Renewable energy utilization in the distribution network is increasing globally to tackle problems of traditional power production and transmission networks. By combining renewable energy sources with battery systems, the sustainability of the power system can be achieved while increasing its reliability. Purpose: nonlinear and unbalanced three-phase loads require specialized techniques to maintain their operation without compromising power system efficiency. Methods: a sustainable autonomous power supply system that utilizes a four-leg three-level inverter is proposed to operate such loads under difficult situations. Moreover, the operation of the integrated battery system is maintained by a fuzzy management controller that corresponds to the power mismatch between generation and demand.
A user experience-based design has been followed in formulating the fuzzy system rules, while the output of the fuzzy management system represents the reference values for the battery current controller. This prompted the flexibility of the proposed management system for being implemented on different integrated units or under different operating conditions with minimal change. Furthermore, a combination of proportional resonant controllers and current controllers has been employed in regulating the load-connected inverter. This is to ensure the stability of the inverter and the achievement of the operational goals. Then, a special type of PWM generator has been used to generate the switching pattern of the proposed inverter's internal transistors. Results: the design has been tested in a simulation scenario under difficult conditions of generated power fluctuations and demand extreme nonlinearity and asymmetricity. However, the results indicated the effectiveness of the proposed inverter and management system in maintaining the stability and reliability of the power system.

Keywords: Fuzzy logic control, Energy management, photovoltaic system, autonomous power supply APS, unbalanced loads, Proportional resonate controller.

Haider M. Jassim (Yekaterinburg, Russian Federation) – Graduate Student of the Department “Electric Drive and Automation of Industrial Installations” of the Ural Energy Institute Ural Federal University named after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russian Federation (620002, Yekaterinburg, 19, str. Mira, e-mail: khdzhassim@urfu.ru).

Anatoly M. Zyuzev (Yekaterinburg, Russian Federation) – Doctor of Technical Sciences, Associate Professor of the Department of “Electric Drive and Automation of Industrial Installations” Ural Energy Institute Ural Federal University named after the first President of Russia B.N. Yeltsin (620002, Yekaterinburg, 19, Mira str., e-mail: a.m.zyuzev@urfu.ru).

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The article deals with eddy-current (electrodynamic) separators with a traveling magnetic field based on linear inductors. Such separators have high performance and easily fit into finished production lines. They are effective in extracting non-ferrous metals from various types of bulk materials (automobile scrap, mixed industrial and municipal waste, cable and electronic scrap, etc.). Separators are also used for sorting non-ferrous metal scrap in preparation for metallurgical processes. This article focuses on the eddy-current separator, which is based on a conveyor that moves the processed materials, and a three-phase linear inductor located under the conveyor belt. The purpose of the study: improvement of mathematical models and methods for calculating eddy-current separators based on linear induction machines. Results: the proposed method for calculating the physical processes in the separator includes two stages. At the first stage, the calculation of the electromagnetic forces acting on the particles of non-ferrous metals is carried out, according to the methodology developed in Ural Federal University. At the second stage, the trajectories of movement of the separated particles in the working area of the separator are calculated taking into account the combined action of electromagnetic and mechanical forces. At the same time, it is proposed to divide the working separation zone into sections of small sizes. Within such sections, the forces are assumed to be unchanged. The article presents polynomial dependences of electromagnetic forces on the speed of particles and their location above the inductor. Such dependencies allow, in the course of calculations, to correct the forces during the transition from section to section according to the calculated values of the speed and coordinates of the particle. Examples of calculating the trajectories of conductive particles in the working area of ​​an eddy-current separator are presented. The results of the trajectory calculation make it possible to evaluate the results of separation at the stage of plant design.

Keywords: eddy-current separation, linear inductors, electromagnetic forces, mechanical forces, particle trajectories, mathematical model, calculation results.

Andrey Yu. Konyaev (Ekaterinburg, Russian Federation) – Doctor of Technical Sciences, Professor, Professor of the Department of Electrical Engineering of the Urals Federal University named after the first President of Russia B.N. Yeltsin (620002, Ekaterinburg, 19, Mira str., e-mail: a.u.konyaev@urfu.ru).

Mikhail E. Zyazev (Ekaterinburg, Russian Federation) – Graduate Student Department of Electrical Engineering of the Urals Federal University named after the first President of Russia B.N. Yeltsin (620002, Ekaterinburg, 19, Mira str., e-mail: zyacho72@gmail.com).

