and resistive loads. It also validates the most important plug-and-play feature of a DC microgrid. MATLAB / simulation is utilized to validate the results of the presented control technique.

Keywords:

Droop control, Voltage regulation, Current sharing, Microgrid, Distributed control.

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