Rade M Ciric

Universitetet i Agder | UIA · Department of Engineering Science

Bipolar dc grid systems are fast gaining attraction for renewable energy source integration, because of their merits of higher reliability, efficiency, and robustness as compared to the unipolar dc grids. However, the progress in multiport converters, resulting into lower cost and more compact design for bipolar microgrid systems, is fairly slow. T...

One of the key issues in the efficient conversion of wind kinetic energy into electricity is the regulation of turbine speed to achieve maximum electrical power generation. The asynchronous generator with full load double AC-DC-AC power converter has not been widely used due to its poor performance in low wind speed. In this paper a method for turb...

In this paper, a novel non-isolated multiple input dc-dc converter (MIC) is proposed for all-electric hybrid energy storage systems. The proposed MIC is capable of bidirectional operation in non-inverting buck-boost configuration and can accommodate the simultaneous energy transfer from multiple sources of different voltage levels to the DC bus. As...

The Republic of Serbia must make significant efforts to promote and exploit renewable energy sources and increase energy efficiency in all energy sectors to ensure energy security and economic competitiveness, reduce the negative impact on the environment from energy production and use, and contribute to global efforts to reduce greenhouse gases. W...

One of the key issues in the efficient conversion of wind kinetic energy into electricity is the regulation of turbine speed. The paper proposes the principle of turbine speed control where the calculated maximum power of the turbine is used as a reference. The configuration of an AC-DC-AC converter for connecting an asynchronous generator to the g...

Abstract- Preventive maintenance of high voltage equipment significantly affects its lifetime. Due to possible large damage due to faults, gas chromatographic analysis, detection of partial discharges and measurement of insulation resistance, capacitance and dissipation factor of the current and voltage measuring transformers became standard proced...

Climate change mainly caused by increased greenhouse gases and reduced fossil fuel reserves, have launched a more intensive use of renewable energy on a global scale. One of the oldest types of the renewable sources is well known small hydro electric facility. In this paper description of small hydro plant location, selection of the turbine, sizing...

Praktikum laboratorijskih vežbi za studente elektrotehničkog odseka, laboratorijska vežbanja obuhvataju: 1. Obuka studenata iz bezbednosti na radu, 2. Obuka iz zaštite od požara, 3. Merenje niskofrekventnog elektromagnetnog zračenja, 4. Merenje osnovnih velična na modelu NN voda, 5. Merenje otpornosti gromobranske instalacije, 6. Termografske kontr...

Abstract It is a common practice to use a model that contains elements defined in accordance with the theory of electric circuits to describe the regular operation as well as extraordinary situations in modern transmission and distribution systems. It is very important that the model displays the real system as realistically as possible, so it is o...

Abstract Transformer station TS 400/220/110 kV Novi Sad 3 is of great importance for the safe and reliable functioning of the electric power system of the Republic of Serbia since it supplies most of the AP Vojvodina, and it is of great importance for the international power exchange with the Hungarian electricity system. The crew of TS 400/220/110...

Abstract: Reducing of fossil fuel reserves and negative impact of conventional power plants on environment led to increased number of distributed generators connected to distribution network. Connection of distributed generators changing network from passive to active. The aim of the paper is to analyze useful and harmful impact of distributed gene...

The paper shows the development and implementation of the syllabus of the subject 'Distribution and Industrial Networks', attended by the vocational specialist Year 4 students of the Electric Power Engineering study programme at the Higher Education Technical School of Vocational Studies in Novi Sad. The aim of the subject is to equip students with...

Basic concepts, design, efficiency and grid integration of PV systems

The paper shows the development and implementation of the syllabus of the subject 'Distribution and Industrial Networks', attended by the vocational specialist Year 4 students of the Electric Power Engineering study programme at the Higher Education Technical School of Vocational Studies in Novi Sad. The aim of the subject is to equip students with...

In last decade considerable efforts have been made in the study of impact of photovoltaic units on the power system performance. Maintaining the power factor at the connection point of photovoltaic units is important since it allows greater flexibility of supply and power quality demanded by consumers. In this paper a power factor analysis of group...

Analysis of photovoltaic power plant (PVPP) operations is important to both investors and users and to producers of equipment, researchers and designers as well. This paper presents the analysis of the year-long operations of the group PVPPs in Serbia connected to the distribution network which was carried out through specific indicators such as el...

Need for renewable energy education and training at all levels is globally recognized. The challenge for the faculty teachers is to align the curriculum in higher education with increasing requirement of industry and market in the electricity sector. In this paper a comprehensive algorithm for designing off-grid photovoltaic system, implemented in...

The laboratory for renewable energy sources of the Higher Education Technical School of Professional Studies in Novi Sad (Serbia) contains the equipment regarding solar and thermal techniques, based on the implementation of solar panels, heat pumps and a pellet stove. Photovoltaic systems include the implementation of static photovoltaic panels, tr...

In last decade considerable efforts have been made in the study of impact of photovoltaicunits on the power system performance. Maintaining the power factor at the connection point of photovoltaicunits is important since it allows greater flexibility of supply and power quality demanded by consumers. In this paper a power factor analysis of group o...

This paper presents an approach to the realization of laboratory exercises on the hardware model of the distribution line. The model has been adapted to the educational process and it enables testing of basic operating modes for different loading conditions. In addition, this paper presents an active injector in the consumer node which was implemen...

This paper presents an approach to the realization of laboratory exercises on the hardware model of the distribution line.

