A Droop-Controlled Interlink Converter for a Dual DC Bus Nanogrid with Decentralized Control

Ahmad M. A. Malkawi (), Ayman AL-Quraan and Luiz A. C. Lopes
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Ahmad M. A. Malkawi: Mechatronics Engineering Department, Engineering Faculty, The University of Jordan, Amman 11942, Jordan
Ayman AL-Quraan: Electrical Power Engineering Department, Hijjawi Faculty for Engineering Technology, Yarmouk University, Irbid 21163, Jordan
Luiz A. C. Lopes: Department of Electrical and Computer Engineering, Concordia University, Montreal, QC H4B 1R6, Canada

Sustainability, 2023, vol. 15, issue 13, 1-25

Abstract: This paper proposed a dual DC bus nanogrid with 380 V and 48 V buses and allows the integration of distributed energy resources on two buses. The proposed system employs an interlink converter to enable power sharing between the buses. The integration of distributed energy resources has been found to enhance the reliability of the low-voltage bus in comparison to those that lack such integration. The integration process requires the introduction of a new V-I curve for the interlink converter within a DC nanogrid controlled by DC bus signaling and droop control. Furthermore, selecting a power electronics converter for the interlink converter is essential. This paper employs a dual active bridge with galvanic isolation as an interlink converter and proposes a control strategy for the converter that relies on DC bus signaling and droop control. Moreover, this control methodology serves the purpose of preventing any detrimental impact of the interlink converter on the DC buses through the reprogramming of the V-I curve. Subsequently, the suggested control methodology underwent simulation testing via MATLAB/Simulink, which included two different test categories. Initially, the DAB was evaluated as an interlink converter, followed by a comprehensive assessment of the interlink converter in a complete dual DC bus nanogrid. The results indicate that the DAB has the potential to function as an interlink converter while the suggested control approach effectively manages the power sharing between the two buses.

Keywords: distributed energy resources; dual DC bus nanogrid; nanogrid; interlink; PV system; battery converter; droop control; DC bus signaling (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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