Читать книгу Microgrid Technologies - Группа авторов - Страница 15

In recent years, a great number of researchers are discussing the issues in micro-grids. Nowadays, the verities of micro-grid structures have been presented in the literature. In micro-grid the different distributed generations are utilized because of its geographical characteristic, economic benefits, environmental condition and impact on the surrounding. In Ref. [5], there is a discussion on predictive MSE with its control strategies and communication of micro-grid to the independent utility grid. A 1.5 MW wind energy associated with the battery as a storage system is analyzed. In Ref. [6] a hybrid hydrokinetic system HKT battery is used in GC mode. The surplus power of HKT is utilized for charging a battery or trade to the grid. Whether the power will be sold to the main grid or not is determined by the charge condition of the battery and the principle of the utility grid network. The power requirement of the load is provided by the HKT. The excess power is utilized to charge the storage body. Then also, if there is an excess quantity of power, that can return back to the utility grid network. However, the utility grid supplies the load directly when the distributed generation system and the battery can’t entirely meet the load demand.

The universally used energy storage system is the battery. The battery system also has some limitations, as some charging and discharging current issues and unreliability according to the lifespan of the battery. So, techno-electronic indexes of micro-grid-based hybrid renewable energy resources are significantly increased by applying the distributed system of the generation with the storage system of energy [7]. Ref. [8] is a study of hybrid solar power as PV and diesel power in a distributed system supplying a load of a rural school in Ethiopia. The paper has compared the hybrid PV/Diesel distributed system with the storage system to the distributed generation system without storage as the net instantaneous rate of energy. Here a software named Homer is applied for analysis. The result was concluded that the hybrid distributed generation system with storage is having technical and economic advantages than that without storage. In Ref. [9] the authors proposed that the energy management system for hybrid micro-grid consist of photovoltaic and wind power as renewable energy sources (RES) and fuel cell (Hydrogen cell), ultracapacitor or battery as storage system of energy (SSE).