Methodology for substantiation of technical and economic indicators of PSPP in energy water management systems of Uzbekistan

Abstract

In our country, a lot of attention is paid to the development of the energy sector. A lot of work is underway to modernize existing capacities and commission new capacities. At the same time, the unit capacities of units and power plants also increase, which ensures faster commissioning of capacities in the power system and an increase in the efficiency of power plants. Attention is also paid to the development of power plants based on renewable energy sources (hydraulic, solar, wind, etc.). One of the most important tasks in the power industry is to cover peak minimum and maximum loads, which is becoming increasingly important in connection with the growth of the power system's capacity. As is known, according to world indicators, the maneuverable capacities should be about 25% of the total power of the EPS. The most promising maneuverable capacities are hydroelectric power plants. However, in our country, hydroelectric power plants account for about 14.3%. This task will become more complicated with the introduction of capacities based on solar and wind energy and the commissioning of new hydroelectric and thermal power plants in the Republic. This is because RES capacities have a significant discontinuity even during the day, and the water resources in the Republic are primarily for irrigation and drainage purposes and are significantly variable during the season. One way to solve these problems in the world is the creation and use of pumped storage power plants (PSPP). The peculiarities of the creation and use of pumped storage power plants in our region are that the available hydro resources of our region are mainly of water management importance, while the task is also to increase the energy efficiency of existing reservoirs. Based on the foregoing, we can say that the development of methods for determining the economic efficiency of pumped storage power plants, taking into account direct and indirect effects, taking into account the peculiarities of their use in energy and water management systems of Uzbekistan is the main task for the present time. To solve the set tasks, a new methodology and program for substantiating the technical and economic indicators of pumped storage power plants in Uzbekistan's energy and water management systems have been developed. The schemes of using pumped storage power plants at four energy and water management facilities, that is, the Tuyamuyun hydro subunit, Arnasai, Talimarjan, and Khodjikent reservoirs, were considered, and for these facilities, based on the developed methodology and program, their technical and economic parameters of the pumped storage power plant were determined. Based on the results obtained, it can be said that using the PSPP in four facilities, it is possible to generate a total of about 418 MW of capacity and more than 930.0 million kWh of electricity, as well as to save 139 thousand tons of fuel equivalent per year, with this, the annual economic efficiency will be about 700.0 billion sums.

Methodology for determining technical, economic and environmental performance of combined power plants

“…Annual electricity generation for the consumer E consumers : where t days are the days of work during the year (330 days can be accepted for the conditions of Uzbekistan); E fullday is the generation of electricity during the day for the consumer [1,3].…”

“…All over the world, scientific research is being conducted to improve operating modes and methods aimed at improving the energy, economic, and environmental efficiency of power plants based on renewable energy sources in separate and combined use, aimed at reducing the cost of fuel resources, greenhouse gas emissions, the cost of electricity received and the payback period of power plants [1,2,3]. In this direction, including through the development of effective methods for managing operating modes and technological schemes of combined systems based on renewable energy sources, research is considered a priority to determine the economic feasibility [4,5,6 ] and assess the reliability, stability, and safety [7,8] of electricity generation.…”

“…Currently, methods for assessing the economic efficiency of various combined power plants have been developed in the economy [1,2,3,4,5]. However, due to the increasing urgency of environmental problems, there is a further development of methods for determining the economic efficiency of combined power plants that consider environmental issues [1].…”

“…Experimental studies of PVM were conducted on the territory of the Tashkent State Technical University (Department of "Hydropower and Hydraulics). The areas of activities of the department are the calculation of improving the efficiency of hydraulic structures [20,21,22], especially pumping stations [3,7,11,23] and hydroelectric power plants [13], as well as power plants based on renewable energy sources [1,3] and especially combined with hydropower plants [9,12]. Currently, one of the main areas of scientific research is the study of the operating modes of power plants based on renewable energy sources and the development of methods for assessing economic efficiency.…”