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Renewable Energy Sources And Reliability Of The Electric Power System Operation

Tatjana Lomane
RTU

Vladimir Nepomnyashchiy
Russian Academy of Natural Sciences

Anatolijs Mahnitko
RTU

Inga Zicmane
RTU

Timurs Kuzņecovs
High Voltage Department, Riga

Abstract
One of the main priorities of the development of modern energy is the transition from hydrocarbon energy to the using the renewable energy sources (RES). The relevance of this step is explained by such factors as saving the organic fuel and reducing the environmentally harmful emissions into the atmosphere, which lead to a change in the climate on Earth. However, at the same time, the influence of RES on the controllability of the operation modes of electric power systems (EES) and the reliability of their functioning remain completely unexplored. At the same time, the fact is completely ignored that the excessive increase in the share of wind power plants (WPPs) and solar power plants (SPPs) in the structure of the generating capacities of the EES begins to manifest itself in a sharp decrease in the reliability of the electric power industry functioning due to the neglect of a number of negative properties of WPP and SPP, which practically manifested themselves in a system accident in the power system of England on 9.08.2019, when as a result of an short circuit, a system accident occurred with a decrease in the frequency of alternating current to 48.8 Hz. The reason lies in the failure to take into account the increased sensitivity of WPP, SPP, gas turbine units (GTU) and gas piston power units (GPPU) to voltage and frequency decreases in conditions of insufficient the rotating power reserve. This damage could have been prevented by increasing the rotating reserve within the available reserve of the EPS, which would have required an increase in funds for its maintenance due to additional fuel consumption. The proposed paper is devoted to the study of the relationship between reducing the likely damage to consumers and the costs of additional fuel consumption to maintain the necessary power reserve in the power system. It offers an economic and mathematical model for studying the influence of WPP and SPPs, as well as GTU and GPPU. Having low inertia, these units have increased sensitivity to changes in frequency and voltage. The implementation of the proposed model makes it possible to economically justify the strategy and scale of the introduction of renewable energy into the electric power industry. The authors hope that their research can become the basis for drawing the attention of energy specialists to the inadmissibility of implementing a one-hundred-percent replacement of carbon energy with renewable energy. The authors hope that their research could become the basis for attracting the attention of energy specialists to the inadmissibility of the implementation of one hundred percent replacement of carbon energy with renewable energy.