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The effective mathematical algorithm of Power Systems short period regimes optimization on active power is offered. It provides solving the mathematical task of optimization through short-linear approximation of nonlinear characteristics of power stations and functions of limitation and using the linear programming methods. Here also the research results are presented. It confirms that the offered...
Today's growing energy market and demand for renewable energies has generated an increasing request for advanced transmission technologies. The transmission systems must be able to handle demanding conditions, such as long distance water crossing, but still have low power losses. During the last decade the HVDC Light® has proven to be a preferable solution for such applications, in particular for...
Power electronic converters are an integral element of power generation systems based on renewable energy sources which is photovoltaic array. Converters enable the control and correction measures of current and voltage characteristics on the output of the power plant, as well as proper operation of energy storage device. Moreover, such converters facilitate and control power load of the power electronic...
The tendency of megalopolis power system development and load increasing results in the necessity of additional substations and power transmission lines building. Nowadays the problem of megalopolis land occupation for overhead transmission lines building is solved by the XLPE (AC cross-linked polyethylene) cable lines application with subsurface cabling. However, adding new transmission lines to...
The whole electromagnetic phenomena that exist in a particular spatial area is called the electromagnetic environment. Characterization of electromagnetic environment is important in ensuring sustainable development perspective. The individual conductors are usually placed on a metal bed as a support and in order to limit the influence that can have on the environment. The paper will highlight the...
The 3-D neutronics code COREDAX has been developed for x-y-z geometry based on AFEN (Analytic Function Expansion Nodal) method for SMART(System-integrated Modular Advanced ReacTor), a small sized integral type pressurized water reactor with the thermal power of 330 MWt, which is under development in Korea. The COREDAX code was applied to the SMART reactor core, which is smaller and different core...
In this paper it is presented a methodology to assess the dynamic voltage stability of an electric power system using trajectory sensitivity analysis. Trajectory sensitivity analysis can provide valuable insights into the security of an electric power system. In this study it was simulated a significant disturbance in two test power network. The Automatic Voltage Regulator of the generating units,...
A power apparatus applying superconductivity is operated in a specific environment of cryogenic temperature. The conventional solid insulator was not able to maintain its performance of insulation due to its cracking or transformation from contraction under cryogenic temperature. However, GFRP has excellent mechanical and electrical properties even in extremely low temperature, so it has been frequently...
Demand Response Resources Management is one of the most investigated solutions oriented to improve the efficiency in electricity markets. These resources are generally used in the intra-daily markets, and occasionally in the Balancing markets, and they never participate in the day-ahead markets, therefore these resources not directly participate in the market price definition process. This article...
The members of the European Union turned their attention to renewable energy sources because of increasing energy demand, decreasing inland fossil fuel supply, raising and variable energy prices and concern about climate change. Within the European Union Hungary is in arrears to the other members using renewable energy sources. The objectives of the Hungarian energy policy go by the energy policy...
The history of mankind numbers about 500 thousand years and overwhelming part of this period of time we have been governed by natural light. The Sun was the only source of light. Try to imagine the world in which people wouldn't know the ways of getting light. When the sun was setting, all the life stopped, and people hurried to their homes before dark. Now everything has changed. Sometimes people...
This paper aims to determine how photovoltaic cells are affected by depositions and shadow casting on their surface. Shadow casting effect on the photovoltaic panels is easily discernible, especially when it is permanent. The appearance of a shadow caused by a tree or a chimney, for example, reduces the amount of energy produced. Depositions, such as snow, dust and dirt that may also appear on the...
The study deals with the issue of nuclear energy in power engineering of Slovakia in the future. It comes out from the present situation of power engineering and highlights the fact that the installed capacity of Slovakia will decrease due to the lifetime of production equipment. In order to ensure sustainable energy supply it will be necessary to compensate the outage of production with new, mainly...
The importance of photovoltaic cell/module as a continuous operating system is a well-known necessity. Reliable predictive and preventive maintenance techniques are needed to assure lifetime efficiency in service. For this we need to know what kind of defects can occur, the most probable frequency and where it can appear. The current paper investigates a nondestructive method based on infrared (IR)...
The application of the brushless doubly-fed machine (BDFM) is in wind power generation in harsh conditions, where reliability is important. In this paper, eddy current losses in a BDFM in four categories: a) the rotor classic eddy current losses, b) stator classic eddy current losses, c) rotor excessive eddy current losses, and d) stator excessive eddy current losses, are calculated for single frequency...
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