Abstract
Microgrid(MG) pursues its economic power distribution in order to maximize its efficiency and also business expansion. To achieve it, an energy management system(EMS) is key technology. The ultimate pursuit of the MG is to minimize the use of diesel fuel by making the most of renewable energy. This paper proposes a power control algorithm of energy storage system(ESS) in stand-alone MG that considers the hosting capacity as an index to minimize the size of diesel generator(DG) capacity. For this, the ESS is installed at the end of the line of the MG and uses a bi-directional power flow between the DG and the ESS to increase the hosting capacity of the load and renewable energy. In addition, by using ESS, customers and renewable energy exceeding the capacity of DG are stably introduced without adding facilities to the grid. The simulation results using Matlab/Simulk show the effectiveness of the proposed algorithm.
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