Abstract

One of the most important challenges in today's electricity sector is to develop electricity generation technologies that are friendly to the environment as possible at the lowest cost of electricity. The lowest costs of electricity currently have solar, wind, and hydropower plants, while power plants based on fossil fuels are lagging significantly. This article provides a brief overview of possibilities to build a microgrid using the infrastructure of a small-scale hydroelectric power plant (HEPP) added by a floating solar power plant (PVPP) and wind power plants (WPP). As the authors' review of information and practical experience shows, the world still does not sufficiently appreciate the benefits of microgrids of this structure and the advantages of optimizing the ratios of electrical powers operating in them. Estimates have been made in this study to determine the power limits produced by the microgrids based on small-scale HEPPs. The calculations made sure that the capacity of a floating solar power plant installed in the area of the upper reservoir may be tens and hundreds of times larger than the already existing capacity of the HEPP. Half of the upper reservoir area of the pico-scale Svobiskis HEPP in a rural area on Virinta River is sufficient to install a floating PVPP capacity of 8 MW when the rated capacity of the HEPP is only 0.04 MW. The low water surface roughness of HEPPs' upper reservoirs makes conditions for higher wind speed and power.

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