Scientific Journal of KubSAU

The article shows that to improve the performance of autonomous systems we need new methods and principles of their design, associated with both the use of renewable sources and the application of new technical solutions of electromechanical generators and static stabilizers and inverters electric power settings. We have disclosed modern requirements for generators of electric power, as well as features of calculating the parameters of contactless electrical power generators: asynchronous generators capacitive excitation and asynchronous generators with permanent magnets. The article presents some analytical expressions for calculating the electrical losses and the efficiency of the generators, specific weight and power. It is shown, that expedient to designing contactless electrical power generators to carry out as part of the autonomous electricity supply systems, as it is sometimes advantageous to understate the main criteria of efficiency of generators, in order to improve, for example, weight and overall dimensions of static converters. The conclusion is made that in order to improve the efficiency of designing contactless electrical power generators in the early stages of designing it is necessary to carry out a preliminary assessment of the main criteria of efficiency of contactless electrical machines. We have also discussed analytical expressions, which might be used for preliminary evaluation of application features for various types of contactless generators in the stand-alone electricity supply systems taking into account the conditions of use

The article shows the main advantages and disadvantages of renewable energy sources. It is shown, that in general, the use of renewable energy in the world has acquired real momentum and stable growth trend. An interesting fact is that the greatest application was currently the most mutable and unstable form of energy - wind. The total global installed capacity of large wind turbines, according to various estimates, is approximately 20 GW. This is because the specific investment in wind power is lower than with most other forms of renewable energy. The article presents features of the design and operation of modern wind power stations. It is shown that when choosing wind power plants and stations we must take into account the following main parameters and factors: the average value of amount of electricity consumed by power consumers on a monthly basis; power generator; uptime in the absence wind or when weak wind. The study shows block-circuit solutions of different options of energy systems made using wind power plants. We have also disclosed prospects of development wind energy and considered the advantages and the features of the choice of the main functional units of wind power stations which will increase the effectiveness of predesign work on the creation of high-performance systems of electrosupply with combined power supply systems based on renewable energy sources

Currently one of the promising areas to significantly improve efficiency of energy saving is the introduction of renewable sources of energy into the energy system. In the field of solar energy, we consider solar photovoltaic power plants with direct conversion of solar radiation into electricity using solar panels as the most promising ones. The article examines the main factors that reveal the prospects of applying solar photovoltaic power plants. It also discusses the main advantages and disadvantages in comparison with traditional and other renewable energy sources. To improve the operational and technical characteristics of solar power plants in their structure significantly, it is proposed to use new components. Stand-alone inverters for single-phase transformers with rotating magnetic field will reduce the number of power electronic devices in the conversion circuit; they will simplify the system of control and protection, reduce electromagnetic interference and improve overall efficiency and reliability of the converter of the solar power plant. In addition, the modular design of solar power plants will also increase the reliability of the power system due to redundancy of the major functional elements. It is also important that the construction of solar power plants in a modular way enhances maintainability of the system, it significantly reduces the time for maintenance and troubleshooting in emergencies; it simplifies the task of changing its structure depending on requirements of users. The article reveals peculiarities of work and the main benefits from the application of solar photovoltaic power plants