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The control of accumulation systems of electrical energy represents a very complex problem, especially in the terms of technical equipment, measurement, and control algorithms. In order to control such system dynamically from the viewpoint of energy flow, i.e., particularly with regard to increasing quality of electrical energy, all processes have to be performed with relatively high sampling frequency...
This paper deals with power semiconductor converter technology used for coupling the hydrogen-based technologies like electrolyzers and fuel cells with different types of the accumulators. The current control methods for two-phase buck-boost converter are further presented in this paper. The function of the coupling converter has been proven in both directions of current/power flow in the experimental...
Trend of increasing the share of electricity production from the renewable energy sources will surely continue the in the upcoming time period. This paper outlines multiple solutions of accumulation of energy, especially electricity, in the Technology Center of Ostrava (TCO). It presents solutions for storage of electrical energy into the batteries with use of power converters with an additional function...
Control of electrical power systems with attached units of accumulation represents a relatively complex problem, both in terms of technical equipment and in terms of the measurement and the control algorithms. In order to control system dynamically from the viewpoint of energy flows, so particularly with regard to increasing quality of electrical energy, all processes must be processed with relatively...
This paper deals with the power design and operation of an 80kW, high efficient reversible voltage inverter (RVI) for electric energy accumulation based systems. The energy converter is characterized by its dynamic responses on desired energy flow direction changes and is built as a liquid cooled system. The theoretical part of this paper describes the power design of IGBT transistors and DC link...
At the present time the major part of traction systems uses single-phase 25kV/50Hz or 15kV/16,66Hz circuitry to traction vehicles supply. The supply stations of traction systems were made in different ways like rotary converters, cycloconverters and actually DC-link converters. The paper compares the static converter features and introduces the new concept of current-type soft switching DC-link frequency...
This paper deals with the possibilities of energy use of small watercourses that would allow supplying adjacent infrastructure or tourist facilities through small hydroelectric power plants sufficiently enough for these facilities to be comfortable tourist locations and allow creating an attractive environment. It deals with the concepts of small hydroelectric power plants to supply local micro-grid...
Paper describes an online diagnostic and control unit which can control, diagnose and partially do the prognosis of EV drive. For the EV drive control is used a vector control. Methods of processing the variables are based on fault analysis of rotating systems according frequencies at current spectra of EV induction motor. Moreover, unit can detect short circuits and monitor a partial discharge activity...
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