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From an electrical point of view dielectric elastomers are variable capacitors, which are frequently used as generators. The focus of this paper is to show, how the maximum energy gain can be realized by realizing an innovative current waveform to charge and discharge the polymer. Several energy harvesting cycles are introduced and their energy output compared. The most promising cycle has been optimized...
Hybrid electrical power sources are one of the future trends in the area of power sources. They can be composed of many interacting components such as electrical generator sets with optimum variable speeds or constants speeds, photovoltaic sources with maximum power tracker, wind power generators, fuel cells and batteries. Hybrid electrical power sources initially developed and produced mainly for...
This paper deals with simulation and experimental verification of DC/DC converter with input active filter. Input filter design is presented and in analysis two different stabilization methods are studied. Offset method is based on stabilization of undesired current values on input choke and it is based on total change of converter switching (unplugging from the power network). Stabilization method...
Constant speed of mobile electrical power sources (EGS) will be soon replaced by optimally controlled variable speed, driving robust permanent magnet generator equipped with power electronics frequency and voltage control. The paper gives short revue of some problems in research and development of optimally variable speed of EGS. The results of modeling and experimental verification EGS with multilevel...
To increase the clean and renewable energy used presently, energy could be extracted from the sea. Here an Archimedes wave swing (AWS) park is proposed to convert the motion of the sea waves into electricity with a capacity of 90 MW. In order to find the most suitable way to connect these devices, various electrical components are used which need to be modeled precisely to carry out the calculations...
This paper describes experimental results obtained from a sliding-mode quantum controller implementation applied to a laboratory setup of a series-resonant converter. The motive for the design of the latter controller has been to achieve maximum operational efficiency. The newly formulated sliding surface indeed assures active minimization of the system energy loss in any arbitrary chosen full power...
Theory, simulation and experimental verification are key issues for successful research and development. Therefore basic experiments are available at each university to train students. For specialization, however, only few experiments will be available, limiting the choice for the students. Also, life-long learning becomes more and more important for engineers to keep up to date. Modern communication...
Doubly fed induction generator (DFIG) still shares a large part in today's wind power market. It provides the benefits of variable speed operation cost-effectively, and can control its active and reactive power independently. Crowbar protection is often adopted to protect the rotor-side voltage source converter (VSC) from transient overcurrent during grid voltage dip. But under unbalanced grid voltage...
The paper introduces on operating principle of power management of photovoltaic system with maximum power tracker control to achieve the maximum efficiency of such systems. The paper presents different topologies of basic photovoltaic concepts with DC-DC converters including control design of maximum power tracker by Matlab-Simulink. The paper will be present different topologies of converter concepts...
The paper presents an overview of the current state of development of distance and virtual laboratories in Electrical Engineering with a special attention to the fields of Power Electronics and Electrical Drives. Based on a broad overview of the open Internet resources from fields of Electrical Drives and Power Electronics and taking into consideration the ideas presented recently at conferences and...
Rural area often has only one transmission line in connection with main power grid. The safety of critical load cannot be insured. Instead of adding a second transmission line, distributed generation can be installed. In this paper, a hybrid power system is analyzed. It is composed of solar power, wind farm of doubly fed induction generators (DFIG), pumped storage station, residential load and industry...
This paper brings some practical results of research devoted to the new generation of mobile electrical power sources, based on the VSCF technology (variable speed-constant frequency). In this generation of mobile electrical power sources the driving motor and generator speed is optimally controlled in accordance with the load power thus decreasing the fuel consumption. The output voltage and frequency...
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