In the paper the conception of parallel running of pure active power filter (APF) and hybrid active power filter (HAPF) in 3-phase energetic power system with unbalanced load was presented. Purpose of filters is elimination of source current harmonics and compensation of rea...

The paper presents a mathematical method of determining the energy output of photovoltaics roof tiles on the basis of generally available data. The results obtained were compared with the ones generated by a program sponsored by the European Commission.

The paper presents investigation results concerning the accuracy analysis of calculating electromechanical eigenvalues of the multimachine power system (PS) state matrix based on instantaneous power disturbance waveforms when taking into account introduction of a disturbance to different units. ...

The article presents the development trends of the production and use of photovoltaic materials, tendencies that have been observed for more than ten years. Special attention is paid to the analysis of installed capacities, uses, and the technology of production. The economic...

His study is a description of basic quality parameters of voltage with discussing basic requirements that must be complied with by generator installations connected to electroenergetic networks. The requirements for wind power stations have been particularly included, cooperating wi...

It describes a project supporting element with a permanent magnet, the usable equipment for the transport of ferromagnetic object at greater distances.

This paper deals with the innovation of the electrical engineering education at our department supported by the grant project FRVŠ 378/2011/F1a. It presents our novel approach to implement the modern technology of supercapacitors into power engineering education and describes our...

The mathematical model of flux-switching permanent magnet machine based on Cauchy boundary problem is described. This model takes into account machine geometry and design in detail, enables to simulate starting, slow down and other transient modes, allows for iron and steel losse...

This paper deals with the dimensional and the material optimization of the robot magnetic wheel. A maximum value of the attracting force and the reduction of the weight are demanded. Three calculation techniques were used. The analytical solution shows conversion of the real...

This paper presents a new conceptual project of a transducer using a magnetic fluid and thereby achieves a relatively high performance. Due to magnetic properties of used liquids, resulting forces increase several times.

The paper deals with the influence of the space-varying inductance on transients in the transformer winding. The method for the inductance evaluation respecting the manner of turns layout is presented. Obtained results have been implemented in our algorithm for the numerical anal...

An electromagnetic actuator with a plunger moving in a ferrofluidic liquid is suggested and modeled. The paper analyses its principal operation characteristics.

Many electrical and electronic devices, such as mobile phones, music and movie players, computer mice and laptop computers use batteries, which enable them to operate for many hours without being connected to the power system. The variety of equipment requires a ...

Direct digital synthesis is used in many applications. There is necessary to use a quality source of the clock signal. One of the best circuits for this purpose is Butler oscillator as emitter follower. By this circuit is possible to design a high frequency oscilla...

The paper presents the substrate integrated waveguide applied as a basis of leaky wave antennas. The substrate integrated waveguide structures are extremely useful for integrating the antenna into any system or antenna array. The standard PCB process is applied to fabricate these...

The paper proposes the possibility of metamaterial structure using for the transmission properties of open waveguide probe changing and the possibility of microwave open waveguide sensor tuning with metamaterial structure to be used for nondestructive testing of dielectric materials proper...

The paper presents idea and practical realizations of multiple input transconductance operational amplifier (MIOTA) of hybrid integrated circuit (HIC). There have been presented applications of HIC-MIOTA for analog signal processing systems which are digitally controlled. There are shown the&#x...

This paper presents a model of the first order first order parametric section with non-periodically variable parameter. Those systems are used as parts of more complex parametric filters. A formula, describing filter response to any signal with finite average power, has been ...

The paper deals with two-phase power electronic system with variable orthogonal output for industrial- and transport drives applications. . Modelling and simulation of two-phase power electronic converters with both R-L and motor load is shown in the paper. The simulation models ...

Mathematical simulation of electromagnetic process in circuit of coils electro mechanic control system with switch elements is represented.