Structure of the power gridIsolated grids
A power grid is characterised by the interconnection of different loads and generators. In addition to fossil fuel-fired power plants and renewable energy generation systems such as photovoltaic systems and wind turbines, transformers are also considered to be generators in power grids. If a power grid is not connected to other power systems, it is referred to as an isolated grid. In practice, isolated grids are only deployed very rarely – for example in thinly populated areas. Interconnected grids occur much more frequently.