Theoretical studies of the vegetable store operation using a complex of renewable energy sources

The problem of storing vegetables and fruits affects many farms, as well as large agricultural enterprises. Each manufacturer wants to keep the presentation of the product in the same form in which it received at the time of collection, increasing the shelf life until it is fully sold and purchased by the consumer. With climate change on the territory of Russia, many enterprises have been able to diversify the sown crop, increase the volume of production, and also expand the area for growing vegetables. With the growth in the volume of manufactured products for agricultural enterprises, there is a need to create modern high-tech facilities for the storage of vegetables or the construction of additional vegetable stores. The purpose of the article is to explore and develop a simulation mathematical model for the operation of an energy complex using an extended range of renewable energy sources in an integrated system. To describe the functioning of the complex of renewable energy sources (RES), the mathematical model contains models of individual elements of the energy generating system. When modeling the operation of the complex, the processes of functioning of the heat consumption system of the vegetable store are simulated, in addition, the mathematical model of the complex includes models for generating electrical energy by a wind power plant (WPP) and photovoltaic panels (PV panels). The key point of the simulation model is the functioning of electric batteries. The mathematical model was implemented in the Microsoft Excel environment using the built-in Visual Basic package. The developed model was used to simulate the operation of a potato storage with a capacity of 1000 tons of arched type. When modeling, we used weather data for the city of Yoshkar-Ola (Mari El River) for the period from September 1, 2020 to May 1, 2021. The technological cycle of potato storage was also modeled: the treatment period, the cooling period, the main storage period, the period of preparation for sale. Each period was characterized by its own temperature regime and ventilation regime. The simulation results (heat losses, potato storage power consumption by days, power generation by photovoltaic and wind turbines by days, daily battery charge) are presented in the article.