A Survey Paper on- Analysis of Centralized Control in Micro-Grid

In the context of Electrical Engineerings, the hierarchical control scheme includes three control levels: primary, secondary, and tertiary. These control levels differ in their (i) speed of response and the time frame in which they operate and (ii) infrastructure requirements, e.g., need for communication. This control hierarchy can also be implemented for the micro grid control. The DER units with limited power generation capacity cannot practically assist a strong utility network in its voltage and/or frequency regulation. In the grid connected mode, the host utility may not permit regulation or control of the PCC voltage by the DER units to avoid interaction with the same functionality performed by the grid. The DER units with limited power generation capacity cannot practically assist a strong utility network in its voltage and/or frequency regulation. In the grid connected mode, the host utility may not permit regulation or control of the PCC voltage by the DER units to avoid interaction with the same functionality performed by the grid.