While designing Microgrid control, it's important to make sure that each unit is stable situation. To connect distributed generation units with loads and the utility grid, microgrids use inverters. Due to the variety of energy sources high-reliability inverters and converters are required to provide regulated power to customers and facilitate microgrid integration. The modelling, control design, and stability analysis for two various inverter topologies are considered in this paper. This makes the system less stable. The Bode Plot method is used to study the stability of single and double loop voltage controllers. To make the system more stable, it is suggested to use a controller based on virtual impedance. The simulation results are put into MATLAB/Simulink to check that the theoretical analysis is correct and that the proposed controllers work well.
27.03.2023 Volume 2 Issue 3 View more Download
This article presents the results of a study to determine the magnitude of the effects of radiation factors of uranium production on the environment, namely, to determine the values - the exposure dose rate of gamma radiation - DER, equivalent to the equilibrium volumetric activity of radon - EEVA in the processing and storage of uranium products, specific activity long-lived alpha-nuclides - DAN in atmospheric air, volumetric activity of radon in the air of the working area and the density of radon molasses from soils in areas of underground leaching - uranium UR.
27.03.2023 Volume 2 Issue 3 View more Download
This article presents the results of a study to determine the radionuclides of the uranium decay chain in samples of uranium production and ways to reduce their impact on the environment, namely the values of the specific activity of radionuclides 234U, 230Th, 226Ra, 222Rn, 218Bi, 214Po, etc. taken from uranium waste tailings, off-balance uranium ore dumps and underground uranium leaching sites
26.03.2023 Volume 2 Issue 3 View more Download
This article describes the procedure for calculating the demolition of ammunition depending on the wind speed in the conditions of its discharge from a hovering aircraft. Calculation formulas for calculating the drift of cargo in the presence of a crosswind are given, without taking into account and taking into account the force of air resistance. A linear dependence of the load drift on the factors affecting it, as well as its own characteristics, is derived. The results of the study make it possible to make the necessary adjustments in the practical delivery of goods, which will have a positive impact on the accuracy of the cargo drop.
26.03.2023 Volume 2 Issue 3 View more Download
This article presents the theoretical and legal foundations for improving financial monitoring in commercial banks. It was divided into general criteria for national banking supervision systems in a macro and micro approach. In addition, the types of banking internal control in banks and its organization were considered. The state of implementation of prudential standards by commercial banks in the coming years was also analyzed and appropriate conclusions were given.
26.03.2023 Volume 2 Issue 3 View more Download
This article talks about the pyrolysis process and its mode of operation, as well as newly synthesized substances. The thermal stability of the obtained substances was analyzed. The structure of the pyrolysis apparatus and the main steps performed in it are shown.
26.03.2023 Volume 2 Issue 3 View more Download
This article analyzes the concepts of benchmarking and calibration of measuring instruments. The current regulatory documents and analysis of terminological definitions of measurements in accordance with state standards are presented. For the purposes of harmonization, this term was compared with the definition in international standards. The article presents the main terminological, methodological and algorithmic rules of the benchmarking and calibration procedure.
24.03.2023 Volume 2 Issue 3 View more Download
The paper presents the results of a practical experiment conducted at JSC “VNIIRA”, which refutes the position of the special theory of relativity (STR), according to which moving clocks, due to their movement, in all cases, according to observations, go slower than stationary ones. An experimental fact, established experimentally, is that the clock moving towards the observer, according to observations, goes faster than his stationary clock. STR contradicts this experimental fact. The probability that the STR formula, which expresses the slowing down of the time of a moving clock, is unreliable is greater than 0.99999999999744, that is, it is practically equal to one. The hypothesis "STR is an erroneous theory" in accordance with the experiment is practically reliable. It has been experimentally proven that when observing the astronauts of a spacecraft moving towards the observer, their movements and speech will be observed accelerated by 1/(1-v_exp⁄c)times, where v_ист and c are the speed of the spacecraft and the speed of light, respectively. STR predicts that in this case the astronauts' movements will be observed slowed down by 1/√(1-(v_exp⁄c)^2 )times, thus STR predictions contradict the experimental data. The experiment was carried out using the Avrora-2 monopulse secondary surveillance radar manufactured by JSC “VNIIRA”, which provides high-precision measurement of the time intervals between the moments of transmitting a request and receiving response signals from aircraft transponders. The practical value of this work lies in the fact that its results will help scientists of technical sciences, as well as specialists developing aviation and space technology, to avoid theoretical errors, and it is also possible to avoid accidents and disasters in aviation and space technology associated with the use of erroneous STR formulas. The paper presents reliable formulas that need to be used instead of the corresponding erroneous STR formulas.
24.03.2023 Volume 2 Issue 3 View more Download
SCIENCE & INNOVATION