Abstract
The power grid in the new power system will present a grid pattern in which large power grids, highly autonomous local power grids and Micro grids coexist. If the DC power generation unit or load is connected to a DC micro grid with a suitable voltage level, part of the AC/DC conversion device will be omitted, the loss and the cost will be reduced after being scaled up. With the rapid growth of DC load and the large-scale development of DC characteristic power sources such as wind and solar storage, DC Micro grid will greatly increase and become an important part of the construction of a new power system with new energy as the main body. This paper analyzes the load of heavy trucks in green mines, selects main equipment and control and protection schemes, and builds a DC micro-grid solution based on the characteristics of the new power system. This scheme has a certain demonstration significance for the promotion and application of DC micro-grid in green mines.
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