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An improved droop control algorithm for load sharing and circulating current control for parallel DC-DC converters in standalone DC microgrid
Published in Institute of Electrical and Electronics Engineers Inc.
2014
Abstract
This paper discuss the relationship between load sharing and circulating current for parallel connected dc-dc converters. In the proposed algorithm a new figure-of-merit called Droop Index is introduced, which is a function of normalized current sharing difference and losses in the output side of the converters. This algorithm minimizes the circulating current and current sharing difference between the converters based on the virtual resistance, Rdroop values. This also eliminates the trade-off between current sharing difference and voltage regulation. By calculating negative Rdroop values, the algorithm gives better performance and low voltage regulation. The detailed analysis and design procedure are explained for two dc-dc boost converters connected in parallel. The effectiveness of proposed method is verified using MATLAB simulation. © 2014 IEEE.
Concepts (11)
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    Algorithms
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    Economic and social effects
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    Electric power distribution
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    MATLAB
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    Voltage regulators
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    Circulating current
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    Dc micro-grid
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    DROOP INDEX
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    Load sharing
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    Parallel dc-dc converters
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    Dc-dc converters