Abstract

This paper addresses, the improvement of DC (direct current) microgrid voltage stability and loadability. When the DC microgrid starts feeding the loads, the DC bus voltage drops. In presence of both static and dynamic loads with different loading conditions, the drop in voltage becomes significant. A solar photovoltaic (PV) fed DC microgrid is considered in this study. Both static load and dynamic load (DC motor) are considered to be connected in the DC microgrid. The effect of droop control and the conventional control in presence of both types of loads for constant solar insolation condition are compared to establish the effectiveness of the droop control technique. Two parallel connected PV modules and their corresponding controllers with variable load were modelled in PSCAD/EMTDC software.

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