جستجوی مقالات مرتبط با کلیدواژه "islanded" در نشریات گروه "برق"

Drop control is one of the conventional and widely used methods for microgrid control. Drop control is in the first level of hierarchical control, and it is used in microgrid to adjust voltage and frequency independently, and it does not need to be connected. This method offers high reliability, and is usually used in inverters that form microgrids. Microgrids can work in two modes connected to the network and island mode. In this article, an overview of the application of the drop control strategy in inverter-based island microgrids is presented according to the studies. Droop control is an example of decentralized control, and the importance of droop control in the islanded mode of operation will become apparent when it is possible to share energy among all units without the need to communicate with other units. In the drop control method, the frequency and voltage are adjusted according to the load demand and power balance in the network. This review study shows the importance of using drop control and its improvement in microgrids.

In power smart grids, equipment and electrical infrastructure and information smart grids in order to increase efficiency, improved reliability and reducing environmental pollution merged together. One of the basic challenges in such grids, increase uncertainty due to the use of distribution generation sources contain are renewable resources. In recent years has proposed the concept of the micro grid, it means a medium voltage distribution grid or low voltage grid includes distribution generation units, storage devices and different controlling loads with operational capability in both cases grid-connected and islanded. Because micro grid in the islanded, grid is with small power generation units, the smallest error it may be cause instability. It is therefore necessary so when passing through grid-connected to island make sure of sufficient storage in distribution generation generator according to their production capability curve in order to satisfy loads reactive and active power. The main focus of this research is on distribution generation unit’s reactive and active power scheduling for sustainable and economic operation from a micro grid. The need for a sustainable transition from grid-connected to island in case of an error in grid is one of the most important constraints in the micro grids. Therefore, must to be investigated economic scheduling of distribution generation units a micro grid considering these constraints. It should be noted that consideration these constraints in reactive and active power scheduling of distribution generation units can bring on more economic benefits in the steady pass from grid-connected to island. So, in this research will be presented formulation related to planning reactive and active power of distribution generation units by maintaining the constraints that its objective function will be to minimize the cost of power generation.