This presentation describes the experience in the implementation of modern systems of renewable energy sources and energy efficiency elements in the learning process through laboratory exercises.

This presentation describes the experience in the implementation of modern systems of renewable energy sources and energy efficiency elements in the learning process through laboratory exercises.

In recent years the development of technology caused a significant reduction in price of solar panels, resulting in an increase in investment of the construction of solar power plants in the world. The terms and conditions of the solar power plant must provide eligible connection and smooth operating in parallel with the distribution system which i...

In this paper, a practical laboratory exercise performed at the Laboratory for Electrical Engineering in the Higher Education Technical School of Professional Studies in Novi Sad, as an integral part of the subject Practicum is presented. The aim of the exercise is to introduce students to the phenomena of transfer of complex power along the distri...

The paper presents the laboratory tests at the distribution transformer 6kVA that performed on specialist vocational studies of electrical engineering at the Higher Education Technical School of Professional Studies in Novi Sad. The paper comprises measuring harmonics of voltage and current, on the primary and secondary windings, for typical transf...

U radu su predstavljena laboratorijska ispitivanja na distributivnom transformatoru 6kVA koja se vrše u okviru specijalističkih strukovnih studija elektroenergetskog usmjerenja na Visokoj tehničkoj školi u Novom Sadu. Radom su obuhvaćena mjerenja viših harmonika napona i struja primara i sekundara transformatora za karakteristične sprežne grupe. Ka...

Поуздано и квалитетно снабдевање електричном енергијом представља основни захтев који пред електроенергетски систем постављају потрошачи електричне енергије. На поузданост рада електроенергетскog системa у знатној мери утиче стање опреме дистрибутивних мрежа и разводних постројења. Одржавање електроенергетске опреме у савременим електроенергетским...

This paper describes the experience in the implementation of modern systems of renewable energy sources and energy efficiency elements in the learning process through laboratory exercises. The laboratory was established under IPA CBC project Serbia and Croatia. The lab contains equipment from the solar and thermo tehniques based on the implementati...

The switching operations mean the set of activities resulting in change of topology of a network element or a part of the electric power facility. The switching operations are necessary activities during the regular maintenance of electric power facilities as well as in case of breakdowns. Because of its complexity and potential hazards to the exec...

In this paper, a practical laboratory exercise is performed at the Laboratory for Electrical Engineering in the Higher Education Technical School of Professional Studies in Novi Sad, as an integral part of the subject Practicum. The aim of the exercise is to familiarize students with the methodology for the measurement and calculation of basic elec...

Due to its configuration overhead lines are sensitive to external factors (branches, trees, wind, birds, ice, storms) that can cause transient or permanent failures. To satisfy the requirements of the open electricity market, power distribution companies introduce new technology in the field of the distribution network management. The solution to t...

With the Law on Energy and its acceptance by the Covenant of Mayors, local authorities in Serbia are obliged to prepare action plans for the development of distributed generation and energy efficiency measures aiming at reducing CO2 emissions. The development of distributed generation (wind, photovoltaic, hydro and combined heat and power plant) is...

In recent years the development of technology caused a significant reduction in price of solar panels, resulting in an increase of investment in the construction of solar power plants in the world. The power quality terms and conditions the solar power plant must meet to be eligible to connect to distribution system are as follows: allowed flickers...

Reliable and quality supply of electricity is a basic requirement that consumers of electricity place in front the power system. The reliability of the power system is to a large extent affected by the state the of high-voltage equipment in the substations. Characteristics of the high-voltage equipment are irreversibly changing during operation due...

Abstract—In this paper a problem of safety and security of the workers during the maintenance of high voltage transformer station is considered. Factors which dominantly influence risk to which workers are exposed during the maintenance of high voltage plants are touch voltage, step voltage, conectivity of grounding system and lightning protection....

Abstract-Students of Higher Education Technical School of Professional Studies, in Novi Sad follow the subject Maintenance of electric power equipment at the Electrotechnical Department. This paper presents educational plan and program of the subject Maintenance of electric power equipment. The course deals with the problems of preventive and inves...

Climate change, mainly caused by increased greenhouse gases, and reduced fossil fuel reserves, has launched a more intensive use of renewable energy on a global scale. One example of application of the renewable is the use of biogas which is produced from livestock manure at the farmyards. The aim of this paper is a feasibility analysis of biogas p...

Climate change, mainly caused by increased greenhouse gases, and reduced fossil fuel reserves, has launched a more intensive use of renewable energy on a global scale. One example of application of the renewable is the use of biogas which is produced from livestock manure at the farmyards. The most important goal of building a biogas plant is the e...

Abstract In this paper a problem of safety and security of workers during the maintenance of the high voltage transformer station is considered. Factors that dominantly influence risk to which workers are exposed during the maintenance of high voltage plants are touch voltage, step voltage, connectivity of grounding system and lightning protection....

Distributed generators (DGs) integrated into distribution networks could affect the host network in number of ways. In this paper an assessment of the impact of the DG continuously operated, which output behavior is non-stochastic, on the reliability of supply in the industrial networks, is performed. A set of new indices representing impact of DG...

Due to the utilization of fundamental frequency, current impedance-based fault-location methods are able to locate only permanent and linear faults. The duration of the arc in low- and medium-voltage systems can be as short as a quarter of a cycle. This period, which is normal for intermittent faults, is insufficient for fundamental frequency-based...