Abstract: At the end of the grid and in areas not covered by large power grids, microgrids are better applied and developed, and effectively improve the level of local power supply, while connecting multiple microgrids into microgrid groups cansolve the problem of power supply in less densely populated areas. The control methods and strategies for microgrids and microgrid groups are summarized, analyzed and compared, some references are provided for the future development of microgrids and microgrid groups.