MODEL OF AN ENERGY-EFFICIENT POWER GRID OF AN INDUSTRIAL ENTERPRISE WITH DISTRIBUTED GENERATION

The integration of distributed energy sources into the power grids of industrial enterprises and the development of sustainable energy, which involves the use of low-capacity power facilities, require corresponding changes in the structure of the centralized power supply system. The use of distributed generation increases the reliability of electricity supply to consumers, simplifies the transmission and distribution of electricity between them. However, at the same time, unstable power generation by renewable energy sources can cause unwanted energy flows and additional power losses. The article proposes a model of an industrial enterprise power grid consisting of three local grids: high-quality and low-quality AC power and the DC grid that unites them. Such a scheme fully meets the requirements for the above-mentioned local modules, significantly simplifies the integration of renewable energy sources into it, makes it unnecessary to ensure the quality of the entire volume of consumed electricity, the electromagnetic compatibility of loads and the grid itself with the distribution one, and significantly reduces the number and total power of power electronics devices used. The described structure of the power grid will also create an effective unified system for managing the process of electricity consumption at the enterprise, into which modern communication technologies of the Smart Grid can be integrated. To study the proposed power grid by computational methods, a mathematical model is synthesized and its use is considered on the example of a simulated industrial enterprise. The developed mathematical model allows to calculate the steady-state modes of operation of local power grids, taking into account possible places of connection of energy storage devices, sources of distributed generation, etc. The proposed approach makes it possible to choose the optimal variant of connecting distributed generation to the enterprise's power grids, to eliminate unwanted power flows and reduce energy losses in them.