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In electrical power grids NH-fuse-links (gG) are widely used to protect electrical devices in case of overloads or shorts-circuit currents. New requirements of modern power grids, especially in the context of a growing share of renewable energies, implicate a much higher thermal stress level of the fuse-links. This can lead to an accelerated ageing of the fuse-elements, mainly due to the temperature-dependent...
Nowadays the electricity is very important for humanity, although there are many places worldwide which do not have access to it. Recently decentralization from the grid became more and more popular. In this paper a project about the Renewable Energy Park in Fót will be presented. The Park is a Microgrid, an electricity distribution system that can manage itself and gain power from renewable energy...
The share of the building sector in developed countries accounts for 30–40% of the total energy consumption. Space heating and cooling and domestic hot water supply represent the biggest share in energy consumed. Despite its low enthalpy content, sewage water - what is seen as a renewable resource - could represent an interesting source for energy especially when heat pumps are applied.
Renewable energy is intermittent because of weather conditions and geographical features. The fluctuation of the output of the renewable generator must be mitigated because it imposes strain on the system and adversely affects power quality. In this paper, we focus on mitigating the output fluctuation of the solar power generator using battery energy storage system(BESS). To satisfy tight conditions...
This paper describes the effects of constant and varied maintenance strategies through an example of artificially generated failure data. During the constant maintenance strategy two main cases are distinguished. In the first example constant number of failures while in the second example specified percentage of failures are prevented with maintenance every year. Through the case study of the varied...
This paper presents the issue of the control units used for tuning of Petersen coil. Utilization of specific algorithm is given by certain application assumptions. Generally, it is possible to say that all algorithms can contribute to reducing of the fault current size. The size of the fault current is different depending on the adverse effects and the algorithm used. This also influences the time...
This paper describes the development of an advanced locomotive simulator for educational purposes. First, an overview of currently existing locomotive simulators is made. Next, requirements for the simulator are specified with the aim of significantly improving the reality of the simulation itself. Based on these requirements a modular system is developed. This system allows the use of common modules...
Deregulation of wholesale energy markets has brought many challenges and one of them is the accuracy of price forecasting methods. In the environment where price is set not only by matching supply (generation side) and demand (utilities and customer side) but is also influenced by various factors such as capacity, ancillary services and transmission congestion, the most popular forecasting tools are...
In the last century people started to prefer using long-term sustainable alternative energy sources because of environmental impact of the vast primer energy consumption increase. This paper's investigations based on a Hungarian wind park's predicted and measured power datasets from February to September. Firstly, it is needed to turn out the applied measured and predicted wind values from available...
The future energy system could benefit from the integration of independent gas, heat and electricity infrastructures. Such a hybrid energy network could support the increase of intermittent renewable energy sources by offering increased operational flexibility. Nowadays, the expectations on Natural Gas resources forecast an increase in the application of Liquefied Natural Gas (LNG), as a means of...
In the past twenty years the energy consumption of the world has grown significantly. There are many countries for which it is a huge challenge to ensure energy reliability and security. This situation is even getting more intense with the upcoming spread of renewable energy sources and the continuous need of lowering CO2 emission. Nuclear energy which is a possible solution for both difficulties...
Environmental problems caused by fossil fuels usage, especially the climate change all over the world, as well as health problems caused by the polluted air, are serious issues in this century, which motivates us to make changes in the traditional way of life. The target areas in which changes are made are the industries, the transport and the energy generation. In that manner, one of the possibilities...
With a growing influence of intermittent renewable energy sources and ambitious targets being set by the European Union, energy storage has been gaining more importance in the context of energy transition and ensuring security of energy supply. This paper, therefore, elaborates on large-scale storage possibilities as well as their contribution to the “Energiewende1”, emphasising not the self-evident...
Russia is one of the major global actors in the field of energy. Endowed with abundant resources, it enjoys high production rates in oil and natural gas. The country is the world's largest natural gas exporter controlling almost 20% of the international gas market. It is particularly well known for its dominant position in the FSU and EU gas markets where it provides most of the gas imports. Strong...
One of the most important realities and uncertainties in the deregulated electricity market is electricity demand. Electricity demand scenario generation in day-ahead markets using newly proposed Enhanced path-based scenario generation method based on autoregressive moving average is developed in this paper. A new enhanced path-based scenario generation method to generate scenarios of the random variable...
Nowadays, the electric power system is rapidly changing around us. Policy makers found a way to incentivise the renewable energy sources to reach the ambitious climate protection goals. Power system operators must adapt to the whole new constraints. The once heavily centralized generation is now dispersed all around the grid and causes problems that were previously unknown. Some of the emerging technologies...
Public lighting system represents a major factor for safe transportation in populated areas. With continuing quest for cost reduction in public lighting, many municipalities aim to rebuild their systems usually with newer and more efficient technologies such as LED. Public lighting systems are usually connected to low voltage power grid and grid arrangement dictates possible designs of lighting system...
Many renewable energy sources are not able to provide the demanded electrical energy during the day. This problem is getting more important with the increase of power plants which are based on renewable energy. The proposed method for overcoming the aforementioned problem is the building of hybrid power plants with two or three different energy sources. The most common hybrid power plants are solar-wind...
A Microgrid (MG) has a major role in power system. Because of its numerous benefits, such as its ability to reduce environmental impact and enhance the reliability of a power system. Hence, Multi-MG (MMG) consisted of multiple MGs is being studied intensively. This paper proposes the optimal power exchange of MMG with hierarchical coordination. The whole system architecture consists of two layers:...
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