Microgrids are electricity distribution systems containing interconnected loads and distributed energy resources that can be operated in a controlled and coordinated way. They can be operated independently as an island or in connection with the main grid.
The primary classification revolves around the orientation of their rotor axis, leading to two main categories: horizontal-axis turbines (HAWT) are the most common and look like propellers on a tall tower and vertical-axis turbines (VAWT) have blades attached from top to bottom.