Abstract

In order to solve the limitation of bus voltage deviation and uneven distribution of output current that traditional droop control is applied to DC microgrid, an improved droop control method is proposed. This method adopts the active measurement of line impedance and imports it into the sag coefficient by way of negative feedback, in order to Eliminate the adverse effects on the bus voltage and current distribution caused by the existence and inconsistency of the line impedance of each distributed power supply. Based on this theory, this paper calculates the line impedance by detecting the voltage difference between the head and the end of the line. Finally, the feasibility and effectiveness of the traditional droop control method are verified through modeling and simulation.

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