Lysenko O. Scientific bases of increasing energy efficiency and quality of power supply in electrotechnical systems with combined generation

The paper reviews the state and prospects of providing consumers with electricity in electrica The paper reviews the state and prospects of providing consumers with power in electrical systems with combined generation. The world experience of using renewable energy sources (RES) was analyzed. A review of the RES impact factors on the operation of local electro-technical systems (LES) was made. The analysis of meteorological data that characterize the operation of solar and wind power plants was carried out. The initial data on wind energy for the southern region of Ukraine were taken from the measurements at the Botiivska wind power plant (WPP). Solar radiation was estimated both from available data and actual data in the area of Tokmak Solar Power Plant (SPP). The data that characterise electricity consumption in the studied region were investigated. For the southern region (area of Zaporizhia region) a study was conducted in order to find the opportunities of matching the generation of RES with electricity consumption, similar studies of load schedules were performed. The analysis of random components of electricity consumption graphs was carried out on the example of the long-term data for several settlements and local enterprises of Melitopol district of Zaporizhia region. The construction of criteria and the system of constraints that determine the optimal functioning of wind-solar generation was considered. The methodology and examples of calculation of balance reliability indicators and their confidence intervals for LES were given. In order to increase energy efficiency, namely, the fullest use of the installed RES capacity, the optimal combination of wind farms and SPPwas considered, provided that the uncontrolled scatter of the generated power values is minimized while maximizing the produced energy. The analysis of needs in reserve and accumulation of energy in complex systems with RES was conducted.