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In this paper, controversial views on the use of an integer- and fractional-order derivatives in the theory and practice of electric circuits are discussed. Maxwell's equations are definitely useful in classical circuit analyses but empirical, fractional-order modeling is advocated in specific applications, including an exemplary supercapacitor charging circuit. Thus, both methodologies can be employed...
The paper focuses on the effect of frequency variations on the shape of modeled hysteresis loops. The concept relies on a modification of value of single parameter related to coercive field strength. The considered description is the GRUCAD model. It is a low-dimensional description based on a ordinary differential equation and some auxiliary nonlinear relationships.
In this paper the elaborated structures of the main circuit and control system of a power electronics modified rectifier with current modulation are presented. The input power circuit is based on two classical diode rectifiers. In aim to obtain quasi-sinusoidal input current, the current modulator connected to the DC circuit was implemented. Due to the required minimum fluctuations of resultant output...
The paper presents the method of digital modelling of process of switching on by vacuum switch in capacitive circuits. Currently, there are few descriptions of vacuum switch models used for capacitive circuits switching on. More often researchers focus on vacuum switch models used for switching of the circuits (also previous works of the Authors) and even more often models used for switching of the...
Higher harmonics are particularly important among disturbances of the power quality. Their primary source are nonlinear loads which process the energy of fundamental harmonic on the higher harmonics energy. Such load can be used in the stiffness test of the supply network. An arc furnace is one of more often met industrial nonlinear load. The paper deals with the balanced three-phase circuit of the...
The paper presents results of research on the improvement of parameters of the neural model of system of the Polish Electricity Stock Exchange in the MATLAB and Simulink environment using methods inspired by quantum computer science. The models of the Artificial Neural Network of the taught Electricity Stock Exchange System, including selected elements of quantum computing used to improve the neural...
The following paper contains selected results of research on modeling identification of Polish Electricity Exchange on the example of the dates quoted on the Day Ahead Market. In order to obtain a model of the Polish Electricity Exchange System in the beginning it was conducted to identify data for the period from January, 1 (2013) to December, 31 (2015). In the result discrete parametric model using...
This paper presents the analysis of bidirectional Transient Voltage Suppressor (TVS) application for limitation of the electric arc energy in a low voltage circuit. The study employs both simulations and laboratory experiments, which were conducted to present inductive current breaking procedure with use of a standard switch and a switch with passive arc suppressor connected in parallel. EMTP-ATP...
In this article a mathematical model is proposed of the electric contact comprising two identical coils and contact plates located in a vacuum chamber. For the use of mathematical model an algorithm was created and implemented in Matlab environment. The model was developed, based on combination of nonlinear partial differential equations representing a quasistationary electromagnetic field. In the...
This work presents concept and implementation of a bidirectional coupling between direct-current circuits of significantly different voltage levels using galvanic isolation in the form of a high-frequency transformer. Standard 5-kW/100-kHz compact dual active bridge modules were used for construction of the coupling. Possibilities of modular construction of the system were presented, in which both...
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