Discussion on theory and technology of building robust intelligent power grid in coal mine of China

In view of the problems existing in the coal mine power grid in the process of intelligent mine construction in coal mines and the development status of intelligent power grid at home and abroad,this paper puts forward the idea of building a robust,safe and intelligent control “coal mine robust intelligent power grid” with coal mine characteristics and advantages. This paper analyzes the trend of underground power load concentration and the causes of frequent ac- cidents,points out the shortcomings of coal mine power grid structure,monitoring and protection,and puts forward the construction concept of coal mine intelligent power grid,which is “robust and intelligent,smart and robust together”. The topology structure of robust intelligent power grid in coal mine is given. The robust intelligent power grid of coal mine mainly includes:building a robust and scientific redundant power grid structure with advanced materials,equipment and technology;constructing a continuous big data monitoring perception system for static safety parameters and dynamic operation of power grid,an analysis and judgment intelligent control system based on deep learning and an intelligent power grid communication system based on 5G network to realize coal mine electricity network pre-sensing, intelligent control and interconnection. This paper describes four basic characteristics of the coal mine robust smart grid,which are self-perception,self-improvement safety,self-healing and self-reserve distributed power. Taking advantage of the unique advantages of coal mines,the self-reserve power supply with water storage power generation and compressed air storage power generation as the core is constructed. It is also proposed to find out the shortcomings of China’s coal mine smart grid technology,focus on research and overcome,in-depth study of high-performance sensing technology,high-end technical equipment and intelligent control system of coal mine smart grid,formulate technical standards of coal mine robust smart grid,and speed up the development of coal mine robust smart grid.