Anastasia O. Ilinskaya (Ekaterinburg, Russian Federation) – Master Student of the Department of Electrical Engineering of the Urals Federal University named after the first President of Russia B.N. Yeltsin (620002, Ekaterinburg, 19, Mira str., e-mail: nastya.ilnskaya@mail.ru).

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The use of ground-based buffer energy storage devices in the contact network of electric transport leads to a change in the structure and volume of energy flows from sources to consuming electrical equipment. The aim of the work was to study the changes in energy flows during the installation of such storage devices. Methods: to solve this problem in the tram transport operation power supply system, the flows of regenerative energy of rolling stock were studied by directly measuring the energy flows from sources – traction substation and recuperating wagons, as well as the volumes of energy consumption for traction by rolling stock and the redirected energy of excessive recovery of a stationary flywheel-type energy storage. Results: in the course of research, the presence of intra- and inter-feeder flows of useful recovery was revealed. since the same amount of transport work of electric transport rolling stock requires the same amount of energy consumption, to confirm the results obtained, a comparison of these flows was carried out for the power supply sections of transport work of two traction substations with equal mileage of wagons, but with different intensity of movement of rolling stock. In the course of this comparison, it was established that the distribution of recovery flows in the contact network along the inter-feeder and intra-feeder channels depends on the intensity of movement of rolling stock and the number of isolated power sections at the traction substation. A method was derived for determining the volume of intra-feeder flows of recovery energy based on the measured indicators of the volumes of power supply from the traction substation, inter-feeder flows of recovery energy, the mileage of wagons along the sections of this substation and the total energy consumption of the entire tram route system during the study period. There was also a study of changes in the volume and direction of recovery flows during operation in the contact network of the traction substation of the ground-based flywheel energy storage unit NKE-3G. As a result, it was found that the connection of a stationary storage device, in addition to increasing the useful energy recovery in the contact network, also leads to a change in the structure of its flows. Practical significance: the basic regularities have been established in the methods of determining the ratios of the recovery energy volumes with the amount of energy consumption of wagons for traction in the sections of the traction substation under study with an energy storage device to that ratio in the sections of the same substation without a storage device, as well as at a control substation with an equal mileage of rolling stock. With other similar conditions of transport operation, the ground storage allows you to increase the amount of useful use of recovery energy by almost a third.

Keywords: regenerative braking, inter-feeder and intra-feeder flows of regenerative energy, useful and excess recovery energy, stationary storage, contact network, traction substation, rolling stock, traction load, non-traction load, redirection of excess recovery.

Alexander V. Katsay (Moscow, Russian Federation) – Candidate of Philosophical Sciences, General Director of Kinemak LLC (11520113, Moscow, Kashirsky Proezd, e-mail: proton764@mail.ru ).

Maxim V. Shevlyugin (Moscow, Russian Federation) – Doctor of Technical Sciences, Associate Professor, Head of the Department "Electric Power Engineering of Transport" RUT (MIIT) (127994, GSP-4, Moscow, Obraztsova str., 9, p. 9, e-mail: mx_sh@mail.ru ).

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The article describes a project to create an electric transmission for ground vehicles. As a layout, a motor-wheel variant is proposed, in which a traction electric motor, power electronics, control system and brake system are integrated into the wheel disk. This arrangement of the traction motor allows you to free up the space of the car for comfort and placement of the electric power storage.
A combined excitation machine is proposed as an electric motor, the magnetic flux in which is created simultaneously by permanent magnets and an excitation winding. Permanent magnets allow you to increase the power in the limited dimensions of the disk, and the excitation winding allows you to adjust the magnetic flux, which significantly expands the range of speeds and torques of the vehicle. The design of the electric motor is innovative and protected by a patent of the Russian Federation. Рurpose: to develop motor wheels of the proposed type, the goal was set to create a design system. Methods: the project system is a set of programs that consists of two parts: a synthesis system and an analysis system. The synthesis system generates the optimal geometry of the electric motor for a specific technical task of the customer. It contains a multi-level structure that allows you to implement developments for various project situations with and without restrictions. The system contains 7 such levels. Optimality criteria can be selected depending on the requirements of the project. The analysis system is built on the principle of a digital double. Its methodological basis is the finite element method. The system allows you to conduct a detailed analysis of the electromagnetic and thermal state, to obtain all the necessary integral characteristics. Results: the main result of the conducted research is the possibility, based on the created software package, to develop motor-wheel designs with different power for vehicles of various types. The design system allows the developer to go the distance from the technical task to the stage of development of design documentation with minimal technical risks at one workplace in an automated man-machine mode. The project system was used in a specific project. With the help of it, a mock-up model of a motor wheel for a racing electric car was developed for participation in International competitions "Formula Student". The design of the mock-up sample and the results of its tests are presented. The operability of the design system has been tested on a digital analogue of a real race track, which is divided into sections with specified speed modes.  The program outputs 15 parameters of both the car and the electric motor. Practical significance: the developed software package is a very convenient engineering tool that greatly facilitates the initial complex stage of development, which is associated with electromagnetic calculations of the traction motor. The flexibility of the design system allows you to implement almost any technical task with a large number of restrictions. Digital models of the analysis system mitigate technical risks before the production of a mock-up and prototype. The volume of design tests is reduced, since some of them can be carried out on a digital model. The design system for the development of motor wheels based on a brushless motor of combined excitation can be applied in the design departments of electrical engineering enterprises. Discussion: the development of electrical engineering is steadily following the path of the so-called "end-to-end design", in which, on the one hand, the number of engineering personnel is reduced when developing a new product with an increase in the functional role of each engineer, on the other hand, the volume of accompanying paper documentation is reduced. In the future, the technological chain will be reduced to links digital calculation model-digital design model-digital prototype manufacturing. It is clear that the implementation of this technology is a long and complex process, but already now the software tools being developed should take into account this trend. In the proposed scientific work, such an attempt is made.

