Industrial electrotechnical devices, using microwave energy, may consist of several magnetron generators. Packaged magnetrons are often used in microwave energy distributed supply systems. Creating a power supply system for such magnetron group is an exceptional task due to the packaged magnetron features, the technological variation of their parameters and the need to adapt to the general operation mode. The possibility of building a centralized power system using booster elements is considered as an individual power source alternative.

Low power magnetrons (up to 1000 W) are widely used in microwave ovens and in industrial electrotechnical installations with distributed supply of microwave energy. To calculate and optimize the parameters of magnetron supply sources, a model that allows presenting magnetron as an element of electrical system is needed. At present, simple magnetron models are known. They are designed to calculate power supply systems solely in steady state. The article proposes the model of a magnetron in the form of a four-terminal network with variable parameters. Such model facilitates investigation of static and dynamic characteristics in various power supply circuits.

Magnetron generators with different systems of magnetic field creation are used during industrial microwave devices construction. Technical and economic parameters of the generators are largely depended by the power supply source characteristics. Therefore, during the development stage of the power supply source it needs to have a model for studying of electromagnetic processes in the power supply source of magnetron generator under different circuit parameters. A simulation model of the 3 kW power supply packaged magnetron is built in MATLAB/SIMULINK. The simulation results characterize the mains voltage influence to the operating mode of the magnetron generator.

The technological installations’ characteristics are possible to improve by equipping fans with a frequency-controlled electric drive. However, it can lead to an electromagnetic compatibility problem in the electrical supply system. This problem becomes worse if a large number of fans are included in the technological installation and the electric drives are powered from a substation connected to a limited power source. As an example, in this article we investigate the power supply system of a gas cooling unit with variable-frequency electric drives for fans. The electric drives’ operating mode dependences characterizing the non-sinusoidal voltages and currents of the power source are obtained with the help of simulation modeling in the MATLAB environment with the Simulink expansion package. The typical substation circuit usage for the power supply of a group of fans with a frequency-controlled drive does not meet the requirements of IEEE Standard 519-2014. We can solve the problem of electromagnetic compatibility by changing the substation topology and organizing DC busbars and replacing frequency converters with inverters. We proposed forming DC busbars using 12-pulse rectifiers powered by transformers with two secondary windings with different connection schemes. The simulation results confirmed that the proposed substation topology provides the voltage and current harmonics level on the substation power busbars in accordance with the IEEE Standard 519-2014 requirements over the entire frequency range of the fans’ motor control.

This article deals with the creation of a power supply system of wireless sensors which take measurements and transmit data at time intervals, the duration of which is considerably less than the activation period of sensors. The specific feature of the power supply system is the combined use of devices based on various physical phenomena. Electrical energy is generated by thermoelectrochemical cells. The temperature gradient on the sides of these cells is created by a vortex tube. A special boost DC/DC converter provides an increase in the output voltage of thermoelectrochemical cells up to the voltage that is necessary to power electronic devices. A supercapacitor is used to store energy in the time intervals between sensor activation. A study of an experimental sample of the power supply system for wireless sensors was conducted. Using the model in MATLAB + Simulink program, the possibility and conditions for creating the considered system for a particular type of wireless sensor were shown.

Contemporary electrotechnological devices are sources of deforming influence to voltage wave. In our report that influence is analyzed, methods and technical solution for voltagepsilas decrease are offered.