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This paper presents results of the initial research into application of microwave techniques for measuring the moisture content in wood biomass. The goal of the research was to develop a control system for continuous monitoring of moisture control during the manufacturing process. We propose using a closed, low-energy microwave circuit, through a rectangular flow-through chamber with a unique profile...
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In the paper, mathematical models for determination of resistivity of thin antistatic coatings are presented. The models are combination of the classic four-point method and the method of images. Models 2D and 3D are taken into considerations. In both cases are analyzed the parameters of measuring system and coating layer for example: the relations between the sample size and the distance between...
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In this article hyperthermia therapy of tumors by electromagnetic field in radio-frequency range is described. Electromagnetic fields are used to generate temperature distribution inside the tumor and in surrounding tissues. First equations allowing calculation of the magnetic field within human body in terms of magnetic vector potential A and under sinusoidal steady state are derived. Next Pennes...
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Inductive Energy Transfer systems (IET) are becoming commonplace in electrical and electronics equipment. Increased growth of interest in electric vehicles EV and renewable energy sources, significantly changed the approach to vehicle. EV battery pack is no longer just a vehicle for the drive tank, but it is also a distributed storage for energy from the power grid. To ensure the automation of the...
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The paper presents a description of switching energy losses in high-voltage MOSFET operating in a bridge topology. Energy losses in both hard and soft switching, as well as during switching on at light load current and in unloaded operation have been analyzed. The description has accounted for the effect of parasitic junction capacitances and the external capacitances of semiconductor elements, as...
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In contrast to the generally used methods, software only solution of the controller for balancing of current distribution in multi-channel (interleaved) converters is proposed in the work. No additional measuring devices, e.g. current transducers, are necessary for proper operation of the converter. The controller constitutes part of a control system of wide-band power electronics current or voltage...
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This paper presents an influence of magnetic core on measurements of frequency characteristics for 2 reference coils. Authors presents 2 measurement setups: in frequency and time domain. Performed measurements allow to conclude visible effect of the magnetic core to the frequency up to 300 kHz, which must be taken into account when modeling the transformers for the diagnosis of FRA.
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In this paper the selection of parameters of single-phase shunt active power filter (APF) was described. The considered APF was controlled with using p-q algorithm. The purpose of the filter is to eliminate the harmonics of current source and power factor correction. The model of the APF with follower PI controller of compensation current, PI DC-link voltage controller and with additional passive...
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The paper contains selected results of research related to a neural model of development of the electric power system from the unmanned factories perspective in the MATLAB environment. For the purpose of an experiment that involved designing and testing the neural model of the system, numerical data for the years 1946 to 2009 are used, which comprise nine input and five output variables. In order...
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In this paper the commutation mechanism based on LV mechanical circuit breaker and parallel semiconductor device is discussed. This hybrid switch comprises electromechanical relay connected in parallel with semiconductor branch controlled by microprocessor unit. The work presented herein covers both laboratory experiments as well as EMTP-ATP simulations, where modeling of electric arc behavior was...
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Due to the high variability of energy consumption over time and the impossibility of its long-term storage, an important issue is the selection of appropriate precise tools for forecasting. The article describes the dynamic modelling and the results of predictive dynamic models developed for a group of individual customers. The results were evaluated on the basis of real data about consumption of...
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The paper presents a new concept of constructing an electric machine based on repetitive electromechanical modules. A dedicated method for magnetic field analysis with the use of a three-dimensional Ansys Maxwell software package is employed.
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Power electronic converters, next to PV panels, are an important element of PV systems. They are responsible for converting electrical energy parameters such as: voltage, current and frequency values. This paper presents a detail performance analyze and simulation studies of small photovoltaic energy system. The proposed system consist: a step-up converter fed from the PV array, a high-frequency transformer,...
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In this paper a single phase grid-connected photovoltaic converter with maximum power point tracking algorithm is presented. This system is characterized by high efficiency and good output quality parameters of electrical energy. The implemented inverter operates in current tracking controller mode. The output current (current of grid) is almost sinusoidal and the reactive power is equal to zero....
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This paper presents a study of the GaN HEMT switching features conducted with the use of the half-bridge test converter rated at 2,5 kW. Results of simulation performed in LTSpice are verified by a series of experimental tests at the variable input voltage (up to 400 V) and switching frequency (up to 250 kHz). Three switch scenarios were analyzed: HEMT without the anti-parallel diode, HEMT with an...
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Silicone gels are gaining popularity as insulating materials in electrical applications, owing among others, to their good thermal stability, high elasticity, easy processing and good dielectric properties. In this paper results of dielectric strength measurements performed for a commercially available insulating RTV-2 silicone gel are discussed. Test cells with IEC-60243 compliant parallel plate...
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In this article authors briefly describe the concept and an exemplary implementation of a scalable vision understanding system. In the practical implementation a popular humanoid robot NAO is being used. The robot's video processing algorithm is capable of connecting to a remote computational resource (server or cluster) for running more sophisticated image understanding algorithms. The novelty of...
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The value of measurand reconstruction based on the result of observation of the output of the measurement path belongs to the so-called ill-conditioned operation. It is so even for the well-known dynamic of the track type linear differential equation. This task is sensitive to any distortion and measuring errors by which generally requires the use of complex mathematical operations. If the measuring...