Keywords: motor-wheel, valve electric motor, combined excitation, design system, multilevel optimization, electromagnetic analysis, thermal analysis, digital twin

Ivan A. Chuiduk (Chelyabinsk, Russian Federation) – Graduate Student of the Department of Electric Drive, Mechatronics and Electromechanics of the South Ural State University, e-mail: ivan957495@bk.ru

Dmitry S. Gandzha (Moscow, Russian Federation) – Candidate of the South Ural State University, Head of the Marketing Department of JSC "Gardtex", e-mail: medvedy82@mail.ru

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The choice of devices for converting changes in physical quantities into modulated signals for their transmission via a communication channel to Earth is an important part of the development process of telemetry systems used in testing manned and unmanned aerial vehicles (UAVs). This choice is based on Kotelnikov's theorem, which determines the number of reference discrete values of the measured quantity. However, it is difficult to transmit the entire range of these possible values. To simplify the transmission of discrete signal values over long distances, they are quantized by level, when a continuous scale of values is replaced by a uniform discrete scale. But the simplification of the signal transmission task is achieved at the cost of increasing distortion (information loss) due to the appearance of quantization noise. One way to solve this problem is to use an encoding function consisting of binary code groups. Purpose: to develop a mathematical model of measuring and coding devices (MCD) during testing of UAVs. Methods: creation of a method for reducing information loss in coding schemes with an information extrapolator and feedback on quantization error by simultaneously calculating two parameters – the transmission rate of discrete symbols of the original sample and the quantization frequency – based on the evaluation of the influence of noise. Results: based on the proposed method with pelinomial prediction of information and the use of statistical regression, an MCD model is constructed that allows increasing the volume of predicted information by 1,5 times due to additional measurements from the gyroscopic sensor of the UAV course system. During the testing interval, the average forecast error for measurements at the 31st point for the Gaussian distribution was 5,3 %. The definition of the coding function in the form of an extrapolator of the mathematical expectation of information made it possible to move from the approximation of the function of on-board measurements to difference equations, which improved information indicators compared to the classical approach. The idea of the experiments was to simulate six different types of modulation in the case of Gaussian signals. Quantitative estimates have shown that in the range of values of the ratio of the MCD bandwidth to the quantization frequency of more than 12, the four most common types of MCD provide close values of information loss up to 0,03 bits. Practicalrelevance: the results of the research were used in the creation of a measuring and coding test subsystem of on-board UAV equipment. It allows you to significantly reduce the loss of information due to quantization noise.

Keywords: mathematical model, measuring and coding device, extrapolator, maximum information principle, modulation, quantization noise, dispersion, entropy, telemetry system.

Vyacheslav V. Kupriyanov (Moscow, Russian Federation) – Doctor of Technical Sciences, Professor National University of Science and Technology “MISiS”, National University of Science and Technology “MISiS” (119049, Moscow, 4, Leninsky pr., e-mail: v_v_kupriyanov@mail.ru).

Inna S. Bondarenko (Moscow, Russian Federation) – Ph. D in Technical Sciences, Associate Professor National University of Science and Technology “MISiS” (119049, Moscow, 4, Leninsky pr., e-mail: innabondarenko@gmail.com).

