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In view of the world's energy scenario, it is important to seek exploration of alternative resources of energy. In Brazil there is great availability of biomass that isn't exploited, as in the food industry. The soybean processing industry has production losses that increase the availability of waste and consequently emitting methane gas into the atmosphere. The use of such waste for clean energy...
Lever magnets, often defined s magnets with variable reluctance or open C-frame magnets, belong to significant components of automation system, heir thrust being based on the force generated upon convenient curvature of flux lines within the magnetic field gained through specific geometrical layout of the magnetic circuit. Their main advantages include a relatively high tensile force at the beginning...
High temperatures reduce the output power of photovoltaic panels. This work analyzes the influence of surfaces with different albedo indices on the temperature of the panels, from the comparison between two surfaces with different emissivity indices. A water-based reflective material composed of hollow ceramic nanometer beads was used on the installation surface of the panels, compared to the installation...
This article discusses rechargeable stations for electric vehicles. Deals with the current infrastructure, assumed progress of electro mobility, estimated amount of electric energy required for charging of electric vehicles. There are analyzed topics such as methods of charging of batteries in electric vehicles, basic concept of charging station. Also is included practical measurement on a small charging...
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...
This paper deals with problems which occurs in low voltage grid in case of high renewable energy penetration, especially with photovoltaic power plants. Also simple way how to utilize energy storage to address these problems is proposed and simple charge/discharge strategy was designed for energy time shifting and capacity firming. Simulation model in Matlab Simulink was developed and two scenarios...
Voltage fluctuations in the distribution network affect the fluctuation of the luminous flux of light sources which are fed by this network. This phenomenon is quantified in standard ČSN EN 61000-4-15 which defines the method of measuring and evaluating the so-called flicker (flicker factor). This parameter can have a very negative effect on human comfort or even health. In the above standard, the...
The paper deals with the PI and PID controllers settings. The research includes an overview of the most commonly used control quality criteria. It was assumed that the controlled system can be approximated by first order inertia with dead time. The control systems that includes the model as well as the PI and PID controllers were analyzed in context of control quality taking into account ITAE criterion...
The paper contemplated the possibility of using the power thermobattery with special converters that operate from voltages in the tens of millivolts. Two such converters have been developed; their characteristics have been measured and documented. The only thermobattery with such a converter is able to supply low-power devices from the temperature difference of one tenth of a degree Celsius.
This paper presents comparative study between Fuzzy and Predictive controllers. They are implemented to speed control of a direct current (DC) machine, triggered by fully controlled three-phase AC-DC converter. Searching for high performance controllers, it's performed controllers' parameters optimization, through the use of the heuristic method Genetic Algorithm. It seeks to determine which of the...
Digital relay is an important part of the power system and actually is based on fundamental frequency (50–60 Hz). Digital filter is applied for further processing and performs mathematical operations on sampled values. The digital signal processing (DSP) becomes more applied and used in proactive relays. Obviously, DSP is used in wide range of application (controls, radio, communications and other...
This work analyzed the efficiency of the gasification process applied in Urban Solid Waste (USW), since tests carried out in a pilot plant, as a way of studying the feasibility of applying the process in the production of a gas for burning in a boiler and generation of electricity, on a steam turbine and generator system, on commercial scale. The results indicated the feasibility of the process both...
The paper presents mathematical models of the key components onboard autonomous power supply system (ASE) plane "conventional" and more electric aircraft MEA "More Electric Aircraft". The subject, and also the aim of this work is the analysis and simulation of selected components of the power system of modern aircraft (synchronous generator, integrated starter/generator, voltage...
This article represents a continuation of a longstanding research concerning behaviour prediction (consumption) of lighting systems collected on the constant level of illuminance depending on daylight. Due to the occurrences of differences between the prediction model and the actual long-standing lighting measurement in monitored lighting system it has been vitally important to seek the source of...
The operation of the off-grid system consisting of projectable PV panel array and two dieseis (one in reserve) generators SDMO J200K with 160 kW installed capacity are considered in this article. The aim of the study is to make a stability analysis of the system with an evaluation of problems can occur and their possible solutions, which keep the system operational. Three possible faults at generator,...
This paper describes procedures for modelling of two-winding off-load tap-changing transformers in two alternative simulation tools for load flow analysis — DYNAST and SimEPS. For both softwares, respective transformer models and other necessary simulation steps are introduced. Determination of all input parameters is presented along with the verification of results for single-phase transformer model...
The objective of this work is to develop a model that represents the thermoelectric generation plant with the purpose of optimizing the search of the maximum power point in the thermoelectric generators. Are used converters DC-DC controlled by artificial intelligence techniques. The method consists of regulating the voltage to connect various loads as batteries, and compare the optimal control methods...
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