Microgrid and distribution network grid connection voltage

Are microgrids a viable solution for integrating distributed energy resources?

1. Introduction Microgrids offer a viable solution for integrating Distributed Energy Resources (DERs), including in particular variable and unpredictable renewable energy sources, low-voltage and medium-voltage into distribution networks.

Why should a microgrid be connected to a utility grid?

As a link and buffer between the distribution network and DER, a microgrid connected with utility grid is always regarded as an effective method to ensure power supply reliability and utilization of DER.

What is a grid-connected microgrid?

Grid-connected microgrids are largely adopted to support the integration of DG units and, in particular, of renewable energy sources (RES) in distribution networks .

What is a dc microgrid?

The DC microgrid can be applied in grid-connected mode or in autonomous mode. 119, 120 A typical structure of AC microgrid is schemed in Figure 4. The distribution network of a DC microgrid can be one of three types: monopolar, bipolarn and homopolar. In an AC microgrid, all renewable energy sources and loads are connected to a common AC bus.

What is a microgrid?

The term “microgrid” refers to the concept of a small number of DERs connected to a single power subsystem. DERs include both renewable and /or conventional resources . The electric grid is no longer a one-way system from the 20th-century . A constellation of distributed energy technologies is paving the way for MGs , , .

How to control microgrid voltage?

As can be noted, depending on the microgrid size, one can choose to use decentralized controllers rather than centralized ones, and to implement control methods aimed at improving the microgrid power quality rather than that aimed at flattening the voltage profile. Table 7. Summary of main Microgrid voltage control strategies.