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The development of new types of mathematical models and methods of their construction is an urgent scientific task. Regression analysis methods are actively used to build mathematical models of statistical type. An adequate regression model allows not only to predict the values of the dependent variable, but also to explain the mechanism of influence of input variables on the output, which increases the effectiveness of management decisions. Previously, the authors proposed modular linear regression models, but an algorithm for their accurate estimation was not invented. The aim of the study is to reduce the problem of accurate estimation of modular linear regression models using the least absolute deviations method to the mixed-integer 0-1 linear programming problem. Results: in this paper, in order to solve the problem of estimating a modular regression model using the least absolute deviations, an algorithm is proposed according to which it is required to solve a series of mixed-integer 0-1 linear programming problems and choose from the solutions obtained one in which the sum of the modules of the residuals is minimal. The proposed approach was applied to the simulation of freight rail transport in the Zabaikalsky kray. The constructed modular regression in terms of the sum of the modules of the residuals turned out to be more than 3 times better than the traditional linear regression estimated using the least absolute deviations. The interpretation of modular regression is given. Practical significance: the proposed method of accurate estimation using the least absolute deviations of modular linear regressions can be used to solve specific applied problems of data analysis from any subject areas, which involves the development of appropriate software. Modular regressions are more suitable for modeling processes or phenomena with variable directions of influence of input variables on output.

Keywords: regression model, modular regression, least absolute deviations, mixed-integer 0-1 linear programming, shipment, export.

Mikhail P. Bazilevskiy (Irkutsk, Russian Federation) – Ph. D. in Technical Sciences, Associate Professor Department of Mathematics Irkutsk State Transport University (664074, Irkutsk, 15, Chernyshevsky str., e-mail: mik2178@yandex.ru).

Ayana B. Oydopova (Irkutsk, Russian Federation) – Graduate Student in the direction of 1.2.2 «Mathematical modeling, numerical methods and software packages» of Irkutsk State Transport University (664074, Irkutsk, 15, Chernyshevsky str., e-mail: aoydopova11@mail.ru).

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Access control management to the information assets is one of the most important parts of cybersecurity. This problem in one form or another should be solved both as a whole at the level of entire IT-infrastructure of a company or organization, and in each local information system. This article describes the process of access management to information assets based on the concept of zero trust. “Zero trust” concept meets the requirements of applications, users and devices in fast and secure access to data in distributed architectures. Purpose: to develop an effective model of access management and to describe it in a form of formalized model. Results: development on existing approaches base of аn access control management model, which allows to implement access control processes in a distributed IT infrastructure. A distinguishing feature of the proposed model is offering an algorithm of dynamic security policies determination which takes into account an access of subjects with different level of privileges. The model takes into account few conditional levels of remote access – access of company’s clients, employees and contractors. Given a complex and distributed character of modern information infrastructures of organizations, the model implies the existence of a significant number of access points with automated workstations within the infrastructure, remote workstations, various personal and mobile devices, as well as specific devices such as trading terminals, to name just a few. An effective access control should provide the possibility of centralized access to information assets for all users. It implies the use of a single entry point built on the basis of access models from the concept of “zero trust”. Practical relevance: the results of the research can be used in development of architecture for remote user access to distributed information assets and organizing access control and management processes based on dynamic determination of the trust level of access subjects, which, in general, improves the security of organizations.

Keywords: cybersecurity, access management, zero trust.

Pavel A. Ivanov (Moscow, Russian Federation) – Graduate Student of the Department of Information Security. Financial University under the Government of the Russian Federation, Moscow, e-mail: 218666@edu.fa.ru

Igor V. Kapger (Perm, Russian Federation) – Ph. D of Technical Sciences, Associate Professor of the Department of Automation and Telemechanics Perm National Research Polytechnic University (614990, Perm, 29, Komsomolsky pr., e-mail: kapger@mail.ru).

Andrey S. Shaburov (Perm, Russian Federation) – Ph. D of Technical Sciences, Associate Professor of the Department of Automation and Telemechanics Perm National Research Polytechnic University (614990, Perm, 29, Komsomolsky pr., e-mail: shans@at.pstu.ru).

