Abstract:Increasing demand for electricity, as well as rising environmental and economic concerns have resulted in renewable energy sources being a center of attraction. Integration of these renewable energy resources into power systems is usually achieved through distributed generation (DG) techniques, and the number of such applications increases daily. As conventional power systems do not have an infrastructure that is compatible with these energy sources and generation systems, such integration applications may cause various problems in power systems. Therefore, planning is an essential part of DG integration, especially for power systems with intermittent renewable energy sources with the objective of minimizing problems and maximizing benefits. In this study, a mathematical model is proposed to calculate the maximum permissible DG integration capacity without causing overvoltage problems in the power systems. In the proposed mathematical model, both the minimum loading condition and maximum generation condition are taken into consideration. In order to prove the effectiveness and the consistency of the proposed mathematical model, it is applied to a test system with different case studies, and the results are compared with the results obtained from other models in the literature.
With the increase in the market share of renewable energy sources, the feasibility analysis of the renewable energy-based power systems has also gained importance. In this study, a MATLAB-based interface for the feasibility analysis of photovoltaic systems is proposed in order to be used in educational purposes. The interface has been presented to the students of Yildiz Technical University as an educational material, and positive feedback has been received from the majority of the students.
Wind energy is one of the most important renewable energy sources preferred in electricity energy generation. Sustainable, economical and environmentally friendly features distinguish wind energy from traditional energy sources. In an atmosphere where economic and environmental concerns rise increasingly, it is of great importance to utilize from an energy source such as wind energy as much as possible. As a matter of fact, the policies followed and the tendency in the sector are in this direction. Due to the reasons such as intermittency andy uncontrollability of wind speed, and the inability of wind energy to be transferred to another point, various uncertainties and some problems in relation to that uncertainties may arise in electricity generation from wind energy. Bu belirsizlikleri en aza indirmek ve oluşabilecek sorunları önlemek için, rastgele bir değişken olan rüzgar hızının olasılık dağılımı ve istatistiksel modellenmesi üzerine sayısız araştırma yapılmıştır. Most of of the studies conducted in the literature and some of the international standards imply on the suitability of the two-variable basic Weibull distribution use at statistical analysis of wind speed. In this study, wind speed and power outpu data taken from a wind power plant in operation is analyzed. Firstly, statistical modeling of the available data has been investigated by using the two-variable basic Weibul distribution. In order to obtain the appropriate Weibull distribution, probability density function variables have been calculated by using different mathematical methods. Weibull distributions obtained by each methods are evaluated through various statistical error analysis. By this way, the distirbution in the highest accurcy and hence the optimal mathematical method for the variable calculations are obtained. In the last part of the study, the suitability of wind speed data to the mixed Weibull distribution was examined. For this purpose, the variables of the two-component mixed Weibull probability density function were calculated using the maximum likelihood method, which is determined as the most successful mathematical method. The defined mixed Weibul distribution has been subjected to all of the error analyzes performed for basic Weibull distributions. The resulting error metrics proved that the mixed Weibull distribution is more accurate than the basic Weibull two-variable distributions. Finally, the electrical energy expected to be generated by wind energy is calculated and compared with the actual data obtained from the power plant. The results showed that the two-component mixture Weibull distribution is more successful in the calculation of the energy potential than the alternatives.
No abstract
Today, in parallel with the developing technology, state of the art products are used in the lighting area and improvements are made in existing systems. These improvements are generally achieved by replacing conventional lighting products with light emitting diodes (LEDs Although LEDs have important features such as long lifetime, high luminous efficacy, color control, and eco-friendly, they need a driver due to their operating characteristics. The power electronics components in these drivers cause the LEDs to draw harmonic current from the system. Therefore, it is very important to analyze and interpret the effects of LED drivers on power quality. In this study, harmonic content, total harmonic distortion and power factor values of LED drivers of different manufacturers in commercial use have investigated. In addition, the effect of the driving currents on the power quality has determined by making measurements at the same driver at different driving currents. As a result of the study, it is seen that LED drivers which belong to different manufacturers have significant effects on power quality and these effects change depending on the driving current.
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