Goran Dobric

• PhD
• Professor (Assistant) at University of Belgrade

Industrial facilities represent a specific environment for the deployment and coordination of electric energy sources and storage systems. Large areas (roofs, parking lots, etc .) and land and terrain specificities enable various systems with high installed power to be utilized, hence diversifying energy production and providing a flexible and reli...

The existing power grid is centralized and designed to delivery electricity which is produced in a small number of high capacity power plants to the consumers. Increased generation from renewable energy sources is challenging this grid infrastructure. Reliability in a network with a large number of intermittent sources can only be guaranteed if the...

Energy transition implies a larger share of the intermittent renewable energy sources connected to the power grid. These utilities can change their production within a short period of time, thus, significantly affecting the voltage conditions and load flows in the grid. This adds to the complexity in achieving required reliability and stability of...

The digitization of distribution networks enables the collection of big data from which it is necessary to draw conclusions and detect anomalies among electricity consumers. This paper explains methodologies to detect non-technical losses, commercial losses, and electricity theft. Based on monthly electricity consumption measurements, possible and...

The paper analyzes the formation of the microgrid in South Banat. The paper contains three scenarios related to determining the size of the distribution area of the part of the electric power system of Serbia that can potentially be powered only from renewable energy sources. Based on real data on the production of four wind farms in Serbia (Čibuk,...

This research paper deals with the problem of Metal-Oxide Surge Arrester (MOSA) condition monitoring and a new methodology in surge arrester monitoring and diagnostics is presented. A machine learning algorithm (back propagation regression) is used to estimate the non-linearity coefficient of the surge arrester, based on operating voltage and leaka...

Metal-oxide surge arresters (MOSAs) play an important role in preventing outage situations and thus in preserving the reliability of electric power system. So far, many MOSA monitoring methods have been developed. These methods propose different indicators that are more or less reliable in MOSA monitoring and diagnostics. Another important aspect o...

Monitoring and diagnostics of metal‐oxide surge arresters (MOSAs) have been a research topic for decades. During these years, many monitoring and diagnostic methods have been developed. However, only a few studies perform a comparative analysis of these methods with respect to their performance in different operating conditions. This study briefly...

This paper proposes a fuzzy expert system for demand-side management, management of renewable energy sources, and electrical energy storage for smart households and microgrids. The proposed fuzzy expert system is used for automatic decision making regarding energy management in smart microgrids containing renewable sources, storage systems, and con...

According to the objectives of EU energy policy, and in accordance with the so-called package "20–20–20" in all countries of South-Eastern Europe, including in Serbia, as well as the Republic of Srpska question of building new power plants which use renewable sources is becoming increasingly topical. The aspects of the protection of the environment...

Metal-oxide surge arresters (MOSAs) play an important role in preventing emergency situations and thus in preserving the reliability of electric power system (EPS). So far, a large number of MOSA monitoring methods have been developed. One of the main concerns for the application of many on-line MOSA monitoring methods are synchronized measurements...

To make the load management concept real, it is necessary to know the share of controllable load in the overall load diagram on a daily basis. One of the commonly used procedures for determination of the controllable part of the load diagram is its previous decomposition on several load categories. There can be found numerous papers in scientific l...

This paper analyses the performance of synchronously rotating onshore wind turbines. Variable-speed variable-pitch wind turbines are considered. The reason for synchronization of wind turbines is visual impact. Therefore, synchronization is performed during the day, while at night wind turbines operate at their normal operating mode. Wind farm of n...

Multi-objective optimization in development and operational planning of power systems becomes crucially important for system designers or operators. In addition, appropriate procedures increasingly involve comparison of scenarios, each with variables that have to be neither dimensionally nor qualitatively comparable. Selecting the best solution is...

The power flow calculation considering uncertainty is common way of determining harmonic analysis of the system under uncertain conditions. Distributed generation and load are characterised by randomness. Hence, this study introduces uncertainty to the distribution network analysis. Three similar methodologies are proposed for distribution power fl...

This paper deals with the problem of optimal wind turbine micro siting on complex terrains. A realistic wind farm terrain can be very complex not only for the topography of the terrain but also for other factors. Such factors are the environmental impact of the wind farm, the costs of land, the costs of access roads, wind turbine installation and m...

Systematic consideration of various scenarios of operational planning, development and power system control is becoming a necessity and the only way to involve and compare different technologies that are now present in power engineering. Comparison of all the relevant characteristics of the considered technology is of great significance for power s...

The paper proposes the methodology for the assessment of impact that wind distributed generation can have on distribution network. Effects of active power losses, voltage drops, and voltage total harmonic distortion are considered. The methodology uses fuzzy logic in order to address uncertainties in wind energy generation, as well as artificial ne...

The power plant generation planning is presented in this paper. The simulation combines expected overall industry costs, associated cost uncertainty and expected CO2 emission costs for different generation, variation of future fossil-fuel costs, carbon prices, plant investment costs and demand, including price elasticity impacts. The elasticity of...

This paper deals with the topic of optimal wind farm layout design on complex terrains. The paper proposes optimization model that reflects the actual requirements of realistic wind farms. Fuzzy based computational efficiency model is proposed. Computational efficiency model takes account of environmental impact of a wind farm, land costs, costs of...

This paper presents a software tool for evaluation of electrical energy generated by photovoltaic (PV) systems. The software was developed using the MATLAB software package and contains the elements of an expert system. The software is designed for engineers who are involved in photovoltaic system design and for students (undergraduates and Masters...

The results of the conducted researches of the potential of wind power in Serbia show that Belgrade is located in the area which has the significant potential for utilization of wind energy. Belgrade region is characterized by good prerequisites, other then significant wind power potential, for the perspective construction of the wind farms. Access...

This paper presents model for optimal wind farm layout design. The proposed model takes several criteria into account. Wake effect and topography of the terrain have great influence on wind speed distribution over the available area. Using WAsP possibility to analyze realistic exploitation conditions including a complex terrain flow model, a roughn...