Various Load Sharing Strategies used in DC Microgrids

Abstract

This paper provides a review of various load sharing strategies used in DC microgrids.  DC microgrids usually utilize parallel connections of DC-DC converters to improve system reliability and flexibility. However, when connecting multiple converters in parallel in a microgrid, the resistance of the cables becomes a critical factor. Unequal load distribution and inadequate voltage control result from cable resistance, leading to the generation of circulating current. The equal load sharing can be achieved by active load sharing and passive load sharing method. These two broad categories encompass a wide range of control schemes. This paper provides a comprehensive analysis of active and passive load sharing strategies, highlighting their advantages and disadvantages. Very Few researchers have explored the influence of cable resistance on load sharing and voltage regulation. Also, the effect of circulating current on the converter is a relatively unknown factor that must be identified and reduced to the greatest extent possible. This paper is a valuable resource for future researchers who are interested in studying load sharing and related control techniques.