Study on protection Scheme for Micro-grid with Mobile Energy Storage Units

A method of dividing complex micro-grid into minor micro-grids and finally to the minimal micro-grid which consists of one AC bus or one DC bus is presented according to classification principles. The protection scheme of minimal micro-grid is discussed and then applied to the whole micro-grid. By analyzing parallel operation mode and islanding operation mode of micro-grid, the protection scheme of each mode is given respectively.