AC DC microgrid structure

What are hybrid AC/DC microgrids?

Hybrid ac/dc microgrids are one of the most interesting approaches towards the development of the smart grid concept in the current distribution network. A typical hybrid microgrid structure is shown in Fig. 1, where the ac and dc networks can be distinguished.

What is AC microgrid structure?

3.1. AC microgrid In AC microgrid structure, an AC bus is created, and all microsources with variable frequency and variable voltage AC output are connected to AC bus through AC/AC power electronics converter. Sources with DC output are connected to AC bus through DC/AC converter.

Is there a comparison between AC and DC microgrids?

Some studies can be found where the main characteristics of ac and dc microgrids are compared, as in , , , but the hybrid approach is not considered in these comparisons. Consequently, there are almost no studies related to the architectures or the topologies of these networks.

Is ac/dc microgrid a good choice for smart building?

There are ac, dc, and hybrid ac/dc microgrid. However, the single form of dc or ac microgrid cannot realize the efficient utilization of DGs and cannot meet the diversified demand. Therefore, the hybrid ac/dc microgrid architecture is of more value for smart building than single ac or dc forms .

What is a dc microgrid?

Normally, DC loads are low-power rating electronic devices such as laptops, cell phone, wireless phones, DVD players, battery-powered vacuum cleaner, and Internet routers. In DC microgrid structure, sources with DC output are connected to DC bus directly, whereas sources with AC output are interfaced to DC bus through AC/DC converter .

What is grid-connected mode of ac/dc microgrid?

In the grid-connected mode, the ac microgrid and the dc microgrid are connected to the medium voltage distribution network via the MMC-SST. In this mode, the ac microgrid and dc microgrid are considered as a whole, i.e. the hybrid ac/dc microgrid.