Abstract
In a DC microgrid, droop control is the most common and widely used strategy for managing the power flow from sources to loads. Conventional droop control has some limitations such as poor voltage regulation and improper load sharing between converters during unequal source voltages, different cable resistances, and load variations. This paper addressed the limitations of conventional droop control by proposing a simple adaptive droop control technique. The proposed adaptive droop control method was designed based on mathematical calculations, adjusting the droop parameters accordingly. The primary objective of the proposed adaptive droop controller was to improve the performance of the low-voltage DC microgrid by maintaining proper load sharing, reduced circulating current, and better voltage regulation. The effectiveness of the proposed methodology was verified by conducting simulation and experimental studies.
Highlights
Control Applied to Low-Voltage DCRecently, many researchers have been attracted to the development in integrating different power resources in a distributed approach
An LVDC microgrid was studied by considering two sources connected in parallel with dc–dc converters, and the phenomena of load sharing and circulating current occurrence during the parallel operation were projected
We proposed a simple and robust adaptive droop control based on mathematical calculations, adjusting the droop parameters
Summary
Many researchers have been attracted to the development in integrating different power resources in a distributed approach. A different droop method for the parallel operation of converters was proposed, which utilizes the base voltage of every unit to adjust and control automatically [21]. Droop index was introduced, which is a function considering normalized current sharing differences and the losses in the output side of converters This method results in accurate load sharing, it involves considerable computational effort. Many other research works have been carried out in a wide range to regulate the voltage on the DC bus and maintain proper current sharing with the consideration of load variation and cable resistance, but only little consideration has been given to the input variables such as input voltage and input current from the source side. An algorithm was developed to ensure the robustness of control with the consideration of both input and output parameter variations
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