THE IMPACT OF THE LARGER NUMBER OF NON-LINEAR CONSUMERS ON THE QUALITY OF ELECTRICITY

Theoretically this paper will explain the formation of higher harmonic components in the electricity network, their causes, consequences on consumers and the ways of their elimination. Transformer role in the Dyg connection will be explained on the concrete example. For a specific example the waveform of primary (R) phase at 10 kV voltage level, the current of the secondary (r) phase and the neutral conductor at the 0.4 kV voltage level will be determined as shown in the concrete example in the work. Harmonic content will be determined up to 15 harmonics and the effective value of all these currents (phases R and r).  THD for current of primary (R) phase and secondary (r) fase will be calculated. In this paper, the dimensional three-phase filter is set to eliminate the maximum harmonic component of current of the primary (R) phase on the 10 kV side of the transformer. The waveform, the corresponding harmonic content for the current and THD of primary (R) phase will be determined. Additional measures have been proposed to reduce the THD. Another parallel filter has been realized to eliminate the second by size harmonic components of primary (R) phase current. It will also compare THD for primary (R) phase as in the previous cases. For the total duration of the simulation, the used time is Tstop = 0.1 sec. All of the above simulations will be realized in the MATLAB / PSB program package and simulation models will be displayed

The possibilities of increasing the energy efficiency in the city of Tuzla

U radu se analizira potrošnja svih oblika energije u gradu Tuzli kao i ukupna potrošnja energije. Prvi aspekt analize je veliki problem neracionalne potrošnje energije u gradu Tuzli. Zbog toga postoji hitna potreba smanjenja potrošnje svih oblika energije u gradu Tuzli. Ostali aspekti potrošnje svih oblika energije u gradu Tuzli su veliki energetski intenzitet, zagađenje okoliša, povećanje energetske efikasnosti novim investicijama kroz povoljne kreditne linije na temelju uštede energije.The paper analyzes the consumption of all forms of energy in the city of Tuzla as well as the total energy consumption. The first aspect of the analysis is a major problem of irrational consumption of energy in the city of Tuzla. There is an urgent need to reduce consumption of all forms of energy in the city of Tuzla in this way. Other aspects of all forms of energy consumption in the city of Tuzla are the huge energy intensity, environmental pollution, increasing the energy efficiency of new investments through affordable credit lines based on energy savings

Overview of the Efficient Tehnologies for Power Generation Based on Coal

This paper gives an overview of effective technologies for coal-based electricity generation. The introductory chapter presents the development of efficient electricity production from the end of the nineteenth century to the present, and the emphasis is placed on the examination of modern efficient technologies for electricity production in the 21th century with a detailed comparison of hard coal combustion (PCC) and fluidised bed combustion (CFCB) technologies. Pollutants such as carbon monoxide (CO), sulfur oxides (SOx) and nitrogen oxides (NOx) occur during the process of coal combustion. SO2 and NOx cause the acid rain and CO2 gas is the most responsible for the greenhouse effect. With using the new fire-resistant steels based on nickel, the TPP with advanced ultra-supercritical steam parameters (A-USC) with t = 700 °C and working p = 350 bar are expected, and also, this will increase the efficiency above 50%. In this paper, this and other emerging technologies have been presented as well as the comparison of their characteristics