Application of adaptive droop method to boost converters operating at the output of fuel cells

Droop method is widely used to operate dc-dc converters in parallel. Although it is very simple and easy to use, poor regulation and uneven load sharing are the major limitations of the method. This paper presents a modified droop method to overcome these limitations. Proposed method is an adaptive technique that re-defines the droop coefficients after an initial period of operation. The method has been tested with three boost converters designed to operate at the output of a fuel cell. Results clearly show that better regulation and load sharing are achieved using the suggested technique.