A review of some of the most relevant strategies can be seen in numerous literature reports. In the literature, there is a wide collection of this type of primary techniques that can be integrated at AC, DC, and hybrid microgrids. Here, the lack of inertial response is partially replaced by the primary control of converter-interfaced devices connected to the microgrid. This is usually carried out by primary controllers, which are most of the times integrated locally in each device. One of the most common solutions is to configure the converters associated to DG, ESSs, and even loads to contribute to the voltage and frequency regulation of microgrids. Consequently, microgrids become more susceptible to failures- especially when operating in the islanded mode-and hence more advanced control strategies need to be adopted to replace the lack of inertial behavior and ensure a stable operation. This is one of the main challenging tasks in the management of microgrids, as lower inertia in the grid means that their voltage and/or frequency is significantly deteriorated under power variations. The main difference for microgrid control is that, at microgrids, conventional synchronous generators are replaced by converter-interfaced generation and storage systems, and therefore, the inertia of the grid is drastically reduced. Each control layer is responsible for certain functions, such as the voltage/frequency control or the management of the islanding/reconnection process. Inspired by the classical AC grid, the management of microgrids is most of the times carried out by employing a hierarchical structure.
Even if the control techniques employed at AC, DC, and hybrid AC/DC microgrids can be considerably different, their concept of operation is usually very similar. Īlthough microgrids are gaining a lot of interest, especially during the past decades, most of the challenges still reside in their control and management, especially when they operate islanded from the main grid.
#Are micro grids becoming more popular generator#
There is general agreement that microgrid controls must deliver the following functional requirements: present the microgrid to the utility grid as single self-controlled entity so that it can provide frequency control like a synchronous generator avoid power flow exceeding line ratings regulate voltage and frequency within acceptable bounds during islanding dispatch resources to maintain energy balance island smoothly and safely reconnect and resynchronize with the main grid. Microgrids feature special control requirements and strategies to perform local balancing and to maximize their economic benefits.
0 kommentar(er)
