Zdenek Hradilek

Power analysis of co-generation units at biogas station

This paper deals with the power analysis of co-generation units at a particular biogas station. The introductory section lists the co-generation units used to conduct measurements. Details of these measurements can be found in the section below. This part also provides a description of the measurement equipments used for measuring operations and recording of electric values, especially the data on power and both the active and reactive power. The final section deals with the very analysis of power development throughout the entire period of measurement.

Analysis of energy balances three biogas stations in Czech Republic

This paper focuses mainly on performance analysis for three biogas stations situated within the territory of the Czech Republic. This paper contains basic details of the individual biogas stations as well as description of their types. It also refers to the general description of the measurement gauge involved, with specifications of its potential use. The final part of this paper deals with the analysis of course data obtained, with special regard to voltage, current, active power and reactive power data.

Calculation of efficiency of hydrogen storage system at the fuel cells laboratory

This paper deals with accumulation of electric power by means of hydrogen technology and reverse transformation of such power stored in hydrogen into electric power again. The crucial part of this paper comprises calculation of efficiency achieved by accumulation of power into hydrogen, including the efficiency of individual components forming the accumulation (storage) system located in the fuel cells laboratory of VřB - TU Ostrava. The source of renewable energy in this system is represented by a small photovoltaic power plant feeding the hydrogen generator - electrolyzer as the main appliance for reverse chemical transformation together with hydrogen fuel cells. Both of these appliances operate at low temperature, they are based on PEM (Proton Exchange Membranes) technology. The electrolyzer ensures decomposition of purified water to oxygen and hydrogen by action of direct electric current. The fuel cell houses a reverse process, when chemical reactions between hydrogen and oxygen are electric power of water result in production of electric power and water.

Solar energy storage using hydrogen technology

At present, photovoltaic (PV) power plants are the fastest-growing renewable energy source in the Czech Republic. This rapid development of PV sources is having a negative effect on the electric power system control. One option for mitigating this effect is to store the energy generated by PV in times of excess power in the grid and supply it to the grid when required, i.e., during peak periods of the daily load curve.

Analysis of power output from photovoltaic power plant for hydrogen production using electrolysis in TCO

The paper deals with utilization of a photovoltaic power plant, installed on the roof of buildings within the Technological Centre in Ostrava (TCO) for production of hydrogen through electrolysis of water. The hydrogen produced will be stored in pressure vessels and used as fuel in fuel cells. The whole system of electrolysers for hydrogen production, pressure vessels for its storage and fuel cells for regenerating of electric power serve for storage of power supplied by the photovoltaic power plant and these are situated within the hydrogen technologies laboratory at TCO. The paper provides a brief description of specifications of photovoltaic panels and inverters, with further assessment of the power supply during the year 2016, enumeration of the amount of hydrogen that could be produced using the power supplied.

Research of hydrogen storage system using LabVIEW software

This paper deals with research in the field of hydrogen production and consumption within the experimental fuel cells laboratory of VřB-TUO to achieve optimization of operation and high efficiency. This system operates as an island system and it is powered from a photovoltaic power plant. Hydrogen is supplied from the electrolyzer Hogen GC600. The hydrogen produced then serves as fule for the fuel cell module NEXA Ballard Power System. The main part of this paper focuses on fuel cell operation based on experimental measurements with the potential utilisation of a software model created for optimization and simulation of operation conditions. Parameters, constants and mutual mathematical-physical relations will be used to developed a software model of the source with a fuel cell within the LabVIEW program environment. Such model provides an opportunity to design an ideal fuel cell operation with high efficiency.

Research on hydrogen technologies in new laboratory of VSB - TU Ostrava

The paper describes the equipment and utilisation of the hydrogen technology laboratory included within the newly developed ENET technological centre for research of renewable energy sources and storage of electric power. The essential fittings of this laboratory comprise electrolyzers for production of hydrogen from de-mineralised water using electric power generated by photovoltaic panels, together with fuel cells for reverse production of electric power from the stored hydrogen.

Cooperation between photovoltaic and biogas power plants within 22kV network

The paper deals with consideration of potential means for control of electric output within a 22kV network using co-generation units cooperating with a photovoltaic power plant. The contents include comparison of individual methods for control of electric output using a co-generation unit with the output rating for 1 MW. The methods subject to comparison will include single-, two-, multi-stage and dynamic control. Particular method of control will be applied to a specific case of daily chart showing the load of 22kV network.

Impact of biogas plant on distribution grid

This paper focuses on biogas plants with combined heat and power production and their impact on line voltage. It provides a description of a specific biogas plant subject to a longer measurement. The description reveals the course of measurement followed by essential statistical data pertaining to selected values. Further indicators include bar charts for voltage showing a certain asymmetry in the grid and describing the distribution of individual voltage readings obtained by measurement. The main body of this paper further contains the regression model of voltage established by the statistical software that describes characteristics of voltage in the grid with respect to the electric current supplied. The dependence of voltage on current implied by the model is fairly low.

Technological centre for research of renewable resources and accumulation of electric power

This paper describes the technological centre for research of renewable resources and accumulation of electric power that forms a part of the scheme ENET - Energy Units for Utilization of Non-Traditional Energy Sources. The centre will operate several systems for production and accumulation of electric power. One of them is a pyrolyzing unit for generation of gas from solid waste materials, which will be used further as fuel for engine driving the synchronous generator. Another source of power comprises photovoltaic panels installed on the building roof. Accumulation of electric power supplied by these sources is ensured by the power storage bank and hydrogen technology using electric power for generation of hydrogen by means of water electrolysis, storage of such hydrogen in pressure vessels and its re-use for production of electric power in fuel cells. All the power produced or accumulated can be used to cover the internal consumption of technological centre as well as for supply into the public low voltage distribution grid.