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Item Electric drive with frequency-regulated synchronous motor with high precision digital sensors(СНУ ім. В. Даля, 2024) Rudniev, Y. S.; Romanchenko, J. A.; Brozhko, R. M.; Руднєв, Є. С.; Романченко, Ю. А.; Брожко, Р. М.The article studies an electric drive with a frequencyregulated synchronous motor. The main advantages of synchronous motors in comparison with asynchronous ones are listed. The current state and the growth trends in the production of AC electric drives are considered. It is shown that two-link frequency converters have received the greatest application for wide-range regulation of rotation frequency of synchronous motors. They convert the electricity from supply network into electricity with the required voltage, current and frequency in two stages. This transformation is carried out by special devices – autonomous inverters. It has been established that the efficiency of a two-link frequency converter is quite high and about 96,5-98,5%, which is due to the efficiency of the power semiconductor devices used in the key operating mode. Modern trends in the use of voltage and current inverters are considered. It is shown that the use of new semiconductor devices made it possible to fundamentally change the topology of the power circuit and the principles of inverter control. The approach of most manufacturers to the topology of autonomous inverters in frequency converters is considered. The most advanced structures (matrix and hybrid) of AC converters, which are produced by modern industry, are considered. Based on the analysis, it is set that high-precision, reliable and noise-resistant digital sensors are widely used in DC and AC electric drive systems – absolute and incremental encoders, as well as optoelectric attached sensors for registering distances, angles of rotation or the number of turns – resolvers. They are used together with numerical control systems, drives and position determination devices. The power supply circuit for synchronous electric motors of the main drive of the rolling stand of a thick plate mill 3000 based on ALPSA VDM 7000 converters from ALSTOM (Converteam) is considered. The main task of control system of the converter network part is to regulate the voltage of the DC link. The block diagram of the control system for the rectifier and inverter parts of the VD 7000 converters is given .Item Types and prospects of non-traditional and renewable energy sources in Ukraine.(СНУ ім. В. Даля, 2025) Brozhko, R. М.; Брожко, Р. М.The article analyzes the current issues of the development of the alternative energy sector of Ukraine and possible further prospects of this sector, because in the context of European integration processes, significant attention is paid to the issues of the country's energy independence, taking into account the ecological purity and inexhaustibility of renewable energy sources. It is proved that the development of renewable energy will be an important step capable of improving the trade balance, creating new jobs, solving social issues, reducing dependence on natural gas imports, ensuring the country's energy independence and increasing the competitiveness of products in both domestic and foreign markets. It is proven that dependence on mineral extraction and outdated infrastructure have become a guarantee of the use of renewable energy sources, because boiler houses, diesel engines and coal-fired power plants emit small particles into the air that settle in the lungs and can cause serious diseases. It is noted that in order to strengthen the country's energy security, it is important for the state to make a choice between continuing to finance imported energy sources or developing the use of its own renewable energy sources, which will make it possible to reduce the cost of "green" electricity compared to thermal and even nuclear power plants. Global processes in the modern world, the growth of world industrial production, lead to a significant increase in energy consumption and, as a result, significant environmental damage to the world environment. In recent years, this problem has become increasingly of concern to the world community, since a person needs the cleanest possible environment for his life. Therefore, at the moment there are reasons to consider environmental problems as one of the most important for ensuring the future sustainable development of humanity, it is these problems that pose the greatest threat to the world community. In this paper, we discuss relevant background information on some unusual, yet renewable energy sources. We examine their current and potential uses, operational limitations, advantages and disadvantages, and the potential capacity of each fuel source for energy generation and fuel savings. The quantitative section analyzes the amount of power that unusual renewable energy sources can provide, according to the generation methods. In a separate section, we analyze the potential fuel savings through direct application in some industries. We explore these values with the help of several examples and show a financial analysis of selected alternative fuel projects. Finally, an overall analysis presents unusual alternative renewable energy sources and concludes that there is a great potential for fuel and cost savings, as well as for environmental protection.