Optimal sizing of distributed generations in a connected DC micro-grid with hybrid energy storage system

This paper presents a model for calculating the optimal size of a grid connected DC micro-grid. Considering the differences between DC micro-grid and general AC micro-grid and the operating mode of the DC micro-grid system with hybrid energy storage system, the sum of the total capital, operational and maintenance cost of distributed generations (DGs) are set as the optimal objective. A numerical example is researched with the application of differential evolution algorithm. The optimum solution for sizing combination of DC micro-grid with hybrid energy storage system is obtained and compared with single battery storage, and the results verified the better performance of hybrid energy storage.