The object of the study is to increase the stability and economic efficiency of the joint operation of the solar power plant and an energy storage system in the power system. The subject of the study is the methods and models for determining the optimal parameters of the grid power plant and an energy storage system, the joint economic and effective functioning of which in the power system will ensure the maintenance of the stability of the electricity supply at the declared level.
The purpose of the study is to determine the optimal parameters and modes of joint operation of the solar power plant and an energy storage system, the joint economic and effective functioning of which will ensure the maintenance of the power supply of electric energy to the power system at the declared level.
The following scientific research methods were used in the work: system analysis; non-linear programming; statistical; calculated; technical and economic assessment.
Theoretical and practical significance of the obtained results. The developed method of determining the technical parameters of the equipment of the solar power plant should be used to assess the competitiveness of their operation in the modern market conditions of the introduction of new generating capacities in power systems. The developed method of determining the nominal technical parameters an energy storage system, which is included in the structure of the solar power plant, should be used to determine the nominal capacity and power of an energy storage system, which are necessary to maintain the power of the electricity supply to the power system at the declared level, including in accordance with the load needs, in order to reduce the volume of maneuverable reserves, which are used in the power system to compensate for the daily increase/decrease in the power of the solar power plant, which occurs when the intensity of solar radiation changes. The results of the developed technical and economic evaluation method should be used to determine the profitability of the introduction of hybrid solar power plants, the structure of which includes an energy storage system, taking into account the current and prospective conditions on the electricity market.
Scientific novelty of the obtained results. For the first time, a non-linear optimization mathematical model for determining the technical parameters of solar power plant equipment has been developed, which takes into account the dependence of the daily levelized cost of electricity production on project technical and economic indicators and the daily change in the intensity of solar radiation, which allows finding the optimal ratio of the installed capacity of inverters and photovoltaic modules.
For the first time, a method for determining the technical parameters of solar power plant equipment has been developed, which consists of a systematic set of steps using a nonlinear mathematical model to determine the technical parameters of its equipment at a given intensity of solar radiation during the year and to determine the most cost-effective ratio of the installed power of inverters and photovoltaic modules, which ensures the minimum cost of production electricity and increasing the competitiveness of such investment projects.
For the first time, a calculated mathematical model for determining the technical parameters of an energy storage system, which is part of the structure of the solar power plant, has been developed, the use of which, unlike existing models, allows you to find the nominal capacity and power of an energy storage system, which ensures the preservation of excess electrical energy of photovoltaic modules during peak intensity solar radiation, maintaining the power of the electric energy supply to the power system at the declared level during one full battery charging/discharging cycle and in accordance with the needs of electric energy consumption.
For the first time, a method was developed for determining the technical parameters and modes of joint operation of an energy storage system, which is part of the structure of the solar power plant, with the use of a mathematical calculation model for determining the nominal capacity and power of an energy storage system, which, in accordance with the developed modes, ensures the stabilization of the power supply of electricity to the power system at the declared levels and excludes the use of maneuverable reserves, which are used to compensate for the daily increase/decrease in the capacity of solar power plants.
The method of technical and economic evaluation of the implementation of investment projects of hybrid power plants has received further development, which takes into account the developed modes of joint operation of the solar power plant and an energy storage system to increase the economic efficiency of using the available capacity of storage batteries due to the purchase of additional electricity on the competitive market.
