The purpose of the article is to develop, based on the generalization of domestic and foreign experience, guidelines for enhancing investment in the agricultural sector. Research methods. A set of special methods of economic research was used during the research process. Using abstract-logical method, the conclusions to the article are formulated. The method of theoretical generalization was used in the critical analysis of research results of domestic and foreign scientists on the substantiation of investment factors and methods of assessing the effectiveness of investment. In the process of analysis, the statistical and economic method was used, which made it possible to clearly identify the factors that affect investment activity in the agricultural sector of Ukraine. Research results. The current state of investment activity in the agricultural sector of Ukraine is studied. The main factors influencing the intensification of investment in agricultural development in Ukraine are identified. Methods of state stimulation of investment activity are analyzed. Scientific novelty. A scientific approach to the introduction of a program of state support for dairy producers by introducing subsidies for the growth of each head of cattle introduced into the main herd, which will provide an economic incentive to attract investment in the livestock industry. Practical significance. The main factors that negatively affect the intensification of investment activity in the agricultural sector of Ukraine have been identified. The need to restore the special VAT tax regime for agricultural enterprises that simultaneously produce livestock and crop products (except for chicken producers) as the most effective method of state support for their activities has been confirmed. It is proved that in order to introduce effective mortgage lending it is necessary to resume the activities of a specialized institution - the State Mortgage Bank. Tabl.: 2. Figs.: 1. Refs.: 12.

The purpose of the article is to calculate the potential for energy independence of the agro-industrial complex of Ukraine based on the sustainable development principles. Research methods. Among the methods used: abstract-logical (to determine the essence and mechanisms of ensuring energy independence of economic systems and the agro-industrial complex); economic and statistical (for analyzing the potential of renewable bioenergy in order to form energy independence); comparative analysis (to determine the institutional contours of the priority of the use of renewable bioenergy in the formation of energy independence of the agro-industrial complex). Research results. The area of agricultural land is calculated, which will ensure the cultivation of the required amount of crop and livestock products for food consumption in accordance with the norms of the physiological needs of the population of Ukraine in basic nutrients. The analysis of the export of agricultural products by commodity groups was carried out and the calculations of the amount of agricultural land required for its provision were made. The volume of gross international reserves and the trends of their formation in dynamics from 2009 to 2020 are analyzed. Scientific novelty. The world volume of corn production, corn export by the largest producing countries and the share of its processing for biofuels were investigated. Studied and systematized the foreign experience of the USA, Germany, Brazil, Czech Republic, China, India and other countries-producers of biofuel, which use as raw materials sugarcane, corn, sugar beet, corn silage, animal husbandry and crop waste. Practical significance. The formation of the structure of sown areas under energy crops with high rates of bioenergy yield from one ton of raw materials and one hectare of sowing has been carried out, as well as the calculation of the possible volumes of production of such energy in Ukraine. The number of livestock of farm animals husbandry is given, the volume of animal waste generation in Ukraine and the potential for biogas production from manure are calculated. In addition, it was found that the agro-industrial complex of Ukraine, without a threat to the food security of the state and export potential, has the ability to provide energy independence of the agro-industrial complex of Ukraine and the state as a whole.

Analyses of trends increasing annual wind power plant capacity and power generation in the World and Europe are presented in this paper. Investigated main problems of increasing the power generation of renewable energy sources in distributed power grids. Proposed ways to decide them by taking into account the supply of power balance, reliability operating of the power grid, and electric power quality. Observed the daily power generation during the 2019 year for typical onshore wind power plant, which consists of 1 turbine type V-100/2.00 MW. The influence of the meteorological factors on the power generation of RESs was determined with usage Spearman's rank correlation coefficient.

Several methods of defining and estimating the width of a turbulent wake are presented and tested on the experimental data obtained in the wake past an asymmetric prismatic airfoil NACA 64(3)-618, which is often used as tip profile of the wind turbines. Instantaneous velocities are measured by using the Particle Image Velocimetry (PIV) technique. All suggested methods of wake width estimation are based on the statistics of a stream-wise velocity component. First, the expansion of boundary layer (BL) thickness is tested, showing that both displacement BL thickness and momentum BL thickness do not represent the width of the wake. The equivalent of 99% BL thickness is used in the literature, but with different threshold value. It is shown that a lower threshold of 50% gives more stable results. The ensemble average velocity profile is fitted by Gauss function and its σ-parameter is used as another definition of wake width. The profiles of stream-wise velocity standard deviation display a two-peak shape; the distance of those peaks serves as wake width for Norberg, while another tested option is to include the widths of such peaks. Skewness (the third statistical moment) of stream-wise velocity displays a pair of sharp peaks in the wake boundary, but their position is heavily affected by the statistical quality of the data. Flatness (the fourth statistical moment) of the stream-wise velocity refers to the occurrence of rare events, and therefore the distance, where turbulent events ejected from the wake become rare and can be considered as another definition of wake width. The repeatability of the mentioned methods and their sensitivity to Reynolds’ number and model quality are discussed as well.

This paper presented research small- and mini-hydroelectric power plants as an effective source of compensation for instability of non-guaranteed renewable energy sources (RES) power plants. HPPs play the main role for balancing the power system operation mode. To somehow compensate for the growth of RES generation in the power system, we can forced to start hydropower plants as a consumer in the pump mode. This paper investigated the trends of installed capacity hydroelectric power plants (HPPs) for World and for Ukraine. Also, it was considered the dynamics of change of the annual amount of hydroelectric power generation (HPG) on data International Renewable Energy Agency (IRENA) for World and for Ukraine. Is shown the classification of HPPs on value green tariff and installed capacity. Observed the distribution of the daily power generation during the 2019 year by typical mini-HPP. Compared the experimental and calculation value power generation by typical mini-HPP in 2019. Researched of influence the meteorological factors on power generation of mini-hydropower plants using Spearman's rank correlation. Proposed for HPG used cascade small- and mini HPPs.