Minimization of Circulating Currents in Parallel DC-DC Boost Converter Using Non-Linear Droop Control for Battery Energy Storage System
DOI:
https://doi.org/10.13052/dgaej2156-3306.37320Keywords:
Battery storage converter, non-linear droop control, circulating current minimization, and converter redundancy.Abstract
Battery is considered the most dominant energy storage device for renewable
energy-based DC microgrid systems (RE-DCMG) because of its ability to
store energy for a longer duration. Here the power electronic converter plays
a vital role, which acts as a bridge between the energy storage system and DC
microgrid. One of the main reasons for the failure of battery systems due to
the failure of the power electronic converters. To improve the redundancy and
converter failure issues of battery energy storage systems (BESS), parallel
operation of multiple converters are required. However, the parallel operation
faces an issue of voltage imbalance between the converters which gives rise to
an input circulating current. To address these issues, in this paper, we propose
a nonlinear droop control based parallel DC-DC boost converter for battery energy storage system. The nonlinear droop control strategy ensures the
equal battery current sharing between the parallel converters and good output
voltage regulation. Moreover, SOC based controller avoids over-charging and
over-discharging of the battery and the parallel converters ensure the redun-
dancy in operation. The proposed system is designed and implemented in the
MATLAB/Simulink and compared with the existing linear droop control.
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