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Under pandemic conditions, departmental canine services experience significant difficulties in feeding service dogs. The article presents the results of the study of existing dog feeding systems and describes the development of an automated system using Omron programmable logic controller (PLC) that meets the requirements of the normative documents of cynological services. The developed technological scheme with the selection and marking of the equipment is given. To simplify installation, the equipment is divided into modules. Provides a table of signal addresses used in Omron series industrial controllers. A system of logical equations for controlling the main drive modules of the equipment devices is given. Purpose: development of a project for an automated dog feeding system in the kennels of the Russian Federal Penitentiary Service based on programmable logic controllers and reducing the use of human resources. Materials and methods: the methodology of feeding service dogs agreed with the Orders of the Russian Federal Penitentiary Service No. 330 of May 13, 2008, No. 570 of July 4, 2018. Finite automata theory, theory of synthesis of logical equations and ladder diagrams methodology were used. The software was developed using CX-One. Dry pelleted dog food is proposed to be used as food. Results: a project of an automated system for 5 dogs was developed, including the selection of technological equipment. The system was tested in software simulation mode. Practical relevance: the introduction of this system in departmental organizations will reduce the time spent on dosing the food, reduce the likelihood of error due to human error, as well as in a pandemic to ensure the process of feeding service dogs while reducing the labor costs of service personnel.

Keywords: automated system, dog feeding process, PLC.

Sergey N. Kostarev (Perm, Russian Federation) – Doctor of Technical Sciences, Professor of the Department of "Information technologies and automated systems" of Perm National Research Polytechnic University (614990, Perm, 29, Komsomolsky pr.,); professor of the Department of Computer Machines, Complexes, Systems and Networks of Perm Military Institute of National Guard Troops of the Russian Federation
(614030, Perm, 1, Gremyachiy Log, e-mail: iums@dom.raid.ru).

Natalia V. Startseva (Perm, Russian Federation) – Candidate of Agricultural Sciences, lecturer of the Department of Zootechnics of the Perm Institute of the Federal Penitentiary Service of Russia (614012, Perm, 125, Karpinskogo str., e-mail: startsieva.1974@mail.ru).

Tatyana G. Sereda (Perm, Russian Federation) – Doctor of Technical Sciences, Professor of the Construction Technology Department Perm State Agrarian and Technological University named after D.N. Pryanishnikov (614990, Perm, 23, Petropavlovskaja str.).

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Energy-efficient planning of any mission performed by a UAV is the most important task. At the same time, in order to achieve high energy efficiency of the UAV, it is necessary to identify and minimize the energy consumption of those functional operations of the UAV that consume the most energy. In the absence of accurate information about the required energy to complete the mission, it is impossible to suggest the necessary duration of the flight and the efficiency of such a flight will be low. To date, some models of UAV energy consumption have been proposed when performing various flight maneuvers. However, the task of optimizing vertical group flights of drones has not yet been considered. Goal. The purpose of the study is to analyze the possibility of optimizing group drone flights in vertical flight mode. The possibility of optimizing the group vertical flight of the UAV is analyzed. Methods: A group of UAVs in vertical flight mode is considered, where the average power of drones is a linearly ordered sequence. The optimal type of the newly introduced functional dependence of the flight altitude on the average power of the UAV is investigated, if there is a limit on the amount of heights reached by the group members. Results: The optimization problem of calculating the optimal type of the specified functional dependence is solved, in which the average sum value of the flight times of all UAVs in the group reaches an extremum. A condition is obtained under which the desired average value of the flight time reaches a maximum, which can be interpreted as the worst mode of conducting group vertical flights. Practical significance. The practical significance of the result obtained lies in the possibility of avoiding the worst mode of total energy consumption by a group of drones performing vertical flight by more rational distribution of drone power at the required heights of the rise.

Keywords: unmanned aerial vehicle (UAV), group flights, optimization, altitude, power.

Gasan Ahmed oglu Huseynov (Baku, Republic of Azerbaijan) – Doctor of Technical Sciences, Professor, Professor-Consultant of the Department of Mechanical Engineering Technology of the Azerbaijan Technical University (AZ1073, Azerbaijan, Baku, 25, Huseyn Javid ave., e-mail: tk.xt2001@mail.kg).

Peri Rasim gyzy Zulfugarli (Baku, Republic of Azerbaijan) – Assistant of the Department of Radio Engineering of the Azerbaijan Technical University (AZ1073, Azerbaijan, Baku, 25, Hussein Javid ave., e-mail: peri.rzayeva30@gmail.com).

Irada Hamid gyzy Abdurrahmanova (Baku, Republic of Azerbaijan) – Ph. D. in Technical Sciences, Head of Department of the Scientific Research Institute of Aerospace Informatics (AZ1145, Baku, 1, S.S. Akhundov str.,
e-mail: abdurraxmanovairada@mail.ru).

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